JP6385704B2 - burner - Google Patents

Description

  The technology of the present disclosure relates to a premixing type burner in which a mixture of fuel and air is supplied to a combustion chamber.

  Conventionally, a diesel particulate filter (DPF: Diesel Particulate Filter) that captures particulates (PM) contained in exhaust gas is disposed in an exhaust passage of a diesel engine. In such a DPF, a regeneration process is performed in which the particulates captured by the DPF are incinerated using exhaust gas in order to maintain the particulate capturing function.

  For example, in the exhaust emission control device of Patent Document 1, a burner is disposed in front of the DPF, and combustion gas is generated by burning a mixture of fuel and air in the combustion chamber of this burner. The exhaust gas flowing into the DPF is heated by supplying combustion gas to the exhaust gas in the exhaust passage.

  Further, as such a burner, in order to improve the ignitability and combustibility of the air-fuel mixture and reduce the unburned fuel contained in the combustion gas, the vaporized fuel is not supplied to the combustion chamber separately. There is also known a premixing type burner for supplying an air-fuel mixture to a combustion chamber.

JP 2011-185493 A

By the way, in the above-mentioned premixing type burner, the temperature of the air used to generate the air-fuel mixture may be lower than the temperature of the vaporized fuel. When the temperature of the air is lower than the temperature of the vaporized fuel, the temperature of the vaporized fuel is lowered when the vaporized fuel and air are mixed, and a part of the vaporized fuel is liquefied. The liquefied fuel adheres to the inner wall of the premixing chamber where the vaporized fuel and air are mixed. As a result, the amount of fuel that is not used for combustion increases, resulting in a decrease in ignitability and combustibility of the air-fuel mixture, waste of fuel, and the like.
An object of the technology of the present disclosure is to provide a burner capable of effectively using fuel.

  A burner that solves the above problems includes a first cylinder portion having an outlet at the end of a cylinder from which a combustion gas combusting an air-fuel mixture is burned, and a vertical direction in the first cylinder portion toward the outlet. And a second cylinder portion extending in a direction different from the second cylinder portion, wherein the second cylinder portion has a closing portion that closes the cylinder end located on the ejection port side among the cylinder ends of the second cylinder portion. And a wall portion connecting the inner surface of the first tube portion and the outer surface of the second tube portion, and the first tube is formed by the second tube portion and the wall portion. A space inside the section is divided into a premixing chamber and a combustion chamber which is a space closer to the ejection port than the premixing chamber, and a communication passage is formed to communicate the premixing chamber and the combustion chamber. And a glow plug having an ignition part disposed on the lower side in the vertical direction with respect to the second tube part in the combustion chamber, A storage part disposed in the combustion chamber and capable of holding liquid fuel in a vaporizable manner, wherein the storage part has a part of the outer surface of the second cylindrical part located above the storage part in the vertical direction; And a passage connecting the premixing chamber and the storage portion is formed in at least one of the second cylindrical portion and the wall portion.

  At least a part of the fuel liquefied in the premixing chamber goes out of the premixing chamber through the passage and is held in the reservoir. When the burner is started again with the fuel held in the reservoir, the fuel held in the reservoir contributes to combustion by receiving heat from the ignition part of the glow plug. Therefore, the fuel can be used effectively.

  The said burner WHEREIN: The said channel | path is formed in each of the said 2nd cylinder part and the said wall part, The said channel | path which the said 2nd cylinder part has, and the said channel | path which the said wall part has are connected. It is preferable.

  According to the said structure, since the channel | path which a 2nd cylinder part has, and the channel | path which a wall part has are connected, the liquefied fuel tends to enter a channel | path. Therefore, the fuel liquefied in the premixing chamber is easily guided to the storage part.

  In the burner, the storage section is a first storage section, provided in a portion facing the premixing chamber in the second cylindrical section and the closing section, and is capable of holding liquid fuel in a vaporizable manner. It is preferable to further include two storage units.

  According to the above configuration, at least a part of the fuel liquefied in the premixing chamber is held in the second reservoir. When combustion of the air-fuel mixture is started by the burner, the heat of the flame is transmitted to the second reservoir, and as a result, the fuel held in the second reservoir is vaporized and mixed with the air-fuel mixture and used for combustion. . Therefore, the fuel can be used effectively.

  In the burner, the glow plug includes a plug storage portion that is disposed around the ignition portion and that can hold liquid fuel in a vaporizable manner, and the burner is configured to store the plug from the outside of the first tube portion. It is preferable to further include a supply unit that supplies fuel to the unit.

  According to the above configuration, the fuel held in the plug reservoir directly receives heat from the glow plug, and the generated flame contributes to the ignition of the air-fuel mixture. Therefore, the ignitability of the air-fuel mixture is further improved.

  The burner controls the temperature of the ignition part of the glow plug before the fuel is supplied to the premixing chamber, and causes the supply part to supply fuel to the plug storage part. It is preferable to further comprise. According to the above configuration, since the generation of the flame based on the fuel held by the plug storage unit is performed prior to the ignition of the air-fuel mixture that has passed through the communication path, the ignitability of the air-fuel mixture is further improved.

  According to the technique of the present disclosure, the fuel can be effectively used in the burner.

It is a schematic block diagram which shows schematic structure of 1st Embodiment of the burner in this indication. It is sectional drawing which shows the cross-section of the 2-2 line in FIG. 1, Comprising: The arrow in FIG. 2 shows the flow of the combustion air. FIG. 3 is a cross-sectional view showing a cross-sectional structure taken along line 3-3 in FIG. 1, with the wire net omitted, and the arrows in FIG. 3 indicate the flow of combustion air. It is a figure which expands and shows a part of burner in 1st Embodiment. It is a schematic block diagram which shows schematic structure of 2nd Embodiment of the burner in this indication. It is a figure which expands and shows a part of burner in a modification. It is a figure which expands and shows a part of burner in a modification.

(First embodiment)
A first embodiment of the burner will be described with reference to FIGS. First, the overall structure of the burner will be described with reference to FIGS.

  As shown in FIG. 1, a diesel particulate filter (DPF) 12 that adsorbs particulates contained in the exhaust is mounted in the exhaust passage 11 of the diesel engine 10. A burner 20 that performs regeneration processing of the DPF 12 by increasing the temperature of the exhaust gas flowing into the DPF 12 is mounted on the front stage of the DPF 12.

  A first cylindrical portion 30 having a cylindrical shape is fixed to the substrate 21 of the burner 20, a second cylindrical portion 50 having a cylindrical shape is located inside the cylindrical portion 30, and further inside the cylindrical portion 50. A cylindrical tube portion 40 is located. Of the two cylindrical ends of the cylindrical portion 30, the cylindrical end on the proximal end side is closed by the substrate 21, and an annular ejection plate that defines an ejection port 32 through which combustion gas blows out is formed at the distal end of the cylindrical portion 30. 31 is fixed.

  Of the two cylindrical ends of the cylindrical portion 50, the outer surface 50b of the cylindrical end on the side of the substrate 21 is fixed to the inner side surface 30a of the cylindrical portion 30 via an annular burner head 55 which is an example of a wall portion. The cylinder end on the side of the spigot 32 is closed by a closing part 51. By the burner head 55, the cylinder part 50, and the closing part 51, the space in the cylinder part 30 is divided into a combustion chamber 77 that is a space on the ejection port 32 side and a premixing chamber 70 that is a space on the substrate 21 side. It has been. The burner head 55 is formed with a plurality of communication passages 56 that allow the combustion chamber 77 and the premixing chamber 70 to communicate with each other. A wire mesh 57 that covers the plurality of communication passages 56 is attached to a side surface of the burner head 55 that faces the combustion chamber 77.

  Of the two cylindrical ends of the cylindrical portion 40, the outer surface 40 b of the cylindrical end on the substrate 21 side is fixed to the inner side surface 30 a of the cylindrical portion 30 by the annular connecting wall portion 41, and the cylindrical end on the ejection port 32 side. Is open. The connecting wall portion 41 is fixed to the inner side surface 30 a of the cylindrical portion 30 at a position closer to the substrate 21 than the burner head 55. The cylindrical portion 40 and the connecting wall portion 41 define a flow path through which the air-fuel mixture passes in the premixing chamber 70.

  The cylindrical portion 30 has an extending portion 33 that extends toward a substrate 21 from a portion connected to the connecting wall portion 41 in the cylindrical portion 30. In the extending portion 33, introduction ports 34 for introducing combustion air into the premixing chamber 70 are formed at predetermined intervals along the circumferential direction. A cut-and-raised piece 35 that generates a swirling flow of combustion air in the premixing chamber 70 is formed at the opening edge of the introduction port 34 by guiding the combustion air flowing into the premixing chamber 70 through the introduction port 34. (See FIG. 2). Further, a plurality of inlets 36 for introducing combustion air into the combustion chamber 77 are formed in a portion surrounding the combustion chamber 77 in the cylindrical portion 30.

  The burner 20 is substantially parallel to the horizontal direction in which the axial direction of the cylindrical portions 30, 40, 50 is parallel to the ground surface, and the radial direction of the cylindrical portions 30, 40, 50 is substantially parallel to the vertical direction. Arranged to be. In the combustion chamber 77, a fuel storage portion 80, which is a first storage portion, is disposed on the lower side in the vertical direction with respect to the center line of the cylindrical portion 50 in the outer surface 50 b of the cylindrical portion 50. In other words, the fuel storage portion 80 is disposed outside the cylindrical portion 50 and at a position directly below the center line of the cylindrical portion 50. In addition, the center line of the cylinder part 50 is a central axis of the cylinder which the cylinder part 50 has. The fuel storage unit 80 is also in contact with the side surface of the burner head 55 via the wire mesh 57.

  An ignition portion 62 of the glow plug 61 is located on the side of the ejection port 32 with respect to the burner head 55 and below the center line of the cylinder portion 50 in the vertical direction. The glow plug 61 is fixed to a cylindrical tube portion 60 into which the tube portion 30 is inserted. The ignition part 62 is located in the cylinder part 30 through a through hole formed in the cylinder part 60 and the cylinder part 30. The ignition unit 62 is in contact with the fuel storage unit 80.

  Of the two cylindrical ends of the cylindrical portion 60, the cylindrical end on the proximal end side is blocked by the substrate 21, and the cylindrical end on the distal end side is blocked by the annular blocking plate 63 in the gap between the cylindrical portion 60 and the cylindrical portion 50. Has been. The downstream end of the air supply passage 64 is connected to the cylindrical portion 60 at the end on the ejection port 32 side. The upstream end of the air supply passage 64 is connected to the intake passage 13 of the diesel engine 10 and downstream of the compressor 15 that rotates together with the turbine 14 disposed in the exhaust passage 11.

  An air valve 65 is disposed in the air supply passage 64. When the air valve 65 is in the open state, a part of the intake air flowing through the intake passage 13 flows into the air circulation chamber 67 in the gap between the tubular portion 30 and the tubular portion 60 as combustion air through the air supply passage 64. In the vicinity of the outlet of the air supply passage 64, a guide portion 68 is provided for guiding the combustion air so that the combustion air flowing in the air circulation chamber 67 turns into a swirling flow swirling around the cylindrical portion 50 ( (See FIG. 3). The combustion air is supplied to the combustion chamber 77 through the plurality of inlets 36 and is introduced into the premixing chamber 70 through the plurality of inlets 34.

An injection nozzle 90 is fixed at the center of the substrate 21. A part of the fuel in the fuel tank 92 is fed into the injection nozzle 90 through the fuel supply passage 91. A fuel pump 93, a first fuel valve 94, an electric heater 95, and various sensors that detect the pressure and temperature of the fuel flowing through the fuel supply passage 91 are attached to the fuel supply passage 91. The electric heater 95 heats and vaporizes the fuel flowing through the fuel supply passage 91 at a flow rate according to the control of opening and closing of the first fuel valve 94, and the injection nozzle 90 causes the vaporized fuel fed from the electric heater 95 to be premixed. 70 is injected.
Opening / closing of the air valve 65, opening / closing of the first fuel valve 94, ON / OFF of the electric heater 95, and driving of the glow plug 61 are controlled by a control device 97 as a control unit.

The mixture of the vaporized fuel injected from the injection nozzle 90 and the combustion air introduced into the premixing chamber 70 through the plurality of inlets 34 flows through the cylinder portion 40 toward the outlet 32 and then turns. Then, it flows toward the substrate 21 through the space between the cylinder part 40 and the cylinder part 50. Thereafter, the air-fuel mixture is rotated again and flows into the combustion chamber 77 through the communication passage 56 of the burner head 55. The air-fuel mixture that has flowed into the combustion chamber 77 is ignited by the ignition unit 62, so that the combustion chamber 77 generates the flame F that is the air-fuel mixture during combustion and the combustion gas accompanying the flame F is generated. Is done. By mixing the flow path of the air-fuel mixture in the premixing chamber 70, the mixing of the air-fuel mixture is promoted.
Next, the structure around the fuel storage unit 80 will be described in detail with reference to FIG.

  As shown in FIG. 4, the tubular portion 50 is formed with an outlet 52 that communicates the inside and the outside of the tubular portion 50 on the lower side in the vertical direction with respect to the center line of the tubular portion 50. The outflow port 52 reaches the cylinder end on the substrate 21 side of the cylinder part 50 and cuts out the cylinder part 50. In the burner head 55, an outlet 58 is formed on the lower side in the vertical direction with respect to the center line of the cylindrical portion 50, and communicates the space defined by the burner head 55. The outlet 58 reaches the inner edge of the burner head 55, cuts out the burner head 55, and is connected to the outlet 52. That is, the outflow port 52 and the outflow port 58 are formed at positions that are directly below the center line of the cylindrical portion 50. The position of the wire mesh 57 facing the outlet 58 is cut out.

The outflow port 52 and the outflow port 58 are blocked from the combustion chamber 77 side by a fuel storage portion 80 disposed in the combustion chamber 77. In other words, the outflow port 52 and the outflow port 58 serve as a passage connecting the premixing chamber 70 and the fuel storage unit 80. The fuel storage part 80 should just be formed from the heat resistant material which can hold | maintain a liquid fuel so that vaporization is possible, for example, porous materials, such as a sintered metal, a ceramic, and a wire mesh, are used.
The operation of the burner according to the first embodiment will be described.

  When the temperature of the combustion air introduced into the premixing chamber 70 is lower than the temperature of the vaporized fuel, a part of the vaporized fuel is liquefied and liquefied while the gas mixture flows through the flow path in the premixing chamber 70. The fuel adheres to the inner wall of the premixing chamber 70 such as the outer side surface 40b of the cylindrical portion 40 and the inner side surface 50a of the cylindrical portion 50. The fuel adhering to the inner wall of the premixing chamber 70 flows downward along the inner wall due to gravity, exits from the outlet 52 and the outlet 58, and is held in the fuel reservoir 80.

  Note that the temperature is not limited to the fuel liquefied due to the temperature difference between the combustion air and the vaporized fuel, but when the temperature of the inner wall of the premixing chamber 70 is low, such as when the burner 20 is started, or when the burner 20 is stopped. Thus, when the temperature of the inner wall of the premixing chamber 70 decreases, unburned fuel liquefied due to the temperature of the inner wall being lower than the vaporization temperature also exits from the outlet 52 and the outlet 58, It is held in the fuel storage unit 80.

  Since the fuel storage unit 80 and the ignition unit 62 of the glow plug 61 are in contact with each other, when the burner 20 is started with the fuel stored in the fuel storage unit 80, the fuel stored in the fuel storage unit 80 is short. It is heated and vaporized over time and ignited. Then, starting from the flame generated by the ignition of the fuel in the fuel storage section 80, the combustion of the air-fuel mixture spreads and the flame F is generated. Therefore, the ignitability of the air-fuel mixture is improved. When starting the burner, the control device 97 opens the air valve 65 and introduces combustion air, then drives the glow plug 61 to heat the fuel in the fuel storage unit 80, and then the first It is preferable to inject fuel from the injection nozzle 90 by opening the fuel valve 94 and turning on the electric heater 95. By performing such control, combustion spreads smoothly from the flame generated by the ignition of the fuel in the fuel reservoir 80 to the air-fuel mixture.

Further, while the combustion of the air-fuel mixture is continued in the burner 20, heat is conducted from the flame to the fuel storage unit 80 through the outer wall of the premixing chamber 70, so that the fuel storage unit 80 holds the heat. The fuel is vaporized and burned. Therefore, the combustibility of the air-fuel mixture is improved.
As described above, according to the burner 20 of the first embodiment, waste of fuel is suppressed, and the ignitability and combustibility of the air-fuel mixture are improved, so that the fuel can be effectively used.
As described above, according to the burner 20 of the first embodiment, the effects listed below can be obtained.

  (1) At least a part of the fuel liquefied in the premixing chamber exits from the outlet 52 and the outlet 58 and is held in the fuel reservoir 80. When the burner is started again with the fuel held in the fuel storage unit 80, the fuel held in the fuel storage unit 80 is ignited by receiving heat from the glow plug 61, and the combustion spreads to the air-fuel mixture. . Therefore, the ignitability of the air-fuel mixture is improved and the fuel can be used effectively.

(2) Since the outflow port 52 and the outflow port 58 are connected, the liquefied fuel tends to enter the outflow ports 52 and 58. Therefore, the fuel liquefied in the premixing chamber 70 is easily guided to the fuel storage unit 80.
(Second Embodiment)

  A second embodiment of the burner will be described with reference to FIG. The second embodiment differs from the first embodiment in the internal configuration of the premixing chamber and the configuration of the glow plug. Below, it demonstrates centering on difference with 1st Embodiment, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, the inner side surface 50 a of the cylindrical portion 50 and the inner side surface 51 a that is the side surface facing the inner side of the cylindrical portion 50 among the side surfaces of the closing portion 51 are provided with the second storage portion. A fuel storage wall 53 is disposed. In other words, the fuel storage wall 53 is disposed on the inner wall of the premixing chamber 70 at a portion constituted by the cylindrical portion 50 and the closing portion 51.

  The glow plug 61 includes a plug storage part 66, and the ignition part 62 is surrounded by the plug storage part 66. The plug storage section 66 and the fuel storage section 80 that cover the ignition section 62 are in contact with each other, so that the ignition section 62 and the fuel storage section 80 are connected. The fuel storage wall 53 and the plug storage portion 66 are formed of a heat-resistant material capable of holding liquid fuel in a vaporizable manner, similarly to the fuel storage portion 80.

  A part of the fuel in the fuel tank 92 is supplied to the plug reservoir 66 through the fuel supply passage 91. The fuel supply passage 91 branches into a first supply passage 91a that supplies fuel to the injection nozzle 90 and a second supply passage 91b that supplies fuel to the plug reservoir 66, and the first fuel passage 91a includes a first fuel valve. 94 is attached, and a second fuel valve 96 is attached to the second supply passage 91b. The fuel tank 92, the second supply passage 91b, and the second fuel valve 96 constitute a supply unit that supplies fuel to the plug storage unit 66.

The control device 97 controls the opening and closing of the air valve 65, the opening and closing of the first fuel valve 94, the on / off of the electric heater 95, and the driving of the glow plug 61, and the opening and closing of the second fuel valve 96. The amount of vaporized fuel injected from the injection nozzle 90 is adjusted by controlling the opening and closing of the first fuel valve 94, and the amount of liquid fuel supplied to the plug reservoir 66 is controlled by controlling the opening and closing of the second fuel valve 96. Adjusted.
Hereinafter, control at the time of starting the burner 20 by the control device 97 will be described.

  When starting the burner 20, the control device 97 drives the glow plug 61 and opens the second fuel valve 96 with the first fuel valve 94 closed. That is, the control device 97 raises the temperature of the ignition unit 62 of the glow plug 61 and supplies the fuel to the plug storage unit 66 prior to the supply of fuel to the injection nozzle 90. As a result, the fuel stored in the plug reservoir 66 is heated and vaporized and ignited.

  When the control device 97 determines that the fuel stored in the plug reservoir 66 has been ignited, the control device 97 opens the first fuel valve 94 and supplies the fuel to the injection nozzle 90. Thereby, the air-fuel mixture including the vaporized fuel injected from the injection nozzle 90 flows into the combustion chamber 77, and the combustion of the air-fuel mixture spreads starting from the flame generated by the ignition of the fuel in the plug reservoir 66. As a result, a flame F is generated. The control device 97 opens the air valve 65 according to the amount of combustion air required when the second fuel valve 96 is opened and when the first fuel valve 94 is opened.

When the control device 97 determines that the progress of combustion by the vaporized fuel injected from the injection nozzle 90 has been established, the control device 97 closes the second fuel valve 96 and stops driving the glow plug 61. Thereafter, the control device 97 determines the fuel supply amount to the injection nozzle 90 and the combustion air supplied to the combustion chamber 77 and the premixing chamber 70 based on the temperature and target temperature of the DPF 12 and the exhaust temperature and exhaust flow rate in the exhaust passage 11. The amount is determined, and the DPF 12 is heated to a target temperature through control of opening and closing of the first fuel valve 94 and opening and closing of the air valve 65.
The operation of the burner according to the second embodiment will be described.

  Since the fuel storage wall 53 is disposed on the inner wall of the premixing chamber 70, the fuel liquefied in the premixing chamber 70 is held by the fuel storage wall 53. When the combustion of the air-fuel mixture is started in the burner 20, heat is conducted from the flame to the fuel storage wall 53 through the inner wall of the premixing chamber 70, so that the fuel held in the fuel storage wall 53 is vaporized. And mix with the mixture. Therefore, the fuel can be used effectively. Note that part of the fuel liquefied in the premixing chamber 70 exits from the outlet 52 and the outlet 58 and is held in the fuel storage unit 80 to improve the ignitability of the air-fuel mixture, as in the first embodiment. Contribute to.

  Moreover, since the plug storage part 66 is arrange | positioned around the ignition part 62 in the glow plug 61, compared with 1st Embodiment, a fuel is in the position which receives the heat from the glow plug 61 more directly. Stored. As a result, the ignitability of the air-fuel mixture is further enhanced as compared with the configuration in which only the fuel storage unit 80 is provided as in the first embodiment. In addition, since fuel is actively supplied to the plug reservoir 66 through the second supply passage 91b, a stable flame is generated in the vicinity of the glow plug 61.

Further, when the burner 20 is started, prior to the injection of vaporized fuel from the injection nozzle 90, the temperature of the ignition part 62 of the glow plug 61 and the supply of fuel to the plug storage part 66 are performed. A flame is generated nearby. Thus, the combustion spreads more smoothly and the ignitability of the entire air-fuel mixture is improved than when the ignition by the glow plug 61 is performed on the air-fuel mixture supplied from the premixing chamber 70 in the absence of such a flame. Enhanced.
As described above, according to the burner 20 of the second embodiment, the effects listed below can be obtained in addition to the effects (1) and (2) of the first embodiment.

(3) At least a part of the fuel liquefied in the premixing chamber 70 is held by the fuel storage wall 53. When combustion of the air-fuel mixture is started by the burner 20, the fuel held in the fuel storage wall 53 is vaporized and mixed with the air-fuel mixture, and used for combustion. Therefore, the fuel can be used effectively.
(4) The fuel is held at a position where the plug reservoir 66 directly receives heat from the glow plug. Therefore, the ignitability of the air-fuel mixture is further improved.

(5) Since the generation of the flame based on the fuel held by the plug storage unit 66 is performed prior to the ignition of the air-fuel mixture that has passed through the communication passage 56, the ignitability of the air-fuel mixture is further improved.
The first and second embodiments can be implemented with the following modifications.

  -In 1st and 2nd embodiment, the position where the fuel storage part 80 is arrange | positioned, and the position where the outflow ports 52 and 58 are formed are with respect to the centerline of the cylinder part 50 in the outer side surface 50b of the cylinder part 50. Not only the lower side in the vertical direction but also a part of the outer side surface 50b of the cylinder part 50 only needs to be positioned on the upper side in the vertical direction of the fuel storage part 80. The fuel liquefied in the premixing chamber 70 collects by gravity on the lower side in the vertical direction with respect to the center line of the cylindrical portion 50. Therefore, the fuel storage portion 80 and the outlets 52 and 58 are disposed on the lower side in the vertical direction with respect to the center line of the cylinder portion 50, that is, directly below the center line of the cylinder portion 50 in the outer surface 50 b of the cylinder portion 50. This is preferable because the liquefied fuel is efficiently collected in the fuel storage unit 80.

  As shown in FIG. 6, in the first and second embodiments, the outlet 52 may be a hole that does not reach the cylinder end of the cylinder portion 50 on the substrate 21 side. Further, the outlet 58 may be a hole that does not reach the inner edge of the burner head 55. In short, the outflow port 52 and the outflow port 58 may be holes that serve as a fuel passage from the premixing chamber 70 to the fuel reservoir 80. In addition, it is preferable that the outlet 52 reaches the cylinder end on the substrate 21 side of the cylindrical portion 50 because the liquefied fuel enters the outlet 52 without being blocked by the end of the cylindrical portion 50. Further, it is preferable that the outlet 58 reaches the inner edge of the burner head 55 because the liquefied fuel enters the outlet 58 without being blocked by the end of the burner head 55.

  Although the shape of the fuel reservoir 80 is not particularly limited, as shown in FIG. 6, if the fuel reservoir 80 has a shape that enters the inside of the outlet 52 and the outlet 58, the vicinity of the outlet 52 and the outlet 58. It is preferable because the fuel that has reached the point can easily flow into the fuel storage unit 80. In particular, when the outlet 58 is a hole that does not reach the inner edge of the burner head 55, if the fuel reservoir 80 protrudes from the outlet 58 to the inside of the premixing chamber 70, The fuel that flows downward in the vertical direction can easily flow into the fuel storage unit 80.

  In the above embodiment, each of the outlet 52 and the outlet 58 is formed one by one. However, if the outlet 52 and the outlet 58 are configured to be closed by the fuel reservoir 80 from the combustion chamber 77 side. A plurality of outlets 52 may be formed, and a plurality of outlets 58 may be formed. Further, the outflow port 52 may be formed only in the cylindrical portion 50, and the outflow port 58 may not be formed in the burner head 55. In this case, the fuel reservoir 80 may be disposed at a position that does not contact the burner head 55. Further, the outlet 58 may be formed only in the burner head 55, and the outlet 52 may not be formed in the cylindrical portion 50. In this case, as long as a part of the outer side surface 50b of the cylinder part 50 is located on the upper side in the vertical direction of the fuel storage part 80, the fuel storage part 80 may be arranged at a position that does not contact the cylinder part 50. Good.

  -In 1st and 2nd embodiment, the fuel storage part 80 and the plug storage part 66 have a catalytic action, such as platinum and palladium, especially when the fuel storage part 80 and the plug storage part 66 are formed from the ceramic. A metal may be supported. According to this, the ignition of the fuel retained by the fuel reservoir 80 and the plug reservoir 66 is promoted by the catalytic action.

  In the first and second embodiments, the glow plug 61 is inserted into the cylinder part 30 from below the cylinder part 50 and the fuel storage part 80 along the vertical direction. Not only this but as FIG. 7 shows, the glow plug 61 may be inserted in the cylinder part 30 from the side of the cylinder part 50 and the fuel storage part 80 along the direction orthogonal to a perpendicular direction. . In short, the ignition part 62 of the glow plug 61 may be arranged on the lower side in the vertical direction with respect to the cylinder part 50.

  -In 1st and 2nd embodiment, the ignition part 62 of the glow plug 61 should just be arrange | positioned in the vicinity of the fuel storage part 80, the ignition part 62 may be in contact with the fuel storage part 80, The ignition unit 62 may be connected to the fuel storage unit 80 with another member interposed therebetween, or there may be a space between the ignition unit 62 and the fuel storage unit 80. That is, if the ignition part 62 of the glow plug 61 is arranged on the lower side in the vertical direction with respect to the cylinder part 50, the ignition part 62 is arranged on the upper side or the side in the vertical direction with respect to the cylinder part 50. Compared with the configuration, when the fuel storage unit 80 receives heat from the ignition unit 62, the fuel held in the fuel storage unit 80 is ignited in a short time, and the ignitability of the air-fuel mixture is improved.

  As shown in FIG. 7, in the second embodiment, the glow plug 61 has a flame holding portion 69 that guides the flame generated by the ignition of the fuel held by the plug storage portion 66 around the plug storage portion 66. It is preferable to provide. The flame holding portion 69 is formed in a slope shape extending from the plug storage portion 66 toward the ejection port 32, for example. The flame holding section 69 stabilizes the combustion of the fuel held by the plug storage section 66. As a result, since the flame generated from the fuel held by the plug reservoir 66 is appropriately maintained, the air-fuel mixture supplied from the premixing chamber 70 is easily ignited starting from this flame. As shown in FIG. 7, the flame holding section 69 has a passage 82 that connects the plug storage section 66 and the fuel storage section 80 in addition to the configuration for guiding the flame, and the ignition section 62 is a plug storage section. It is preferable to connect the fuel storage unit 80 with 66 therebetween. Also in this case, the glow plug 61 may be inserted into the cylinder part 30 from below the cylinder part 50 and the fuel storage part 80 along the vertical direction, as shown in FIG.

  -In 2nd Embodiment, if the fuel storage wall 53 is an inner wall of the premixing chamber 70, it may be arrange | positioned at the outer surface 40b of the cylinder part 40, for example, and one of the inner surface 50a of the cylinder part 50 It may be arranged in the part. However, the fuel storage wall 53 is a member serving as a boundary between the premixing chamber 70 and the combustion chamber 77 in the inner wall of the premixing chamber 70, such as the inner side surface 50 a of the cylindrical portion 50 and the inner side surface 51 a of the closing portion 51. It is preferable that it is arrange | positioned at the inner wall comprised from these. The inner wall composed of the members that serve as the boundary between the premixing chamber 70 and the combustion chamber 77 is easy to transmit heat from the flame when the air-fuel mixture is burned in the combustion chamber 77. Accordingly, the fuel held on the fuel storage wall 53 is easily vaporized.

  In the second embodiment, when the burner 20 is started, the supply of fuel to the plug storage unit 66 and the temperature increase of the ignition unit 62 of the glow plug 61 are performed simultaneously with the injection of vaporized fuel from the injection nozzle 90. Also good. Even with this configuration, the effect (4) can be obtained.

  -In 2nd Embodiment, the structure for supplying the fuel storage wall 53 to the burner 20 of 1st Embodiment, and supplying a fuel to the plug storage part 66 and the plug storage part 66 is added to the burner 20 in 2nd Embodiment. You may have the structure which is not. Alternatively, the burner 20 has a configuration in which the configuration for supplying fuel to the plug storage portion 66 and the plug storage portion 66 is added to the burner 20 of the first embodiment, and the fuel storage wall 53 is not added. It may be.

  -In 1st and 2nd embodiment, in the burner 20, the cylinder part 40 and the connection wall part 41 may be omitted. Further, the cut-and-raised piece 35 and the guide portion 68 that cause the swirling flow in the combustion air in the combustion chamber 77 and the premixing chamber 70 may be omitted. In short, the burner 20 should just have the structure which partitions the space in the cylinder part 30 into the premixing chamber 70 and the combustion chamber 77 by the cylinder part 50 and the burner head 55 at least.

  -In 1st and 2nd embodiment, each cylinder part should just be cylindrical, and the internal diameter of each cylinder part may be changing along the axial direction. For example, the cylindrical portion 50 may have a cylindrical shape having an outer diameter that is constant and an inner diameter that decreases toward the ejection port 32. According to such a configuration, the inner side surface 50a of the cylinder portion 50 is inclined downward in the vertical direction toward the cylinder end on the substrate 21 side, so that the liquefied fuel easily flows into the outlet 52.

  -In 1st and 2nd embodiment, although the burner 20 was installed so that the axial direction of each cylinder part might become parallel to a horizontal direction, the axial direction of a cylinder part does not need to be parallel to a horizontal direction. The part 50 should just be the structure extended in the direction different from a perpendicular direction toward the ejection opening 32 in the cylinder part 30. FIG.

  In the exhaust passage 11, downstream of the burner 20, not only the DPF 12, but a catalyst for purifying exhaust gas may be provided. According to such a configuration, since the temperature of the catalyst is raised by the burner 20, it is possible to quickly raise the temperature of the catalyst to the activation temperature.

  DESCRIPTION OF SYMBOLS 20 ... Burner, 21 ... Substrate, 30 ... Tube part, 30a ... Inner side surface, 31 ... Ejection plate, 32 ... Ejection port, 33 ... Extension part, 34 ... Introduction port, 35 ... Cut-and-raised piece, 36 ... Introduction Mouth, 40 ... tube portion, 40b ... outer surface, 41 ... connecting wall portion, 50 ... tube portion, 50a ... inner surface, 50b ... outer surface, 51 ... closed portion, 51a ... inner surface, 52 ... outflow port, 53 ... Fuel storage wall, 55 ... burner head, 56 ... communication path, 57 ... wire mesh, 58 ... outlet, 60 ... cylinder part, 61 ... glow plug, 62 ... ignition part, 63 ... blocking plate, 64 ... air supply path, 65 DESCRIPTION OF SYMBOLS ... Air valve, 66 ... Plug storage part, 67 ... Air distribution chamber, 68 ... Guide part, 69 ... Flame holding part, 70 ... Premixing chamber, 77 ... Combustion chamber, 80 ... Fuel storage part, 82 ... Passage, 90 ... Injection nozzle, 91 ... fuel supply passage, 91a ... first supply passage, 91b ... second supply passage, 9 ... Fuel tank, 93 ... Fuel pump, 94 ... first on-off valve, 95 ... electric heater, 96 ... second on-off valve, 97 ... control unit.

Claims (5)

A first tube portion having a discharge port at the end of the tube from which the combustion gas obtained by burning the air-fuel mixture is blown;
A second cylindrical portion extending in a direction different from the vertical direction toward the ejection port in the first cylindrical portion, and on the ejection port side in a cylindrical end of the second cylindrical portion The second tube portion having a closing portion for closing the tube end located;
A wall portion that connects an inner surface of the first tube portion and an outer surface of the second tube portion, and is a space in the first tube portion by the second tube portion and the wall portion. The wall is formed with a premixing chamber and a combustion chamber which is a space closer to the ejection port than the premixing chamber, and a communication passage is formed to communicate the premixing chamber and the combustion chamber. And
In the combustion chamber, a glow plug having an ignition part disposed on the lower side in the vertical direction with respect to the second cylinder part;
A storage part disposed in the combustion chamber and capable of holding liquid fuel in a vaporizable manner, wherein the storage part has a part of the outer surface of the second cylindrical part located above the storage part in a vertical direction; With
A passage connecting the premixing chamber and the storage portion is formed in each of the second cylindrical portion and the wall portion ,
The said channel | path which the said 2nd cylinder part has, and the said channel | path which the said wall part has are burners connected with the corner | angular part which the said 2nd cylinder part and the said wall part connect . The burner according to claim 1 , wherein the storage portion blocks the passage of the second cylindrical portion and the passage of the wall portion. The storage part is a first storage part,
3. The burner according to claim 1, further comprising a second storage portion that is provided in a portion facing the premixing chamber in the second cylindrical portion and the closing portion and that can hold liquid fuel in a vaporizable manner. The glow plug is
It is arranged around the ignition part, and includes a plug storage part that can hold liquid fuel in a vaporizable manner,
The burner is
The burner as described in any one of Claims 1-3 further provided with the supply part which supplies a fuel to the said plug storage part from the outer side of a said 1st cylinder part. The burner is
And a controller that raises the temperature of the ignition part of the glow plug and supplies the fuel to the plug storage part before the fuel is supplied to the premixing chamber. Item 5. The burner according to item 4.

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