WO2016195046A1 - 蒸発式バーナ - Google Patents
蒸発式バーナ Download PDFInfo
- Publication number
- WO2016195046A1 WO2016195046A1 PCT/JP2016/066498 JP2016066498W WO2016195046A1 WO 2016195046 A1 WO2016195046 A1 WO 2016195046A1 JP 2016066498 W JP2016066498 W JP 2016066498W WO 2016195046 A1 WO2016195046 A1 WO 2016195046A1
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- WO
- WIPO (PCT)
- Prior art keywords
- air supply
- evaporative burner
- end side
- fuel
- space
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D3/00—Burners using capillary action
- F23D3/40—Burners using capillary action the capillary action taking place in one or more rigid porous bodies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
- F23L9/02—Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air above the fire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/06—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners
- F23Q7/08—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners for evaporating and igniting liquid fuel, e.g. in hurricane lanterns
Definitions
- the present invention relates to an evaporation burner.
- an evaporative burner in which a wick disposed at one end of a combustion chamber is impregnated with fuel and fuel vapor generated from the wick is heated by a glow plug disposed in the vicinity of the wick for ignition and combustion. Yes.
- Such an evaporative burner is expected to be used as a heat source in a device for the purpose of regeneration of a diesel particulate filter (DPF) mounted on a vehicle using diesel fuel and heating of a vehicle and a house, for example. .
- DPF diesel particulate filter
- the evaporation element bends so as to surround the ignition mechanism (glow plug), thereby improving the heat transfer from the ignition mechanism to the evaporation element and improving the ignitability of the evaporation burner.
- the ignition mechanism glow plug
- a swirling flow is generated in the combustion chamber by inclining the longitudinal direction of the slot (air inlet) for introducing air into the combustion chamber (combustion chamber) with respect to the axial direction (longitudinal direction) of the combustion chamber. It has been proposed to improve the continuity of combustion in the combustion chamber (see, for example, Patent Document 3).
- the width of the slot as the air supply port is constant over the entire length in the longitudinal direction, and an air supply pipe for supplying air to the slot is provided.
- the connecting portion to be connected is formed on the upstream side (wick side) of the slot. For this reason, the amount of air supplied to the combustion chamber via the slot is smaller on the downstream side (opposite side of the wick), and there is a possibility that incomplete combustion of the fuel may occur on the downstream side of the combustion chamber.
- the evaporative burner according to the conventional technique has the following first to third problems.
- Further, as a third problem there is a problem of reducing air shortage that causes incomplete combustion of fuel on the downstream side of the combustion chamber.
- the present invention has been made by intensive studies by the present inventor in order to solve various problems to be solved in the conventional evaporation burner including the first to third problems described above. An outline of the evaporation burner according to various aspects of the present invention will be described below.
- the evaporative burner according to the first aspect of the present invention (hereinafter sometimes referred to as “first burner”) includes a combustion chamber, an impregnation member, and a fuel supply. And an ignition device.
- the combustion chamber is a space defined by an inner housing which is a bottomed cylindrical container composed of a bottom wall and a peripheral wall.
- the impregnation member is a member that is disposed at a first end portion that is an end portion on the bottom wall side of the inner housing in the combustion chamber and has a capillary structure and / or a porous structure.
- the fuel supply unit supplies fuel to the impregnation member and impregnates the fuel into the impregnation member.
- the ignition device heats and vaporizes the fuel vapor evaporated from the impregnation member.
- the first burner further includes a promoting member.
- the accelerating member is a member in which a large number of through-holes are formed, and is arranged on the second end side, which is the end portion of the combustion chamber opposite to the first end portion with respect to the impregnation member in the combustion chamber. A predetermined distance is provided between the impregnation member.
- the ignition device is disposed in the combustion chamber so as to be exposed to an ignition space that is a space located closer to the first end portion than the promotion member. Furthermore, a first air supply port and a second air supply port are formed in the peripheral wall of the inner housing. The first air supply port is at least partially open to the ignition space and supplies air to the ignition space. The second air supply opening opens into a combustion space that is a space located on the second end side of the promotion member in the combustion chamber and supplies air to the combustion space.
- the ignition device is directed upward in the ignition space from the peripheral wall of the inner housing below the vertical center of the impregnation member in a state where the evaporative burner is used. It can be arranged to protrude.
- the tip of the ignition device may be disposed so as to be located below the center in the vertical direction of the impregnation member when the evaporative burner is used.
- the evaporative burner according to the second aspect of the present invention (hereinafter sometimes referred to as “second burner”) is the first burner described above.
- the fuel supply unit is configured to supply the fuel to a smooth surface formed on the surface of the impregnation member on the first end side. Further, a recess or a notch is formed in a region of the impregnating member facing the ignition device, and the ignition device is positioned at least partially inside the recess or the notch. It is arranged.
- the evaporative burner according to the third aspect of the present invention is the first burner described above or the first burner. It is a 2 burner, Comprising: The said 2nd air inlet is comprised by any one or both of an air supply opening arrangement
- the supply air opening array includes a plurality of openings formed at predetermined intervals from the first end side to the second end side in a predetermined region of the peripheral wall of the inner housing that defines the combustion space. At least one array of parts.
- the air supply slit is formed with a predetermined width and a predetermined length from the first end side to the second end side in a predetermined region of the peripheral wall of the inner housing that defines the combustion space. At least one slit.
- the flow rate of the air supplied to the combustion space through the second air supply port is configured so that the second end side is larger than the first end side of the second air supply port. ing.
- the plurality of openings constituting the air supply opening array are gradually increased as the opening area of each opening is directed from the first end side to the second end side.
- the width of the air supply slit may be configured to gradually increase from the first end side toward the second end side.
- the air supply opening array may be configured such that a longitudinal direction of the air supply opening array and a direction parallel to the axis of the inner housing form a predetermined angle.
- the air supply slit may be configured such that a longitudinal direction of the air supply slit and a direction parallel to the axis of the inner housing form a predetermined angle.
- the air supply opening array has an angle formed between a longitudinal direction of the air supply opening array and a direction parallel to the axis of the inner housing from the first end side toward the second end side. It can be configured to change.
- the air supply slit is configured such that an angle formed between a longitudinal direction of the air supply slit and a direction parallel to the axis of the inner housing is changed from the first end side toward the second end side. Can be done.
- the third burner described above is provided in the outer housing through an outer housing disposed on the outer periphery of the inner housing and a third air supply port which is an opening formed in the peripheral wall of the outer housing. And an air supply pipe for supplying air.
- an air supply passage is formed between the peripheral wall of the outer housing and the peripheral wall of the inner housing, which is a space in which both ends on the first end side and the second end side are closed. Yes.
- the third air supply port is formed closer to the second end portion than the second air supply port.
- an evaporative burner according to the fourth aspect of the present invention is the first to third burners described above, and the promotion member.
- the impregnating member also has a central portion convex toward the first end side. It is comprised by the plate-shaped member which has a curved surface shape.
- the evaporative burner according to the fifth aspect of the present invention (hereinafter sometimes referred to as “fifth burner”) is the first to third burners described above, and is the promotion member. Includes a protrusion that is a portion extending toward the first end, and the protrusion is in contact with the impregnation member.
- the protruding portion may be a ridge formed so as to protrude toward the first end portion in a part of the promotion member.
- the protuberance is in contact with the impregnation member by fitting into a recess formed on the second end portion side of the impregnation member.
- the evaporative burner according to the sixth aspect of the present invention (hereinafter, sometimes referred to as “sixth burner”) is the first to third burners described above, and is the promotion member. Is configured by a plurality of elements that are promotion elements.
- Each of the promoting elements includes a main part that is a part having a plate shape, and a support part that is a part having a columnar shape extending in a normal direction of the main part, and the support Are inserted into the impregnating member, and are fixed independently at predetermined positions, and the through hole of the promoting member is formed by a gap between the main parts of the plurality of promoting elements. ing.
- the evaporative burner according to the seventh aspect of the present invention is the first to sixth burners described above, and is the impregnation member.
- the coarseness of the layer that is present is finer than the coarseness of the layer that is exposed on the second end side.
- an amount of air suitable for igniting the fuel by the ignition device can be supplied to the vicinity of the ignition device through the first air supply port.
- the second burner fuel can be supplied to the smooth surface formed on the surface of the impregnating member on the first end side. As a result, the fuel can easily penetrate into the impregnated member. Further, according to the second burner, at least a part of the ignition device is disposed inside a recess or notch formed in a region of the impregnating member facing the ignition device. As a result, heat transfer from the ignition mechanism to the impregnated member can be improved. As a result, the ignitability of the evaporative burner can be further improved.
- the second air supply port is configured by one or both of the air supply opening array and the air supply slit described above, and the air supplied to the combustion space through the second air supply port. Is configured such that the second end side (downstream side) is larger than the first end side (upstream side) of the second air supply port.
- the promotion member is comprised by the plate-shaped member which has the curved surface shape in which the center part protrudes to the 1st edge part side.
- the rigidity (section modulus) of the accelerating member is increased and the deformation (thermal deformation) of the accelerating member due to a temperature change accompanying fuel combustion can be reduced as compared with a flat plate (plate-shaped) accelerating member.
- the impregnating member is also constituted by a plate-like member having a curved surface shape whose central portion is convex toward the first end portion.
- the accelerating member includes a protruding portion that is a portion extending toward the first end portion, and the protruding portion is in contact with the impregnating member.
- the accelerating member is constituted by a plurality of accelerating elements that are fixed to a predetermined position independently of each other by inserting each support portion into the impregnating member. Since the thermal deformation of each promotion element is small, it is possible to reduce the thermal deformation of the entire promotion member that accompanies the combustion of fuel.
- the impregnated member is constituted by a laminated body including a plurality of layers made of a member having a capillary structure and / or a porous structure, and the layer eyes exposed to the first end side. Is coarser than the roughness of the layer exposed on the second end side.
- FIG. 2 is a sectional view taken along line AA in FIG. 1.
- the front view (a) observed from the downstream which shows the structure of the impregnation member used for the evaporation type burner concerning Example 1 of the present invention, the bottom view (b) of (a), the perspective view observed from the downstream ( c) and a perspective view (d) observed from the upstream side.
- FIG. 1 It is a schematic diagram which shows another example of the impregnation member which concerns on the modification of Example 1 of this invention, the front view observed from the downstream (a), the bottom view (b) of (a), and observed from the downstream It is the perspective view (c) and the perspective view (d) observed from the upstream.
- FIG. 1 It is a schematic diagram which shows another example of the air supply opening arrangement
- FIG. 1 It is a schematic diagram which shows another example of the air supply slit comprised as a 2nd air supply port formed in the surrounding wall of the inner side housing of the evaporation type burner which concerns on the modification of Example 2 of this invention. It is typical sectional drawing of the evaporation type burner which concerns on Example 3 of this invention. It is a schematic diagram explaining that the fuel supplied from the fuel supply pipe penetrates smoothly in the impregnating member according to Example 3 of the present invention and spreads easily inside. It is a schematic diagram explaining that the flame which generate
- FIG. 1 is a schematic diagram illustrating a state in which the evaporation burner 1 according to the first embodiment of the present invention is observed from the downstream side.
- 2 is a cross-sectional view taken along line AA in FIG.
- the upper side in the vertical direction upper side of the paper in FIGS. 1 and 2 in a state where the evaporative burner 1 is used (for example, a state where it is mounted on a vehicle) is “upward” and the opposite side.
- a certain lower side is defined as “downward”.
- the left side of the sheet of FIG. 2 is referred to as “upstream side”, and the opposite right side is referred to as “downstream side”.
- the evaporative burner 1 includes an outer housing 2 and an inner housing 3 disposed inside the outer housing 2.
- the shapes of the outer housing 2 and the inner housing 3 are not particularly limited, and can be appropriately designed according to the application and use environment of the evaporative burner 1, for example.
- the outer housing 2 is formed as a cylindrical peripheral wall
- the inner housing 3 is a cylindrical peripheral wall 3a coaxial with the peripheral wall of the outer housing 2 and a bottom disposed at the upstream end of the peripheral wall. It was formed as a bottomed cylindrical container composed of the wall 15.
- the bottom wall 15 is constituted by a “pressing member” described later. Therefore, in the following description, the bottom wall 15 may be referred to as a “pressing member 15”.
- An air supply passage 4 is formed between the peripheral wall of the outer housing 2 and the peripheral wall of the inner housing 3 and is a space in which both ends on the upstream side and the downstream side are closed.
- a third air supply port which is an opening, is formed in the peripheral wall of the outer housing 2, and an air supply pipe 5 is connected to the third air supply port, and the air supply in the outer housing 2 is supplied by an air supply means (not shown). Air is supplied to the passage 4.
- the flow rate of the air supplied to the air supply passage 4 can be arbitrarily changed by a flow rate control unit (not shown).
- the air layer supplied through the air supply passage 4 formed between the peripheral wall of the outer housing 2 and the peripheral wall of the inner housing 3 as described above can function as a heat insulating layer. As a result, it is possible to prevent the heat in the combustion chamber 30 from being conducted to the outer housing 2 during the combustion of the fuel and affecting the facilities other than the evaporative burner 1 due to the heat.
- a mounting member 6 made of a flange or the like is provided on the downstream end of the outer housing 2 so as to protrude outward.
- the combustion chamber 30 is a space defined by the inner housing 3.
- An impregnation member 8 is disposed at a first end portion that is an end portion on the holding member 15 side (upstream side) that constitutes the bottom wall of the inner housing 3 in the combustion chamber 30. Accordingly, a space downstream of the impregnation member 8 in the inner space of the inner housing 3 substantially corresponds to the combustion chamber 30.
- a second end (downstream end) which is an end opposite to the first end (upstream end) of the inner housing 3 opens as an opening 2a.
- the impregnation member 8 is formed of a material that has heat resistance, chemical stability to the fuel (for example, corrosion resistance, etc.) and flexibility and can be impregnated with the fuel.
- the impregnation member 8 is a member that is formed of, for example, a metal and a ceramic material and has a capillary structure and / or a porous structure.
- a wick formed by pressing metal fibers and / or ceramic fibers is used as the impregnating member 8.
- the impregnation member 8 is formed in a substantially disc shape and is provided so as to cover the entire cross section of the combustion chamber 30 by a plane perpendicular to the axis of the inner housing 3.
- the impregnating member 8 in the present embodiment is formed with a concave step portion 8a over the entire outer peripheral portion (outer edge portion) of the downstream main surface. Except for the recessed portion 8c to be formed, it is formed in a planar shape.
- the main surface 8b on the upstream side of the impregnating member 8 is formed as a flat surface or a smooth surface (without unevenness) made of a curved surface.
- the main surface 8b on the upstream side of the impregnating member 8 is formed as a flat surface. This makes it easier to mold the impregnated member than the case where the impregnated member (evaporating element) is curved so as to surround the ignition device (glow plug) as in the evaporative burner according to the prior art described at the beginning.
- the manufacturing process can be simplified and the manufacturing cost can be reduced.
- a recess 8 c is formed in the lower part of the main surface on the downstream side (second end side) of the impregnation member 8 from the outer edge of the impregnation member 8 toward the inside (center side).
- the concave portion 8 c is opened on the radially outer side and the downstream side of the impregnating member 8.
- the recess 8c can be formed in an arbitrary shape as long as it accommodates at least a part of the ignition device 22 described later.
- corner portion formed by the circumferential wall surface in the circumferential direction forming the recess 8c and the bottom wall surface on the upstream side and the corner portion formed by the circumferential wall surface in the circumferential direction forming the recess 8c and the main surface on the downstream side are shown in FIG. As shown, it may be a shape with an edge that is not chamfered, or may be a shape that is chamfered to a curved surface as shown in FIG.
- the recess 8 c is formed from the radially outer end of the impregnation member 8 toward the center of the impregnation member 8, and the radially outer end of the recess 8 c is the center of the impregnation member 8. And the end of the concave portion 8 c on the center side is formed so as to be positioned below the center of the impregnation member 8 in the vertical direction.
- the concave portion 8c is not an essential component, and the concave portion 8c may not be formed.
- the impregnation member 8 may be composed of one layer or a plurality of layers.
- the impregnation member 8 is constituted by a laminate including a plurality of layers made of a member having a capillary structure and / or a porous structure, and the first end portion of the plurality of layers constituting the impregnation member 8 is formed.
- the roughness of the layer exposed on the side (upstream side) may be finer than the roughness of the layer exposed on the second end side (downstream side).
- the impregnating member 8 is constituted by two layers, and the upstream layer uses a wick formed of finer fibers than the downstream layer so that the fuel permeability is reduced. And increased the durability against the flame during fuel combustion by roughening the downstream layer.
- An accelerating member 10 is provided on the downstream side (second end side) of the impregnation member 8 in the combustion chamber 30 with a predetermined distance from the impregnation member 8.
- the promotion member 10 is a member in which a large number of through holes are formed.
- the promotion member 10 in the present embodiment is formed as a perfect circular plate and is provided so as to cover the entire cross section of the combustion chamber 30 by a plane orthogonal to the axis of the inner housing 3.
- a space forming member 12 for forming a space 11 between the impregnating member 8 and the promoting member 10 is disposed.
- the space forming member 12 is engaged with the stepped portion 8a of the impregnating member 8 excluding the concave portion 8c, and a C-shaped outer peripheral portion 12a in which a portion corresponding to the concave portion 8c is cut out, and in the circumferential direction of the outer peripheral portion 12a.
- a plurality of leg portions 12b provided at appropriate intervals and projecting from the outer peripheral portion 12a toward the downstream side. The downstream ends of the plurality of leg portions 12b come into contact with the promotion member 10, so that a predetermined interval is ensured between the impregnation member 8 and the promotion member 10, and a space 11 is formed between them.
- the promotion member 10 has a large number of through holes 10a formed at predetermined intervals over the entire surface other than the lower portion thereof. Furthermore, a through hole 10b is formed in the portion of the promoting member 10 located on the downstream side of the recess 8c of the impregnating member 8.
- the accelerating member 10 is positioned by coming into contact with a positioning portion 14 that protrudes inward from the peripheral wall 3a of the inner housing 3 when it is inserted from the upstream side of the inner housing 3.
- a positioning portion 14 that protrudes inward from the peripheral wall 3a of the inner housing 3 when it is inserted from the upstream side of the inner housing 3.
- the positioning portion 14 is formed by projecting the peripheral wall 3a of the inner housing 3 inward.
- the positioning portion 14 may be formed integrally with the inner housing 3 or may be formed as a separate part from the inner housing 3.
- a holding member 15 is fixed to the inner housing 3 on the upstream side of the impregnating member 8 by a technique such as welding. In this way, by holding the impregnating member 8 between the pressing member 15 and the space forming member 12, it is possible to prevent the impregnation member 8 from being damaged due to vibration or the like that occurs when the evaporative burner 1 is used. it can.
- the pressing member 15 also functions as the bottom wall of the inner housing 3.
- the method of positioning the impregnation member 8 and the promotion member 10 in the combustion chamber 30 defined inside the inner housing 3 is not limited to the above.
- a positioning portion may be formed in each of the impregnation member 8 and the promotion member 10, or each of the impregnation member 8 and the promotion member 10 may be fixed inside the peripheral wall 3a of the inner housing 3 by a technique such as welding. Also good.
- a through hole is formed in the pressing member 15, and a fuel supply pipe 16 is connected to the through hole.
- fuel is supplied from a fuel supply section (not shown) through the fuel supply pipe 16 to the main surface 8b on the upstream side of the impregnating member 8 which is a smooth surface.
- the position of the through hole in the pressing member 15 (that is, the position where the fuel supply pipe 16 is connected) is not particularly limited as long as the fuel can be supplied to the smooth surface of the impregnation member 8.
- the fuel supply pipe 16 is connected to the position of the pressing member 15 corresponding to the central portion of the main surface 8b on the upstream side of the impregnation member 8.
- the orifice 20 was fitted and fixed to the downstream end of the inner housing 3 to reduce the sectional area of the combustion chamber 30 (that is, the combustion gas flow path was narrowed). As a result, part of the combustion gas that has reached the downstream end of the combustion chamber 30 is turned to the upstream side to promote gas mixing in the combustion chamber 30 and to return the unburned fuel to the upstream side. It also leads to burning.
- the method for reducing the cross-sectional area in the downstream portion of the combustion chamber 30 is not limited to the above.
- the peripheral wall 3a of the inner housing 3 is bent inward rather than the orifice 20 as a separate part as described above. Or an orifice may be formed.
- the orifice 20 is not an essential constituent element, and the orifice 20 may not be formed.
- an ignition device mounting member 21 is disposed at a position in the outer housing 2 corresponding to the radially outer end of the recess 8c.
- the tip of the ignition device mounting member 21 (the end on the combustion chamber 30 side) reaches the inside of the air supply passage 4, but is configured not to contact the inner housing 3. This prevents the heat in the combustion chamber 30 from being conducted to the outer housing 2 via the ignition device mounting member 21 during the combustion of the fuel and affecting the facilities other than the evaporative burner 1 due to the heat. Can do.
- An ignition device 22 is fixed to the ignition device mounting member 21.
- the ignition device 22 is not particularly limited as long as the fuel vapor evaporated from the impregnating member 8 can be heated and ignited, and any ignition plug can be used. In this embodiment, a glow plug is used as the ignition device 22.
- the position of the ignition device 22 is not particularly limited as long as the fuel vapor evaporated from the impregnation member 8 can be heated and ignited.
- the ignition device 22 is first in the combustion chamber 30 than the acceleration member 10. It arrange
- the ignition device 22 is disposed so as to protrude upward in the ignition space from the peripheral wall 3a of the inner housing 3 below the center of the impregnation member 8 in the vertical direction.
- the tip portion (heat generating portion) of the ignition device 22 is disposed so as to be located below the center of the impregnation member 8 in the vertical direction, and at least a portion thereof is located inside the recess 8c. It is arranged like this.
- a first air supply port 24 that is at least partially opened in the ignition space and supplies air to the ignition space is formed. That is, the first air supply port 24 may be formed so that the entirety of the first air supply port 24 opens into the ignition space, or straddles the ignition space and the combustion space as in the present embodiment shown in FIG. It may be formed so as to open.
- a plurality of first air supply ports 24 made of small holes formed in the peripheral wall 3a of the inner housing 3 are formed over the entire circumferential direction at a predetermined interval.
- the first air supply port 24 may not be formed over the entire circumferential direction of the peripheral wall 3a but may be formed only in the lower portion of the peripheral wall 3a.
- an auxiliary air supply port 25 formed of a small hole formed in the peripheral wall 3a of the inner housing 3 is also formed in the vicinity of the downstream side of the promoting member 10 of the peripheral wall 3a of the inner housing 3. .
- the auxiliary air supply port 25 is not an essential component, and the auxiliary air supply port 25 may not be formed.
- the peripheral wall 3a of the inner housing 3 is opened to a combustion space, which is a space located on the second end side (downstream side) of the promotion member 10 in the combustion chamber 30, and air is supplied to the combustion space.
- a second air supply port 28 is formed.
- the second air supply port 28 made up of a small hole drilled in a region separated by a predetermined distance from the promoting member 10 of the peripheral wall 3a of the inner housing 3 has the entire circumferential direction at predetermined intervals. A plurality of them are formed.
- the configuration of the second air supply port 28 (for example, the shape, size, arrangement, and the like of each opening) will be described in detail in another embodiment described later.
- the fuel When fuel is supplied to the impregnation member 8 from the fuel supply section through the fuel supply pipe 16, the fuel penetrates into the impregnation member 8.
- the fuel is supplied to the main surface 8b on the upstream side of the impregnation member 8 which is a smooth surface, so that the fuel can easily and smoothly penetrate into the impregnation member 8.
- the fuel evaporates from the impregnation member 8. Air is supplied to the combustion chamber 30 through the supply pipe 5 and the supply passage 4.
- the glow plug as the ignition device 22 is energized, and the tip of the glow plug is heated to a temperature sufficient to ignite the vapor of fuel evaporated from the impregnation member 8. Since the first air supply port 24 is at least partially opened in the ignition space communicating with the space 11 between the impregnation member 8 and the promotion member 10, the fuel vapor evaporated from the impregnation member 8 is ignited. A necessary amount of air is supplied to the ignition space. As a result, the fuel can be ignited faster and more easily than the evaporative burner according to the above-described prior art. Moreover, it is possible to prevent the life of the impregnating member 8 from being shortened due to unstable combustion.
- the fuel supplied from the fuel supply pipe 16 has a strong tendency to permeate and spread downward in the impregnation member 8 due to the action of gravity, and at least at the beginning of the infiltration, the evaporation of fuel from the impregnation member 8 is higher than the upper part. There are more down.
- the ignition device 22 is disposed so as to protrude upward in the ignition space from the peripheral wall 3a of the inner housing 3 below the center of the impregnation member 8 in the vertical direction, and its tip (heat generating portion). Is disposed below the center of the impregnating member 8 in the vertical direction.
- the fuel can be ignited more quickly and easily.
- the flame generated by the ignition of the fuel is directed upward, the fuel is ignited under the impregnation member 8 in this manner, so that the flame grows quickly over the entire main surface on the downstream side of the impregnation member 8. be able to.
- the ignition device 22 is arranged so that at least a part of the ignition device 22 is located inside the recess 8c. Therefore, since the distance between the surface of the impregnation member 8 that generates fuel vapor and the surface of the ignition device 22 can be reduced, the ignitability can be improved, and the ignition space can be reduced in size, It leads also to size reduction of the evaporation type burner 1.
- the promoting member 10 is disposed on the downstream side of the impregnating member 8, for example, the exhaust gas flowing in from the opening 2a on the downstream side and the air flowing into the combustion space of the combustion chamber 30 from the second air supply port 28.
- the temperature of the ignition device 22 can be prevented from being lowered or the flame once ignited can be prevented from being blown out, thereby improving the ignitability.
- the impregnated member 8 When the flame grows in this way, the impregnated member 8 is warmed and fuel evaporation is promoted.
- the accelerating member 10 is also heated by the flame, and the impregnating member 8 is also warmed by the radiant heat, thereby further promoting the evaporation of the fuel.
- the vapor of the fuel passes through the through hole of the accelerating member 10 and flows out into the combustion space of the combustion chamber 30.
- the fuel-air mixture containing the fuel vapor passes through the through-holes of the promoting member 10 or collides with the surface where the through-holes are not formed, so that the fuel concentration in the air-fuel mixture is made uniform, The combustion state can be made uniform.
- the fuel is supplied to the smooth surface formed on the surface on the first end portion side of the impregnation member, the fuel can be easily and uniformly penetrated into the impregnation member.
- the ignition device since at least a part of the ignition device is disposed inside the recess (or notch) formed in the region facing the ignition device of the impregnation member, heat from the ignition mechanism to the impregnation member is arranged. Transmission can be improved and the ignitability of the evaporative burner can be further improved. That is, the second problem described above can be solved.
- the structure of the promotion member 10 is not limited to the structure in which the through hole 10a and the long hole 10b as shown in FIGS. 1 and 2 are formed.
- a through hole 10c having the same shape (circular shape) and size may be formed over the entire surface of the promoting member 10, and as shown in FIG.
- the through-hole 10c having a circular shape and a size may be formed over the entire outer peripheral portion excluding the central portion of the promoting member 10.
- a plurality of arc-shaped long holes 10d centered on the center of the promoting member 10 may be provided at appropriate intervals in the circumferential direction, and such arc-shaped long holes 10d are provided in the radial direction. It may be formed in a plurality of stages. Further, as shown in FIG. 8, a large number of the long holes 10e are radially spaced over the entire surface of the outer peripheral portion excluding the central portion of the promoting member 10 with appropriate intervals in the circumferential direction (that is, the longitudinal direction of the long holes 10e is promoted). It may be formed so as to pass through the center of the member 10.
- the promotion members 10 are tilted so that a large number of the long holes 10 e are appropriately spaced in the circumferential direction and the longitudinal direction of the long holes 10 e and the radial direction of the promotion member 10 form a predetermined angle. You may form over the whole outer peripheral part except the center part. Moreover, you may form combining the through-hole which has a different shape and magnitude
- the promoting member 10 is formed as a plate, the space forming member 12 is disposed between the impregnating member 8 and the promoting member 10, and the space 11 is interposed therebetween. Formed.
- the method for forming the space with a gap between the impregnating member and the promoting member is not limited to the above. For example, a part of the promoting member is bent and brought into contact with the impregnating member. It may be formed.
- the center portion of the promoting member 35 is bent so that the upstream side is convex to form the contact portion 35 a, and the contact portion 35 a is downstream of the impregnation member 8. You may make it contact
- the outer peripheral portion of the promoting member 40 is bent upstream to provide a plurality of leg portions 40a, and notches 40b are formed between the leg portions 40a to form the leg portions 40a. May contact the main surface on the downstream side of the impregnating member 8. That is, the promoting member 10 and the space forming member 12 in the example illustrated in FIG. 2 may be integrally formed as the promoting member 40 having the leg portion 40a and the notch portion 40b.
- the space 11 may be divided into a plurality of sections by the promoting members 10, 35, 40, and the like.
- at least a part of the first air supply port needs to be configured to open at least in a section including a space where the ignition device 22 is exposed.
- the promotion member when the promotion member is brought into contact with the impregnation member to form a space between the impregnation member and the promotion member as in the promotion members 35 and 40 according to the modified example 2, the impregnation member is changed from the promotion member heated by the flame. Heat conduction to the fuel can be promoted, and evaporation of fuel from the impregnated member can be further promoted. Furthermore, since the space forming member 12 can be omitted, the manufacturing cost can be reduced.
- Example 1 As shown in FIG. 3, the recessed part 8c opened to the outer side and the downstream side of the radial direction of the impregnation member 8 was formed.
- the configuration of the recess 8 c is not particularly limited as long as at least a part of the ignition device 22 is accommodated.
- a notch 32 may be formed that opens in three directions, ie, the radially outer side, the downstream side, and the upstream side of the impregnation member 8.
- Example 1 and Modification 1 described above the main surface on the downstream side other than the step 8a and the recess 8c or the notch 32 of the impregnation member 8 is formed in a planar shape, but the main surface on the downstream side of the impregnation member 8 is It is not always necessary to have a planar shape, and for example, unevenness may be formed.
- a convex portion 37 protruding downstream as shown in FIG. 14 may be provided, or a concave portion 38 opening downstream may be provided as shown in FIG.
- the main surface 8b on the upstream side of the impregnating member 8 also needs to have at least a portion to which fuel is supplied as a smooth surface. For example, for the purpose of engagement with other members, Unevenness etc. may be formed.
- Example 1 and Modifications 1 and 2 described above the recess 8c or notch 32 of the impregnation member 8 and the ignition device 22 are provided one by one.
- the ignition device is disposed so as to protrude upward in the ignition space from the peripheral wall of the inner housing below the center in the vertical direction of the impregnation member in the state where the evaporation burner according to the present invention is used, As long as the front end portion of the ignition device is disposed below the center of the impregnation member in the vertical direction and at least a part of the ignition device is accommodated in the recess or notch, the number thereof is 2. There may be two or more.
- a total of two recesses 8c are provided at each of the lower end portion and the side portion of the impregnation member 8, and at least one of the front end portions of the ignition device 22 is provided inside the two recesses 8c. You may comprise so that a part may be located.
- the ignitability of the evaporative burner is improved by supplying an amount of air suitable for the ignition of fuel by the ignition device to the vicinity of the ignition device.
- the first problem of improving and extending the life of the wick, and the ignitability of the evaporative burner by improving the heat transfer from the ignition mechanism to the wick while avoiding the difficulty of fuel penetration into the wick The second problem of improving the resolution can be solved at the same time.
- the evaporative burner 1a according to Embodiment 2 of the present invention described below aims to solve the third problem of reducing air shortage that causes incomplete combustion of fuel on the downstream side of the combustion chamber. To do.
- the flow rate of air supplied to the combustion space of the combustion chamber 30 via the second air supply port 28 is second than the first end side (upstream side) of the second air supply port 28. It is configured so that the end side (downstream side) is larger.
- the evaporative burner 1a is the same as the evaporative burner 1 described above. Therefore, in the following description, this point will be described.
- FIG. 2 is referred as needed.
- the second air supply port 28 is configured by one or both of an air supply opening array that is at least one array of a plurality of openings and an air supply slit that is at least one slit.
- the air supply opening array is at least one of a plurality of openings formed at predetermined intervals from the upstream side to the downstream side in a predetermined region of the peripheral wall 3a of the inner housing 3 that defines the combustion space of the combustion chamber 30. Is an array.
- the air supply slit is at least one slit formed with a predetermined width and a predetermined length from the upstream side to the downstream side in a predetermined region of the peripheral wall 3a of the inner housing 3 that defines the combustion space of the combustion chamber 30. is there.
- the second air supply port 28 is configured by an air supply opening array 29 which is a plurality of arrays of a plurality of openings 29a. More specifically, as shown in FIG. 17, the plurality of openings 29a constituting each air supply opening array 29 gradually increase as the opening area of each opening 29a goes from the upstream side to the downstream side. It is configured as follows. Thereby, the flow rate of the air supplied to the combustion space of the combustion chamber 30 via the second air supply port 28 can be made larger on the downstream side than on the upstream side. FIG.
- FIG 17 shows an air supply opening array 29 configured as a second air supply port 28 formed in the peripheral wall 3a of the inner housing 3 of the evaporative burner 1a in a state where the peripheral wall 3a is developed in a planar shape. It is a schematic diagram (two-dimensional view).
- the longitudinal direction of the air supply opening array 29 (broken arrow) and the direction parallel to the axis of the inner housing 3 (solid arrow) are at a predetermined angle.
- the air supply opening array 29 is configured to form ( ⁇ ). That is, the plurality of openings 29 a constituting each air supply opening array 29 are arranged so as to draw a spiral with the central axis of the inner housing 3 as an axis. Thereby, a swirl flow is generated in the combustion chamber 30 and the continuity and uniformity of combustion in the combustion chamber 30 can be improved.
- the outer housing 2 disposed on the outer periphery of the inner housing 3 and the third air supply that is an opening formed in the peripheral wall of the outer housing 2 And an air supply pipe 5 for supplying air into the outer housing 2 through the mouth.
- An air supply passage 4 is formed between the peripheral wall of the outer housing 2 and the peripheral wall 3a of the inner housing 3, and is a space in which both ends on the upstream side and the downstream side are closed. It is formed downstream of the two air supply ports 28. More specifically, a third air supply port is formed further downstream than the opening 29a located on the most downstream side among the plurality of openings 29a constituting the air supply opening array 29. Thereby, the flow rate of the air supplied to the combustion space of the combustion chamber 30 via the second air supply port 28 can be made larger on the downstream side than on the upstream side.
- the plurality of openings 29a constituting each supply opening array 29 are arranged so as to form a spiral with the central axis of the inner housing 3 as an axis.
- a swirl flow can be generated to improve the continuity and uniformity of combustion in the combustion chamber 30.
- the second air supply port 28 has one or both of an air supply opening array that is at least one array of a plurality of openings and an air supply slit that is at least one slit. Consists of.
- the width of the air supply slit 36 is gradually increased from the upstream side toward the downstream side as shown in FIG. do it. Thereby, the flow rate of the air supplied to the combustion space of the combustion chamber 30 via the second air supply port 28 can be made larger on the downstream side than on the upstream side.
- 20 is a schematic view showing an air supply slit 36 configured as the second air supply port 28 formed in the peripheral wall 3a of the inner housing 3 of the evaporative burner 1a in a state where the peripheral wall 3a is developed in a planar shape. It is a figure (two-dimensional view).
- the longitudinal direction of the air supply slit 36 (broken arrow) and the direction parallel to the axis of the inner housing 3 (solid arrow) are at a predetermined angle (
- the air supply slit 36 may be configured to form ⁇ ). That is, the air supply slit 36 constituting the second air supply port 28 is arranged so as to draw a spiral with the central axis of the inner housing 3 as an axis. Thereby, a swirl flow is generated in the combustion chamber 30 and the continuity and uniformity of combustion in the combustion chamber 30 can be improved.
- the second air supply port 28 may be configured by a combination of the air supply opening array 29 and the air supply slit 36.
- the air supply opening array 29 has an angle ( ⁇ ) formed by the longitudinal direction of the air supply opening array 29 and the direction parallel to the axis of the inner housing 3. You may comprise so that it may change as it goes to the downstream from the upstream. Specifically, for example, the angle ⁇ may be gradually increased from the upstream side to the downstream side as shown in FIG. 18, and conversely, as shown in FIG. You may make it the said angle (theta) become small gradually as it goes to.
- 18 and 19 show the air supply opening array 29 configured as the second air supply port 28 formed in the peripheral wall 3a of the inner housing 3 of the evaporative burner 1a according to this modification, and the peripheral wall 3a is planar. It is a schematic diagram (two-dimensional view) shown in the state expanded in the shape.
- the air supply slit 36 has an upstream angle ( ⁇ ) formed by the longitudinal direction of the air supply slit 36 and the direction parallel to the axis of the inner housing 3. You may comprise so that it may change as it goes to the downstream from the side. Specifically, for example, the angle ⁇ may be gradually increased from the upstream side to the downstream side as shown in FIG. 21, and conversely, as shown in FIG. You may make it the said angle (theta) become small gradually as it goes to.
- 21 and 22 show an air supply slit 36 formed as a second air supply port 28 formed in the peripheral wall 3a of the inner housing 3 of the evaporative burner 1a according to this modification, and the peripheral wall 3a is planar. It is the schematic diagram (two-dimensional view) shown in the state expand
- the strength of the swirling flow and / or the distribution of the strength of the swirling flow in the combustion chamber 30 can be controlled.
- an accelerating member having a flat (plate-like) shape as a whole is used except for a partial bent portion.
- the promotion member may be deformed (thermally deformed) due to a temperature change caused by fuel combustion. Therefore, in the third embodiment of the present invention, the rigidity (section modulus) of the promotion member is increased to reduce the thermal deformation of the promotion member accompanying the combustion of fuel.
- the promotion member 50 is configured by a plate-like member having a curved surface shape whose central portion is convex on the upstream side.
- the impregnating member 48 is also constituted by a plate-like member having a curved surface shape whose central portion is convex on the upstream side. Except for these points, the evaporative burner 1b has the same configuration as that of the evaporative burner 1 described above and operates in the same manner. Therefore, in the following description, the description will be made focusing on these points.
- the promotion member 50 is constituted by a plate-like member having a curved surface shape whose central portion is convex on the upstream side (first end portion side). ), The rigidity (section modulus) of the acceleration member 50 is increased, and deformation (thermal deformation) of the acceleration member 50 due to temperature change accompanying fuel combustion can be reduced. Further, when thermal deformation of the accelerating member occurs, the flat plate-shaped accelerating member has a curved surface shape, whereas the degree of thermal deformation is large and it is difficult to specify the location and / or direction of occurrence of the thermal deformation. In the accelerating member 50, the degree of thermal deformation is small, and it is easy to specify the location and / or direction of thermal deformation.
- the impregnating member 48 is also composed of a plate-like member having a curved surface whose central portion is convex on the upstream side (first end portion side). Therefore, the increase in the distance between the promotion member 50 and the impregnation member 48 due to the configuration of the promotion member 50 by the plate-like member having the curved surface shape as described above is reduced, and the acceleration member 50 is reduced from the acceleration member 50 during the combustion of the fuel. A decrease in the transmission of radiant heat to the impregnation member 48 can be suppressed. As a result, it is possible to reduce a decrease in the amount of fuel vapor generated from the impregnation member 48 during fuel combustion.
- the impregnated member 48 is supplied from the fuel supply pipe 16 as compared with the flat impregnated member as shown in FIGS. 24A and 24B.
- the fuel can penetrate smoothly along the curved surface of the impregnation member 48 and can easily spread inside the impregnation member 48.
- the promotion member 55 includes a protrusion 55a that is a portion extending upstream, and the protrusion 55a is the impregnation member 49. Touching. More specifically, in the evaporative burner 1 c, the protruding portion 55 a is a ridge formed so as to protrude upstream from a part of the promotion member 55, and this ridge is formed on the downstream side of the impregnation member 49. The impregnated member 49 is in contact with the recessed portion 49a.
- a promotion member 57 is constituted by a plurality of promotion elements 56 that are constituent elements.
- Each of the promoting elements 56 includes a main portion 56a that is a portion having a plate-like shape, and a support portion 56b that is a portion having a columnar shape extending in the normal direction of the main portion 56a.
- the individual promoting elements 56 are independently fixed at predetermined positions by inserting the support portions 56 b into the impregnation member 10.
- through holes are formed in the promotion member 57 by gaps between the main portions 56 a included in the plurality of promotion elements 56.
- the promotion member 57 is constituted by a plurality of promotion elements 56 that are fixed to a predetermined position independently of each other by inserting each support portion 56b into the impregnation member 10. Since the thermal deformation of each promotion element 56 is small, the thermal deformation of the promotion member 57 as a whole due to the combustion of fuel can be reduced.
- each support portion 56b is inserted into the impregnation member 10, heat conduction from the promotion member 57 (the promotion element 56) heated by the flame during combustion of the fuel to the impregnation member 10 is promoted, and the impregnation is performed.
- the evaporation of fuel from the member 10 can be promoted.
- the space forming member 12 described above can be omitted, the manufacturing cost of the evaporative burner 1d can be reduced.
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Abstract
Description
上述した第1の課題に鑑み、本発明の第1の側面に係る蒸発式バーナ(以降、「第1バーナ」と称される場合がある。)は、燃焼室と、含浸部材と、燃料供給部と、着火装置と、を備える。
次に、上述した第2の課題に鑑み、本発明の第2の側面に係る蒸発式バーナ(以降、「第2バーナ」と称される場合がある。)は、上述した第1バーナであって、前記燃料供給部は、前記含浸部材の前記第1端部側の表面に形成された平滑面に対して前記燃料を供給するように構成されている。更に、前記含浸部材の前記着火装置に対向する領域には凹部又は切り欠きが形成されており、且つ、前記着火装置は、その少なくとも一部が前記凹部又は前記切り欠きの内部に位置するように配設されている。
次に、上述した第3の課題に鑑み、本発明の第3の側面に係る蒸発式バーナ(以降、「第3バーナ」と称される場合がある。)は、上述した第1バーナ又は第2バーナであって、前記第2給気口は、給気開口配列及び給気スリットの何れか一方又は両方によって構成されている。
次に、本発明の第4の側面に係る蒸発式バーナ(以降、「第4バーナ」と称される場合がある。)は、上述した第1バーナ乃至第3バーナであって、前記促進部材は、その中央部が前記第1端部側に凸となる曲面形状を有する板状の部材によって構成されており、前記含浸部材もまた、その中央部が前記第1端部側に凸となる曲面形状を有する板状の部材によって構成されている。
次に、本発明の第5の側面に係る蒸発式バーナ(以降、「第5バーナ」と称される場合がある。)は、上述した第1バーナ乃至第3バーナであって、前記促進部材は、前記第1端部側に延在する部分である突出部を備え、前記突出部は、前記含浸部材に接触している。
次に、本発明の第6の側面に係る蒸発式バーナ(以降、「第6バーナ」と称される場合がある。)は、上述した第1バーナ乃至第3バーナであって、前記促進部材は、複数の構成要素である促進要素によって構成されている。
次に、本発明の第7の側面に係る蒸発式バーナ(以降、「第7バーナ」と称される場合がある。)は、上述した第1バーナ乃至第6バーナであって、前記含浸部材は、毛細管構造及び/又は多孔質構造を有する部材からなる複数の層を含む積層体によって構成されており、前記含浸部材を構成する前記複数の層のうち、前記第1端部側に露出している層の目の粗さは、前記第2端部側に露出している層の目の粗さよりも細かい。
図1は、本発明の実施例1に係る蒸発式バーナ1を下流側から観察した様子を示す模式図である。図2は、図1のA-A線断面図である。以下の説明においては、蒸発式バーナ1が使用される状態(例えば、車両に搭載される状態等)における鉛直方向上側(図1及び図2の紙面の上側)を「上方」、その反対側である下側を「下方」とする。更に、図2の紙面に向かって左側を「上流側」、その反対側である右側を「下流側」とする。
以下、蒸発式バーナ1の作動について説明する。
以上説明してきたように、蒸発式バーナ1によれば、着火装置による燃料の着火に好適な量の空気を、第1給気口を介して着火装置の近傍に供給することができる。その結果、蒸発式バーナの着火性を向上させると共にウィックの寿命を延ばすことができる。即ち、前述した第1の課題を解決することができる。
〈促進部材の変形例1〉
促進部材10の構成は、図1及び図2に示したような貫通孔10a及び長孔10bが形成された構成に限定されない。例えば、図5に示すように同一の形状(真円状)及び大きさを有する貫通孔10cを促進部材10の全面に亘って形成してもよく、図6に示すように同一の形状(真円状)及び大きさを有する貫通孔10cを促進部材10の中央部を除く外周部の全面に亘って形成してもよい。
図2に示した例においては、上述したように、促進部材10をプレートとして形成し、含浸部材8と促進部材10との間に空間形成部材12を配設して、これらの間に空間11を形成させた。しかしながら、含浸部材と促進部材との間の間隔を空けて空間を形成させるための手法は上記に限定されず、例えば、促進部材の一部を屈曲させて含浸部材に当接させることにより空間を形成させてもよい。
以上説明してきた促進部材の各種変形例の何れにおいても、上述した実施例1と同様の作用及び効果を奏することができる。
実施例1においては、図3に示したように、含浸部材8の径方向の外側と下流側とに開口する凹部8cを形成した。しかしながら、上述したように、凹部8cの構成は、着火装置22の少なくとも一部を収容する限り、特に限定されない。例えば、図13に示すように、含浸部材8の径方向の外側と下流側と上流側との3方向に開口する切り欠き32を形成してもよい。
実施例1及び上記変形例1においては、含浸部材8の段部8a及び凹部8c又は切り欠き32以外の下流側の主面を平面状に形成したが、含浸部材8の下流側の主面は必ずしも平面状である必要は無く、例えば凹凸等が形成されていてもよい。例えば、図14に示すように下流側に突出する凸部37を設けてもよく、或いは図15に示すように下流側に開口する凹部38を設けてもよい。
実施例1並びに上記変形例1及び2においては、含浸部材8の凹部8c又は切り欠き32と着火装置22とをそれぞれ1つずつ設けた。しかしながら、本発明に係る蒸発式バーナが使用される状態において含浸部材の上下方向の中央よりも下側の内側ハウジングの周壁から着火空間において上方に向かって突出するように着火装置が配設され、着火装置の先端部が含浸部材の上下方向の中央よりも下側に位置するように配設され、且つ凹部又は切り欠きの内部に着火装置の少なくとも一部を収容する限り、それらの数は2つ以上の複数個であってもよい。
以上説明してきた含浸部材の各種変形例の何れにおいても、上述した実施例1と同様の作用及び効果を奏することができる。
蒸発式バーナ1aは、第2給気口28を介して燃焼室30の燃焼空間に供給される空気の流量が、第2給気口28の第1端部側(上流側)よりも第2端部側(下流側)の方が大きいように構成されていることを特徴とする。この点を除き、蒸発式バーナ1aは、上述した蒸発式バーナ1と同様であるので、以下の説明においては、この点に着目して説明する。また、蒸発式バーナ1aの当該特徴は、上述した蒸発式バーナ1に関する説明において参照した図2にも描かれているので、以下の説明においては、必要に応じて図2を参照する。
以上説明してきたように、蒸発式バーナ1aによれば、第2給気口28を介して燃焼室30の燃焼空間に供給される空気の流量を上流側よりも下流側の方が大きいようにすることができる。その結果、燃焼室30の下流側における燃料の不完全燃焼の原因となる空気不足を低減することができる。即ち、前述した第3の課題を解決することができる。
〈第2給気口の変形例1〉
上述したように、蒸発式バーナ1aにおいて、第2給気口28は、複数の開口部の少なくとも1つの配列である給気開口配列及び少なくとも1つのスリットである給気スリットの何れか一方又は両方によって構成される。少なくとも1つの給気スリットによって第2給気口28を構成する場合は、図20に示すように、給気スリット36の幅を、上流側から下流側へと向かうほど徐々に大きくなるように構成すればよい。これにより、第2給気口28を介して燃焼室30の燃焼空間に供給される空気の流量を上流側よりも下流側の方が大きいようにすることができる。尚、図20は、蒸発式バーナ1aの内側ハウジング3の周壁3aに形成された第2給気口28として構成された給気スリット36を、周壁3aを平面状に展開した状態にて示す模式図(二次元視)である。
上述したように、給気開口配列29及び/又は給気スリット36の長手方向と内側ハウジング3の軸に平行な方向とが所定の角度をなすように第2給気口28を構成することにより、燃焼室30内に旋回流を生じさせ、燃焼室30内における燃焼の連続性及び均一性を向上させることができる。この場合、内側ハウジング3の中心軸を軸とする第2給気口28の螺旋構造における位相(割出し)の大きさを燃焼室30内において変化させてもよい。
図23に示すように、本発明の実施例3に係る蒸発式バーナ1bにおいては、促進部材50は、その中央部が上流側に凸となる曲面形状を有する板状の部材によって構成されている。更に、含浸部材48もまた、その中央部が上流側に凸となる曲面形状を有する板状の部材によって構成されている。これらの点を除き、蒸発式バーナ1bは、上述した蒸発式バーナ1と同様の構成を有し、同様に作動するので、以下の説明においては、これらの点に着目して説明する。
蒸発式バーナ1bによれば、促進部材50は、その中央部が上流側(第1端部側)に凸となる曲面形状を有する板状の部材によって構成されているので、平板状(プレート状)の促進部材と比べて、促進部材50の剛性(断面係数)が高まり、燃料の燃焼に伴う温度変化に起因する促進部材50の変形(熱変形)を低減することができる。また、促進部材の熱変形が発生した場合、平板状の促進部材においては熱変形の程度が大きく且つ熱変形の発生部位及び/又は発生方向の特定が困難であるのに対し、曲面形状を有する促進部材50においては、熱変形の程度が小さく且つ熱変形の発生部位及び/又は発生方向の特定が容易である。
上述した本発明の実施例1の変形例2に係る促進部材35及び40のように促進部材を含浸部材に当接させて含浸部材と促進部材との間に空間を形成する場合、火炎によって加熱された促進部材から含浸部材への熱伝導が促進され、含浸部材からの燃料の蒸発を更に促進させることができる。
蒸発式バーナ1cによれば、燃料の燃焼時に火炎によって加熱された促進部材55から含浸部材49への熱伝導が促進され、含浸部材49からの燃料の蒸発を促進させることができる。更に、前述した空間形成部材12を省略することができるので蒸発式バーナ1cの製造コストの削減にも繋がる。
本発明の実施例5に係る蒸発式バーナ1dにおいては、図27に示すように、複数の構成要素である促進要素56によって促進部材57が構成されている。個々の促進要素56は、板状の形状を有する部分である主部56aと、主部56aの法線方向に延在する柱状の形状を有する部分である支持部56bと、を備える。更に、個々の促進要素56は、支持部56bが含浸部材10に挿入されることにより、所定の位置にそれぞれ独立に固定されている。加えて、複数の促進要素56が備える主部56a同士の間の空隙により、促進部材57に貫通孔が形成されている。
蒸発式バーナ1dにおいて、促進部材57は、各々の支持部56bが含浸部材10に挿入されることにより互いに独立して所定の位置に固定された複数の促進要素56によって構成されている。個々の促進要素56の熱変形は小さいので、燃料の燃焼に伴う促進部材57全体としての熱変形を低減することができる。
Claims (14)
- 底壁と周壁とからなる有底筒状の容器である内側ハウジングによって画定される空間である燃焼室と、
前記燃焼室における前記内側ハウジングの前記底壁側の端部である第1端部に配設され且つ毛細管構造及び/又は多孔質構造を有する部材である含浸部材と、
前記含浸部材に燃料を供給して前記含浸部材に前記燃料を含浸させる燃料供給部と、
前記含浸部材から蒸発する前記燃料の蒸気を加熱して着火させる着火装置と、
を備える蒸発式バーナであって、
前記燃焼室内において前記含浸部材よりも前記燃焼室の前記第1端部とは反対側の端部である第2端部側に前記含浸部材と所定の間隔を空けて配設され且つ多数の貫通孔が形成された部材である促進部材を更に備え、
前記着火装置は、前記燃焼室において前記促進部材よりも前記第1端部側に位置する空間である着火空間に露出するように配設されており、
前記着火空間に少なくとも一部が開口し且つ前記着火空間に空気を供給する第1給気口と、前記燃焼室において前記促進部材よりも前記第2端部側に位置する空間である燃焼空間に開口し且つ当該燃焼空間に空気を供給する第2給気口と、が前記内側ハウジングの前記周壁に形成されている、
蒸発式バーナ。 - 請求項1に記載の蒸発式バーナにおいて、
前記着火装置は、前記蒸発式バーナが使用される状態における前記含浸部材の上下方向の中央よりも下側の前記内側ハウジングの前記周壁から前記着火空間において上方に向かって突出するように配設されている、
蒸発式バーナ。 - 請求項2に記載の蒸発式バーナにおいて、
前記着火装置の先端部は、前記蒸発式バーナが使用される状態における前記含浸部材の上下方向の中央よりも下側に位置するように配設されている、
蒸発式バーナ。 - 請求項1乃至3の何れか1項に記載の蒸発式バーナであって、
前記燃料供給部は、前記含浸部材の前記第1端部側の表面に形成された平滑面に対して前記燃料を供給するように構成されており、
前記含浸部材の前記着火装置に対向する領域には凹部又は切り欠きが形成されており、
前記着火装置は、その少なくとも一部が前記凹部又は前記切り欠きの内部に位置するように配設されている、
蒸発式バーナ。 - 請求項1乃至4の何れか1項に記載の蒸発式バーナであって、
前記第2給気口は、前記燃焼空間を画定する前記内側ハウジングの前記周壁の所定の領域において前記第1端部側から前記第2端部側へと所定の間隔を空けて形成された複数の開口部の少なくとも1つの配列である給気開口配列及び前記燃焼空間を画定する前記内側ハウジングの前記周壁の所定の領域において前記第1端部側から前記第2端部側へと所定の幅及び所定の長さにて形成された少なくとも1つのスリットである給気スリットの何れか一方又は両方によって構成されており、
前記第2給気口を介して前記燃焼空間に供給される空気の流量は、前記第2給気口の前記第1端部側よりも前記第2端部側の方が大きいように構成されている、
蒸発式バーナ。 - 請求項5に記載の蒸発式バーナにおいて、
前記給気開口配列を構成する前記複数の開口部は、各々の開口部の開口面積が前記第1端部側から前記第2端部側へと向かうほど徐々に大きくなるように構成されており、
前記給気スリットの幅は、前記第1端部側から前記第2端部側へと向かうほど徐々に大きくなるように構成されている、
蒸発式バーナ。 - 請求項5又は請求項6に記載の蒸発式バーナにおいて、
前記給気開口配列は、前記給気開口配列の長手方向と前記内側ハウジングの軸に平行な方向とが所定の角度をなすように構成されており、
前記給気スリットは、前記給気スリットの長手方向と前記内側ハウジングの軸に平行な方向とが所定の角度をなすように構成されている、
蒸発式バーナ。 - 請求項7に記載の蒸発式バーナにおいて、
前記給気開口配列は、前記給気開口配列の長手方向と前記内側ハウジングの軸に平行な方向とがなす角度が前記第1端部側から前記第2端部側へと向かうにつれて変化するように構成されており、
前記給気スリットは、前記給気スリットの長手方向と前記内側ハウジングの軸に平行な方向とがなす角度が前記第1端部側から前記第2端部側へと向かうにつれて変化するように構成されている、
蒸発式バーナ。 - 請求項5乃至請求項8の何れか1項に記載の蒸発式バーナであって、
前記内側ハウジングの外周に配設された外側ハウジングと、
前記外側ハウジングの周壁に形成された開口部である第3給気口を介して前記外側ハウジング内に空気を供給する給気管と、
を更に備え、
前記外側ハウジングの周壁と前記内側ハウジングの前記周壁との間には、前記第1端部側及び前記第2端部側の両端が閉じられた空間である給気通路が形成されており、
前記第3給気口は、前記第2給気口よりも前記第2端部側に形成されている、
蒸発式バーナ。 - 請求項1乃至請求項9の何れか1項に記載の蒸発式バーナであって、
前記促進部材は、その中央部が前記第1端部側に凸となる曲面形状を有する板状の部材によって構成されており、
前記含浸部材もまた、その中央部が前記第1端部側に凸となる曲面形状を有する板状の部材によって構成されている、
蒸発式バーナ。 - 請求項1乃至請求項9の何れか1項に記載の蒸発式バーナであって、
前記促進部材は、前記第1端部側に延在する部分である突出部を備え、
前記突出部は、前記含浸部材に接触している、
蒸発式バーナ。 - 請求項11に記載の蒸発式バーナであって、
前記突出部は、前記促進部材の一部において前記第1端部側に凸となるように形成された隆起であり、
前記隆起は、前記含浸部材の前記第2端部側に形成された凹部に嵌合することにより、前記含浸部材に接触している、
蒸発式バーナ。 - 請求項1乃至請求項9の何れか1項に記載の蒸発式バーナであって、
前記促進部材は、複数の構成要素である促進要素によって構成されており、
個々の前記促進要素は、板状の形状を有する部分である主部と、前記主部の法線方向に延在する柱状の形状を有する部分である支持部と、を備え、且つ、前記支持部が前記含浸部材に挿入されることにより所定の位置にそれぞれ独立に固定されており、
前記複数の前記促進要素が備える前記主部同士の間の空隙によって前記促進部材の前記貫通孔が形成されている、
蒸発式バーナ。 - 請求項1乃至請求項13の何れか1項に記載の蒸発式バーナであって、
前記含浸部材は、毛細管構造及び/又は多孔質構造を有する部材からなる複数の層を含む積層体によって構成されており、
前記含浸部材を構成する前記複数の層のうち、前記第1端部側に露出している層の目の粗さは、前記第2端部側に露出している層の目の粗さよりも細かい、
蒸発式バーナ。
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JP2003090512A (ja) * | 2001-06-26 | 2003-03-28 | J Eberspaesher Gmbh & Co Kg | 蒸発式バーナ |
JP2003042409A (ja) * | 2001-08-01 | 2003-02-13 | Denso Corp | 燃焼器 |
JP2003302009A (ja) * | 2002-03-07 | 2003-10-24 | J Eberspaesher Gmbh & Co Kg | 蒸発式バーナに用いられる蒸発用エレメント |
JP2004037013A (ja) * | 2002-07-04 | 2004-02-05 | Denso Corp | 燃焼式ヒータ |
EP1744099A1 (de) * | 2005-07-14 | 2007-01-17 | J. Eberspächer GmbH Co. KG | Verdampferbaugruppe, insbesondere für ein Fahrzeugheizgerät |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018100843A1 (ja) * | 2016-12-01 | 2018-06-07 | 株式会社三五 | 蒸発式バーナ |
US10941935B2 (en) | 2016-12-01 | 2021-03-09 | Sango Co., Ltd. | Evaporation type burner |
EP3480519A1 (de) * | 2017-11-06 | 2019-05-08 | Eberspächer Climate Control Systems GmbH & Co. KG. | Fahrzeugheizgerät |
US11104206B2 (en) | 2017-11-06 | 2021-08-31 | Eberspächer Climate Control Systems GmbH | Vehicle heater |
US11345214B2 (en) * | 2018-08-17 | 2022-05-31 | Eberspächer Climate Control Systems GmbH | Vehicle heater |
Also Published As
Publication number | Publication date |
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JPWO2016195046A1 (ja) | 2018-03-22 |
JP6681392B2 (ja) | 2020-04-15 |
KR20180014712A (ko) | 2018-02-09 |
US20180094806A1 (en) | 2018-04-05 |
CN107614975A (zh) | 2018-01-19 |
US10684008B2 (en) | 2020-06-16 |
CN107614975B (zh) | 2019-09-10 |
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