JP2002048307A - Fuel burning heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel burning heater wherein fuel and air are sufficiently mixed to obtain a uniformed air-fuel ratio even in a small size combustion chamber, and thus high combustion efficiency and exhaust emission can be achieved. SOLUTION: A fuel vaporization means, such as a wick 9, is provided to the bottom of a first combustion cylinder 8 wherein a first combustion chamber 11 is defined. Combustion air is flowed from a swirling air chamber 12 which is formed outside the cylindrical surface of the combustion cylinder 8 to the combustion chamber 11 so that a swirling flow is formed around the central axis. For this purpose, air supply ports 20 each having a cut-and-raised guide 21 are formed. The combustion chamber 11 is connected to a second combustion chamber 14 through a partition wall 7 having a throttled opening 7a. The partition wall may be provided with notches to cause swirling flow onto passing combustion gas or the like. Combustion is substantially completed in the combustion chamber 11 while thermal load imposed on the inner wall surface of the combustion chamber 11 is reduced because of the swirling flow of the air, and thus the size of the combustion chamber and the entire fuel burning heater can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion type heating device for heating a fluid to be heated by burning fuel, and particularly to a combustion type heating device suitable for vehicle air conditioning, which is compact and has excellent combustion efficiency and exhaust emission characteristics. The present invention relates to a heating device and a combustion method that can be used for the heating device.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 2000-74333 discloses that
A plurality of projections are provided in a staggered pattern on the outer peripheral surface of the combustion cylinder through which the high-temperature combustion gas flows, and each projection is directed along the axial direction of the combustion cylinder and downstream of the cooling gas flow. A cooling structure for a combustion cylinder is disclosed in which a cooling gas passage extending inclining so as to approach the axis of the combustion cylinder is formed. In this combustion cylinder, cooling air is introduced into the combustion cylinder from the cooling gas passage of each projection and flows along the inner peripheral surface of the combustion cylinder, so that the combustion flowing in contact with the inner peripheral surface of the combustion cylinder The temperature of the gas can be reduced, thereby protecting the combustion tube from hot combustion gases.

The center line of the cooling gas passage formed in the projection of the combustion cylinder in the above-mentioned prior art is inclined so as to intersect with the center axis of the combustion cylinder on the downstream side, and substantially aligns the center axis of the combustion cylinder. Since it is considered that the cooling air flows into the combustion cylinder through the cooling gas passage, no swirling motion is applied to the cooling air flowing through the cooling gas passage. The air flows smoothly downstream along the central axis of the combustion tube. Therefore, when the size of the combustion cylinder is reduced for vehicle air conditioning, the fuel and air are not sufficiently mixed in the combustion cylinder, and the air-fuel ratio, which is the mixing ratio of fuel and air, is partially increased in the combustion cylinder. Therefore, there is a problem that the combustion efficiency is reduced due to the non-uniformity, and the exhaust emission characteristics are also deteriorated.

[0004]

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problems in the prior art, and allows the fuel and air vaporized in the combustion chamber, which is the internal space of the combustion cylinder, to be sufficiently mixed, and When the air-fuel ratio in the room becomes uniform, good combustion is performed, and even in a small combustion chamber, vaporized fuel can be completely burned, and as a result, combustion efficiency and exhaust emission characteristics can be improved. It is another object of the present invention to provide a small-sized combustion heating device suitable for vehicle air conditioning. The present invention also provides a combustion type heating device in which the wall surface of a combustion cylinder is sufficiently cooled by combustion air supplied to a combustion chamber inside the combustion cylinder, thereby improving the durability of the entire system including the combustion cylinder. It is intended to provide.

[0005]

According to the present invention, there is provided a method for solving the above-mentioned problems.
The present invention provides a combustion-type heating device described in (1). In this combustion type heating device, fuel vaporization means is provided at the bottom of a cylindrical first combustion cylinder that forms a first combustion chamber inside,
The fuel is supplied to the fuel vaporization means by the fuel supply means and vaporized. The fuel vaporizing means can be constituted by, for example, a porous wick capable of penetrating the liquid fuel to the surface. A plurality of air supply ports are formed in the cylindrical surface of the first combustion cylinder, and air for combustion passes through the air supply port from the air chamber formed outside the first combustion cylinder into the first combustion chamber. At this time, the combustion air is supplied so as to form a swirling flow swirling in a fixed rotational direction about the central axis of the first combustion cylinder.

[0006] As a result, a swirling flow of air is generated in the first combustion chamber, and the inner wall surface of the first combustion cylinder is completely covered by a part of the swirling air, so that the combustion gas directly flows into the first combustion cylinder. The first, the hottest, is prevented from contacting the wall.
The heat load on the inner wall surface of the combustion cylinder and the partition having the throttle opening is reduced. Further, since a negative pressure is generated in the first combustion chamber by the swirling flow of air, the action of the fuel vaporizing means is enhanced, and the vaporized fuel is easily diffused and mixed into the swirling air vortex. The mixture thus produced, or the combustion gas in the process of burning it, is relatively long
Since the fuel and air in the air-fuel mixture are uniformly mixed and completely burned during this time while being swirled in the combustion chamber, an air supply port is provided in the subsequent second combustion cylinder to provide the air in the second combustion chamber. There is no need to continue the main combustion. Accordingly, the combustion efficiency and exhaust emission characteristics both increase, although the first combustion cylinder and the second combustion cylinder, and thus the entire heating device can be reduced in size.

In the combustion type heating device of the present invention, the first
A spiral flow straightening plate for guiding air into the air chamber outside the cylindrical surface of the combustion cylinder can be provided. As a result, since the air is forced to form a swirling flow while flowing through the air chamber before flowing into the first combustion chamber, a stronger swirling flow at a higher speed is generated when the air flows into the first combustion chamber. In the combustion type heating device of the present invention, a partition plate for partitioning a front surface of an air chamber formed outside the first combustion cylinder is provided, and the partition plate is provided with a partition for combustion from another air chamber on the upstream side. Another air supply port for introducing air can be provided, and the air supply port can form a swirl flow in the air chamber in the same rotational direction as the swirl flow of air in the first combustion chamber.
Thereby, the swirling flow of the air in the first combustion chamber is further strengthened.

[0008] In this case, at least a part of the plurality of air supply ports for the air flowing into the first combustion chamber or the air chamber is simply cut and raised on the cylindrical surface of the first combustion cylinder or a part of the partition plate. Thus, the air supply port and the air guide can be formed at once. As a result, the tongue piece generated when the air supply port is punched is used as it is as an air guide, and acts to guide the passing air into a swirling flow, so that there is no need to provide a separate guide, and there is no need to provide a separate guide. In one process, the air supply port and the guide are formed simultaneously.

In the combustion type heating apparatus of the present invention, an air supply pipe for supplying combustion air to the other air chamber can be connected to the housing in a tangential direction. Thereby, the combustion air flowing into the other air chamber can be swirled in the same rotational direction as the swirling flow of the air swirling in the first combustion chamber, so that it passes through the air supply port of the partition plate. The combustion air flowing into the air chamber can be made into a swirl flow in advance, and the swirl flow of the air in the first combustion chamber can be further strengthened. In this manner, the swirling flow of air is strengthened and the speed of the swirling flow is increased, so that the combustion efficiency and the exhaust emission characteristics are further improved, and the protection of the inner wall surface of the first combustion cylinder having a high heat load is also ensured. Become something.

In the combustion type heating device of the present invention, the first
A second combustion cylinder is connected to the downstream side of the combustion cylinder with a partition interposed therebetween, and a throttle opening is formed in the partition to communicate the first combustion chamber in the first combustion cylinder with the second combustion chamber in the second combustion cylinder. It is possible to make a cut in the radial direction from the diaphragm opening of the partition, and cut and raise one partition in a certain rotational direction as viewed from the cut to create a gap between the other partition. Can be formed. As a result, a swirl flow in a certain direction is generated in the fluid such as the combustion gas flowing into the second combustion chamber through the throttle opening, and the swirl flow also spreads to the upstream side, and the fuel, the air and the combustion in the first combustion chamber. Since a swirling flow in the same direction is generated in the gas, the mixing of the fuel and the air is promoted, and ultimately complete combustion is achieved.

Further, when a partition having a throttle opening is provided, a flange is formed at the downstream end of the first combustion cylinder, and the flange is attached to the partition, and the flange is formed by press working or the like. An air passage inclined with respect to the radial direction can be formed. As described above, by providing the air passage inclined in the radial direction in contact with the upstream side of the partition wall, not only a swirling flow is generated in the air flowing into the first combustion chamber through the air passage of the flange portion, but also Since a swirling flow of combustion gas or the like also occurs in the second combustion chamber in the first combustion cylinder through the throttle opening of the partition wall, mixing of fuel and air is promoted in any combustion chamber,
Ultimately, complete combustion is achieved. Further, since the air flowing into the first combustion chamber through the air passage of the flange portion flows along the surface of the partition wall, it not only cools the partition wall but also covers the partition wall surface and is heated by the heat of the high-temperature combustion gas. Prevent damage. Therefore, the durability of the partition wall is increased.

Further, the present invention provides a combustion method described in claim 10 as means for solving the above-mentioned problems. According to this combustion method, fuel is supplied to the fuel vaporization means provided at the bottom of the cylindrical first combustion cylinder that forms the first combustion chamber therein, and the fuel is vaporized. First from the air chamber provided in
A swirl that swirls combustion air supplied into the first combustion chamber through a plurality of air supply ports formed in a cylindrical surface of the combustion cylinder in a fixed rotational direction about a central axis of the first combustion cylinder. The inflow as the flow generates a swirling flow of air in the first combustion chamber. As a result, a part of the swirling air covers the entire inner wall surface of the first combustion cylinder, thereby preventing the hot combustion gas from directly contacting the inner wall surface of the first combustion cylinder. Therefore, although the combustion is almost completed only in the first combustion chamber, the heat load of the first combustion cylinder and the partition having the throttle opening is reduced, so that the first combustion cylinder and the partition having the throttle opening have high heat resistance. It is not necessary to use expensive materials having properties, and the first combustion cylinder can be reduced in size. Therefore, the entire heating device can also be reduced in size.

Further, since a negative pressure is generated by the swirling flow of the air generated in the first combustion chamber, the vaporizing action of the fuel discharged from the fuel vaporizing means becomes active, and the vaporized fuel swirls while swirling. The first combustion chamber, and hence the first combustion chamber, is small in size because it flows easily into the air to be diffused and easily stays in the first combustion chamber for a relatively long time due to swirling of the air-fuel mixture or combustion gas. Even if the fuel and air are mixed uniformly, the combustion is almost completed only in the first combustion chamber. As a result, not only the combustion efficiency and the exhaust emission characteristics are improved, but also the first combustion cylinder, which has a relatively high heat load, because almost no new combustion occurs in a portion downstream of the first combustion cylinder, This combustion method is suitable for use in, for example, a combustion-type heating device for vehicle air conditioning, because both the downstream portion can be downsized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main structure of a combustion type heating apparatus 1 according to a first embodiment of the present invention. Most of the heating device 1 is configured inside a laterally long cylindrical housing 2 of, for example, a heat insulating structure. FIG. 1 inside the housing 2
A partition plate 3 is provided at a position near the left end of the housing 2, and a first swirling air chamber 4 is provided between the partition plate 3 and the end wall 2 a of the housing 2.
Are formed. An air supply pipe 5 extending from a blower is tangentially connected to the first swirling air chamber 4 and opens at an inlet 5a as described later. A cylindrical air cylinder 6 is attached to the right side of the partition plate 3 coaxially with the housing 2. A partition 7 made of a material such as heat-resistant metal is provided at the right end of the air cylinder 6, and a diaphragm opening 7 a is formed in the center of the partition 7.

Inside the air cylinder 6, a bottomed cylindrical first combustion cylinder 8 made of a material such as a heat-resistant metal is provided coaxially with the air cylinder 6. A wick 9 made of a porous ceramic or a block of compressed noncombustible fiber is attached to the bottom of the first combustion cylinder 8. Fuel such as light oil is supplied to and penetrates the wick 9 by a fuel supply pipe 10 provided through the bottom wall 8a. Although not shown, it goes without saying that valves, pumps, fuel tanks, and the like are provided in connection with the fuel supply pipe 10. However, when the combustion heating device 1 is provided for air conditioning of a vehicle equipped with an internal combustion engine, a part of the fuel supply means provided in the internal combustion engine may be used as a part of these devices. It is possible.

As described above, the first combustion chamber 11 is formed as a space inside the first combustion cylinder 8, and the first combustion chamber 11 is formed as a bottomed cylindrical space between the first combustion cylinder 8 and the air cylinder 6. A two-turn air chamber 12 is formed. On the downstream side of the partition 7 that defines the right end of the first combustion chamber 11, a cylindrical second combustion cylinder 13 is attached as if it were an extension of the first combustion cylinder 8, and a space inside the second combustion cylinder 13 is provided. Second combustion chamber 14 as
Is formed and communicates with the first combustion chamber 11 via the throttle opening 7a of the partition wall 7. The space outside the second combustion cylinder 13 and the air cylinder 6 inside the housing 2 forms a fluid passage 15. As a feature of the present invention, the second combustion cylinder 13 is not provided with an air supply port.

Although not shown, the right end of the second combustion tube 13 can be opened to connect the second combustion chamber 14 inside the second combustion tube 13 to the right end of the fluid passage 15. In this case, the fluid passage 15 serves as a combustion gas passage, and the combustion gas flowing from the right end of the second combustion chamber 14 changes its flow direction and flows leftward in the fluid passage 15, and is close to the left end of the air cylinder 6. The exhaust gas is discharged to the outside from an exhaust gas passage (not shown) provided to connect to the position. The heat of the combustion gas flowing from the second combustion chamber 14 to the fluid passage 15 is transferred to the fluid to be heated (that is, engine cooling water as a heat medium, (Directly to the air) and used for air conditioning purposes.

As another embodiment, when the length of the second combustion cylinder 13 can be made sufficiently long, an exhaust gas passage (not shown) is directly connected to the right end of the second combustion cylinder 13. Then, the exhaust gas is discharged to the outside, the fluid passage 15 is used as a fluid passage to be heated, and the fluid to be heated is caused to flow through the fluid passage 15 as described above. As the exchange surface, the heat of the combustion gas flowing while swirling in the second combustion chamber 14 may be given to the heated fluid flowing in the fluid passage 15 via the wall surface of the second combustion cylinder 13.

Further, reference numeral 16 shown in FIG.
Is a glow plug that can be energized at the start of the first combustion chamber, and its heat-generating portion protrudes and is supported at a position close to the surface of the wick 9 (generally, fuel vaporization means) in the first combustion chamber 11. When energized, the glow plug 16 glows red and heats a part of the wick 9 to evaporate fuel and ignite fuel vapor.

As apparent from FIGS. 2 and 3 in addition to FIG. 1, the partition plate 3 in the housing 2 has a first plate.
A first air supply port 17 for allowing air to flow from the swirling air chamber 4 into the second swirling air chamber 12 is provided in the fuel supply pipe 10 substantially coincident with the center axis of the air cylinder 6 in this case. A plurality of openings are equally formed around the periphery. When the partition plate 3 is punched to form each of the first air supply ports 17, a tongue is formed.
From the central axis, leaving only one side of the tongue in a predetermined rotational direction about the central axis connected to the partition plate 3 and causing the free end of the tongue to be the same in the same rotational direction. The louver-shaped guide 18 is formed by inclining by an angle. The direction of the inclination of the guide 18 is such that the swirling flow of air generated in the first swirling air chamber 4 by the tangential air supply pipe 5 is not weakened, but is strengthened (increased in speed) of the second swirling air. A guide 18 is provided so that it can be sent into the chamber 12.
Is selected so that a swirling flow of air in the same rotational direction is also generated.

As a result, a high-speed swirling flow of air is generated in the second swirling air chamber 12. In the first embodiment, the swirling flow of the air is prevented from being attenuated, and the swirling flow of the swirling flow is prevented. In order to further increase the speed, a spiral straightening plate 19 as shown in FIG. 4 is attached to the outer peripheral surface of the first combustion cylinder 8 as a flow guide. The spiral straightening plate 19 does not need to be so high that the outer peripheral edge thereof reaches the inner peripheral surface of the air cylinder 6, and it is sufficient that an appropriate gap is formed there.

On the cylindrical surface of the first combustion cylinder 8, a plurality of second air supply ports 20 as openings through which air flows from the second swirling air chamber 12 into the first combustion chamber 11 are spirally formed. Around the central axis of the first combustion cylinder 8 (in this case, substantially the fuel supply pipe 10) and substantially uniformly in the direction of the central axis, avoiding interference with the flow straightening plate 19. Have been. A swirling flow guide 21 consisting of a tongue piece is also provided for these second air supply ports 20 in the same manner as the guide 18 for the first air supply port 17 shown in FIG.
That all guides 21 are inclined in the same rotational direction,
Needless to say, the direction of the inclination is set so as not to weaken the swirling flow of the air in the second swirling air chamber 12 and to further increase the speed thereof.

FIG. 5 schematically shows a state in which a blower 22 is mounted on the upper part of the combustion type heating apparatus 1 of the first embodiment. As is clear from this figure, the discharge port 22a of the blower 22 having a flat shape supported on the upper part of the heating device 1 has:
The air supply pipe 5 is connected to the air supply pipe 5 described above.
Is tangentially connected to the first swirling air chamber 4 in the housing 2.

Since the combustion-type heating apparatus 1 of the first embodiment is constructed as described above, the combustion air pressurized by the blower 22 passes through the air supply pipe 5 from the inlet 5a to the first air.
The tangential air flows into the swirling air chamber 4 and the first swirling air chamber 4
A swirling flow of air rotating around the fuel supply pipe 10 in the air is generated. The swirling air is the first air supply port 1
7 into the second swirling air chamber 12, where it is directed and guided by the guide 18, whereby a swirling flow having a higher speed in the same direction as the swirling flow in the first swirling air chamber 4 is performed. Is generated in the second swirling air chamber 12.

In the case of the first embodiment, the swirling flow is guided by the spiral flow straightening plate 19 provided in the second swirling air chamber 12, thereby preventing the swirling flow from being disturbed or attenuated. You. Therefore, the swirling air flow is generated by the guide 2
When the air flows into the first combustion chamber 11 through the second air supply port 20 provided with the first combustion chamber 1, a high-speed swirling flow of air is generated around the central axis in the first combustion chamber 11. The air swirling in this manner flows centrifugally and spirally along the inner wall surface of the first combustion cylinder 8 so as to spiral, and a part of the air comes into contact with the inner wall surface of the first combustion cylinder 8. An air layer having a relatively low flow velocity including a boundary layer covering the surface is formed.

The high-speed swirling flow of air in the first combustion cylinder 8 generates a relatively large negative pressure in the central portion and the periphery thereof, so that the fuel supplied through the fuel supply pipe 10 and permeating the wick 9 Easily evaporates from the surface of wick 9,
The fuel vapor rides on the swirling flow of air and diffuses and mixes into the swirling air to swirl together. However, the vaporized fuel hardly diffuses into a relatively low-velocity air layer including a boundary layer covering the inner wall surface of the first combustion cylinder 8. In this manner, the fuel and the air are uniformly mixed while the mixture of the fuel and the air remains in the first combustion chamber 11 for a relatively long time while swirling.

When the glow plug 16 is energized and glows red at the time of starting, the mixture of fuel and air ignites and burns. After ignition, the combustion gas swirls in the first combustion chamber 11 instead of or in a mixture with the air-fuel mixture, so that combustion is stably maintained even when the power supply to the glow plug 16 is cut off. Further, since the combustion gas swirls in the first combustion chamber 11, the high-temperature combustion gas stays in the first combustion chamber 11 for a relatively long time, so that the combustion is almost completely completed in the first combustion chamber 11. However, even if a little unburned fuel remains,
After the combustion gas flows from the first combustion chamber 11 through the throttle opening 7a of the partition 7 into the second combustion chamber 14, it is completely burned.

However, as a feature of the present invention, the second combustion cylinder 1
3 does not have any air supply port.
Combustion in the combustion chamber 14 is also performed by the remaining portion of the air supplied from the second air supply port 20 of the first combustion cylinder 8. Accordingly, since the combustion is almost completed in the first combustion chamber 11, it is not necessary to lengthen the second combustion cylinder 13, so that the entire combustion heating device 1 can be reduced in size.

Further, a high-speed air flow is blown into the first combustion chamber 11 and swirls in the first combustion chamber 11,
Since an air layer including a boundary layer that covers the surface of the first combustion cylinder 8 without gaps is uniformly formed on the inner wall surface, a swirling air layer remains on the inner wall surface even if the thickness is small, and the temperature is high. Since the burned combustion gas does not directly contact the inner wall surface of the first combustion cylinder 8, the temperature of the inner wall surface is kept lower than in the case of the prior art. Therefore, the heat load on the inner wall surface of the first combustion cylinder 8 exposed to the highest temperature in the combustion type heating device 1 and the partition wall 7 having the throttle opening 7a is reduced. This brings about a cost effect that a relatively inexpensive heat-resistant metal or the like constituting the first combustion cylinder 8 and the partition 7 can be used.
Further, the heat load of the first combustion cylinder 8 is reduced by the swirling flow of the air generated in the first combustion chamber 11, so that not only the first combustion cylinder 8 can be downsized and the entire heating device 1 can also be downsized. As a result, the combustion efficiency is increased, and the exhaust emission characteristics are also improved.

In the first embodiment, the guides 18 and 2
When forming the first air supply port 17 and the second air supply port 20 to which they are attached, the guides 18 and 21 are simultaneously integrated using a so-called "cut-and-raise" method. However, in the present invention, it is not necessary to always form a guide for generating a swirling flow of air by such a cutting and raising method. For example, the first air supply port 17 or the second air supply Instead of using the tongue piece punched out of the port 20 as it is, another guide larger than that may be attached to one side of the corresponding air supply port by means of rivets or welding.

Further, in the case of the first embodiment, a plurality of means capable of generating a swirl flow in the same rotational direction are connected in series in order to increase the speed of the swirl flow of air and counter the attenuation of the swirl flow. Although multiple stages are used in a superimposed manner, the present invention does not require that all of these multiple units be provided, and one of those units may be used depending on the application target, environmental conditions, and the like. The parts can be omitted, and some guides may be mounted in the opposite direction.

In the first embodiment, the first combustion cylinder 8
A wick 9 is provided at the bottom of the wick 9 so that the liquid fuel supplied from the fuel supply pipe 10 penetrates the wick 9 to evaporate from the surface thereof, and from the second air supply port 20 formed in the first combustion cylinder 8. The negative pressure due to the swirling flow of the blown air promotes the evaporation of the fuel from the surface of the wick 9. The wick 9 of the first embodiment is an example of a fuel vaporizing means. The fuel evaporating means according to the present invention is not necessarily a porous means through which liquid fuel can penetrate, and conventional means such as those utilizing the atomization effect of spraying from a nozzle and those performing centrifugal spraying with a rotating dish are used. Various types of fuel vaporization means as known from U.S. Pat.

FIGS. 6 and 7 show only the main parts of the second embodiment of the present invention. In the second embodiment, the first air supply port 17 or the second
This is to provide another means for forming the air supply port 20 instead of the means in the first embodiment. Also in the second embodiment, the guide 1 provided to generate the swirling flow of air or to enhance the swirling flow in the first embodiment.
A guide 23 is formed as an alternative to 8 or 21. The guide 23 is also formed by “cutting and raising” the partition plate 3 or the cylindrical surface of the first combustion cylinder 8 in the same manner as in the first embodiment, but is similar to the first embodiment. Instead of cutting off the other three sides while leaving only one side of the one air supply port 17 or the second air supply port 20, one of the three sides
By cutting off only the portion corresponding to the side and deforming the other portion, a guide 23 having an inclined air supply port 24 and generally triangular side walls 25 on both sides thereof is formed.

According to the guide 23 of the second embodiment, the air is supplied from the air supply port 24 into the second swirling air chamber 12 or the first combustion chamber 11.
Since the direction of the swirling flow of the air ejected into the inside is more reliable than in the case of the first embodiment, and the turbulence of the swirling flow formed in the first combustion chamber 11 is reduced, the first and second guides 18 and 21 are used. A swirling flow stronger than in the case of the first embodiment is obtained. However, since the opening area of the air supply port 24 is slightly smaller than that described above, it is necessary to increase the number of the air supply ports 24 with the guides 23 to obtain the amount of air required for combustion.

Next, a third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will not be repeated. The feature of the third embodiment lies in the shape of the throttle opening 7a of the partition wall 7 provided between the first combustion chamber 11 and the second combustion chamber 14. In the third embodiment, the partition 7
A plurality of cuts 7c are formed in a substantially radial direction from the throttle opening 7a, and one of the partition walls in a predetermined rotational direction viewed from each of the cuts 7c is bent toward the second combustion chamber 14 so that the fluid is removed. Cut-and-raised part 7b that serves as a guide
Is provided. Since the cut-and-raised portion 7b is provided, the partition portions on both sides of the cut 7c are shifted from each other to form a gap 7d.

Since the partition 7 in the third embodiment has the throttle opening 7a having such a shape, a part of the combustion gas flowing out of the first combustion chamber 11 to the second combustion chamber 14 may pass through the gap 7d. Then, a turning motion in a certain direction is forced by the cut-and-raised portion 7b of the partition wall 7. As in the above-described embodiment, when the combustion gas is also swirling due to the swirling flow of air in the first combustion chamber 11 caused by the guide 21 or the like, the direction of the swirling and the raising and lowering of the partition wall 7 are performed. Part 7b
, The swirling flow of the combustion gas flowing through the throttle opening 7a of the partition wall 7 and flowing into the second combustion chamber 14 is strengthened. It burns completely in the combustion chamber 14.

Even if the guide 21 and the like are not provided in the air supply port 20 of the first combustion cylinder 8 and there is no factor for actively turning the fuel, air and combustion gas in the first combustion chamber 11, When the swirling flow of the combustion gas or the like is generated in the second combustion chamber 14 by the swirling of the combustion gas or the like by the cut-and-raised portion 7b of the partition wall 7, the first flow on the upstream side is caused by the influence.
Even in the combustion chamber 11, swirl flows in the same direction occur in the flows of the fuel vapor, the air, and the combustion gas. In any case, the mixing of the fuel and the air is promoted by the swirling flow, so that the residual fuel is finally completely burned.

As described above, in the third embodiment, only the cut-and-raised portion 7b is provided in the throttle opening 7a of the partition wall 7, and the fuel is not only stored in the second combustion chamber 14 but also in the first combustion chamber 11. Since a swirling flow of air or combustion gas can be generated, it is not necessary to provide the air supply port 20 of the first combustion cylinder 8 with the guide 21 or the like for swirling the air passing therethrough. As in the case of the first embodiment, the cutting and raising process for forming the guide 21 can be omitted.

FIG. 11 shows a longitudinal section of a combustion type heating apparatus 1 'according to a fourth embodiment of the present invention. The shape of the transverse side is shown in FIG. As is clear from comparison with the combustion type heating device 1 of the first embodiment shown in FIG. 1, the guide 21 is not formed in the air supply port 20 in the fourth embodiment. Instead, in the fourth embodiment, a flange portion 8c is formed on the mating surface of the first combustion cylinder 8 with the partition wall 7, and air passages 8b are formed in several places by press working. As is clear from FIG. 12, the air passage 8b is not in the radial direction. In particular, when a plurality of outlets to the first combustion chamber 11 are provided, the air passage 8b has the same rotational direction with respect to the radial direction. At the same angle α.

In the fourth embodiment, since the air passage 8b inclined by the angle α with respect to the radial direction is provided, the first combustion chamber 11 passes from the air chamber 12 through the air passage 8b. The air flowing into the air flows while turning in a certain rotational direction along the partition wall 7. Thereby, the first
A swirling flow of fuel, air, and combustion gas having the same rotational direction is generated in the combustion chamber 11, and the swirl flow is also transmitted to the downstream second combustion chamber 14 through the throttle opening 7 a of the partition 7 in the same rotational direction. A swirling flow of the combustion gas or the like is generated. Therefore, even if there is no other means for swirling the fluid,
In this way, a swirl flow is generated in the first combustion chamber 11 and the second combustion chamber 14, so that mixing of fuel and air is promoted, and complete combustion is finally achieved.

In the case of the fourth embodiment, in particular, since the air flowing into the first combustion chamber 11 from the air passage 8b flows along the partition wall 7, the temperature of the partition wall 7, which becomes high due to the heat in the first combustion chamber 11, is reduced. When cooled, the surface of the partition 7 is covered with an air layer, and the combustion gas does not directly contact the partition 7, so that there is an advantage that the durability of the partition 7 is increased. The same applies to the combustion-type heating apparatus 1 of the first embodiment described above. However, in each embodiment of the present invention, as shown by arrows in FIG.
Since the air flowing into the first combustion chamber 11 through the first combustion chamber 11 becomes a swirling flow around the central axis, the air layer A along the inner surface of the cylindrical first combustion cylinder 8 in the first combustion chamber 11 is formed. Is formed. Therefore, the durability of the first combustion cylinder 8 is increased because the air layer A functions to protect the first combustion cylinder 8 from the heat of the combustion gas.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing most of a combustion-type heating apparatus according to a first embodiment.

FIG. 2 is an enlarged sectional view showing a part of the combustion-type heating device of the first embodiment.

FIG. 3 is a side view of a part of the combustion type heating device of the first embodiment.

FIG. 4 is a perspective view of a part of the combustion type heating device of the first embodiment.

FIG. 5 is a side view schematically showing the entire combustion type heating device of the first embodiment.

FIG. 6 is an enlarged vertical sectional front view showing only a main part of a combustion type heating apparatus according to a second embodiment.

FIG. 7 is a cross-sectional side view of a main part of the second embodiment shown in FIG. 6;

FIG. 8 is a longitudinal sectional front view showing a main part of a combustion type heating device according to a third embodiment.

FIG. 9 is a cross-sectional side view of a main part of the third embodiment shown in FIG.

FIG. 10 is a perspective view of a part of a main part of the third embodiment shown in FIG.

FIG. 11 is a longitudinal sectional front view showing most of a combustion type heating device according to a fourth embodiment.

FIG. 12 is a cross-sectional side view of the heating device of the fourth embodiment shown in FIG.

FIG. 13 is a cross-sectional side view conceptually showing a cross section of a first combustion cylinder in order to show the effect of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Combustion type heating device of 1st embodiment 2 ... Housing 3 ... Partition plate 4 ... 1st swirling air chamber 5 ... Air supply pipe 6 ... Air cylinder 7 ... Partition wall with a throttle opening 7a ... Throttle opening 7b ... Cut-and-raised part 7c ... notch 7d ... gap 8 ... first combustion cylinder 8b ... air passage 8c ... flange 9 ... wick 10 ... fuel supply pipe 11 ... first combustion chamber 12 ... second swirl air chamber 13 ... second combustion cylinder 15 ... fluid Passage 17: First air supply port 18: Guide 19: Spiral straightening plate 20: Second air supply port 21: Guide 22: Blower 23: Guide (second embodiment) 24: Air supply port (second embodiment) ) 25 ... Side wall A ... Air layer α ... Angle

Continuation of the front page (72) Inventor ▲ Nara ▼ Takanori Hara 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (reference) 3K023 EA03 3K047 BA02 BB04 BB14

Claims (10)

[Claims] At the bottom of a cylindrical first combustion cylinder forming a first combustion chamber therein, fuel vaporization means for vaporizing fuel supplied by fuel supply means is provided, and the first combustion cylinder is provided with a fuel vaporization means. On the cylindrical surface, a swirling flow is formed so as to swirl the air for combustion from the air chamber formed outside thereof into the first combustion chamber in a fixed rotational direction around the central axis of the first combustion cylinder. A combustion-type heating device, wherein a plurality of air supply ports for inflow are formed. 2. The combustion according to claim 1, wherein the fuel vaporization means provided in the first combustion chamber comprises a porous wick capable of permeating the liquid fuel supplied by the fuel supply means to the surface. Type heating device. 3. The first combustion cylinder according to claim 1, wherein at least a part of the plurality of air supply ports provided in the cylinder surface of the first combustion cylinder is a part of the cylinder surface of the first combustion cylinder. A combustion-type heating device characterized by being formed together with an air guide by cutting and raising inside or outside a combustion cylinder. 4. The method according to claim 1, wherein
A combustion type heating device, wherein a spiral flow straightening plate for guiding air is provided in the air chamber outside a cylindrical surface of the first combustion cylinder. 5. The method according to claim 1, wherein
The partition plate attached to the housing at a distance from the bottom surface of the first combustion cylinder to partition the front surface of the air chamber formed outside the first combustion cylinder, A plurality of combustion air flows from another air chamber formed on the upstream side into the air chamber so as to form a swirling flow swirling in the constant rotational direction around a central axis of the first combustion cylinder; A combustion-type heating device, wherein another air supply port is formed. 6. The combustion according to claim 5, wherein at least a part of the plurality of other air supply ports is formed together with an air guide by cutting and raising a part of the partition plate. Type heating device. 7. The air supply pipe according to claim 5, wherein the air supply pipe for supplying combustion air to the other air chamber supplies combustion air to the other air chamber along a center axis of the first combustion cylinder. A combustion-type heating device, which is tangentially connected to the housing for inflow so as to form a swirling flow swirling around the fixed rotational direction. 8. The fuel cell system according to claim 1, wherein a partition is attached to a downstream end of the first combustion cylinder, and the first combustion cylinder is connected to a second combustion cylinder downstream with the partition interposed therebetween. Thereby, the first combustion chamber in the first combustion cylinder is connected to the second combustion cylinder in the second combustion cylinder through a throttle opening formed in the partition.
When communicating with the combustion chamber, a cut is provided in the radial direction from the throttle opening of the partition, and one partition in a certain rotational direction is cut and raised from the cut to form a gap between the partition and the other partition. By forming a gap in
A combustion type heating device characterized in that a swirling flow in a certain direction is generated in a fluid such as combustion gas flowing into the second combustion chamber at least through the throttle opening. 9. The first combustion cylinder according to claim 1, wherein a partition is attached to a flange formed at a downstream end of the first combustion cylinder, and the first combustion cylinder is downstream of the first combustion cylinder with the partition interposed therebetween. When the first combustion chamber in the first combustion cylinder communicates with the second combustion chamber in the second combustion cylinder via a throttle opening formed in the partition wall, An air passage is formed in a flange portion of the first combustion cylinder, and the air passage is inclined in a constant rotational direction with respect to a radial direction, so that the first combustion passes through the air passage of the flange portion. A combustion type heating device wherein a swirling flow in a certain direction is generated in air flowing into a room. 10. A fuel is supplied to a fuel vaporizer provided at the bottom of a cylindrical first combustion cylinder that forms a first combustion chamber therein to vaporize the fuel, and is formed outside the first combustion cylinder. The air for combustion supplied from the air chamber into the first combustion chamber through a plurality of air supply ports formed in the cylindrical surface of the first combustion cylinder flows around the central axis of the first combustion cylinder. By causing the swirling flow to swirl in a constant rotational direction, a swirling flow of air is generated in the first combustion chamber, and a part of the swirling air covers the inner wall surface of the first combustion cylinder evenly. On the other hand, while promoting the action of the fuel vaporizing means by the negative pressure generated by the swirling flow of air, it is necessary to uniformly diffuse and mix the vaporized fuel into the swirling air and burn the fuel in the first combustion chamber. Combustion-type heating device combustion Method.