JPH09210314A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make thinner a vaporizer and hence make more compact a combustion apparatus body. SOLUTION: This combustion apparatus comprises a bottomed cylindrical vaporizer 6 including a sheathed heater 11 therein and having a combustion air supply hole 9 at an eccentric position of part of an outer peripheral wall 8, a burner head 13 having a mixture gas inflow hole 14 at the center thereof to cover an upper opening, and an annular inner peripheral wall 8 provided in the vaporizer 6 opposing the mixture gas inflow hole 14 and having its size larger than the diameter of the mixture gas inflow hole 14. Accordingly, even when the vaporizer 6 is made thinner, a flow guide passage is secured up to the burner head 13 so that vaporized gas and the combustion air are sufficiently mixed to prevent yellow fire, odor, soot, and CO, etc., from being produced owing to incomplete combustion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for a vaporization type combustor.

[0002]

2. Description of the Related Art A conventional vaporization type combustor combustor is constructed as shown in FIG. Reference numeral 30 denotes a bottomed cylindrical vaporization cylinder for vaporizing the liquid fuel, in which a sheathed heater 31 is embedded. A burner head 32 is arranged above the vaporization cylinder 30, and the mixed gas inlet 3
3 is provided. Reference numeral 34 is an air supply pipe for sending combustion air to the inside of the vaporization cylinder 30, the tip of which is fixed to the wall surface of the vaporization cylinder 30 and the other end communicates with a blower. 35
Is exposed to the inside of the vaporization / mixing cylinder 30 through the inside of the air supply pipe 34 by the nozzle communicated with the fuel pump.

The operation of the thus constructed combustion apparatus will be described below. First, when the vaporization cylinder 30 is heated to a predetermined temperature by the sheathed heater 31 in which the vaporization cylinder 30 is embedded, combustion air is supplied from the air supply pipe 34 to the vaporization cylinder 30.
The liquid fuel is sent to the inside, and at the same time, the liquid fuel is ejected from the nozzle 35 into the vaporization cylinder 30. The liquid fuel is vaporized on the wall surface of the heated vaporization cylinder 30, mixed with the combustion air, and then sent into the burner head 32 through the mixed gas introduction port 33. Then, a flame 36 is formed around the burner head 32 by spark discharge from an ignition electrode (not shown).

[0004]

In recent years, despite the fact that the market trend of general combustors is becoming more compact, the conventional configuration described above sufficiently supplies liquid fuel and combustion air. In order to mix and prevent the generation of yellow fire, odor, soot, CO and the like due to incomplete combustion due to insufficient mixing, the vaporization cylinder 30 requires a certain depth or more. If it becomes difficult to make the vaporization cylinder 30 thin, it is difficult to make the combustor body compact.

The present invention is intended to solve the above problems. A first object of the present invention is to reduce the thickness of a vaporization cylinder in order to make a combustor body compact, and to further improve the mixing performance by providing a longer path for a mixed gas. The second purpose is to prevent incomplete combustion, and the third, fourth, and fifth purposes are to further improve mixing performance of vaporized gas and combustion air to prevent incomplete combustion.

[0006]

In order to solve the above-mentioned problems, the present invention has a bottomed cylindrical vaporizing cylinder having a heater therein and a hole for supplying combustion air on its side surface, and an upper opening thereof. A burner head having a mixed gas inlet in a substantially central portion so as to cover and a flame hole substantially evenly provided on the entire circumference of the peripheral wall, and a fuel injection nozzle facing a combustion air supply hole of the vaporization cylinder. It is configured such that an annular inner peripheral wall having a diameter larger than the diameter of the mixed gas inlet is provided inside the vaporization cylinder facing the mixed gas inlet.

According to the present invention, even if the vaporization cylinder is made thin, a sufficient flow passage is ensured until the mixed gas is introduced into the burner head. It is possible to prevent the generation of soot, soot, CO and the like.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention includes a heater having a built-in heater and a bottomed cylindrical vaporization cylinder having a hole for supplying combustion air at an eccentric position of a part of its outer peripheral wall, and a heater for covering the upper opening thereof. A burner head having a mixed gas inflow port in the central portion and having flame holes substantially evenly provided on the entire circumference of the peripheral wall, and a nozzle for ejecting liquid fuel facing a hole for supplying combustion air of the vaporization cylinder, An annular inner peripheral wall having a diameter larger than the diameter of the mixed gas inlet is provided inside the vaporization cylinder facing the mixed gas inlet.

With the above structure, even if the vaporization cylinder is made thin, a sufficient flow passage is ensured until the mixed gas is introduced into the burner head, so that yellow flame, odor, Generation of soot and CO can be prevented.

Further, a mixed gas introduction pipe is provided so as to overlap the mixed gas inlet of the burner head with the inside of the annular inner peripheral wall of the vaporization cylinder.

According to the above-mentioned structure, the mixed gas introducing pipe is provided so as to overlap the inside of the inner peripheral wall of the bottomed cylindrical vaporizing cylinder from the mixed gas inlet of the burner head. Since the route is secured enough,
Mixing performance of vaporized gas and combustion air is improved and incomplete combustion is prevented.

Further, in the mixed gas conducting path formed between the outer peripheral wall inside the vaporization cylinder, the annular inner peripheral wall and the burner head, the vaporization surface of the liquid fuel and the upper part of the path until the mixed gas pass over the inner peripheral wall are partitioned. As described above, the mixing promoting plate is provided inside the burner head or the vaporizing cylinder.

With the above structure, the flow of the mixed gas is changed by the mixing promotion plate, and the mixing performance of the vaporized gas and the combustion air is further improved by the action of the vortex effect generated at the end face thereof.
By narrowing the mixed gas flow path once, the mixing performance is improved and incomplete combustion is prevented.

Further, the mixing promoting plate mounted inside the burner head or the vaporizing cylinder is inclined in a direction not against the flow of the mixed gas in the mixed gas guiding passage.

Since the mixing promoting plate is inclined, the pressure loss due to partitioning the upper part of the path is reduced, and incomplete combustion is prevented.

Further, a convex portion is provided on the vaporization surface where the liquid fuel supplied from the nozzle becomes vaporized gas.

With the above structure, the area of vaporization is expanded by raising the vaporization surface, and the vaporization capacity is expanded.
Instantaneous vaporization is realized to prevent incomplete combustion, and at the same time, it is possible to cope with an increase in liquid fuel accompanying an increase in combustion amount.

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 is a blow block, 2 is a vaporization mixing block, and 3 is a combustion block. The blower block 1 is composed of a blower fan 4 for sending combustion air to the vaporization / mixing block 2, and a shaft 5 that serves to connect the blower fan 4 and a blower motor that is a power source for rotating the blower fan 4. The vaporization mixing block 2 is provided with a bottomed cylindrical vaporization cylinder 6, and the inside of the vaporization cylinder 6 is composed of an outer peripheral wall 7 serving as a vaporization surface and an annular inner peripheral wall 8 and an outer peripheral wall 7.
A combustion air supply port 9 is provided at an eccentric position on a part of the peripheral wall of the. A nozzle 10 communicated with a fuel pump faces the inside of the vaporization cylinder 6 through the inside of the combustion air supply port 9. A sheath heater 11 is embedded in the vaporization cylinder 6. Also, the blower block 1 and the vaporization mixing block 2
Is a combustion air communication port for supplying combustion air 1
2 are provided. The combustion block 3 has a burner head 13 arranged above the vaporization cylinder 6 so as to cover the opening, and the burner head 13 has a mixed gas inflow port 14 at a central position facing the annular inner peripheral wall 8 and the entire periphery. The flame holes 15 are evenly provided on the circumference. here,
The vaporizing cylinder 6 is provided so that the wall extends from the inner peripheral wall 8 to one side of the combustion air supply port 9 and contacts the outer peripheral wall 7 in order to swirl and improve the mixing of the vaporized gas and the combustion air. Further, in order to prevent the combustion air before being mixed with the vaporized gas from flowing into the burner head 13, the height of the inner peripheral wall 8 is set to the liquid fuel sent from the nozzle 10 from the side wall of the combustion air supply port 9. Until the outer peripheral wall 7 becomes vaporized gas, the height is set so that the burner head 13 arranged at the upper part does not come into contact with the burner head 13 or the combustion air may pass over the inner peripheral wall 9. The height of the inner peripheral wall 9 after the vaporized gas and the combustion air become a mixed gas is low so that the mixed gas can easily flow into the burner head 13. As a result, the flow path of the mixed gas extends in the circumferential direction.

The operation of the combustion device configured as described above will be described below. First, when the vaporization cylinder 6 is heated to a predetermined temperature by the embedded sheath heater 11, the blower fan 4 is rotated by the drive of the blower motor, and the combustion air passes through the combustion air communication port 12 to the vaporization mixing block 2. Is led. Then, the combustion air is sent from the combustion air supply port 9 into the inside of the vaporization cylinder 6, and at the same time, the liquid fuel is ejected from the nozzle 10 into the inside of the vaporization cylinder 6. The liquid fuel becomes vaporized gas on the outer peripheral wall 7 of the heated vaporization cylinder 6, and is mixed with combustion air until it swirls in the circumferential direction and passes over the inner peripheral wall 8 to become mixed gas. The mixed gas is sent into the burner head 13 through the mixed gas inflow port 14. Then, a spark 16 (not shown) from the ignition electrode forms a flame 16 in the flame hole 15 around the burner head 13.

(Embodiment 2) In FIG. 2, a mixed gas introducing pipe 17 is provided so as to overlap the inside of the annular inner peripheral wall 8 of the vaporization cylinder 6 from the mixed gas inlet 14 of the burner head 13 of the above combustion apparatus. It is a thing.

According to the above-mentioned structure, the liquid fuel becomes vaporized gas on the outer peripheral wall 7 of the vaporizing cylinder 6, swirls in the circumferential direction together with the combustion air to get over the inner peripheral wall 8, and then once sinks. The flame 16 is introduced into the mixed gas introduction pipe 17 and forms the flame 16 around the burner head 13. According to this structure, the flow path is extended more than in the structure shown in FIG. 1, and the mixing performance is further improved.

(Embodiment 3) FIG. 3 shows an upper part of a mixed gas flow guide path constituted by an outer peripheral wall 7 and an inner peripheral wall 8 of the combustion apparatus shown in FIG. 1 and a burner head 13 arranged on the upper part. The mixing promoting plate 18 is provided so as to block the light. The mounting position of the mixing promotion plate 18 is to be set between the vaporization surface of the liquid fuel and a position where the mixed gas on the inner peripheral wall 8 is lowered so as to get over the mixed fuel. The gap between and is not more than an extent that does not adversely affect the suppression of the mixed gas.

According to the above construction, when the mixed gas passes through the mixing promoting plate 18, Karman vortices are generated at the end face on the downstream side of the mixing promoting plate 18, causing turbulence in the flow of the mixed gas. . According to this configuration, the mixing performance is improved by causing turbulence in the air flow. Further, by providing the mixing promotion plate 18, the mixed gas guiding path is once narrowed, which leads to improvement of the mixing performance.

(Embodiment 4) FIG. 4 shows the mixing promoting plate 18 of the above combustion apparatus which is inclined in a direction not against the flow of the mixed gas.

According to the above structure, the shortage of combustion air caused by the pressure loss due to partitioning the upper portion of the mixed gas flow passage is reduced and incomplete combustion is prevented.

(Embodiment 5) FIG. 5 shows the vaporization cylinder 6 of the combustion apparatus shown in FIG. 1 in which the convex portion 19 is provided on the vaporization surface where the liquid fuel supplied from the nozzle 10 becomes vaporized gas. At this time, a large number of convex portions 19 may be provided as long as they are within the range in which the vaporization capacity is increased.

According to the above-mentioned structure, the area of vaporization is expanded by enlarging the vaporization surface and the vaporization capacity is enlarged, and instantaneous vaporization is realized to prevent vaporization unevenness and incomplete combustion is prevented. It becomes a thing. At the same time, since the vaporization capacity is expanded, it becomes possible to cope with the increase in the liquid fuel accompanying the increase in the combustion amount, and the shortage of the vaporization capacity due to the increase in the combustion amount is eliminated, and there is no fear of incomplete combustion.

[0028]

As described above, according to the combustion apparatus of the present invention, even if the vaporization cylinder is made thinner than the conventional one, the flow passage to the burner head is secured, and the vaporized gas and the combustion air are sufficient. It is possible to prevent generation of yellow fire, odor, soot, CO, etc. due to incomplete combustion. Further, it is possible to cope with an increase in the amount of combustion without enlarging the vaporization cylinder, so that the combustion device can be made compact and the combustor body can be made compact.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing a combustion device according to a first embodiment of the present invention. FIG. 1B is a plan view showing a vaporization cylinder of the combustion device.

FIG. 2 is a sectional view of a combustion device provided with a mixed gas introduction pipe according to a second embodiment of the present invention.

FIG. 3 (a) is a cross-sectional view of a combustion apparatus provided with a mixing promotion plate according to a third embodiment of the present invention (b) is a plan view of a vaporization cylinder provided with the mixing promotion plate

FIG. 4 is a view showing the concept of a mixing promotion plate according to Example 4 of the present invention.

FIG. 5 (a) is a sectional view of a combustion apparatus having a convex portion according to a fifth embodiment of the present invention. FIG. 5 (b) is a plan view of a vaporizing cylinder having the convex portion.

FIG. 6 is a sectional view of a conventional combustion device.

[Explanation of symbols]

 6 Vaporizing cylinder 7 Outer peripheral wall 8 Inner peripheral wall 9 Combustion air supply port 10 Nozzle 11 Seesheater 13 Burner head 14 Mixed gas inlet 15 Flame port 17 Mixed gas introduction pipe 18 Mixing promotion plate 19 Convex part

Claims (5)

[Claims] 1. A vaporization cylinder having a bottom and having a heater built-in and a hole for supplying combustion air at an eccentric position of a part of an outer peripheral wall thereof, and a mixed gas in a substantially central portion so as to cover an upper opening thereof. The burner head is provided with an inlet and flame holes are provided substantially evenly on the entire circumference of the peripheral wall, and a nozzle for jetting the liquid fuel facing the hole for supplying the combustion air of the vaporization cylinder is provided. Combustor in which an annular inner peripheral wall having a diameter larger than the mixed gas inflow port diameter is provided inside the vaporization cylinder opposite to. 2. The combustion apparatus according to claim 1, wherein a mixed gas introduction pipe is provided so as to overlap the mixed gas inlet of the burner head with the inside of the annular inner peripheral wall of the vaporization cylinder. 3. A mixed gas conducting path formed between an outer peripheral wall inside a vaporization cylinder, an annular inner peripheral wall and a burner head,
The combustion apparatus according to claim 1, wherein a mixing promotion plate is provided inside the burner head or the vaporization cylinder so as to partition an upper portion of a path through which the vaporized surface of the liquid fuel and the mixed gas pass over the inner peripheral wall. 4. The combustion apparatus according to claim 3, wherein the mixing promoting plate attached to the inside of the burner head or the vaporizing cylinder is inclined in a direction not against the flow of the mixed gas in the mixed gas guiding passage. 5. The combustion apparatus according to claim 1, wherein a convex portion is provided on a vaporization surface where the liquid fuel supplied from the nozzle becomes vaporized gas.