JP6466303B2 - Combustion device - Google Patents

Description

  The present invention relates to a gun-type combustion apparatus that can improve combustion efficiency, reduce noise, and suppress the emission of bad odors.

  2. Description of the Related Art Conventionally, liquid fuel combustion apparatuses that supply liquid atomized fuel into a combustion cylinder and burn it in the combustion cylinder have become widespread. For example, Patent Document 1 discloses a technique related to a liquid fuel combustion apparatus that can ensure flame stability and perform good ignition.

  The configuration of the liquid fuel combustion apparatus 90 of Patent Document 1 will be described with reference to FIG. FIG. 9A is a longitudinal sectional configuration diagram of the liquid fuel combustion apparatus 90 of Patent Document 1, and FIG. 9B is a lateral sectional configuration diagram. The liquid fuel combustion apparatus 90 includes an outer case 60, a blower 70, a spray nozzle 29, a flame holder 20, a combustion cylinder 26, a first partition cylinder 40, a second partition cylinder 50, an igniter 80, and the like. Yes. The mist-like fuel emitted from the spray nozzle 29 enters the introduction hole 21 and is ejected as a spiral swirl flow by the swirl vane portion 22. At the same time, the mist fuel is ignited by the igniter 80, and a flame is generated inside the combustion cylinder 26.

  The flow of air in the liquid fuel combustion apparatus 90 will be described. The air sent into the apparatus by the blower 70 becomes a first swirl flow by the air flow swirl guide 63 and the rectifying plate 62. Part of the first swirl flow enters the air inlet 27 of the combustion cylinder 26. The other flow of the first swirl flow enters the air receiving port 51 of the second partition tube 50 and is swirled by the air flow swirl guide 52. Further, a part of the air swirled by the air flow swirl guide 52 enters the swirl vane portion 22 and swirls by the air flow swirl guide 42 of the first partition tube 40 after entering the air receiving port 41. It is made to flow. In other words, the air flow from the blower 70 of the liquid fuel combustion apparatus 90 is swirled in a multiple manner by the airflow swirling guide 63, the airflow swirling guide 52, and the airflow swirling guide 42.

JP-A-8-296817

  However, although the above-described liquid fuel combustion device 90 swirls the supplied air in multiples before combustion, the mist-like fuel emitted from the spray nozzle 29 is swirled only by the swirl vane portion 22. Therefore, the combustion efficiency is low and malodors are discharged. Of the fuel droplets that have come out of the combustion cylinder 26, the fuel that has jumped out of the combustion zone 25 remains unburned and causes soot and odors. That is, the mist-like fuel does not burn sufficiently inside the combustion cylinder 26 and jumps out of the combustion cylinder 26. On the other hand, when the flow velocity of air in the combustion cylinder 26 is increased to promote mixing with fuel droplets and combustion, there is a problem that noise increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a combustion apparatus capable of improving combustion efficiency, reducing noise, and suppressing emission of bad odors.

  The present invention has the following configuration in order to solve the above problems.

(1) an inlet into which combustion air flows;
A spray nozzle for spraying fuel;
Ignition means for igniting the sprayed fuel;
Combustion flow swirling means for swirling the flow of fuel in a spray state from the spray nozzle;
A combustion cylinder in which the fuel swirled by the combustion flow swirling means burns,
The combustion apparatus, wherein the combustion cylinder has a plurality of swirl flow generating portions for swirling the combustion air in a circumferential direction of the cylinder wall.

  (2) The combustion apparatus according to (1), further comprising rectifying means for rectifying the flow of air flowing in from the inlet.

  (3) The combustion apparatus according to (1) or (2), wherein the plurality of swirl flow generating portions are formed by cutting and raising a cylindrical wall of the combustion cylinder.

  (4) The combustion apparatus according to any one of (1) to (3), wherein a plurality of jet outlets through which the combustion air is jetted are provided on an outer peripheral portion of the outlet of the combustion cylinder. .

  According to the present invention, it is possible to provide a combustion apparatus capable of improving combustion efficiency, reducing noise, and suppressing odor emission.

The figure which shows the structure of the hot water storage type hot water supply apparatus using the combustion apparatus of this invention. The figure which shows the structure of the combustion apparatus of this invention The figure which shows the combustion ring of the combustion apparatus of this invention The figure which shows the combustion cylinder of the combustion apparatus of this invention The figure which shows the flow of the air of the combustion apparatus of this invention The figure which shows the flow of the combustion flow of the combustion apparatus of this invention The figure which shows the state which installed the baffle plate in a part of combustion apparatus of this invention The figure for comparing the combustion state of the combustion apparatus of this invention and the conventional combustion apparatus The figure which shows the structure of the conventional liquid fuel combustion apparatus

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described below with reference to the drawings.

[Configuration of hot water storage water heater]
A hot water storage type water heater using the combustion apparatus of the present invention will be described with reference to FIG. FIG. 1A is an external perspective view of the hot water storage type water heater 30, and FIG. 1B is a cross-sectional perspective view of the hot water storage type water heater 30. The main components of the hot water storage type water heater 30 are a heat exchanger 1, a combustion device 2, a blower 3, a burner 4, a silencer case 5, and the like. Low temperature water is supplied from the water supply port 6 and stored in the hot water storage section 7. And the water stored in the hot water storage part 7 is warmed by the inside of the heat exchanger 1 being heated by the flame generated by the combustion device 2 in the combustion chamber 8. The warmed water is discharged from the tap 9. In the figure, an arrow A indicates a flow of supply air, an arrow B indicates a flow of exhaust, and an arrow C indicates a flow of kerosene as fuel.

[Combustion device configuration]
The configuration of the combustion apparatus 2 will be described with reference to FIG. The combustion apparatus 2 is covered with an outer cylinder 2a and an outer case 2b on the outside, and has a flange portion 2c for attaching to the hot water storage type hot water heater 30 main body. A combustion cylinder 10 is installed inside the outer cylinder 2a, and a combustion ring 11 (combustion flow swirling means) is installed at the bottom of the combustion cylinder 10. Further, a plurality of jet outlets 12 are installed in the circumferential direction between the outer cylinder 2 a and the outlet of the combustion cylinder 10. Further, a fuel spray nozzle 13 is installed at the center of the combustion ring 11.

  FIG. 3 shows an external perspective view of the combustion ring 11 installed at the bottom of the combustion cylinder 10. An introduction hole 11a is opened at the center of the combustion ring 11, and a plurality of swirl vane portions 11b are installed radially. The swirl vane portion 11b has a function of swirling the combustion flow and air entering from the introduction hole 11a. In addition, the swirl | wing blade part 11b is formed by cutting and raising a sheet metal.

  FIG. 4 shows an external perspective view of the combustion cylinder 10. The combustion cylinder 10 includes a cylinder part 10a and a plurality of swirl flow generating parts 10b formed on the inner circumference. The swirl flow generating portion 10b is created by cutting and raising the cylindrical wall of the cylindrical portion 10a. In addition, air intake ports 28 are formed on a plurality of circumferences. The air intake port 28 is a hole for taking outside air into the combustion cylinder 10.

[Combustion flow and air flow]
FIG. 5 shows the flow of air in the combustion device 2. Air flowing in from the air intake 31 formed in the outer case 2 b of the combustion device 2 flows in the direction of arrow F. Then, the flow of the arrow F branches into one that enters the inside of the partition cylinder 15, one that enters the combustion ring 11, and one that enters the gap between the outer cylinder 2 a and the combustion cylinder 10. The air that has entered the partition cylinder 15 is mixed with the fuel from the spray nozzle 13 and enters the combustion cylinder 10. The fuel in the sprayed state that has come out of the spray nozzle 13 is ignited and burned by an igniter 16 (ignition means). Moreover, the air which entered the combustion ring 11 turns into a swirl flow by the swirl vane portion 11b. Further, a part of the air that has entered the gap between the outer cylinder 2 a and the combustion cylinder 10 enters the combustion cylinder 10 from the air intake port 28, and a part thereof is ejected from the plurality of ejection ports 12. The rectifying plate 14 (rectifying means) in FIG. 5 will be described later.

  The fuel droplets of the combustion flow injected from the fuel spray nozzle 13 form a spiral trajectory D as shown in FIG. 6, with a large droplet at the periphery of the spray and a small droplet at the center. Is distributed. The combustion flow means a mixture of mist-like fuel and air. The air that has exited from the spout 12 flows in the direction of the straight path E. Further, by suppressing the flow velocity of the air exiting from the outlet of the combustion cylinder 10, droplets near the center of the combustion cylinder 10 can be burned in a low-noise air stream. The droplets at the peripheral edge of the spray can stay in a high temperature region until even a large droplet evaporates by getting on the spiral orbit D generated from the swirl flow generating unit 10b. It becomes possible to burn in the combustion chamber 8 of the machine 30.

  Further, in the combustion chamber 8 of the hot water storage type hot water heater 30, the wind speed in the X-axis direction (see FIG. 6) is low, and combustion occurs in a spiral airflow. Combustion efficiency is also improved by flowing directly into a certain heat exchanger 1.

  The combustion apparatus 2 of the present invention can reduce noise while completely burning the sprayed fuel by suppressing the flow velocity in the X-axis direction in the combustion cylinder 10 and generating a swirling flow near the outlet. It becomes.

  FIG. 7 shows a state where the rectifying plate 14 is installed in a part of the combustion apparatus. By providing the rectifying plate 14, the amount of fluctuation of the air flow entering the combustion cylinder 10 can be suppressed, and the combustion efficiency can be improved. The rectifying plate 14 is installed in front of the location of the air intake 31 and the spray nozzle 13 in FIG.

  FIG. 8A shows a combustion state when fuel is combusted by the combustion apparatus of the present invention. From this figure, it can be seen that the flame extends to a position away from the combustion cylinder 10 and sufficient fuel combustion is realized. On the other hand, FIG. 8B shows a combustion state by a conventional combustion apparatus. It can be seen that there are many unburned fuel particles and sufficient fuel is not burned.

  According to the combustion apparatus of the present invention, it is possible to provide a combustion apparatus that can improve combustion efficiency, reduce noise, and suppress emission of bad odor.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Combustion apparatus 2a Outer cylinder 2b Outer case 2c Flange part 3 Blower 4 Burner 5 Noise case 7 Hot water storage part 8 Combustion chamber 9 Outlet 10 Combustion cylinder 10a Tube part 10b Swirling flow generation part 11 Combustion ring (combustion flow swirl) means)
11a Introducing hole 11b Swirling blade part 12 Spout 13 Spray nozzle 14 Rectifying plate (rectifying means)
15 Partition cylinder 16 Igniter (ignition means)
28 Air intake 30 Hot water storage type water heater 31 Air intake

Claims (3)

An inlet into which combustion air flows,
A spray nozzle for spraying fuel;
And ignition means for igniting the fuel which is to mists state,
A combustion swirl means for swirling the flow of the fuel spray state exiting from the spray nozzle,
A combustion cylinder in which the fuel is pivoted by said combustion stream swirl unit is combusted therein,
An outer cylinder covering the combustion cylinder;
A combustion device comprising:
The combustion cylinder is
A plurality of air intake ports arranged on a side wall of the combustion cylinder to allow the combustion air to flow into the combustion cylinder;
In the state near the outlet of the combustion cylinder in a state where an inlet for allowing air to flow into the combustion cylinder is not disposed between the plurality of air intake ports on the outlet side of the combustion cylinder and between the outlets. A plurality of swirl flow generating portions that are provided in a circumferential direction on an inner side wall, flow the combustion air into the combustion cylinder, and swirl the combustion air;
The swirl flow generation section of each of a convex shape protruding inward from the side wall of the combustion tube, the combustion flow downstream side in the rotational direction to the air inflow allowed that the opening for the combustion of said fuel swirling by the turning means Have
The air for the combustion of inflows from the opening of the swirl flow generation section is configured to inflows to the center of the combustion cylinder, a swirling flow is formed in the vicinity of the outlet of the combustion cylinder,
In the outer peripheral portion of the outlet of the combustion cylinder, there are provided a plurality of jet outlets through which the combustion air is jetted to the outside of the combustion cylinder between the combustion cylinder and the outer cylinder.
The plurality of jet nozzles have a jet direction of the combustion air ejected from the plurality of jet nozzles along a direction in which a flame combusted by the fuel coming out of the combustion cylinder extends and at the center of the flame. A combustion apparatus, wherein the combustion apparatus is arranged so as to be inclined toward the center of the combustion cylinder so as to flow in a direction toward the head .   The combustion apparatus according to claim 1, further comprising a rectifying means for rectifying a flow of air flowing in from the inflow port.   The combustion apparatus according to claim 1, wherein the plurality of swirl flow generating portions are formed by cutting and raising a cylindrical wall of the combustion cylinder.

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