JPH01302004A - combustion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device used in domestic water heaters, heating equipment, and the like.

2. Description of the Related Art As shown in FIG. 2, a conventional combustion device of this type includes an outer cylinder 3 facing a combustion chamber 2 having a water can part 1 on the side wall, and a cylinder 3 provided concentrically on the inner circumference of the outer cylinder 3. , a flame-holding tube 5 having a plurality of air jet holes 4 in multiple stages on its outer periphery; an air cylinder 7 having a plurality of air inflow holes 6 at one end and an opening at the other end; a fuel supply device 8 provided approximately in the center of the fuel supply device 8; and a stirring body having an opening in the center on the opening side of the air cylinder 7 in front of the fuel supply device 8 and a plurality of cut and raised portions on the outer periphery. 9, the fuel supplied from the fuel supply device 8, the primary air supplied from the agitator 9 via the air cylinder 7, and the secondary air supplied from the flame stabilizing cylinder 5 are mixed and combusted. . It became like °C.

Problems to be Solved by the Invention However, in the above configuration, the space between the stirring body 9 and the air jet hole 4 of the flame stabilizing cylinder 5 becomes a mixture vaporization region, and C○
Although it is possible to maintain good combustion without generating dust or soot, a part of the mixture of air and fuel becomes a circulating flow that circulates to the agitator 9 along the inner wall of the flame stabilizing tube 5. This circulating flow adheres to the inner wall of the flame-holding cylinder 5 and the surface of the agitator 9, so when the combustion device is stopped, the adhering air-fuel mixture evaporates, producing odor and coke, or the adhering air-fuel mixture turns into tar and constantly The problem was that it generated an odor.

The present invention solves this conventional problem by preventing part of the mixture of air and fuel from forming a circulating flow, thereby preventing odor, CO generation, and tar generation when combustion is stopped. The purpose is to

Means for Solving the Problems In order to solve the above problems, the combustion device of the present invention has an outer periphery facing the combustion chamber, a flame-holding tube provided concentrically on the inner periphery of the outer cylinder, and a plurality of flame-holding tubes provided at one end. An air cylinder having several air inflow holes and an opening at the other end, a firing material supply device installed approximately in the center of the air cylinder, and a center portion located on the opening side of the air cylinder in front of the fuel supply device. a stirring body having an opening at the outer periphery and a plurality of cut and raised portions on the outer periphery; has a plurality of air blow-off holes near the stirring body, and the distance between the air blow-off holes on the far side of the stirring body and the air blow-off holes on the vicinity side is equal to or greater than the pitch of the air blow-off holes between the plurality of stages. It is something that

Effect The present invention maintains good combustion without generating CO, soot, etc. with the above-described configuration, and the mixture of secondary air and fuel is passed through the air jet hole of the flame stabilizing cylinder provided near the stirring body. Since the air from the combustion chamber does not form a circulating flow, the mixture does not adhere to the inner wall of the flame-holding cylinder or the surface of the agitator, and no odor or CO is generated after the combustion equipment is stopped. This also prevents the formation of tar.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIG. 1, 11 is a combustion chamber having a water base portion 12;
13 is an outer cylinder facing the combustion chamber 11; 14 is a flame-holding cylinder provided concentrically on the inner periphery of the outer cylinder 13; 15 is a flame-holding cylinder provided at one end with a plurality of air inflow holes 16 at the other end; An air cylinder having an opening, 17 a fuel supply device provided approximately at the center of the air cylinder 15, 18 an ignition electrode for igniting the fuel supply device 17, and 19 air in front of the fuel supply device 17. The stirring body 22 has an opening 20 in the center on the opening side of the cylinder 15 and a plurality of cut and raised parts 21 on the outer periphery.
A plurality of air ejection holes A are provided in a plurality of stages on the outer periphery of No. 4 on the side farther from the stirring body 19, and air ejection holes B1 are provided in plural stages on the side closer to the agitation body 19. If the pitch of A22 is a, and the pitch between the air blowing hole B23 and the air blowing hole A22 closest to the air blowing hole B23 among the air blowing holes A22 is b, then b≧a.
The air ejection holes B23 are arranged so that 24 is a fan for blowing combustion air, 25 is a blower motor,
Reference numeral 26 denotes a combustion air blowing passage, 27 refers to primary air in which the combustion air blown from the air passage 26 is blown into the air cylinder 15 through the air inflow hole 16 of the air cylinder 15, and 28 refers to the outer cylinder. 13, the flame stabilizing tube 14, and the air cylinder 15.

In the above configuration, fuel is sent from the fuel supply device 17 into the flame stabilizing tube 14 through the opening 20 of the agitator 19.

Combustion air is sent into the air cylinder 15 through the air passage 26 by the air blower motor 25 and the fan 24, and a part of it is sent into the air cylinder 15 through the air inlet hole 16 of the air cylinder 15, and is then sent to the stirring body 1 as secondary air 27.
9 through the opening 20 and cut and raised portion 21 of the flame stabilizing tube 14.
sent within. In addition, a part of the air passes through a secondary air passage 29 formed between the outer cylinder 13, the flame stabilizing cylinder 14, and the air cylinder 15,
Air jet hole A22 and air jet hole B23 of flame stabilizing tube 14
It is sent into the flame-holding tube 14 via the flame-holding cylinder 14.

When the ignition electrode 18 is energized, a spark is discharged between the electrodes, and the discharge energy causes the fuel supplied from the fuel supply device 17 to flow into the flame stabilizing tube 14 through the opening 20 and cut-and-raised portion 21 of the stirring body 19. The mixture with the sent primary air 27 is ignited to form a flame, and the air jet hole A2 of the flame stabilizing tube 14 is then ignited.
2 and the secondary air 28 sent into the flame stabilizing tube 14 through the air jet hole B23 and combusts.

A part of the mixture of fuel and primary air 27 flows along the inner wall of the flame stabilizing tube 14 and the stirring body 19 because the space surrounded by the mixture, the flame stabilizing tube 14 and the stirring body 19 becomes a negative pressure area. However, the air jet hole B of the flame stabilizing tube 14
Since a flame is formed at the air ejection hole B23 by the secondary air 228 from B23, the formation of a circulating flow is prevented. In addition, fuel and primary air 27 are generated by the combustion heat of the flame in the air jet hole B23.
At the same time as promoting the vaporization of the mixture with
Among the air injection holes A22, mixing is promoted in the area between the air injection hole A22 that is closest to the air injection hole B23, and the flame formed at the air injection hole A22 is CO2.
In addition to maintaining good combustion without generating soot or the like, a part of the mixture of fuel and primary air 27 becomes a circulating flow, and the flame stabilizing tube 1
After the combustion device is stopped, the air-fuel mixture that adheres to the wall surface of 4 and the surface of the agitator 19 evaporates and generates odor and CO, and the adhering air-fuel mixture turns into tar and generates an odor. It has the effect of eliminating things.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

The air jet hole B of the flame stabilizing cylinder is provided near the agitator, and the pitch between the air jet hole B and the air jet hole A closest to the air jet hole B among the multiple stages of air jet holes A on the far side is adjusted to Blowout hole A
Because they are arranged at a pitch greater than the pitch between the two, the flame formed at the air nozzle A achieves good combustion without CO or soot, and part of the mixture of fuel and primary air becomes a circulating flow. This prevents the adhering air-fuel mixture from adhering to the wall of the flame-holding cylinder and the surface of the agitator, and from evaporating and producing odor and CO after combustion has stopped, and from turning the adhering air-fuel mixture into tar and producing odor. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a combustion device according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional combustion device. 13...Outer cylinder, 14...Flame-holding port, 16
... air cylinder, 17 ... fuel supply device,
19... Stirring body, 22... Air outlet A, 23... Air outlet B, 27...
-Secondary air, 28...Secondary air. Name of agent: Patent attorney Toshio Nakao and 1 other person + 5
−”! Qi Stomach and 7 Doryo /4g3//

Claims (1)

[Claims] An outer cylinder facing the combustion chamber, a flame-holding cylinder provided concentrically on the inner periphery of the outer cylinder, and an air cylinder having a plurality of air inflow holes at one end and an opening at the other end; A fuel supply device provided approximately in the center of the air cylinder; and a stirring body having an opening in the center and a plurality of cut and raised portions on the outer periphery on the side of the opening of the air cylinder in front of the fuel supply device. The flame stabilizing tube has a plurality of air ejection holes in multiple stages on the outer periphery of the flame stabilizing cylinder on the side far from the agitation body, and a plurality of air ejection holes on the side near the agitation body, and has air ejection holes on the side far from the agitation body. A combustion device in which the distance between a nozzle hole and a nearby air nozzle is equal to or greater than the pitch of the air nozzles between multiple stages.