JPH028606A - 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 Industrial Application The present invention relates to a combustion device used in water heaters and space heaters.

2. Description of the Related Art As shown in FIG. 4, a conventional combustion device of this type includes a secondary air chamber 3 formed by an outer cylinder 1 and air cylinders 2A and 2B, and an air cylinder in which a rectifying hole 4 is opened. A primary air chamber 7 provided with a nozzle/I/6 was formed by the bottom of 2B and the swirling vane 5. A blower 6 is connected to the primary air chamber 7 and the secondary air chamber 3, the secondary air hole 9 is opened to the inner surface of the air cylinder 2A, and the parallel air hole 1 is connected to the air cylinder 2A and the swirl vane 5.
It was opened in the gap between A throttle tube 11 was provided at the open end of the air cylinder 2A.

The air supplied by the blower 8 passed through the secondary air chamber 3 and was blown out from the secondary air hole 9 and the parallel air hole 10, and also passed through the primary air chamber 7 and was completely blown out from the swirl vane 5.

Then, the kerosene spray from the nozzle 6 mixes with the air above, and when an ignition source is provided, combustion starts, producing a cup-shaped flame 1.
2 was formed.

In particular, the parallel air ejected from the parallel air hole 10 is the empty cylinder 2A.
and prevent soot from adhering to the aperture tube 11, and prevent soot from adhering to the aperture tube 11.
suppress the temperature rise. Further, the cup-shaped flame 12 is concentrated by the restrictor tube 11, thereby improving combustion characteristics.

Problems to be Solved by the Invention However, in the above configuration, in the case of excessive static electricity,
The problem was that the flame was cooled by excess air, making the combustion reaction inactive and producing carbon monoxide and soot. Also, if there is a lack of air or the flame is uneven, soot may adhere to the aperture tube, and the temperature of the aperture tube may rise, resulting in high I? i
It had the problem of il corrosion.

The present invention solves such conventional problems, and aims to suppress carbon monoxide and soot in the case of excess air, and to prevent soot from adhering to the aperture tube and high-temperature corrosion of the aperture tube. .

Means for Solving the Problems In order to solve the above problems, the combustion device of the present invention includes a secondary air chamber formed by joining an outer cylinder and an air cylinder via a secondary air plate, and a bottom of the air cylinder. a primary air chamber formed by a swirling vane, and a secondary air hole opened in the circumferential surface of the air cylinder;
The air vent includes an air hole opened in the secondary air plate, and a diaphragm tube provided outside the secondary air plate so as not to block the air hole.

Effects of the present invention: Due to the above-described fi (structure), the air ejected from the air hole flows along the inner surface of the throttle tube, enveloping the cup-shaped flame, and can mix with the fuel without significantly reducing the temperature of this flame. Therefore, even in the case of excess air, the generation of carbon monoxide and soot can be suppressed.In addition, as the air λ slides and flows on the inner surface of the throttle tube, it is possible to prevent soot from adhering to the throttle tube, and to prevent the flow of soot. It can be cooled to prevent high temperature corrosion.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, 13 is an outer cylinder, and air cylinders 14A and 14B are provided inside this outer cylinder 13, and the end of the outer cylinder 13 and the end of the air cylinder 14A are joined via a secondary air plate 15. A secondary air chamber 16 is formed.

17 is a rectifier hole that opens at the bottom of the air cylinder 14B. This is the rectifier hole 1.
7 and the swirling vane 1ts form a primary air chamber 19, and a fuel injection nozzle 20 and an ignition electrode 21 are provided in the primary air chamber 19. 22 is a blower and primary air chamber 1
9 and a secondary air chamber 16. 23 is a secondary air hole, 24 is a large-diameter secondary air hole with an opening σ on the circumferential surface of the air cylinder 14A, and 25 is a parallel air hole that connects the air cylinder 14A and the swirling vane 1.
It is opened in the gap between 8 and 8. Reference numeral 26 is an air hole which is open to the secondary air plate 15, and 27 is a throttle tube provided outside the secondary air plate 15 so as not to block the air hole 26.

In the above configuration, the air supplied by the blower 22 passes through the secondary air chamber 16, passes through the secondary air hole 23, the large-diameter secondary air hole 24, and the air hole 26 as secondary air. The air is completely blown out as air, and it also passes through the primary air chamber 19 and is blown out as primary air from the swirling vanes 18. Then, the kerosene spray from the nozzle 20 and the air mix, and combustion starts due to the discharge of the ignition electrode 21.
A cup-shaped flame 28 is formed.

The secondary air 29 ejected from the air hole 26 flows along the inner surface of the throttle tube 27 and wraps around the cup-shaped flame 28 while being mixed with the fuel without significantly lowering the temperature of the cup-shaped flame 26. Even in the case of excess, it has the effect of suppressing the generation of generalized carbon and soot. In addition, since the secondary air 29 flows along the inner surface of the iris tube 27, even if there is a lack of air or the flame is uneven, the iris tube 27
This has the effect of preventing soot from adhering to the tube 7, and cooling the throttle tube 27 to prevent high-temperature corrosion.

Next, another embodiment of the present invention will be described with reference to FIG. In Fig. 3, the difference from the above embodiment is that an air hole is formed on the l#J discharge end side of the air cylinder 14A with a cut hole so that the direction of secondary air jetting is at a slight angle from the upstream and downstream axis. 30
This is because we have established the following. According to this configuration, the secondary air 31 ejected from the air hole 30 creates the cup-shaped flame 28 while swirling.
Since the air can be mixed with the fuel without substantially lowering the temperature of the air, it has the effect of further suppressing the generation of carbon monoxide and soot even in the case of excess air. Also, secondary air 3
1 covers the entire inner surface of the aperture tube 27 while rotating, which has the effect of further preventing soot from adhering to the aperture tube 27 and preventing high-temperature corrosion of the aperture tube 27.

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

(1) Since the secondary empty space surrounds the cup-shaped flame and can be mixed with fuel without significantly reducing the temperature of the flame, the generation of carbon monoxide and soot can be suppressed even in the case of excess air.

(2) Since the secondary air flows along the inner surface of the throttle tube, it is possible to prevent soot from adhering to the throttle tube, and also to prevent high-temperature corrosion of the throttle tube.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a combustion device according to a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of main parts of the same device, and FIG. 3 is a main part of a combustion device according to a second embodiment of the present invention. FIG. 4 is an enlarged sectional view of a conventional combustion device. 13...Outer cylinder, 14A, 14B...Air cylinder, 15...Secondary air plate, 16...
Secondary air chamber, 17... Rectification hole, 16...
・Swirling vane, 19...Primary air chamber, 23.24
...Secondary air pores, 26.30...7 pores, 2
7...Aperture #) tube. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 14A, +4[1 I7. II? 19 ・- 6,24 A ・- External information exchange air 2nd communication trap provisional 2's air i gE exile 1st '2 air chamber 2nd air electricity viewing Ujikatsu diaphragm 2nd figure Fig. 3

Claims (1)

[Claims] an air cylinder provided inside an outer cylinder and having a rectifying hole opened at the bottom; a secondary air chamber formed by joining an end of this air cylinder and an end of the outer cylinder via a secondary air plate; a swirling vane provided in the air cylinder; a secondary air chamber formed by the swirling vane and the bottom of the air cylinder; a secondary air hole opening downstream from the swirling blade of the air cylinder; A combustion device comprising an air hole opened in a secondary air plate and a throttle pipe provided outside the secondary air plate so as not to block the air hole.