JPH01269809A - Combustion equipment - Google Patents

Abstract

PURPOSE:To inhibit the generation of carbon monoxide or soot, by providing a secondary air port whose lowest stream side is closely open, a small number of larger-sized secondary ports on an axis identical to both the upper stream and the lower stream located on the upper stream side, and a throttle cylinder installed to an opening end of an inner cylinder. CONSTITUTION:In the case of excess air, atomized kerosene is mixed with the secondary air ejected from a secondary air port 19 located on the upper side of a larger- sized secondary air port 20, and starts combustion, receives a concentrated supply of the secondary air ejected from the secondary air port 19 in the lowest stream side, then completes its combustion. Since the secondary air ejected from the respective larger-sized secondary air ports 20 is large in volume, the air flows through the center of an inner cylinder 10, passing through cup-shaped flames or atomized kerosene; this secondary air prevents the flames from being cooled while a throttle cylinder 21 collects all the flames and thereby prevent the drop in the temperature of the flames as well so that the generation of carbon monoxide or soot can be inhibited. On the contrary in the case of air shortage, the secondary air ejected from the respective larger-sized air ports 20 is large in volume, which serves to mix with atomized kerosene effectively, thereby inhibiting carbon monoxide or soot.

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. 3, a conventional combustion device of this type has a secondary air chamber 3 formed by an inner cylinder 1 and an outer cylinder 2, and a secondary air chamber 3 formed in the inner cylinder 1 with a rectifying hole 4 opened therein. A primary air chamber 7 in which a nozzle 6 was provided was formed by the bottom and the swirl vane 5 . This one
A blower 8 is connected to the secondary air chamber 7 and the secondary air chamber 3.
The secondary air hole 9 was opened on the circumferential surface of the inner cylinder 1.

The air supplied by the blower 8 passes through the secondary air chamber 3 and is ejected from the secondary air hole 9, and also passes through the primary air chamber 7 and is ejected from the swirl vane 5.

Then, the kerosene spray from the nozzle 6 and the air mix, and when an ignition source is provided, combustion starts and continuous combustion occurs.

Problems to be Solved by the Invention However, in the above configuration, in the case of excess air,
The problem was that the flame was cooled by excess air, making the combustion reaction inactive and producing carbon monoxide and soot. On the other hand, when there is a lack of air, there is a problem in that the kerosene spray and air do not mix well and carbon monoxide and soot are generated.

The present invention is intended to solve such conventional problems, and aims to suppress carbon oxide and soot when there is an excess of air or an air shortage.

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 an inner cylinder and an outer cylinder, a rectifying hole opened at the bottom of the inner cylinder, and a rectifying hole opened at the bottom of the inner cylinder. A swirling vane provided in the cylinder, a primary air chamber formed by the swirling vane and the bottom of the inner cylinder, and provided with a nozzle, and openings on the same axis upstream and downstream on the circumferential surface of the inner cylinder, and secondary air holes that are densely opened on the most downstream side, large-diameter secondary air holes that are opened in small numbers on the same axis upstream and downstream on the upstream side of the secondary air hole on the most downstream side, and It is equipped with an aperture tube provided at the open end of the tube.

Effect of the present invention With the above-described configuration, when there is excess air, the secondary air jetted out from the large-diameter secondary air hole passes through the flame and kerosene spray formed in a cup shape along the inner surface of the inner cylinder. Since the secondary air flows through the center of the cylinder, the flame is not cooled by this secondary air, and since the flame gathers in the throttle tube and prevents the temperature of the flame from decreasing, carbon oxide and soot can be suppressed. On the other hand, if there is a lack of air, the secondary air ejected from each large-diameter secondary air hole has a large amount of air, so it can be mixed with the kerosene spray effectively, suppressing carbon oxide and soot. can be achieved.

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

In FIG. 1, 10 is a cylinder, and an outer cylinder 11 is provided outside the inner cylinder 10, and a secondary air chamber 12 is formed by the inner cylinder 10 and the outer cylinder 11. Reference numeral 13 denotes a rectifying hole, which is opened at the bottom of the inner cylinder 10. A primary air chamber 15 is formed by the rectifying hole 13 and the swirling blade 14, and a nozzle 16,
An ignition electrode 17 is provided. A blower 18 communicates with the primary air chamber 15 and the secondary air chamber 12. Reference numeral 19 denotes a secondary air hole, which is opened on the peripheral surface of the inner cylinder 10 on the same axis downstream, and is tightly opened on the most downstream side (2). 20
are large-diameter secondary air holes, which are opened in small numbers on the same axis upstream and downstream on the upstream side of the secondary air hole 19 on the most downstream side (1). 21
is a diaphragm tube, which is provided at the open end of the inner tube 10.

In the above configuration, the air supplied by the blower 18 passes through the secondary air chamber 12 and is blown out as secondary air from the secondary air hole 19 and the large-diameter secondary air hole 20.
5 and is ejected from the swirl vane 14 as primary air. Then, the kerosene spray from the nozzle 16 and the air mix, and combustion is started by discharge of the ignition electrode 17, resulting in continuous combustion.

As shown in FIG. 2, a recirculation flow 22 is formed near the swirling blade 14 by the primary air and secondary air, and the kerosene spray flows along the inner cylinder 10 due to the attraction of this recirculation flow 22. A flame forms in a cup shape. In case of excess air,
Kerosene is sprayed through the secondary air hole 1 on the upstream side of the large-diameter secondary air hole 20.
It mixes with the secondary air ejected from the secondary air hole 19 and starts combustion, and the combustion is completed by intensively receiving the supply of the secondary air ejected from the secondary air hole 19 on the most downstream side. The secondary air ejected from the individual large-diameter secondary air holes 20 has a large amount of air, so it passes through the cup-shaped flame and kerosene spray and flows through the center of the inner cylinder 10, so this secondary air causes flames to be generated. Since the flame is not cooled and the flame is gathered by the throttle tube 21 to prevent the temperature of the flame from decreasing, there is an effect that carbon oxide and soot can be suppressed.

On the other hand, when there is a slight air shortage, the secondary air jetted out from the secondary air holes 19 cannot be sufficiently mixed with the kerosene spray because the jetting speed is slow;
Since the secondary air blown out from the tank has a large amount of air, it can be effectively mixed with the kerosene spray, which has the effect of suppressing carbon oxide and soot.

Considering excess air, the large-diameter secondary air hole 2o needs to open downstream of the most downstream secondary air hole 19, and the reason for this will be described below. If the large-diameter secondary air hole 20 is opened further downstream of the secondary air hole 19 on the most downstream side, flames and kerosene spray that are intensively supplied with secondary air will not flow out to the center of the inner cylinder 10. The secondary air ejected from the large-diameter secondary air hole 20 cannot pass through the flame and kerosene spray and flow through the center of the inner cylinder 10, and the flame is cooled by this secondary air, making the combustion reaction inactive. Carbon monoxide and soot are generated.

Furthermore, if the large-diameter secondary air hole 20 is opened further downstream, the secondary air ejected from the large-diameter secondary air hole 20 obstructs the formation of the recirculation flow 22, resulting in poor flame stability. This causes carbon monoxide and soot to be generated, and vibration combustion is more likely to occur.

In addition to the effects of the invention, the combustion apparatus of the present invention has the following effects.

(1) Since the large-diameter secondary air hole is opened, in the case of excess air, the excess air, that is, the secondary air jetting out from the large-diameter secondary air hole, will only pass through the flame and kerosene spray. Since the flame is not cooled, -carbon oxide and soot can be suppressed.

When there is a slight air shortage, the secondary air blown out from the large-diameter secondary air holes can be effectively mixed with the kerosene spray, making it possible to suppress carbon monoxide and soot.

(2) Since a throttle tube is provided at the open end of the cylinder, when there is excess air, the flame gathers at the center of the cylinder and prevents the temperature of the flame from decreasing, thereby suppressing carbon oxide and soot.

[Brief explanation of the drawing]

FIG. 1 is an enlarged vertical cross-sectional view of a combustion device according to an embodiment of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of main parts, and FIG. 3 is an enlarged vertical cross-sectional view of a conventional combustion device. 10... Inner cylinder, 11... Outer cylinder, 12.
... Secondary air chamber, 13 ... Rectification hole, 14
...Swirling vane, 15...Primary air chamber,
16...Nozzle, 18...Blower, 19
...Secondary air hole, 20...Large diameter secondary air hole, 21...Aperture tube. Name of agent: Patent attorney Toshi Nakao (1 person: 10)
- 11 yen t3 - 1 rectification Mitsuru / 4 - 1 Ryo Ko Sero N2 figure

Claims (1)

[Claims] A secondary air chamber formed by a bottomed inner cylinder and an outer cylinder, a rectifying hole opened at the bottom of the inner cylinder, a swirl vane provided in the inner cylinder, and the swirl vane and the bottom of the inner cylinder. formed by
A primary air chamber provided with a fuel injection nozzle therein, a blower communicating with the primary air chamber and the secondary air chamber, and openings on the same axis upstream and downstream on the circumferential surface of the inner cylinder, and a secondary air hole that is densely opened on the most downstream side, a small number of large-diameter secondary air holes that are opened on the same axis upstream and downstream on the upstream side of the most downstream secondary air hole, and the inner cylinder. A combustion device comprising a throttle tube provided at the open end of the combustion device.