JPS62108913A - High load burner for low oxygen concentration - Google Patents

Abstract

PURPOSE:To reduce the number of burners and to thin a combustion part by constituting divided burner ports of a plurality of cross burner ports, and providing parallel burner ports on both sides to form a divided burner port group. CONSTITUTION:A main burner body 6 is an integral molding in which a mixing pipe 8, a pressure balancing part 9, a smoothing part 10 and a burner port surface 11 which is at the uppermost port are continuously formed in opposition to a nozzle 7. A large number of slit-like burner ports are provided on a rectangular burner port surface 11.Each of slit-like burner pots consists of cross burner ports 12 provided in a cross manner by rectangularly intercrossing or inclining the long side of the slit-like burner ports with respect to the longitudinal direction and parallel burner ports 13 provided in the parallel direction. Each of cross burner ports 12 constitutes divided burner ports 14 divided into three parts. Parallel burner ports in which the length l2 of the long side of the parallel burner port 13 is set larger than the length l1 where short sides of the cross burner ports 12 which are arranged, are provided on both sides where divided burner ports are arranged. Further, three cross burner ports and two parallel burner ports constitute a divided burner port group 15.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates primarily to household combustion appliances, and relates to a burner that is open indoors and is used as a combustion unit to reduce the thickness of the burner.

BACKGROUND OF THE INVENTION A conventional burner of this type has a slit-shaped burner port 2 and an inclined MX port 3 on a burner surface 1, as shown in FIG. Although the slit-shaped flame opening is easy to process, the short side of the slit is surrounded by air, so the local equivalence ratio (= target mixture ratio/theoretical a, combined ratio) becomes small and blows off. It has the disadvantage that it is easy to cause Therefore, in combustion in a low oxygen concentration atmosphere (so-called oxygen deficiency), blow-off occurs first from the flame on the short side of the slit. Figure 4fa
At t, there are three slanted flame ports that expose the short side, which is weakest to blow-off, for partial introduction of secondary air to the flow of secondary air mainly supplied from both sides of the flame port surface 1;
Parallel flame ports 2 protect each side from direct inflow of secondary air. In this case, burning due to lack of oxygen, parallel flame outlet 2
The flame where the direct inflow of secondary air is blocked by
Adjacent flames are synthesized from the flame corresponding to each slit as the oxygen concentration decreases, and the flame shape is changed to maintain balance with the decrease in combustion speed.

Therefore, the □□□ firing performance in oxygen deficiency is good, but since the introduction of secondary air is mostly blocked by the parallel flame port 2, if you try to increase the capacity of natural firing in this state, the flame length will increase. becomes significantly large, and high-load combustion cannot be expected.

On the other hand, in a burner having a divided burner 5 in which the slit burner 4 is divided into a plurality of pieces as shown in FIG. The introduction of air promotes the mixing of the flame and secondary air, so even if the flame length is increased, the flame length will not increase much and high-load combustion will be achieved.However, when oxygen is deficient, combustion is performed using a slit flame. Since the short side of the opening 5 faces directly in the inflow direction of the secondary air, the blow-off is likely to occur, making it unsuitable for low oxygen concentration combustion.

Problems to be Solved by the Invention As mentioned above, with burners using conventional slit flame ports, it was not possible to simultaneously improve oxygen-deficient combustion performance and combustion capacity. The present invention is aimed at reconciling the conventional conflicting combustion performance, and aims to reduce the thickness of the innards-opening type gift-giving utensil.

Means for Solving the Problems In order to solve the above-mentioned problems and achieve the objects, the burner of the present invention has a rectangular burner opening with a large number of slit-shaped burners. The long sides of the slit-shaped flame openings are arranged in a direction that intersects with the longitudinal direction, and the crossing flame openings are arranged in parallel. In addition to the flame opening, the long side of the parallel flame opening is longer than the distance between the short sides of the slit-shaped flame openings that make up each divided flame opening, and the parallel flame opening is marked with ■ on both sides of the line. A flame outlet is provided, and a divided flame outlet group is formed by a divided flame outlet and a parallel flame outlet.

By configuring the working slit flame ports as a flame port group with the above configuration, secondary air can be smoothly introduced between the flame port groups, and even if the combustion intake is increased, contact with the secondary air is prevented. Because the area is large, the flame length does not increase significantly. In addition, the short sides of the crossed flame openings, which tend to cause blow-off, are surrounded on both sides by parallel flame openings whose long sides are larger than the distance between the short sides, which prevents secondary air from flowing in. This means that stable combustion can be maintained even when there is a lack of oxygen.

Example An embodiment of the present invention will be described below based on the accompanying drawings.

In FIGS. 1 and 2, 6 is a burner body, and 7 is a nozzle. The burner main body 6 is an integrally molded body, and has a mixing tube 8, a pressure equalizing section 9, a rectifying section 10, and a flame opening surface 11 continuously molded at the top, facing the nozzle 7. Rectangular flame outlet 1
1 is provided with a large number of slit-shaped flame ports, and the long sides of the slit-shaped flame ports are perpendicular to the longitudinal direction of the flame port surface 11 (FIG. 2(a)) or intersect at an angle (FIG. 2(a)). (Fig. (b)) It is accommodated by two crossed flame ports 12 provided horizontally and a parallel flame port 13 provided in a parallel direction. The crossed flame ports 12 are divided into three divided flame ports 14 each, and the parallel flame ports 12 are parallel to each other, with the length of the long side of the parallel flame ports 13 being larger by 2 than the distance 11 in which the short sides of the crossed flame ports 12 are lined up. One flame port is placed on both sides of the divided flame ports 14 where the short sides are lined up, and three crossed flame ports and two parallel flame ports form one divided flame port group 15.
It is set up to constitute.

The operation of the configuration described in item 1 will be explained using FIG. 3 as well. The fuel injected from the nozzle 7 sucks primary air due to the ejector effect, flows into the mixing tube 8 and becomes a mixture, and after equalizing the flow velocity distribution in the pressure equalization section 9, it reaches the rectification section 10 to form a uniform mixture. The flame flows out from the slit flame nozzle provided on the flame nozzle surface 11 at a flow rate and collects the flame. At this time, most of the secondary air is supplied from both sides of the burner port surface 110 as shown in FIG. 3Ial. At this time, the secondary air flowing into the flame port surface 11 has the length I of the long side of the parallel flame port 13! 2 is the distance where the short sides of the split flame ports 14 are lined up! , are configured to be larger, so that only a small amount flows into the short flames of the crossed flame ports 12, and the majority flows between the divided flame port groups 15. Therefore, the flame is
As shown in bl, it is divided into each divided flame port group 15, and the contact area with the secondary air increases, so even if the combustion rate is increased, the flame length does not increase so much, and a high rate of combustion is achieved.

On the other hand, in the case of oxygen deficiency, as mentioned above, the parallel flame ports 13 prevent direct inflow of secondary air into the shorter sides of the crossed flame ports 12, so blow-off is less likely to occur.
Blow-off is started from the atmosphere side of the parallel burner port 13 as shown in ot. However, the central part side of the flame outlet surface 11 has a crossed flame outlet 1.
Since the flame is thermally depleted on the short side of the fuel cell 2, the entire structure does not blow off, and stable combustion can be maintained even in a low oxygen concentration atmosphere.

These features are shown in FIGS. 5 and 6.

Figure 5 shows the characteristics for high-load combustion, and the exhaust gas characteristics are expressed by σzo■2 at the outlet of the combustion chamber (not shown) equipped with a heat exchanger for the combustion acid expressed by the supply gas pressure. This is what is shown. In a conventional burner as shown in FIG. 4 1al, the inflow of secondary air is blocked as shown by the curve of conventional example a, so as the gas pressure is increased, the flame length increases and Co is generated. Therefore, it is necessary to reduce the amount of combustion acid per burner and increase the number of burners, making it impossible to reduce the thickness of the combustion section. In a conventional burner as shown in Fig. 4, 1al, a split flame is formed and the flame length becomes low, as shown by the curve in the conventional example, so even if the gas pressure is increased, the generation of CO is suppressed, and the burner It is possible to reduce the amount of heat per burner, and the thickness of the combustion part can be reduced. In the present invention, since split flames are formed, almost the same performance can be obtained.

Furthermore, the thermal sintering characteristics under low oxygen concentration are shown in FIG.

In a conventional burner like the one shown in Figure 4 (bl), as the oxygen concentration decreases, the short side of the slit burner immediately blows off, causing a large amount of unnatural components to pass through the flame surface. Therefore, high-load combustion is possible with such a burner, but oxygen-deficient combustion is not good.On the other hand, in a burner like the one shown in Figure 4 (8L1, the conventional example a
As shown by the curve, as the oxygen concentration decreases, the flame form changes while maintaining a balance with the air-fuel mixture injection speed, thus maintaining stable combustion even in the low oxygen concentration region. However, in this case burner 1
The number of combustibles per book is about half that of the others. In the present invention, the flame shape does not change, but the short side of the slit burner, which is most likely to cause blow-off, is parallel to the burner to prevent direct exaggeration of secondary air. Due to the flame effect, blow-off does not occur even in low oxygen concentration regions.

Effects of the Invention As is clear from the above explanation, the high-load burner for low oxygen concentration of the present invention provides the following effects.

(1) By configuring a divided flame port with a plurality of intersecting flame ports and providing parallel flame ports on both sides to form one divided flame port group,
Since the split flame is formed and secondary air is effectively supplied, the flame length does not increase even if the amount of heat sintered is increased, and the amount of combustion acid per burner can be reduced, which reduces the number of burners. By reducing this, the combustion section can be made thinner.

(2) The short sides of the crossed flame ports, which are most likely to cause blow-off, should be placed on both sides where the short sides of the cross flame ports are lined up, with the long sides of the parallel flame ports being longer than the length of the short sides. Therefore, direct inflow of secondary air is prevented even in the case of oxygen deficiency, and stable combustion can be maintained even in the low oxygen concentration region due to the mutual thermal flame effect of the parallel flame ports and the crossed flame ports.

(3) By using a slit flame spout, the flame spout can be created by simply punching a slit in a sheet metal, and the mixing tube and other parts can be integrally molded, making manufacturing easier and reducing costs.

[Brief explanation of drawings]

Fig. 4 1al and fbl are a top view and a side view of a burner showing one embodiment of the present invention; 11 is an enlarged plan view of the same main part, FIG. 4 1b+ is an enlarged plan view of the main part of another embodiment, FIG. is a partial enlarged view of the new piece as seen from the side in the longitudinal direction of the flame outlet, Fig. 3 1ot is a partially enlarged cross-sectional view of the flame-shaped flame during oxygen deficiency as seen from the side in the short direction of the flame outlet, and Fig. 4 1al
is a partially enlarged view of the flame port surface of a conventional burner, FIG. 4 1b+ is a partial cross-sectional perspective view of another conventional burner, and FIG. 5 is a characteristic diagram of high-load combustion showing the relationship between supply gas pressure and CO/CO2. 6th
The figure is a characteristic diagram of oxygen-deficient combustion showing the C○/Co2 retention of each burner with respect to the indoor O2 concentration. 11... Burner mouth surface, 12... Cross burner mouth, 13-...
Parallel vent, 14...Divided vent, 15 ・Divided vent group. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5 Brass voice

Claims (1)

[Claims] The long sides of the slit-shaped flame ports are provided in a direction that intersects the longitudinal direction of a rectangular flame port surface having a large number of slit-shaped flame ports, and the parallel flames are provided in a parallel direction. The crossed flame ports are divided into a plurality of divided flame ports, and the length of the parallel flame ports is longer than the distance between the short sides of the slit-shaped flame ports that constitute each of the divided flame ports. A high-load burner for low oxygen concentration, wherein the long sides are long, the parallel burner ports are provided on both sides where the short sides of the split burner ports are lined up, and the split burner ports and the parallel burner ports form a split burner group.