JPS60149814A - Tip mixing type blast burner - Google Patents

Abstract

PURPOSE:To enable high-load combustion though combustion air at comparatively low pressure is applied, by a method wherein power of fuel gas in the direction facing toward an opening part of an inner case is reduced by a dispersion plate and it is enabled to perform favorably mixing of the combustion air with the fuel gas. CONSTITUTION:As gas to be spouted from an introducing hole of the gas is made to disperse and flow in a radial direction along the base of an inner case 3 by a dispersion plate 5 and primary air to be introduced through introducing holes 6... of the primary air collides with a gas flow in a state meeting at about right angles with the gas flow, though both the gas and air flows are mixed extremely favorably, that air-fuel mixture does not burn due to a matter that a quantity of the primary air is small, but flows toward a widening-out opening part 3a of the inner case 3. Then the air-fuel mixture collides with secondary air to be introduced almost from a sideward direction through a secondary air introducing slit or hole 7 at the inside of the widening-out opening part 3a, both of which are mixed favorably with each other and burnt.

Description

[Detailed description of the invention] The present invention is directed to a premix burner of completely new construction.

For example, in order to make household gas water heaters and gas space heaters more compact, it is necessary to develop burners capable of high-load combustion.

By the way, as a high-load combustion burner that uses city gas with a relatively low supply pressure, a typical mixed plast burner is one that blows out combustion air at a relatively high pressure and suctions and mixes the fuel gas. Conventional pre-mixed Plastburners require a high blowout pressure of combustion air, which results in larger fans, higher noise, and the disadvantages of backfires. have.

Therefore, it is possible to mix the low-pressure supply gas and the low-pressure supply air in advance and to perform short flame combustion, but in order to do this, it is necessary to ensure that the gas and air are mixed very well, and the low-pressure supply and overheating of the burner combustion section due to short flame combustion - to be reliably prevented. It is necessary to solve this technical problem.

An object of the present invention is to solve the above-mentioned problems and provide a pre-mixed plast-coute capable of high-load combustion while using relatively low-pressure combustion air.

EMBODIMENT OF THE INVENTION Hereinafter, first, an embodiment of a pre-mixing type plasticizer according to the present invention will be described with reference to the drawings.

As shown in the conceptual diagram in Figure @1, fire ejection opening (1a)
Approximately -20 myrb is applied to the lower side of the cylindrical outer case t1+ with a drawn end and a bottom using a blower (not shown) or the like.
A combustion air introduction pipe (2) to which combustion air is forcibly supplied at a relatively low supply pressure of 0 is connected to the combustion air introduction pipe (2), and a pre-finished cylindrical bottomed pipe for flame formation is connected inside the outer case fi+. An inner case (3) is inserted, and a low pressure fuel gas introduction pipe (4) is connected to the bottom of the inner case (3). ,
A gas dispersion plate (5) is disposed directly above the gas introduction hole (4a) of the gas introduction pipe (4) to face the gas introduction hole (4a).

A plurality of secondary air introduction holes (6) for combustion are formed around the gas introduction hole (4a) at the bottom of the inner case (3), and the inner case ( 3) A plurality of secondary combustion air introduction slits (holes may be used) (7) are provided in the pre-adjusted part around the tip opening (3a).
...is formed. In addition, the secondary air introduction hole (6
) is relatively small so that the mixing ratio of the supply air and fuel gas does not reach the flammable range, while the secondary air introduction slit or hole (7) The total opening area of ... is made relatively large so that a sufficient amount of air can be supplied for sufficient combustion.

Furthermore, a very narrow annular gap (8) is provided between the inner 111 surface of the outer case (1) and the peripheral edge of the inner case (3), and the air that blows out through the annular gap allows the outer case to It is configured to cool the constricted end portion around the fire ejection opening (la) and thereby prevent that portion from overheating. (9) in the figure is the igniter.

In the pre-mixing type Plastburner with the above configuration, the gas ejected from the gas introduction hole (4a) is dispersed and flowed in the radial direction along the bottom surface of the inner case (3) by the first dispersion plate (5). The primary air introduced from the air introduction hole (6) is balanced in a position almost perpendicular to the gas flow, so the two mix extremely well, but since the primary air is small, The mixture does not burn and the inner case (3
) flows toward the advance payment 11 mouth (8a), and.

Inside the advance opening (8a), a large amount of secondary air is introduced from approximately the side through the secondary air slit or hole (7), and both are maintained in good condition. Mix and burn.

In this way, the combustion air and fuel gas should be mixed very well.

In addition to the fact that the supply pressures of both of the two are low and the force of the fuel gas toward the opening (8a) of the inner case (3) is reduced by the dispersion plate (5), the non-lδ
It is possible to perform good short and large moxibustion high load combustion, and yellow chips that tend to occur with premix burners are also less likely to occur.

In addition, the entire inner case (3) for forming the flame surface is inserted into the outer case (1) through which combustion air flows, so that it is always cooled, and the amount of secondary air is reduced. This combined with the fact that the bottom of the inner case (3) is designed to prevent combustion from occurring, makes it possible to extremely effectively prevent overheating of the burner. It can be composed of

FIG. 2 shows a specific example of a pre-mixed plastoburner by Akira Kiro.

Its basic configuration is almost the same as the above embodiment, but
Additional explanations include that the burner is mostly made of sheet metal, and that the combustion air introduction pipe (2) and outer case fl)
A rectifying annular loop (10) is formed between the
Another example is the provision of a frame monitoring window 1111.

In summary, the pre-mixed plastic burner according to the present invention has a combustion air introduction pipe connected to a bottomed cylindrical outer case equipped with an opening for blowing out the flame, and a bottomed tube for flame formation inside the outer case. A cylindrical inner case is inserted, a fuel gas introduction pipe is connected to the bottom of the inner case, and a gas distribution plate is arranged in the inner case so as to face the gas introduction hole of the gas introduction pipe, and , a combustion secondary air inlet hole with a relatively small area is bored around the gas inlet hole at the bottom of the inner case, and a relatively large area secondary combustion air inlet hole is formed around the tip opening of the inner case. Next, air introduction slits or holes are formed. It has the following characteristics.

The functions and effects exhibited by the above characteristic configuration are as follows.

That is, as described in detail in the description of the embodiment, one dispersion plate is particularly provided so that the fuel gas, the secondary air for combustion, and the secondary air are collided and mixed extremely well within the inner case for forming a large flame. In addition, by reducing the momentum of the fuel gas in the direction toward the combustion part, it becomes possible to perform very good short flame combustion.

In addition, the entire inner case for forming the large sword is inserted into the outer case where combustion air flows, so that it is constantly cooled, and the secondary air is reduced to prevent combustion at the bottom of the inner case. By doing so, overheating of the burner can be extremely effectively prevented, and the entire burner can now be constructed from inexpensive metal materials such as sheet metal.

[Brief explanation of drawings]

The drawings show an embodiment of a pre-mixed plastoburner according to the invention, and FIG. 1 is a schematic sectional view; FIG. 2 is a sectional view showing a specific configuration. +l)・・・Outer case, (la)・・・・・・
Opening for flame ejection. (2)... Combustion air introduction pipe, (3)...
...Inner case, (8a) ...Inner case (3
) tip opening, (4)...Fuel gas introduction pipe,
(4a)...Gas introduction hole, 15)...
Gas distribution plate, (6)・・・・・・−Next′! I! Air introduction hole, (7)...Secondary air introduction slit or hole. Agent Patent Attorney Osamu Kitamura

Claims (1)

[Claims] A bottomed cylindrical outer case with a flame ejection opening (la) [
A combustion air introduction pipe (2) is connected to 11, and a bottomed cylindrical inner case (3) for flame formation is connected inside the outer case fl).
), connect the fuel gas introduction pipe (4) to the bottom of the inner case (3), and insert the gas distribution plate ( 5) is disposed within the inner case (3), and the inner case (
3) A combustion air inlet hole (6) of a relatively small area is provided around the gas inlet hole (4a) at the bottom of the
At the same time, open the tip opening (8) of the Oa inner case (3).
a) l! A pre-mixing type plasto burner characterized in that a relatively large-area combustion secondary air introduction slit or hole (7) is formed in the tl surround.