JPH031005A - Flame holding plate for premixing gas burner - Google Patents

Abstract

PURPOSE:To improve a flame holding characteristic and promote a complete combustion by a method wherein projections of each of corrugated plates are formed at certain angles so as to cross slantly to each other with respect to a combustion surface and the adjoining projections of the corrugated plate members are crossed to each other. CONSTITUTION:Each of corrugated plate member 10 is constructed such that some projections 11 are inclined at a certain angle in respect to an axis of each of the corrugated members 10 and its angle is for example 45 deg.. In case that the corrugated members 10 are piled up to each other, the adjoining projections 11 of the corrugated plates are arranged to cross to each other. With such an arrangement, each of the corrugated plates 10 is point-contacted to each other with the adjoining corrugated plates 10 and the projections 11 being placed to contact to each other. Each of the corrugated plates 10 can be piled up without applying any spacers therein and under a condition in which their thicknesses are maintained. Under this condition, several slant clearances formed by the projections 11 of each of the corrugated plates 10 may act as injection holes 12 for pre-mixed gas.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flame-holding plate for a premixed gas burner that improves combustibility and reduces manufacturing costs.

[Conventional technology]

A surface combustion burner, which is a type of premix gas burner, is a type of premix gas burner, as shown in FIGS. 5 and 6. is ejected to form a large number of small flames on the surface of the flame holding plate (1).

In this type of surface combustion burner, in order to prevent heat from the combustion flame from being transmitted to the unburned premixture on the premixture supply side and igniting, the flame stabilizing plate (1) is usually used as a fireproof plate. Furthermore, the above-mentioned combustion flame may escape to the premixture supply side through the nozzle (2) (i.e., backfire), causing the same accident as mentioned above. In order to prevent this, measures are taken to block or prevent backfire, such as flame arresters.

[Problem to be solved by the invention]

By the way, the following problems are known in the flame stabilizing plate for a premixed gas burner having the above configuration.

(1) When burning the fuel, good combustion is achieved on the surface of the flame stabilizing plate by maintaining an optimal balance between the combustion speed and the jetting speed of the premixture.

For this reason, there is a limit to the increase in the combustion load on the flame stabilizing plate, and if the jetting speed of the premixture is increased excessively, a lift occurs in the combustion flame.

(2) Since there is a limit to the amount of increase in combustion surface load, the cooling effect of the flame stabilizing plate by the premixture is small and the flame stabilizing plate easily overheats. Even if materials are made, the premixture supply side may not be able to avoid temperature rise and overheating.

(3) Furthermore, if the flame-holding plate is made of heat-resistant and fire-resistant materials such as ceramics as described above, even if heat transfer to the premixture supply side can be prevented, crack damage caused by thermal stress may occur. Problems remain.

Furthermore, this type of ceramic material is susceptible to impact, requires special care in transportation and handling, and is expensive.

[Means to solve the problem]

This invention was made in order to solve the above-mentioned problem, and in a flame stabilizer for a gas burner that blows out a premixture from a large number of nozzle holes and forms a combustion flame on the surface, the flame stabilizer is mutually connected. It is composed of a large number of corrugated sheet-like members laminated in the thickness direction, and each corrugated sheet-like member has a convex strip that intersects diagonally with respect to the combustion surface (formed at a predetermined angle, and adjacent to each other). This is a flame stabilizing plate for a premixing type gas burner, which is configured such that the convex stripes of the corrugated plate-like member intersect with each other.

[Effect]

According to the flame stabilizing plate for a premixed gas burner according to the present invention,
A jetting hole for the premixture can be formed between each of the protrusions of the corrugated plate-like member. In addition, since the inclination directions of these ejection holes are opposite to each other for each corrugated plate-like member, opposing flow portions are created in the ejected premixture, and the resulting vortex improves flame stability and improves the premixture. Complete combustion is promoted by stirring the mixture.

〔Example〕

1 to 3 show an embodiment of a flame stabilizing plate for a premixed gas burner according to the present invention.

The flame stabilizing plate for a premix gas burner according to the present invention has a structure in which a large number of thin corrugated plate-like members θΦ made of metal or the like are laminated in the thickness direction.

As shown in FIG. 2, each of the above-mentioned corrugated sheet members 0ω has a convex portion (11) inclined at a predetermined angle with respect to the width direction (vertical direction in FIG. 2) of the corrugated sheet member OΦ. In the illustrated embodiment, this angle is 45 degrees.

And when laminating this corrugated sheet member (10),
The protruding stripes θl) of adjacent corrugated plate-like members 0ω are arranged so as to intersect with each other.

As a result, each corrugated sheet member O1]) comes into point contact with the adjacent corrugated sheet member Oω and the convex strip 01), and each corrugated sheet member (11)) has a spacer or the like interposed between them. It is possible to laminate the layers while maintaining the same thickness. In this state, the convex stripes (1
A large number of inclined gaps formed by 1) function as ejection holes 021 for the premixture.

In the flame stabilizing plate (A) having the above configuration, when the premixture is combusted, the ejection direction of the premixture is in the thickness direction of each corrugated plate member (II), as shown in FIGS. The flow becomes opposite to each other, producing a vortex (α) in the figure.As a result, the flame stability of the combustion flame due to the premixture from these nozzle holes 02) is improved, and , Due to the above-mentioned vortex flow, the combustion reaction occurs quickly and the stable combustion range is expanded.

Furthermore, this flame holding plate (A) is a thin corrugated plate member 0 (DO
It is a laminate of ω..., and these corrugated plate-like members (11)G
The premixture nozzle holes Q21 formed by... are thin (and the inclination directions are alternately different, so even if the flame backfires, the flame is divided, dispersed, and extinguished. That is,
This flame holding plate (A) also has the function of a flame arrester.

Furthermore, to explain in detail the premixture ejection holes 021 formed in this flame stabilizer (A), one corrugated plate-like member (10)
Since one ejection hole 02) intersects with the plurality of ejection holes Q21 of the adjacent corrugated plate-like member 0ω, the premixture is mixed and stirred while passing through the flame stabilizer (A), Contributes to further improvement of flammability.

In the above explanation, the flame holding plate (A) is a corrugated sheet member 0ω
In this invention, as shown in FIG. 4, a thin flat plate member Φ is placed between each corrugated member (11)). There may also be a structure in which the layers are laminated with .

〔Effect of the invention〕

As explained above, since the flame stabilizing plate for a premixed gas burner according to the present invention has a structure in which corrugated plate-like members are laminated,
It can be produced at low cost and can withstand harsh handling.

Furthermore, the ejection holes for the premixture are formed by the convex stripes of the corrugated plate-like members, and since the inclination directions of the ejection holes are alternately different for each corrugated plate-like member, the premixture from these ejection holes is A counterflow portion is generated, and the resulting vortex improves flame stability and accelerates the combustion reaction, increasing the stable combustion range.

Furthermore, the premixture jet holes formed in this flame stabilizer are as follows:
Because the inclination directions are alternately opposite, even if the combustion flame backfires, the flame is divided and dispersed and is reliably extinguished.Therefore, the flame stabilizer of the present invention can be used as a flame arrester. It also has the function of 1, and is extremely safe.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a flame stabilizing plate for a premixed gas burner according to the present invention, and FIG. 1 is a perspective view, and FIG.
FIG. 3 is a side view and a plan view, respectively, for explaining the state of the premixture ejected from the flame stabilizing plate. FIG. 4 is a perspective view showing another embodiment of the flame stabilizing plate for a premixed gas burner according to the present invention. 5 and 6 show an example of a conventional flame stabilizing plate, with FIG. 5 being a plan view and FIG. 6 being a longitudinal side view.

Claims (1)

[Claims] (1) Blowing out the premixture from a large number of blowing holes (12),
In a flame stabilizer for a gas burner that forms a combustion flame on its surface, the flame stabilizer (A) is composed of a large number of corrugated plate-like members (10) stacked on each other in the thickness direction, and each of these corrugated plate-like members ( The protrusions (11) of 10) are formed at a predetermined angle so as to intersect diagonally with respect to the combustion surface, and the protrusions (11) of adjacent corrugated plate-like members (10) are A flame-holding plate for a premixed gas burner, characterized in that it is configured in a crossed state.