JPH06331109A - Gas burner - Google Patents

Abstract

PURPOSE:To obtain stabilized combustion at all times by preventing lifting phenomenon and restraining vibration in low oxygen time in a gas burner. CONSTITUTION:In a gas burner, provided with a multitude of main flame ports 2 bored in parallel on the flame port forming surface 1 of a burner main body A and provided with decelerating flame ports 3 for sticktight burners at both sides of the flame port forming surface 1, the flame port forming surface 1 is formed so as to be shallow groove type, such as a reverse chevron type or the like which has no-flame port sections 4 higher than the main flame ports 2, at both sides of the main flame ports 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas burner used for combustion equipment such as a gas water heater.

[0002]

2. Description of the Related Art As a conventional technique, for example, as shown in Japanese Utility Model Laid-Open No. 63-61618, and as shown in FIG. In a gas burner provided with flame openings 2'and sleeve flame openings 3'on both sides of the flame opening formation surface 1 ', the flame opening formation surface 1'is formed in a convex shape, and the main flame opening 2'is formed. There is a structure in which the entire top of the convex flame port forming surface 1'is drilled (hereinafter referred to as Conventional Example 1).

Further, as shown in Japanese Utility Model Laid-Open No. 3-5029 and as shown in FIG. 6, the burner body A "
The main flame port 2 ″ is provided on the flame port forming surface 1 ″ of the main flame port 2 ″, and the flat plate portions 4 ″ having the shielding plates 12 ″ immersed therein are projected on both sides of the main flame port 2 ″ so as to project. ″ Is formed into a substantially M shape, and the main flame port 2 ″
There is also a structure having a substantially M-shaped flame port forming surface 1 ″ (hereinafter referred to as Conventional Example 2).

[0004]

In the conventional example 1 of the prior art, the main flame opening 2'is formed in the entire top of the convex flame opening forming surface 1 ', so that the main flame opening 2'is formed. Since the flame a'formed is wide, the flame a'is unstable due to the influence of the secondary air flow e'outside the sleeve flame port 3'and lift is likely to occur. Therefore, the combustion noise is high,
There was a problem that it was not possible to increase the load and vibration noise was generated during low oxygen.

Further, in the conventional example 2, since the main flame port 2 "is perforated all over to the side surface of the flame port forming surface 1" having a substantially M shape, the flame formed at the main flame port 2 "is formed. Since the base part "a" extends outward, the secondary air flow e "is not only affected, but the flame port forming surface 1" is formed in a substantially M-shape, but the secondary air circulation region is formed. There is a problem that the (negative pressure portion) is not stably formed.

In view of the above problems of the prior art, the present invention prevents the lifting phenomenon and suppresses vibration during low oxygen, without providing complicated flame holding means (flame stabilizing means). The purpose is to provide a gas burner that suppresses even this and can always achieve stable combustion.

[0007]

In order to achieve the above object, the gas burner of the present invention is mainly provided on the flame mouth forming surface 1 of the burner main body A as shown in the drawings corresponding to the embodiments. In a gas burner having a flame outlet 2 and sleeve flame outlets 3 on both sides of the flame outlet forming surface 1, the flame outlet forming surface 1 is on both sides of the main flame outlet 2 higher than the main flame outlet 2 It is characterized in that it is formed in a groove shape having the mouth portion 4.

[0008]

In the gas burner of the present invention, since the flame port forming surface 1 is formed in a groove shape, the direction of jetting the mixed gas from the main flame port 2 is directed to the upper center. Therefore, after the mixed gas is jetted from the main flame port 2. , The collision and the flame are promoted so that their mixing and combustion are promoted.

Further, since the non-flame openings 4 higher than the main flame openings 2 are provided on both sides of the main flame openings 2, the secondary air does not go around to the main flame base (near the main flame openings). , Flameless mouth 4
Since the recirculation region (negative pressure part) formed in the upper space of the is stably present, it is possible to obtain a sufficient flame holding effect for the main flame.

As a result, the flame is sufficiently stabilized, the lifting phenomenon is prevented, and the vibration during low oxygen is suppressed. Further, the load on the flame mouth can be increased as the stability of the flame is improved.

[0011]

Embodiments of the gas burner of the present invention will be described below with reference to the drawings.

In the drawing, A is a burner body, and a top flame-portion forming surface 1 on which a plurality of slit-shaped main flame ports are co-perforated at regular intervals is provided on both sides of the main flame port 2 from the main flame port 2. It is formed in a groove shape having a high flameless opening 4.

The groove-shaped flame port forming surface 1 is, for example, an inverted mountain-shaped groove which is obliquely recessed as in the embodiment shown in FIG. 1, and the embodiment shown in FIG. like,
The concave groove shape is formed by immersing it in a plane shape, or the concave groove shape is formed by immersing in an arc shape as in the embodiment shown in FIG. The groove 4 is formed in a relatively shallow groove shape having a small height difference h from the portion 4.

Reference numeral 3 denotes sleeve flame outlets provided on both sides of the flame outlet forming surface 1. A flame retaining plate 6 is fixed to a side wall 5 of the burner body A, and a series of sleeve flame outlets 3 is provided on both sides of the flame outlet forming surface 1. Is formed, and the sleeve flame port 3 is formed as a moderating flame port by refracting the flame holding plate 6. Reference numeral 7 denotes a sleeve fire gas passage that communicates with the series of sleeve flame openings 3 and is formed in a plurality of side walls 5 of the burner body A.

Reference numeral 4 denotes a flameless opening portion provided on both sides of a main flame opening 2 formed in parallel in the groove-shaped flame opening forming surface 1, and is formed at a position higher than the main flame opening 2. .

In the above structure, the mixed gas that has passed through the mixed gas passage 8 of the burner body A is jetted from the main flame port 2 and the sleeve flame port 3 and burned.

In the mixed gas ejected from the main flame port 2, the flame port forming surface 1 on which the main flame port 2 is formed is formed in a groove shape such as an inverted chevron shape or a concave shape. Since the jet direction b is jetted with a vector directed to the upper center, the mixed gas jets from the main flame port 2 and then collides with and impinges. Therefore,
The mixing and combustion are promoted to form a straight main flame a having a long flame length.

The mixed gas ejected from the sleeve flame outlet 3 is decelerated and ejected to form a series of sleeve flames in the sleeve flame outlet 3 in a stable manner to ensure the main flame a of the main flame outlet 2. Hold the flame.

Further, since the flameless openings 4 higher than the main flame 2 are provided on both sides of the main flame 2, the secondary air flow goes around to the base of the main flame a (near the main flame). In this case, the circulation region (negative pressure portion) c formed in the upper space 9 of the flameless opening portion 4 exists stably. Therefore, the flame holding effect against the main flame a can be sufficiently obtained in combination with the flame holding by the sleeve fire.

As a result, the main flame a is sufficiently stabilized, the lifting phenomenon is prevented, and the vibration during low oxygen is also suppressed.
Further, the flame mouth load can be increased with the improvement in stability of the main flame a.

A comparison of the lift limits of the above-described gas burner of the present invention and the conventional gas burner was measured based on the relationship between the flame mouth load and the primary air entrainment ratio (relative to the theoretical air amount), as shown in the graph of FIG. Met. As is clear from this graph, the gas burner of the present invention has a high lift limit and can stably burn up to a large flame tip load.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. is there.

[0023]

According to the gas burner of the present invention, the flame port forming surface is formed in the shape of a groove in which a large number of main flame ports are formed in parallel, and both sides of the main flame port are flameless higher than the main flame port. By providing the mouth, the secondary air does not go around to the flame base and the flame is not disturbed, and the recirculation region formed in the space above the flameless mouth can be sufficiently developed and present. , The stability of the main flame is improved.

That is, a flame that is difficult to lift is formed. Therefore, the vibration generated when the oxygen level is low is suppressed, and the load can be increased.

Further, since combustion is performed without disturbing the flame base, it is possible to reduce combustion noise. Excellent effect such as.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a gas burner of the present invention.

FIG. 2 is a cross-sectional view of an example in which the shape of the groove on the flame port forming surface is different.

FIG. 3 is a cross-sectional view of an example in which the shape of the groove on the flame port forming surface is different.

FIG. 4 is a measurement graph comparing lift limits.

FIG. 5 is a cross-sectional view of a main part of Conventional Example 1.

FIG. 6 is a cross-sectional view of a main part of Conventional Example 2.

[Explanation of symbols]

 A Burner body 1 Flame opening surface 2 Main flame opening 3 Sleeve flame opening 4 Flameless opening

Claims (1)

[Claims] 1. A main flame mouth (2) is provided on a flame mouth forming surface (1) of a burner body (A), and sleeve flame mouths (3) are provided on both sides of the flame mouth forming surface (1). In the gas burner, the flame port forming surface (1) is formed in a groove shape having a flameless port portion (4) higher than the main flame port (2) on both sides of the main flame port (2). .