JPH01281312A - Gas burner body - Google Patents

Abstract

PURPOSE:To provide a gas burner body which reduces the generation of noise and enables maintenance of a stable flame even when the variable range of a combustion range is increased, by a method wherein the curvature of the wave crest of a porous burner head is set to a value lower than that of a wave bottom. CONSTITUTION:A burner head 2 is formed by a porous material made of a metal, and is formed in a waveform in cross section having alternately a wave crest 3 with a low curvature and a wave bottom 4 with a high curvature. When gas premixed in an air ratio of at least 1.0 is fed, air-fuel mixture flows through an air-fuel mixture chamber 15. Further, it passes through a multihole for intercommunicating the back and the surface of a porous burner head 2 made of a metal, and ignited on the surface of the burner head 2 for combustion. Flame is burnt such that a main flame F1 is stabilized on the surface of the wave bottom 4 and the base part of the main flame F1 is stabilized on the surface of the wave crest 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a gas burner body in which a porous body made of metal or ceramic whose upper and lower surfaces are connected is used for the burner head, and particularly relates to a gas burner body for household use. It relates to gas burner bodies used in gas appliances such as water heaters and bathtubs.

[Conventional technology]

This type of gas burner body is made by pressing a steel plate.
Suction section 25, mixing section 26 and burner head section 27
are molded symmetrically and joined facing each other,
Furthermore, there is one in which a plurality of main gas burners 29 (shown in FIGS. 6 and 7) having a burner head portion 27 and a burner port surface 28 joined to the upper part thereof are mounted in parallel on a burner support.

Combustion of gas in the gas burner body with such a configuration involves mixing the gas ejected into the mixing section 26 of the main gas burner 29 with the primary air sucked in within the mixing section 26, and directing this premixed gas to the flame port surface 28. The flame is ejected from a main flame port 30 such as a hole or slit, and secondary air is introduced to cause combustion.

[Problem to be solved by the invention]

With the above-mentioned configuration and combustion gas burner body, a stable flame can be obtained with a balance between the premixed gas ejection speed from the main flame port and the combustion speed, but in the case of water heaters, etc. Since the mixed gas injection speed is faster and combustion is performed with excess air, the flame lifts or blows off, making it impossible to obtain a stable flame. The variable range of the combustion amount is small (when the maximum combustion amount is 1, the ratio of the minimum combustion amount to the maximum combustion amount is 1)
/6), there is a risk of blow-off if the variable range of combustion amount is narrowed to 176 or less.To improve this problem, a flame holding port is installed around the main flame port to stabilize the main flame, There are gas burner units that allow the variable range of combustion amount to be up to 1/8, but in the case of these gas burner units, combustion is performed by introducing secondary air into the flame, so this secondary air is introduced into the flame. So-called combustion noise, such as swirl noise or collision sound, is generated when the combustion occurs. Moreover, in recent years, in order to make the combustion chamber smaller and gas appliances smaller, the flame length has been shortened and fishtail-shaped combustion has been carried out, but this type of combustion produces a louder combustion noise and is extremely harsh. be.

On the other hand, a gas burner body has been developed that does not use secondary air, but instead uses air mixed with fuel gas in advance, and has a plate-shaped porous body in the burner head. , there is no problem with combustion noise, but when the air ratio is set above 1.4, the flame starts to lift, and when it is set below 1.3, the gas burns inside the porous body, causing the porous body to become red hot. This causes wear and tear, and the combustion amount cannot be varied over a wide range.

In view of the above-mentioned problems of the prior art, the present invention has low combustion noise, maintains a stable flame even when the combustion amount variable range is as wide as 1/10, and has the advantage that the flame lifts or does not occur during combustion. The object of the present invention is to provide a gas burner body that does not blow off.

c? Means for Solving Jn] In order to achieve the above object, the gas burner body of the present invention has the following features:
A burner head made of a porous body having a wave crest having a smaller curvature than the wave bottom and communicating between the upper and lower surfaces is provided at the opening of the mixed gas chamber.

In this gas burner body, a metal plate may be provided on the back surface of the wave crest of the porous burner head.

Further, the gas burner body of the present invention is provided with a burner head made of a porous body having a wave crest having a smaller curvature than the wave bottom and communicating between the upper and lower surfaces at the opening of the mixed gas chamber, and
A low combustion gas burner is provided in contact with the back surface of the wave crest of this porous burner head, and holes or slits are provided in the portion of the wave crest of the porous burner head that corresponds to the flame opening of the low combustion gas burner. It is.

[For production]

In the gas burner body, the burner head is formed of a porous body whose upper and lower surfaces communicate with each other, so that the mixed gas can pass through the connected pores and burn on the entire surface of the porous burner head. It may be supplied as a complete mixed gas with an air ratio of 1.0 or more, and since the wave crests of the porous burner head are formed with a small curvature compared to the wave bottoms, the mixed gas can pass through easily. The amount is larger on the surface of the wave bottom than on the surface of the wave crest, and therefore combustion is obtained in which the main flame is formed on the surface of the wave bottom and the flame holding is formed on the surface of the wave crest.

Further, when a metal plate is provided on the back surface of the wave ridges of the porous burner head, the wave ridge portions of the porous burner head, which are easily heated and red-hot during combustion, are cooled and prevented from becoming red-hot. That is,
When the wave crest portion of the porous burner head becomes red hot, combustion occurs inside the porous body at the wave crest portion, and the porous body may be worn out, so these can be prevented by preventing red heat.

In addition, the gas burner body of the present invention is provided with a low combustion gas burner in contact with the back surface of the wave ridge of the porous burner head provided at the opening of the mixed gas chamber, and is compatible with the flame port of the low combustion gas burner. Since holes or slits are provided in the wave crests of the porous burner head, the wave crests are cooled by the heat radiation from the low combustion gas burner and/or the low combustion gas, thereby preventing red heat at the wave crests. In addition, the flame holding effect at the crest of the wave is improved, and combustion can be performed safely with the minimum amount of combustion.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

1-1-Kanichido In Figures 1 and 2, 1 is a gas burner body.

Reference numeral 2 denotes a burner head, which is made of a metal porous body with pores communicating between the upper and lower surfaces, and its cross section has a wave crest 3 with a small curvature and a wave with a larger curvature than the curvature of the wave crest 3. It is formed into a corrugated shape that alternates with the bottom 4.

5 is a box-shaped burner frame with a bottom, and two mixed gas supply ports 8.9 are provided near the bottom 7 of the right side wall 6 (in FIG. 1); Front and rear side walls10.11
Step portions 12 are provided on the left and right sides (left and right in FIG. 2) for placing the throat 2 on the burner at a position corresponding to the wave height of the burner head 2 from their upper ends.

Reference numeral 13 denotes a metal fitting for fixing the burner head 2 after the burner head 2 is placed on the stepped portion 12 of the burner frame 5, and is fixed to the upper end of the burner frame 5 with screws 14.

15 is a mixed gas chamber formed between the bottom 7 of the burner frame 5 and the burner head 2.

In the gas burner body 1 having the above configuration, when a gas mixed in advance at an air ratio of 1.0 or more is supplied under pressure from the mixed gas supply ports 8 and 9, the mixed gas passes through the mixed gas chamber 15, and then passes through the metal porous body. It exits to the surface of the burner head 2 through the pores that communicate from the back surface of the burner head 2 to the surface, and is ignited and burned on the surface. During this combustion, the flame burns in the form of a two-dot chain line shown in FIG. That is, the main flame F1 is burned on the surface of the wave bottom 4 having a large curvature, and the base of the main flame F1 is flame-held on the surface of the wave crest 3 having a small curvature.

In fact, both the main flame and the flame-holding flame increase as the air ratio increases from 1.0, and when the air ratio reaches around 1.6, the flame begins to lift, but during this period, the combustion noise is low, and the combustion Good combustion was achieved with no CO gas detected in the gas.

! - Boat - LJ, - As shown in Fig. 3, the back surface 16 of the wave crest 3a with a small curvature
Thin steel plate! The burner head 2a made of a metal porous body having pores communicating between the upper and lower surfaces to which the burner head 7 is welded and fixed is replaced with the burner head 2 of Example 1, and the burner head 2a is replaced with the step part 1 of the burner frame 5.
This is a gas burner body 1 with a configuration attached to 2.

In this gas burner body l, substantially the same l as in Example 1 is used.
l! l state is obtained, and when the air ratio is around 1.0, the wave peak 3a
The red-hot state was reduced, and a more favorable combustion state was obtained.

JLLi As shown in FIG. 4, a slit 2 is formed at the top of the wave crest 3b with a small curvature, corresponding to the nozzle hole 19 of the low combustion amount burner 18.
0, and the low combustion amount burner 18 is connected to the wave peak 3b.
The burner head 2 is made of a porous metal body that is provided in contact with the back surface 16 of the burner head 2 and has pores that communicate between the upper and lower surfaces.
b is replaced with the burner head 2 of Example 1, and the burner frame 5 is used.
This is a gas burner body l configured to be attached to a step portion 12 of.

In this gas burner body 1, the air ratio is 1.1 to 1.
．． 6, the combustion state was almost the same as in Example 1, but
The air ratio is between less than 1.1 and 1.0, or more than 1.6 and 1
．． 8, the low combustion amount burner 18 is placed on the surface of the wave crest 3b.
A flame holding effect can be obtained by the mixed gas from the air ratio of 1.
Even between 0 and 168, extremely stable combustion conditions were obtained.

As shown in Fig. 5, the nozzle 19 of the low combustion amount burner
A metal porous body having a corrugated base 4c with a large curvature is placed between these low combustion I burners 18, and the left and right ends 21 of the corrugated base 4c are the low combustion burners 1.
A burner head 2c made of a metal porous body having pores that communicate between the upper and lower surfaces, which is provided in contact with the side surface of the burner frame 5, is replaced with the burner head 2 of the first embodiment.
This is a gas burner body 1 with a configuration attached to 2.

In this gas burner body 1, the same oak combustion state as in Example 3 was obtained.

In the above embodiment, the gas supplied to the mixed gas chamber 15 was completely mixed in advance.
A plurality of gas supply ports may be provided in the mixed gas chamber I5 to simultaneously supply fuel gas and air.

Furthermore, in the above embodiment, the gas supply ports 8.9 to the mixed gas chamber 15 are two in number, but the burner head 2
In order to uniformly permeate the surface of the gas mixture, it is preferable to increase or decrease the amount as appropriate depending on the size of the mixed gas chamber 15.

〔Effect of the invention〕

Since the present invention has the above-mentioned configuration, the combustion noise is small, and even if the variable range of combustion amount is set as wide as 1/10, a stable flame can be maintained, and the flame can be lifted during combustion. or the advantage of no blow-off, and
Since the length of the flame can be shortened, the height of the combustion chamber can be lowered, which also has the advantage of making the gas appliance more compact.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a gas burner body according to the present invention;
The figure is an A-A sectional view of Figure 1, Figure 3 is an enlarged sectional view of the main part of the burner head in a separate layer, Figure 4 is an enlarged sectional view of the main part of the burner head in a separate layer, and Figure 5 is an enlarged sectional view of the main part of the burner head in a separate layer. FIGS. 6 and 7, which are enlarged cross-sectional views of main parts of a burner head with separate layers, are explanatory views of conventional examples. 1 gas burner body 2, 2a, 2b, 2c burner head 3, 3a,
3b, 3c Wave crest 4 Wave bottom 5 Burner frame 6, 10.11
Side wall 7 bottom 8.9 Gas supply port

Claims (3)

[Claims] (1) A gas burner body characterized in that a burner head made of a porous body having wave crests with a smaller curvature than the wave bottoms and communicating between the upper and lower surfaces is provided at the opening of the mixed gas chamber. (2) The gas burner body according to claim 1, wherein a metal plate is erected on the back surface of the wave crest. (3) At the opening of the mixed gas chamber, a burner head made of a porous body having a wave crest with a small curvature compared to the wave bottom and communicating between the upper and lower surfaces is provided, and the burner head of this porous body is A low combustion gas burner is placed in contact with the back of the wave crest,
A gas burner body characterized in that holes or slits are provided at the crests of the porous burner head corresponding to the flame openings of the low combustion rate gas burner.