JPH0833187B2 - Gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has a plurality of flame nozzles for ejecting a mixed gas of a gas fuel and a primary air for combustion from an electric fan upward, spaced from each other in the row direction. The present invention relates to a gas burner that is provided in a row in a spaced manner and that has a secondary air supply passage that supplies secondary air for combustion from the electric fan to the flame formed at each of the flame ports.

[Conventional technology]

Conventionally, as shown in FIG. 9 and FIG. 10, a plurality of nozzles (15) are arranged side by side in a case (16) having an upward opening, and each nozzle (15) is provided with a large number of flame openings (17). A mixing pipe (21) in which a primary air supply passage (19) connected to an electric fan (18) and a gas fuel supply passage (20) are provided in a row at intervals in the row direction and are attached to each nozzle (15). The secondary air supply path (22) connected to the electric fan (18) to the case (1
Connected to the lower part of 6) so that a mixed gas of gas fuel and combustion air is ejected upward from the flame opening (17) to form a flame, and a combustion space (23) for the flame opening (17) The secondary combustion air was supplied between the case (16) and the nozzle (15) and between the nozzles (15).

[Problems to be solved by the invention]

However, when the calorific value of the burner is increased, the calorific value per area of the flame opening (17) increases, and the calorific value per area of the flame opening (17) has an upper limit for maintaining good combustion, It is impossible to obtain an extremely large calorific value with a compact burner, the turndown ratio becomes small, and further, the combustion noise increases as the calorific value increases.

It is an object of the present invention to obtain an extremely large calorific value with a compact burner, to increase the turndown ratio, and to reduce the combustion noise regardless of the calorific value. .

[Means for solving problems]

The characteristic configuration of the present invention is for forming a combustion surface that extends in a mixed gas ejection direction from one side edge portion of the plurality of flame openings when viewed in a row direction of the flame openings and forms a combustion surface for each of the flame openings. A wall is provided, and for the wall for forming the combustion surface,
The discharge port of the secondary air supply path provided on the side opposite to the side where the flame port is present is located at a position corresponding to between the adjacent flame ports in the combustion surface forming wall body. It is formed continuously or intermittently along a virtual line extending in the jet direction of the mixed gas on the surface of the combustion surface forming wall body, and protrudes to the side where the flame port is present in the combustion surface forming wall body. The guides are arranged on the combustion surface forming wall body on the left and right sides of each of the discharge ports, and are provided in a state of continuously extending vertically or intermittently. The operation and effect thereof are as follows. Is.

[Operation] That is, as shown in Figs. 4 and 5, the flame port (5)
When the mixed gas ejected from the combustion chamber is combusted, a flame is formed at the flame port (5), and the high-temperature gas containing unburned components rises along the combustion surface forming wall (W), and the high-temperature gas forms a wall. The secondary air for combustion from the discharge port (14) of the body (W) diffuses and mixes to form a flame (F) in a state where unburned components in the high temperature gas cling to the combustion surface of the wall (W). And burn.

When the input is low, the flame (F) is formed only in the lower part of the wall (W) as shown in FIG. 4, and the upper end of the flame (F) becomes the wall (W) as the input increases. As it goes up, the flame (F) is formed over the entire height of the wall body (W) or near the upper portion at the time of high input as shown in FIG. That is, the combustion surface of the wall (W) acts as an apparent flame opening, and the apparent flame opening area increases / decreases in direct proportion to the input, regardless of the large fluctuation of the input. It is possible to suppress the fluctuation of the heat generation amount per area to be small.

Therefore, even if the total calorific value is extremely increased in comparison with the compact burner with a small actual flame opening area,
It is possible to suppress the apparent amount of heat generated per flame opening area, to reliably maintain stable combustion, to significantly increase the turndown ratio, and to reduce combustion noise.

In addition, guides are arranged on both the left and right sides of the discharge port of the secondary air supply passage so as to project to the side where the flame port is present in the combustion surface forming wall body, so that the mixture ejected upward from the flame port is mixed. The gas flows upward along the combustion surface forming wall body in a state of being rectified by the guide, and also the secondary air ejected from the discharge port to the flame surface existing side with respect to the combustion surface forming wall body. It is rectified by the guide, so that the secondary air is gently mixed with the mixed gas, and combustion noise can be further reduced.

Also, the guide is used to reinforce the combustion surface forming wall,
It is also possible to prevent the combustion surface forming wall body from being damaged by thermal strain, and thus it is also effective in improving durability.

〔The invention's effect〕

As a result, it has a large heating capacity in spite of its compact size, can cope with large fluctuations in heating load, can easily and sufficiently prevent environmental deterioration due to noise, and can improve durability,
It has become possible to provide a gas burner with extremely excellent performance as a whole.

〔Example〕

 Next, an embodiment will be described with reference to FIGS.

A large number of rectangular flame outlets (5) for ejecting a mixed gas of gas fuel and primary air for combustion upward are provided in the flame outlet forming portion (2) in the casing (1) in the column direction on each long side. In a state where they are arranged side by side, they are provided in two linear rows at intervals in the row direction.

In the casing (1), a pair of combustion surface forming wall bodies (3) and (4) are respectively provided as combustion surface forming wall bodies (W) with respect to each of the two rows of flame ports (5). When viewed in the column direction of the flame openings (5), they are provided in a state of extending in the mixed gas ejection direction from the side edge side located outside each of the flame openings (5). Then, the surfaces (3a) and (4a) of the two wall bodies (3) and (4) facing each other are used as combustion surfaces for the respective flame ports (5), and the flame is provided between the combustion surfaces (3a) and (4a). A combustion space (6) is formed for each mouth (5).

In the flame port forming part (2), a mixing chamber (8) communicating with all of the flame ports (5) and a primary air supply port (7) communicating with the mixing chamber (8) are formed, and the primary air supply port (7) is formed. ) Is provided in the mixing chamber (8) to supply gas fuel, and the electric fan (12) is connected to the primary air supply port (7). That is, the gas fuel from the nozzle (9) and the primary air for combustion from the electric fan (12) are premixed in the mixing chamber (8), and the mixed gas is ejected upward from the flame port (5). There is.

Inside the casing (1), the secondary air supply passage (13)
Are formed on both walls (3) and (4) on the side opposite to the side where the flame mouth (5) is present, and the secondary air supply path (13) is formed on the electric fan (12). ) And connect both walls (3) and (4) to the upper extension of the flame mouth (5) (A).
The outer side of the flame outlet (5), and the upper portion of the flame mouth (5) is inclined from the upper extension corresponding portion (A).
A large number of discharge ports (14) of the secondary air supply passage (13) are formed in a slit shape and are provided in both wall bodies (3) and (4).
The slit-shaped discharge ports (14) are connected to both wall bodies (3),
(4) In each of them, it is arranged at a position corresponding to between the adjacent flame ports (5) along an imaginary line extending upward on the surface of the wall body (3) or (4). The flame port (5) is defined by a bent tongue piece (10), and adjacent ones in the column direction of the flame port (5) are closely arranged so that the discharge port (14) therebetween is also used. I am doing it.

That is, the secondary air for combustion from the electric fan (12) is supplied to the combustion space (6) from the slit-shaped outlet (14),
The mixed gas ejected from the flame port (5) is burned to form a flame at the flame port (5), and the high temperature gas containing unburned components is raised along the wall bodies (3) and (4) and discharged. Secondary air for combustion is diffused and mixed into the high temperature gas from the outlet (14) to burn unburned components in the high temperature gas, and the combustion surface (3) of the wall bodies (3) and (4)
A flame (F) is formed in a state of being stuck to a) and (4a).

When the input is low, flames (F) are formed only on the lower portions of the walls (3) and (4) as shown in FIG.
As the input increases, the upper end of the flame (F) rises along the walls (3) and (4), and at the time of high input,
As shown in FIG. 5, the flame (F) is formed over the entire height of the wall bodies (3), (4) or near the upper portion thereof, and the combustion surfaces (3a), (of the wall bodies (3), (4) 4a) acts as an apparent flame outlet, and the apparent flame outlet area increases or decreases in direct proportion to the input. It is configured to be small, and the total calorific value can be made extremely large in comparison with the compact burner with a small actual flame opening area, and the turndown ratio can be remarkably increased, and the combustion noise can be reduced. I can do it.

A guide (11) projecting to the side where the flame port (5) is present in the combustion surface forming walls (3) and (4) is provided on the combustion surface forming walls (3) and (4). ) Provided on both left and right sides over the entire length, the mixed gas ejected upward from the flame port (5) is rectified by the guiding action of the left and right guides (11) and the discharge port (14) Secondary air ejected from the combustion space (6) to the left and right guides (1
It is configured so that it is rectified by the guiding action of 1), and combustion noise can be further reduced by gently mixing the mixed gas and secondary air.

The guide (11) is integrally bent with the wall bodies (3) and (4) by pressing the combustion surface forming wall bodies (3) and (4) for forming the discharge port (14). The structure is such that the thermal distortion of the combustion surface forming walls (3), (4) can be suppressed by the reinforcement by the guide (11).

[Another embodiment]

 Next, another embodiment will be described.

The gas mixture of the gas fuel and the primary air for combustion is the flame mouth (5)
The primary mixing configuration for supplying to the above can be changed appropriately.

The number, arrangement, and shape of the flame openings (5) can be appropriately changed. For example, the flame openings are arranged in a row so that only one is provided for the wall body (3), or the flame openings (5) have a semi-circular shape. May be.

When viewed in the row direction of the flame openings (5), the combustion surfaces (3a), (4a) are extended from one side edge of the plurality of flame openings (5) in the mixed gas ejection direction, and The shapes of the combustion surface forming walls (3) and (4) to be formed can be changed as appropriate, and may be formed, for example, in the shape of a bent plate or provided with a vertically oriented portion.

Further, as shown in FIGS. 6 and 7, the combustion surface forming walls (3) and (4) are formed by juxtaposing a large number of unit bodies (B), and upper and lower strip-shaped members provided in the case. Stop member (24),
(25) includes upper and lower engaging pieces (26) of the unit body (B),
(27) may be engaged, the guides (11) may be bent and formed on the left and right sides of each unit body (B), and the discharge port (14) may be formed between the unit bodies (B). If the guide (11)
The height and shape of the can be freely designed, and there is an advantage that it is easy to obtain the optimum combustion state.

The guide (11) may be provided in a state of vertically extending intermittently, or may be arranged without extending over the entire vertical length of the discharge port (14), and the combustion surface forming walls (3), (4). The guide (11) may be formed separately from the guide (11) by increasing the radius of curvature of the guide (11) to increase the rectifying effect. Can be changed.

The gas burner may be formed by arranging a plurality of the structures shown in the above-mentioned embodiments side by side, and the specific configuration of the gas burner may be appropriately changed.

The gas fuel used may be city gas, natural gas, propane gas, or any other gas fuel.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a sectional view, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is III-III in FIG. 4 and 5 are views for explaining the combustion state. 6 and 7 show another embodiment of the present invention. FIG. 6 is a front view of a main part, and FIG. 7 is a VII-V of FIG.
It is a II line arrow line view. FIG. 8 is a cross-sectional view of essential parts showing another embodiment of the present invention. 9 and 10 show a conventional example, FIG. 9 is a sectional view, and FIG. 10 is a partially omitted side view. (W) ... wall for forming combustion surface, (5) ... flame port, (11)
…… Guide, (12) …… Electric fan, (13) …… Secondary air supply path, (14) …… Discharge port, (B) …… Unit unit.

Claims (3)

[Claims] 1. A plurality of flame ports (5) for ejecting a mixed gas of gas fuel and primary air for combustion from an electric fan (12) upward are provided in a row at intervals in the row direction. A gas burner provided with a secondary air supply passage (13) for supplying secondary air for combustion from the electric fan (12) to a flame (F) formed at each of the flame ports (5). Combustion that extends in the mixed gas ejection direction from one side edge of the plurality of flame openings (5) when viewed in the column direction of the flame openings (5) and forms a combustion surface for each of the flame openings (5). The surface forming wall (W) is provided, and the combustion surface forming wall (W) is
The discharge port (14) of the secondary air supply passage (13) provided on the side opposite to the side where the flame port (5) is present is adjacent to the combustion surface forming wall (W). The flame mouth (5)
For forming the combustion surface on the surface of the wall surface (W) for forming the combustion surface continuously or intermittently along an imaginary line extending in the jet direction of the mixed gas. Guides (11) projecting to the side where the flame port (5) is present in the wall body (W) are arranged on the combustion surface forming wall body (W) on both left and right sides of each of the discharge ports (14), Further, a gas burner provided in a state of extending vertically or continuously or intermittently. 2. A discharge port (14) of the secondary air supply path (13)
The gas burner according to claim 1, wherein the guide is formed in a slit shape, and the guide (11) is integrally bent to the combustion surface forming wall body (W). 3. The combustion surface forming wall body (W) is formed by arranging a large number of unit bodies (B) in parallel, and a discharge port (14) of the secondary air supply passage (13) is formed in the unit body (B). B) The gas burner according to claim 1 or 2, which is formed between the gas burners.