JPH0833188B2 - 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.

[Prior Art] Conventionally, as shown in FIG. 6 and FIG. 7, a plurality of nozzles (15) are arranged side by side in a case (16) having an upward opening, and each nozzle (15) has a flame port (17). ) Are provided in a row at intervals in the row direction, and a primary air supply path (19) and a gas fuel supply path (20) connected to an electric fan (18) are attached to each nozzle (15). The secondary air supply path (22) connected to the mixing pipe (21) and connected to the electric fan (18) is connected 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. Formed continuously or intermittently along a virtual line extending in the mixed gas ejection direction on the surface of the combustion surface forming wall body, and arranged between the discharge ports near each of the flame ports. The flame-holding air hole communicating with the secondary air supply passage is formed in the fuel surface forming wall body, and the function and effect thereof are as follows.

[Work]

That is, as shown in FIG. 4 and FIG.
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, the flame holding air hole communicating with the secondary air supply passage,
Since the combustion surface forming wall is placed near the flame openings and between the secondary air outlets, the mixed gas is generated near the flame openings by the secondary air from the flame holding air holes. Since it can be combusted reliably, the flame-holding action lifts the mixed gas ejected from the flame opening even if the amount of the mixed gas ejected upward from the flame opening is large or extremely small. It is possible to satisfactorily combust while sufficiently preventing the above, and to further increase the turndown ratio.

〔The invention's effect〕

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

〔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. The secondary air for combustion from the outlet (14) is diffused and mixed with the high temperature gas to burn unburned components in the high temperature gas, and the combustion surfaces (3a), (4a) of the wall bodies (3), (4). It is configured to form a flame (F) in a state where it is clinging to.

When the input is low, the flame (F) is formed only in the lower part of the wall bodies (3) and (4) as shown in FIG. 4, and the upper end of the flame (F) increases with the increase of the input. It rises along (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.

The flame-holding air holes (11) communicating with the secondary air supply path (13) are arranged in the combustion surface forming walls (3) and (4) near the respective flame openings (5), and Combustion by air from the flame holding air hole (11) even if the amount of the mixed gas that is formed by arranging it between the discharge ports (14) and ejects upward from the flame port (5) is extremely small. It is configured to prevent flame lift.

[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 for example, they may be formed in the shape of a folded plate or provided with a vertically oriented portion.

The flame holding air holes (11) can be appropriately changed in the number, arrangement, shape, size and the like.

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 a conventional example, FIG. 6 is a sectional view, and FIG. 7 is a partially omitted side view. (W) ... wall for forming combustion surface, (5) ... flame port, (11)
…… Flame holding air vent, (12) …… Electric fan, (13) ……
Secondary air supply path, (14) …… Discharge port.

Claims (1)

[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)
Is formed continuously or intermittently along a virtual line extending in the mixed gas jetting direction on the surface of the combustion surface forming wall (W) at a position corresponding to the flame port (5). ) Flame-holding air holes (11) arranged near the respective outlets (14) and communicating with the secondary air supply passage (13) in the combustion surface forming wall (W). Gas burner that has been formed.