JPS63247515A - Gas burner - Google Patents

Abstract

PURPOSE:To obtain a large calorific value, increase a turn-down ratio and reduce the noise of combustion, by a method wherein a combustion surface-forming wall body, on which the outlet port of secondary air feeding passage and flame keeping air ports, is extended upwardly from the end of one side of a flame port ejecting the mixture gas upwardly. CONSTITUTION:Mixture gas, ejected out of flame ports 5, is burnt to form flames on the flame ports 5 and high-temperature gas, including unburnt gas, rises along wall bodies 3, 4 while secondary air for combustion is diffused from discharging ports 14 into the high-temperature gas to mix the air and burn the unburnt gas in the high- temperature gas whereby flames F are formed in a condition that they are adhered to the combustion surfaces 3a, 4a of the wall bodies 3, 4. The flames are formed only on the lower parts of the wall bodies 3, 4 upon low input and the upper end of the flames F rises in accordance with the increase of an input while the flames F are formed to the vicinity of the upper part of the wall bodies upon high input. Flame keeping-air holes 11, communicating with the secondary air supplying passages, are formed on the wall bodies 3, 4 near the flame ports 5 between the fuel ejecting ports 14 whereby the lift of the flames is prevented by the combustion effected by air from the flame keeping air holes 11 even when the amount of ejected mixture gas is reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a flame port that spouts upward a mixed gas of gas fuel and primary air for combustion from an electric fan, and a combustion space for the flame port. The present invention relates to a gas burner provided with a secondary air supply path that supplies secondary air for combustion from the electric fan.

[Conventional technology]

Conventionally, as shown in FIGS. 6 and 7, a plurality of nozzles (
15) are arranged side by side in an upwardly opening case (16), each nozzle (15) has a large number of flame ports (17) lined up in a straight line, and is connected to an electric fan (18). (1
9) and gas fuel supply (20) to the mixing pipe (21) attached to each nozzle (15), and the electric fan (18)
A secondary air supply path (22) connected to the casing (16) is connected to the lower part of the case (16), and a mixed gas of gas fuel and combustion air is jetted upward from the flame port (17) to form a flame. , and was configured to supply combustion secondary air to the combustion space (23) for the flame port (17) from between the case (16) and the nozzle (15) or between the nozzles (15).

[Problem that the invention seeks to solve]

However, when the calorific value of the burner is increased, the calorific value per area of the flame port (17) increases, and there is an upper limit to the calorific value per area of the flame port (17) in order to maintain good combustion. It is impossible to obtain an extremely large calorific value with a compact burner, the turndown ratio is small, and furthermore, there are drawbacks such as an increase in combustion noise as the calorific value increases.

An object of the present invention is to enable an extremely large amount of heat to be obtained with a compact burner, increase the turndown ratio, and reduce combustion noise regardless of the amount of heat generated. .

[Means for solving problems]

A characteristic configuration of the present invention is that a combustion surface forming wall body extending upward from one side end of a flame port that blows out a mixed gas of gas fuel and primary air for combustion from an electric fan upward is connected to the flame A discharge port of a secondary air supply path connected to the electric fan, located outside the portion corresponding to the upward extension of the mouth, and provided in an inclined or vertical posture, the higher the position, the further away from the portion corresponding to the upward extension of the flame mouth. are continuously or intermittently formed on the combustion surface forming wall body from both ends of one side edge of the flame port along an imaginary line extending upward on the surface of the wall body, and Flame-holding air holes are formed in the combustion surface forming wall near each of the discharge ports and communicating with the secondary air supply path, and the effects thereof are as follows. It is as follows.

[For production]

In other words, as shown in FIGS. 4 and 5, when the mixed gas ejected from the flame port (5) is combusted, a flame is formed at the flame port (5), and the high temperature gas including unburned components is combusted. The high-temperature gas rises along the surface-forming walls (3) and (4), and the combustion secondary air from the discharge ports (14) of the walls (3) and (4) diffuses and mixes with the high-temperature gas. Unburned content in the high temperature gas forms the wall (3
), (4), the flame (F) is formed and burns while clinging to the combustion surfaces (3a) and (4a).

When the input is low, the flame (F) is formed only at the bottom of the walls (3) and (4) as shown in Figure 4, and as the input increases, the upper end of the flame (F) (3)
, (4), and at high input, the flame (F) rises along the wall (3) as shown in Figure 5.

(4) is formed over the entire height or near the top. That is, the combustion surfaces of walls (3) and (4) (
3a) and (4a) apparently act as upper flame ports,
The apparent area of the upper flame opening increases or decreases in direct proportion to the input,
Despite wide fluctuations in input, the apparent fluctuations in the amount of heat generated per burner area can be kept small.

Therefore, even though the total calorific value is extremely large considering the fact that it is formed into a compact burner with a small actual flame opening area, the apparent calorific value per flame opening area is kept small and stable combustion is ensured. In turn, the turndown ratio can be significantly increased, and furthermore, combustion noise can be reduced.

In addition, flame stabilizing air holes communicating with the secondary air supply path are arranged in the combustion surface forming wall near each flame port and between the secondary air discharge ports. If the amount of mixed gas spouted upward from the mouth is extremely small,
Even if the amount of secondary air from the discharge port is not reduced at all or very much, flame lift can be sufficiently prevented by combustion of the mixed gas by the secondary air in the flame holding air hole, further increasing the turndown ratio. can.

〔Effect of the invention〕

As a result, it has a large heating capacity despite its compact size.
It has now become possible to provide a gas burner with extremely excellent overall performance, which can respond to fairly wide fluctuations in heating load and easily prevent environmental deterioration due to noise.

〔Example〕

Next, an embodiment will be shown with reference to FIGS. 1 to 5.

A pair of combustion surface forming walls (3) and (4) are formed in the casing (1) and extend upward from the flame opening forming part (2), and a rectangular flame opening is formed in the flame opening forming part (2). (5) are arranged so that one of their long sides is connected to the wall (3) or (4), and a large number of them are arranged in a straight line and in two rows,
A combustion space (6) for the flame nozzle (5) is formed between opposing combustion surfaces (3a) and (4a) formed by both walls (3) and (4).

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 provided in the flame port forming part (2).
), a nozzle (9) is provided for supplying gas fuel from the primary air supply port (7) into the mixing chamber (8), and an electric fan (12) is connected to the primary air supply port (7). . That is, the gas fuel from the nozzle (9) and the electric fan (12)
The combustion chamber (8) premixes the primary combustion air from the combustion chamber (8), and the mixed gas is ejected upward from the flame port (5).

A secondary air supply path (13) facing the back of both walls (3), (4) is formed inside the casing (1) and connected to the electric fan (12), 4) is located outside of the point (A) corresponding to the upward extension of the flame outlet (5), and the further up the flame outlet (5)
), and the secondary air supply path (13
) A large number of discharge ports (14) are formed in the shape of slits and provided in both walls (3) and (4), respectively. The slit-shaped discharge ports (14) are separated from the wall (3) from each end of the flame port (5) in the longitudinal direction by a bent tongue (10).
Or, arrange them along the imaginary line extending upward on the surface of (4), and place adjacent ones in the row direction of the flame ports (5),
They are arranged close to each other so that the discharge port (14) between them can also be used.

That is, secondary air for combustion from the electric fan (12) is supplied to the combustion space (6) from the slit-shaped discharge port (14), and the mixed gas ejected from the flame port (5) is combusted. In step (5), a flame is formed and the high temperature gas containing unburned gas is transferred to the wall (
3), (4), the combustion secondary air from the discharge port (14) is diffused and mixed with the high temperature gas, the unburned content in the high temperature gas is combusted, and the wall body (3), ( The flame (
F).

When the input is low, flames (F) are formed only at the bottom of the walls (3) and (4), as shown in Figure 4.
As the imp throat increases, the upper end of the flame (F) rises along the walls (3) and (4), and at high input, the flame (F) moves up to the wall (3) and (4) as shown in Figure 5. 3).

(4) is formed over the entire height or near the top of the wall (3), the combustion surface (3a) of (4),
(4a) shows that the hexagram acts as an upper flame, and the area of one upper flame increases or decreases in direct proportion to the input, and the apparent area of the upper flame increases or decreases in direct proportion to the input. It is constructed in such a way that fluctuations in the amount of heat generated per mouth area can be suppressed to a small extent, and the total amount of heat generated can be extremely large despite the fact that it is formed into a compact burner with a small actual mouth area, which in turn significantly increases the turndown ratio. Furthermore, combustion noise can be reduced.

The combustion surface forming walls (3) and (4) are provided with flame holding air holes (11) that communicate with the secondary air supply path (13).
5) They are arranged close to each other and between the discharge ports (14) to ensure flame stability even if the amount of mixed gas spouted upward from the flame ports (5) is extremely small. The structure is such that flame lift can be prevented by combustion using air from the air hole (11).

[Another example]

Next, another embodiment will be described.

The primary mixing configuration for supplying a mixed gas of gas fuel and primary air for combustion to the flame port (5) can be changed as appropriate.

The number, arrangement, and shape of the flame vents (5) can be changed as appropriate. For example, the flame vents can be arranged in a row with only one wall (3), or the flame vents (5) can be semicircular. It's okay.

The shapes of the combustion surface forming walls (3) and (4) extending upward from one side edge of the flame port (5) can be changed as appropriate;
For example, it may be formed into a folded-up plate shape, or may have a vertical portion.

The number, arrangement, shape, size, etc. of the flame stabilizing air holes (11) can be changed as appropriate.

A gas burner may be formed by arranging a plurality of the structures shown in the embodiments described above, and the specific configuration of the gas burner can be modified as appropriate.

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

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, FIG. 1 is a sectional view, FIG. 2 is a view taken along the line nn in FIG. 1, and FIG. 3 is a m-m in FIG. 2. The line arrow view, FIGS. 4 and 5 are explanatory diagrams of the combustion state. Figures 6 and 7 show conventional examples;
The figure is a sectional view, and FIG. 7 is a partially omitted side view. (3), (4)...Wall body for forming combustion surface, (
3a), (4a)... combustion surface, (5)...
... Flame mouth, (6) ... Combustion space, (11)
...Flame holding air hole, (12) ...Electric fan, (13) ...Secondary air supply path, (14
)... Discharge port, (A)... Location equivalent to the upward extension of the flame port.

Claims (1)

[Claims] A flame port (5) is provided for upwardly spouting a mixed gas of gas fuel and primary air for combustion from an electric fan (12), and the electric fan (
12) A gas burner provided with a secondary air supply path (13) for supplying secondary air for combustion from the flame port (5).
Combustion surface forming wall (3) extending upward from one side edge of the
, (4) to the point (A) corresponding to the upward extension of the flame outlet (5).
The flame outlet (5
) is provided in an inclined or vertical position away from the upwardly extended portion (A), and the discharge port (14) of the secondary air supply path (13) is connected to the combustion surface forming wall (3), (4). ,
The wall body (3
), (4) are formed continuously or intermittently along an upwardly extending imaginary line, and are arranged between the discharge ports (14) near each of the flame ports (5). The secondary air supply path (
13) A gas burner formed with a flame-holding air hole (11) that communicates with the gas burner.