JPH0213201B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for arranging flame ports that eject upward a mixed gas of gas fuel and primary air for combustion from an electric fan, and The present invention relates to a gas burner having a secondary air supply path for supplying combustion secondary air from the electric fan between the chambers.

[Conventional technology]

Conventionally, as shown in FIGS. 8 and 9, a plurality of nozzles 15 are arranged side by side in a case 16 with an upward opening, and a large number of flame ports 17 are arranged linearly side by side in each nozzle 15, and an electric fan is constructed. The primary air supply path 19 and the gas fuel supply path 20 connected to the nozzle 18 are connected to the mixing pipe 21 attached to each nozzle 15, and the electric fan 18
A secondary air supply path 22 connected to the flame outlet 17 is connected to the lower part of the case 16 so that a mixed gas of gas fuel and combustion air is jetted upward from the flame outlet 17 to form a flame. The secondary air for combustion was supplied to the combustion air 23 from between the case 16 and the nozzle 15 or between the nozzles.

In addition, as shown in Japanese Patent Application Laid-Open No. 58-182024, the outlet of the secondary air supply path is formed on the inclined walls installed on both sides of the upward-facing burner, and the outlet is spaced apart from the inclined wall above the burner. Some were constructed in such a way that secondary combustion air was blown onto the flame formed in the sloping state from an outlet in the inclined wall.

[Problem that the invention seeks to solve]

However, since all gas burners are configured to form a flame only above the flame port with a constant opening area, increasing the heat generation amount of the burner increases the heat generation amount per area of the flame port 17, and Since there is an upper limit to the calorific value per area of 17 in order to maintain good combustion, it is impossible to obtain an extremely large calorific value with a compact burner, the turndown ratio becomes small, and furthermore, the calorific value decreases. There were drawbacks such as increased combustion noise as the fuel increased.

The purpose of the present invention is to make it possible to obtain an extremely large calorific value with a compact burner, increase the turndown ratio, and reduce combustion noise regardless of the calorific value. be.

[Means for solving problems]

The characteristic configuration of the present invention is that a combustion surface forming wall body for making the flame from the flame spout which blows out upward a mixed gas of gas fuel and primary air for combustion from an electric fan stick to the flame spout forming part. of the uneven edge of the flame opening so as to extend in a state that is continuous with the convex part, and the upward gap formed between the uneven edge of the flame opening forming part and the lower part of the combustion surface forming wall body is connected to the flame. A combustion surface forming wall body is formed at the mouth, and a combustion surface forming wall body is disposed outside a portion corresponding to the upward extension of the flame mouth, and at least a lower portion of the combustion surface forming wall body is arranged at a position corresponding to the upward extension of the flame mouth. A discharge port of the secondary air supply path is formed in the combustion surface forming wall, and is arranged on each side of the burner port, and a flame is directed away from the burner port. The combustion surface forming walls are arranged so that their phases are different in the juxtaposed direction, and are arranged continuously or intermittently over almost the entire height of the combustion surface forming wall, and the effects are as follows. be.

[Effect]

The greatest feature of the present invention is that it is configured so that the flame from the flame port is formed in a state where it clings to the wall for forming a combustion surface, and in order to achieve this combustion state, the following (a) to (b) are carried out. ) has been combined.

(a) A flame hole is formed between the uneven edge of the flame hole forming part and the lower part of the combustion surface forming wall, in other words,
The structure is such that the inclined lower part of the combustion surface forming wall is not separated from the flame port, so that the flame can reliably rise along the combustion surface forming wall.

(b) Discharge ports for secondary air for combustion formed in the wall for forming a combustion surface are arranged on both sides of the flame port so that they are out of phase with respect to the flame port in the direction in which the flame ports are arranged side by side,
The secondary air for combustion is configured to flow over the flame and be mixed into the flame. In other words, the external force acting in the direction of moving the flame away from the combustion surface forming wall as the secondary combustion air is ejected is prevented, so that the flame reliably ascends through the combustion surface forming wall. Configure.

(c) Discharge ports for secondary air for combustion are formed continuously or intermittently over almost the entire height of the wall for forming a combustion surface, so that the secondary air supply state for combustion as described in item (b) above is controlled by flame. The structure is such that the flame is maintained regardless of the length of time and the flame surely rises along the combustion surface forming wall.

That is, as shown in FIGS. 3 and 4, when the mixed gas ejected from the flame nozzle 5 is combusted, a flame is formed at the flame nozzle 5, and the high-temperature gas containing unburned components is transferred to the combustion surface forming wall. The high-temperature gas rises along the walls 3 and 4, and the secondary combustion air from the discharge ports 14 of the walls 3 and 4 diffuses and mixes with the high-temperature gas, and the unburned content in the high-temperature gas is transferred to the walls 3 and 4. A 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 lower part of the walls 3 and 4 as shown in FIG.
4, and when the impact is high, the flame F is formed over the entire height of the walls 3, 4, or almost to the top, as shown in FIG. In other words, the combustion surfaces 3a, 4a of the walls 3, 4 act as apparent flame ports, and the apparent flame port area increases or decreases in direct proportion to the input, and the apparent flame area increases or decreases in direct proportion to the input. Fluctuations in the amount of heat generated per burner area can be suppressed to a small level.

Therefore, even though the total calorific value is extremely large considering the compact burner with a small actual burner area, the apparent calorific value per burner area is kept small and stable combustion is ensured. can be maintained, and the turndown ratio can be significantly increased, and furthermore,
Combustion noise can be reduced.

〔Effect of the invention〕

As a result, it has a large heating capacity despite its compact size, can handle wide fluctuations in heating load, and can easily prevent environmental deterioration due to noise. We are now able to provide a gas burner with extremely excellent overall performance.

〔Example〕

Next, an example will be shown with reference to FIGS. 1 to 4.

A pair of combustion surface forming walls 3 and 4 are formed on the gauging 1 and extend upward from the flame spout forming portion 2 and both lateral ends of the flame spout forming portion 2, respectively. The lower parts of the combustion surface forming walls 3 and 4 are connected to each other, and a rectangular upwardly facing part is formed between the uneven edge of the flame opening forming part 2 and the lower part of the combustion surface forming walls 3 and 4. A large number of flame ports 5 are arranged in parallel in a straight line, and a combustion space 6 for the flame port 5 is formed between opposing combustion surfaces 3a and 4a formed by both walls 3 and 4. It has been formed.

A mixing chamber 8 communicating with the primary air supply path 7 and the flame port 5 above the primary air supply path 7 is connected to the primary air supply path 7 below the flame port forming part 2 by a partition wall 9a,
9b and 9c, the gas fuel supply pipe 10 is arranged inside the primary air supply path 7, and a large number of gas nozzles 10a are directed upward while being dispersed over the entire length of the two rows of flame nozzle groups. The primary air supply path 7 is formed in the supply pipe 10, and the air supply port 11 to the mixing chamber 8 is arranged between the burner port groups in plan view and arranged in the column direction of the burner port groups in the partition wall 9a, An electric fan 12 is connected to the primary air supply path 7. That is, the gas fuel from the supply pipe 10 and the primary combustion air from the electric fan 12 are premixed in the mixing chamber 8, and the mixed gas is spouted upward from the flame port 5.

Secondary air supply path 13 facing the back side of both walls 3 and 4
is formed inside the casing 1 to form the electric fan 12.
, both walls 3 and 4 are located outside of the point A corresponding to the upward extension of the flame outlet 5, and are arranged in an inclined position where the upper side is further away from the point A corresponding to the upward extension of the flame outlet 5. Numerous discharge ports 1 of the secondary air supply path 13
4 is formed into a slit shape and provided on both wall bodies 3 and 4, respectively. These slit-shaped discharge ports 14 are arranged on both sides of the burner port 5, and are arranged in a state where the phase is different from the burner port 5 in the direction in which the burner ports are arranged side by side. 3 and 4 are arranged continuously over almost the entire height, and adjacent burner ports 5 in the row direction are arranged close to each other so that the discharge ports 14 between them are also used.

That is, secondary combustion air from the electric fan 12 is supplied from the slit-shaped discharge port 14 to the combustion air space 6, and the mixed gas ejected from the flame port 5 is combusted to form a flame at the flame port 5. High-temperature gas containing unburned matter is raised along the walls 3 and 4, secondary air for combustion from the discharge port 14 is diffused and mixed with the high-temperature gas, and the unburned matter in the high-temperature gas is combusted. It is configured so that the flame F is formed while clinging to the combustion surfaces 3a and 4a of the bodies 3 and 4.

When the input is low, the flame F is formed only at the lower part of the walls 3 and 4 as shown in FIG. 3, and as the input increases, the upper end of the flame
4, and at high impact, the flame F is formed over the entire height of the walls 3, 4, or near the top, as shown in FIG.
The combustion surfaces 3a and 4a act as an apparent flame outlet, and the apparent flame area increases or decreases in direct proportion to the input, and regardless of wide fluctuations in the input, the heat generated per apparent flame area remains constant. It is constructed in such a way that fluctuations in the amount of heat can be suppressed to a small extent, and the total calorific value can be extremely large despite the fact that it is formed into a compact burner with a small actual burner area, which in turn can significantly increase the turndown ratio. is designed to reduce combustion noise.

[Another example]

Next, another embodiment will be described.

The primary mixing configuration for supplying the 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 ports 5 can be changed as appropriate.
For example, as shown in FIG. 5, the burner ports may be arranged in a row so that there is only one wall 3, or the burner port 5 may be semicircular.

The shape 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, they may be formed into a bent plate shape as shown in FIG. 6, or formed into a bent plate shape as shown in FIG. As shown, part 3 in vertical position
b, 4b may be provided.

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.

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention,
Figure 1 is a sectional view, Figure 2 is a partially omitted perspective view, and Figure 3 is a partially omitted perspective view.
4 and 4 are explanatory diagrams of the combustion state. 5 to 7 show different embodiments of the present invention, with FIG. 5 being a partially omitted perspective view, and FIGS. 6 and 7 being sectional views. 8 and 9 show a conventional example, with FIG. 8 being a sectional view and FIG. 9 being a partially omitted side view. 3, 4...Wall body for forming combustion surface, 3a, 4a...
Combustion surface, 5... Flame mouth, 6... Combustion space, 12...
Electric fan, 13...Secondary air supply path, 14...
Discharge port, A... Point corresponding to the upward extension of the flame port.

Claims (1)

[Scope of Claims] 1 Flame ports 5 for ejecting a mixed gas of gas fuel and primary air for combustion from an electric fan 12 upward are arranged in parallel, and the electric fan 12 is located between the combustion chambers 6 and the flame ports 5. A gas burner is provided with a secondary air supply path 13 for supplying secondary air for combustion from the flame outlet, and the combustion surface forming walls 3 and 4 for making the flame from the flame outlet 5 stick to the flame outlet. The uneven edge of the forming part 2 extends upward in a state that is continuous with the convex part, and is provided between the uneven edge of the flame opening forming part 2 and the lower part of the combustion surface forming walls 3 and 4. The upward gap thus formed is formed in the flame port 5, and the combustion surface forming walls 3 and 4 are disposed outside the portion A corresponding to the upward extension of the flame port 5, and the combustion surface forming wall 3 . 4, and are arranged on each side of the burner port 5, and are arranged in a state where the phase is different from the burner port 5 in the direction in which the burner ports are arranged side by side, and further, the combustion surface forming wall body Gas burners are arranged continuously or intermittently over almost the entire height of 3 and 4. 2. The gas burner according to claim 1, wherein the discharge port 14 of the secondary air supply path 13 is formed in a slit shape. 3. A large number of the flame ports 5 are arranged in parallel in a straight line, and adjacent ones of the flame ports 5 are arranged close to each other so that the discharge port 14 of the secondary air supply path 13 between them is also used. Claim 1
The gas burner according to item 1 or 2. 4 Flame port groups in which the flame ports 5 are linearly arranged in parallel are arranged in two rows, and the combustion surface forming walls 3 and 4 for each of the burner port group rows are connected to each other so that the combustion surfaces 3a and 4
4. The gas burner according to claim 3, wherein the gas burner is arranged such that the portions a are opposed to each other.