JPH11281014A - Gas combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve flow straightening effect of air for combustion in a gas combustor. SOLUTION: This gas combustor is provided with a burner part 2 for burning a mixed gas, a nozzle holder 3 to supply a fuel gas to the burner part 2, a flow straightening mechanism arranged on the upstream side of the burner part 2 and a blower 7 to supply air for combustion to the burner part 2. A gas combustion mechanism has a two-chamber structure which is constituted of a first flow straightening chamber 10 with a first flow straightening plate 11 and a second flow straightening chamber 9 with a second flow straightening plate 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustion device used for a gas heater or a gas water heater, and more particularly to a rectifying mechanism for combustion air provided in a gas combustion device.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional gas combustion apparatus has a plurality of burner units 2 arranged in parallel to burn a mixed gas.
A rectifying chamber 9 disposed upstream of the burner section 2; and a blower 7 positioned upstream of the rectifying chamber 9 and supplying combustion air to the burner section 2 via the rectifying chamber 9. These are housed and attached to a burner case 1 to form an integrated box structure, and a nozzle holder 3 for supplying a fuel gas to the burner section 2 is attached to a lower portion of the box body.
A nozzle 4 whose upper end is directed toward the suction port of the burner unit 2 is provided at the upper part thereof. The fuel gas is supplied through a gas pipe 6 connected to the bottom of the nozzle holder 3.

The burner section 2 and the rectifying chamber 9 are arranged via a plate-shaped rectifying plate 8 having a large number of ventilation holes 8a formed therein, and the flow of combustion air sent from a blower 7 is controlled by the rectifying plate. The air is rectified by passing through a large number of ventilation holes 8a, and the secondary air A is supplied almost uniformly between the burners 2 almost uniformly.

In such a configuration, the combustion air is sent into the rectification chamber 9 by driving the blower 7 during the combustion operation. Part of the combustion air is guided to the nozzle holder 3 side as primary air B, mixed with the fuel gas ejected from the nozzle 4 and supplied as a mixed gas into the burner unit 2. Ignition is caused by the discharge spark of the ignition plug 5, and at the same time, comfortable combustion is continued by the secondary air A supplied from the rectification chamber 9.

[0005]

In the burner section 2 having the above-mentioned structure, various combustion conditions such as the type of fuel gas, the mounting position of the blower, the exhaust method, and the like slightly affect the combustion characteristics, and the air-fuel ratio is disturbed. Or an unbalance between the primary air B and the secondary air A. As a result, the combustion device causes incomplete combustion and generates soot and black smoke.

Conventionally, in order to cope with such inconveniences, the hole diameter and arrangement of the ventilation holes 8a provided in the rectifying plate 8 are devised according to changes in combustion conditions, and the rectifying effect is improved so that stable combustion is always obtained. However, this requires a troublesome operation such as installation and replacement of a new rectifying plate 8, and the ventilation holes of the rectifying plate 8 to be replaced must be non-uniform and complicated. There is no current plate 8
Has also been extremely complicated. Also, it has been extremely difficult to obtain a suitable rectifying effect that can respond to various combustion conditions by relying on one rectifying plate 8 as described above.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a rectifying mechanism of a burner section comprising a first rectifying chamber and a second rectifying chamber to improve the overall rectifying effect. Therefore, it is an object of the present invention to provide a suitable gas combustion apparatus capable of always performing optimal combustion with respect to various combustion conditions by simplifying the processing of each straightening plate.

[0008]

That is, according to the present invention, a burner for burning a mixed gas, a nozzle holder for supplying a fuel gas to the burner, and an upstream of the burner are disposed. Rectifying the combustion air
A second rectifying chamber provided with a rectifying plate, a first rectifying room provided with a first rectifying plate positioned upstream of the second rectifying chamber, and a first rectifying chamber mounted in the first rectifying chamber; And a blower for supplying combustion air to the burner section via the second rectification chamber.

Further, according to the present invention, the blower and the first rectification chamber are integrated,
The first rectification chamber portion is configured to be attached to the second rectification chamber.

Further, according to the present invention, a rectifying member for making the air flow uniform is housed in the first rectifying chamber.

Further, in the present invention described in claim 4, the rectifying member is constituted by a honeycomb rectifying element or a lattice rectifying element.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas combustion apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a gas combustion apparatus (gas burner) to which the present invention is applied, and FIG.
FIG. 7 is a longitudinal sectional view showing another embodiment. To simplify the description, the same reference numerals are used in the following description for portions common to the related art.

In FIG. 1 and FIG. 2, a burner section 2 for combusting a mixed gas, a rectifying mechanism (second rectifying chamber 9) arranged upstream thereof, and a blower 7 located upstream of the second rectifying chamber 9 The configuration in which components such as a nozzle holder 3 for supplying fuel gas to the burner section 2 are housed and attached to the burner case 1 to form an integrated box structure is the same as the conventional gas combustion apparatus shown in FIG. However, according to the present invention, a rectifying mechanism for rectifying the combustion air is provided in a second rectifying chamber 9 corresponding to the rectifying chamber 9 of the conventional device, and another first rectifying chamber arranged upstream of the second rectifying chamber 9. The difference is that a two-chamber structure is used in combination with the rectification chamber 10.

The first rectifying chamber 10 is provided with the second rectifying chamber 9.
A box body attached to the outer side of the burner case 1 on the upstream side of the box body, in which a number of ventilation holes 11a are formed similarly to the second straightening plate 8 provided in the second straightening chamber 9 A screw 13 is fixed to the bottom plate of the burner case 1 with the first rectifying plate 11 interposed therebetween, and a blower 7 is mounted in the air intake hole 10a at the bottom of the box.

The first rectifying chamber 10 and the blower 7 may have a separated type structure which can be detached and attached by screwing a flange portion of the discharge portion 7a. However, as in the present embodiment, the blower with the rectifying chamber is integrated by welding. It may be configured as an assembly as described above.

With such an integrated structure, the connection with the burner case 1 can form the flange portion of the first rectification chamber 10 with the flange portion of the blower 7, so that it can be compared with the case of the above-mentioned separate type structure. In addition to being easy to install, the non-uniformity of the air flow generated near the discharge portion 7a of the blower 7 can be corrected in the first rectification chamber 10 in the next stage as described later. That is, it is possible to supply the assembly as a blower with a rectifying chamber that eliminates uneven air flow.

As described above, the rectifying mechanism for rectifying the combustion air has the two-compartment structure of the first rectification chamber 10 and the second rectification chamber 9, so that the combustion air from the blower 7 is first supplied. The air is sent from the discharge section 7a into the first rectification chamber 10, and is blown out over a wide area of the second rectification chamber 9 while being rectified through the ventilation holes 11a of the first rectification plate 11 provided on the downstream side, and is spread over almost the entire area of the rectification chamber. And evenly dispersed. The dispersed combustion air is rectified again by the ventilation holes 8a of the downstream second rectifying plate 8, and is supplied as a stable secondary air A to almost the entire space between the burners 2 and the second air. Part of the combustion air in the rectification chamber 9 is guided to the nozzle holder 3 as primary air B.

As described above, according to the present embodiment, the air flow blown out from the blower 7 is divided into the first rectifying plate 11 and the second rectifying plate 8.
In this structure, the rectifying effect of the first rectifying plate 11 can be sufficiently compensated for by the rectifying effect of the second rectifying plate 8, so that the rectifying effect is further promoted. The hole diameters and arrangement of the plurality of ventilation holes 8a, 11a formed in the first current plate 11 and the second current plate 8 can be greatly simplified. Therefore, it is possible to easily realize a suitable rectifying mechanism that can sufficiently cope with various combustion conditions such as the fuel gas type, the installation of the blower, and the exhaust method described above.

In the embodiment shown in FIG. 2, the rectifying member 12 is housed in the first rectifying chamber 10 to which the discharge portion 7a of the blower 7 is connected. As the rectifying member 12, a honeycomb rectifying element formed by forming a large number of hexagonal cylindrical bodies, a lattice-shaped rectifying element formed by forming a large number of square cylindrical bodies, or the like is used.

The air flow blown out from the discharge portion 7a is guided in the vertical direction as it is through a large number of cylindrical bodies of the rectifying element 12 and is directly blown out to the rectifying plate 11 on the downstream side, thereby being generated at the discharge portion 7a of the blower 7. Therefore, it is possible to correct the non-uniformity of the air flow, so that a better rectification effect can be obtained in the second rectification chamber 9 as compared with the embodiment shown in FIG.

[0022]

As described above, according to the first aspect of the present invention, the rectifying mechanism for rectifying the combustion air from the blower has a two-chamber configuration including the first rectifying chamber and the second rectifying chamber. This not only improves the rectification effect, but also greatly simplifies the configuration of the ventilation holes in the rectification plate, and as a result, the fuel gas type, the installation of the blower, the exhaust method, etc. It is possible to provide a gas combustion device that can sufficiently respond.

According to the second aspect of the present invention, the blower and the first rectifying chamber are integrally formed to improve the detachability of the blower. Further, since the non-uniformity of the air flow discharged from the blower can be corrected by the assembly alone, the quality control of the combustibility can be easily performed.

According to the third and fourth aspects of the present invention, a rectifying member having a large number of cylindrical bodies, such as a honeycomb rectifying element or a lattice rectifying element, is housed in the first rectifying chamber. Thereby, the non-uniformity of the air flow blown out from the blower is corrected, and the air is uniformly guided to almost the entire first rectifying plate, so that the rectifying effect in the second rectifying chamber is further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a schematic structure of a gas combustion apparatus to which the present invention is applied.

FIG. 2 is a longitudinal sectional view showing another embodiment of the gas combustion apparatus to which the present invention is applied, which is different from FIG.

FIG. 3 is a longitudinal sectional view showing a conventional gas combustion device.

[Explanation of symbols]

 2 Burner part 3 Nozzle holder 7 Blower 8 Second rectifying plate 9 Second rectifying room 10 First rectifying room 11 First rectifying plate 12 Rectifying member

Claims (4)

[Claims] 1. A burner for burning a mixed gas, a nozzle holder for supplying a fuel gas to the burner, and a second rectifying plate disposed upstream of the burner and rectifying combustion air. A second rectifying chamber, a first rectifying chamber disposed upstream of the second rectifying chamber and provided with a first rectifying plate, and mounted on the first rectifying chamber, and via the first rectifying chamber and the second rectifying chamber. And a blower for supplying combustion air to the burner section. 2. The air conditioner according to claim 1, wherein the blower and the first rectification chamber are integrated, and the first rectification chamber portion is attached to the second rectification chamber. Gas combustion device. 3. The gas combustion apparatus according to claim 1, wherein a rectifying member for equalizing an air flow is housed in the first rectifying chamber. 4. The gas combustion device according to claim 3, wherein the rectifying member is a honeycomb rectifying element or a lattice rectifying element.