JPH025208Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a burner that is incorporated into a water heater or the like. Specifically, a plurality of main air injection ports for ejecting combustion air are formed in a row on a partition plate that partitions a combustion section and an air supply chamber, and the fuel gas supply is arranged at a position facing the partition plate. A plurality of fuel gas nozzles that eject fuel gas toward the partition plate side are arranged in a row in the pipe, and the phases in the longitudinal direction of the fuel gas supply pipe with respect to the main air nozzles are different from each other. and a fuel gas collision surface is formed in a portion of the partition plate facing each of the fuel gas jet ports, and a sub air jet port is formed on an edge side of each of the fuel gas collision surfaces of the partition plate. Regarding a certain burner.

[Conventional technology]

Such a burner was previously developed by the inventors of the present invention with the aim of reducing noise while maintaining good combustibility. That is, according to the above burner, the fuel gas is made to collide with the fuel gas collision surface, flowed along the fuel gas collision surface, and then swirled by being merged with the air from the main air jet port, In addition, the airflow from the auxiliary air jet port suppresses the diffusion of the swirling flow to stabilize the swirling, and the fuel gas and air are mixed well and combusted with such stable swirling. For example, compared to conventional burners that cause fuel gas and air to collide and perform mixed combustion, the noise generated during combustion can be reduced. The present inventors have adopted a configuration in which the main air outlet and the auxiliary air outlet are provided as the air outlet.

[Problem that the invention attempts to solve]

However, as a result of repeated research experiments and trial and error, we discovered the following.

In other words, as described above, when air is ejected from the main air outlet and the auxiliary air outlet, as shown in FIG.
The main flame is located only in the area surrounded by and the secondary air outlet 14.
A ₁ (shaded area in the drawing) is formed in a state where it is separated from the adjacent main flame a ₁ . However, for example, if the combustion air is improved to be distributed and ejected from the edge of the partition plate of the main air outlet in the longitudinal direction of the fuel gas supply pipe, two adjacent main Not only is a main flame a ₁ formed in the area surrounded by the air outlet 12 and the auxiliary air outlet 14 , but also an auxiliary flame a ₂ is formed between the adjacent auxiliary air outlets 14 . Auxiliary flame A ₃ connecting auxiliary flame A ₂ and the main flame A ₁
is formed, and compared to the previous case, the area of the flame,
In other words, it has been found that the combustion area becomes wider, the load on the bottom surface area is lowered, noise is reduced, and the flame lift becomes difficult, allowing a wide range of excess air ratio values that can maintain good combustion. It is assumed that this is because the contact area between the combustion air and the fuel gas is increased, and the combustion air and the fuel gas are mixed in a state close to a laminar flow rather than a turbulent flow.

The purpose of the present invention is to further reduce noise and improve combustibility based on the above knowledge.

[Means for solving problems]

A characteristic configuration of the burner according to the present invention is that the width of the end portion on the edge side of the partition plate in the longitudinal direction of the fuel gas supply pipe is configured to be larger than the width of other portions of the main air jet port. It is in. The effects and effects thereof are as follows.

[Effect]

By forming a large width in the longitudinal direction of the fuel gas supply pipe at the end of the main air outlet on the edge side of the partition plate, combustion air can be drawn from the end of the main air outlet on the edge side of the partition plate. Since the fuel gas can be ejected in a distributed manner in the longitudinal direction of the fuel gas supply pipe, as described above, the main flame is placed in the area surrounded by the two adjacent main air nozzles and the auxiliary air nozzle, and the main flame is placed between the two adjacent auxiliary air nozzles. An auxiliary flame can be formed between the main flame and the auxiliary flame, and an auxiliary flame can be formed to connect the main flame and the auxiliary flame.

[Effect of idea]

Therefore, the present invention has been able to achieve further reduction in noise and improvement in combustibility through simple structural modifications such as improvement of the main air outlet.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 4, a water heater is constructed by incorporating a heat exchanger 2 for heating water and a burner 3 of the present invention in a casing 1.

The burner 3 includes an upward combustion type burner main body 5 inside a case 4 connected to the lower end of the heat exchanger 2.
A perforated plate 7 for air pressure equalization distribution is provided in the air supply chamber 6 to the burner main body 5, and a cross-flow fan 8 blowing air toward the perforated plate 7 is installed in the air supply chamber 6 to the burner body 5. The axis of rotation is along the longitudinal direction of the burner main body 5, and the case 4
The burner body is disposed and positioned within the width of the burner body in the juxtaposed direction.

As shown in FIGS. 1 and 2, the burner body 5 includes a partition plate 9 made of a heat-resistant metal such as stainless steel and having a substantially U-shaped cross section and partitioning the combustion section A and the air supply chamber 6. A fuel gas supply pipe 10 made of heat-resistant metal such as stainless steel is disposed in the recess of the plate 9.
It consists of

The side plate portions 9A of the partition plate 9 are configured in an inclined posture such that they become farther away from each other toward the edges, and the edges of the side plate portions 9A are provided with plate portions 9B for attachment, respectively.
are installed in succession. That is, the partition plate 9 as a whole has a substantially M-shaped cross section.

The partition plate 9 in the fuel gas supply pipe 10
In the portions facing the both side plate portions 9A, respectively,
A plurality of fuel gas jet ports 11 that jet fuel gas toward the opposing side plate portions 9A are arranged in the longitudinal direction of the fuel gas supply pipe 10 (hereinafter referred to as the pipe longitudinal direction).
They are arranged in rows along the

On both side plate portions 9A of the partition plate 9,
A main air outlet 1 that blows out combustion air from the air supply chamber 6 toward the fuel gas supply pipe 10 side.
2 are arranged in a row along the longitudinal direction of the pipe, and
The burner fuel gas jet ports 11 are arranged in such a way that their phases in the pipe longitudinal direction are different, and fuel gas collision surfaces 13 are formed in portions facing each of the fuel gas jet ports 11, so that the fuel gas collides with each other. Partition plate 9 on each surface 13
A sub air outlet 14 is formed at the edge side portion of the air outlet.

To explain further, the fuel gas nozzle 11 and the auxiliary air nozzle 14 are circular holes, and the main air nozzle 12 is a circular hole.
is basically a long slit along the inclination direction of the side plate portion 9A, and specifically, the width in the longitudinal direction of the pipe at the end on the edge side of the partition plate is the same as that of the other portions. It is constructed in the shape of a keyhole that is larger than its width. Further, the fuel gas jetting port 11 is disposed within the air jetting path B from the main air jetting port 12 when viewed in the longitudinal direction of the pipe. In other words, main air outlet 1
A part of the combustion air from 2 is transferred to the fuel gas supply pipe 1
The fuel gas supply pipe 10 is cooled by directly spraying the fuel gas onto a portion of the fuel gas supply pipe 10 that is located closer to the bottom of the recess than the fuel gas injection port 11 .

The burner 3 causes the fuel gas from the fuel gas jet port 11 to collide with the fuel gas collision surface 13,
After flowing along the fuel gas collision surface 13, the fuel gas and the combustion air are swirled by being merged with the combustion air from the main air jet port 12, and the fuel gas and the combustion air are flowed from the auxiliary air jet port 14. The combustion air is configured to suppress the diffusion of the swirling flow and to mix the combustion air with the swirling flow to mix the fuel gas and the combustion air to perform combustion.

To explain the combustion state, the main air jet port 12
As shown in FIG. A main flame a ₁ is formed in the area surrounded by the main flame a 1 and the auxiliary air outlet 14, and an auxiliary flame a ₂ is formed between two adjacent auxiliary air outlets 14, and the main flame a ₁ and An auxiliary flame a ₃ is formed to connect the auxiliary flame a ₂ ,
The combustion surface becomes wider.

In the burner 3, a portion of the air supply chamber 6 between the partition plate 9 and the perforated plate 7 is divided into a portion of the partition plate 9 that corresponds to one side plate portion 9A and a portion of the partition plate 9 that corresponds to the other side plate portion 9A. A partition portion 16 is formed to divide the space into two parts.

Furthermore, in the burner 3, the partition plate 9 and the fuel gas supply pipe 10 are separated from each other when viewed in the longitudinal direction of the pipe.
a closing part 1 that closes the gap between the main air outlet 12 and the fuel gas outlet 11 near the bottom of the recess;
7 is formed. That is, in the burner 3, the gap between the partition plate 9 and the fuel gas supply pipe 10 is
It is located closer to the bottom of the recess than the main air nozzle 12 and the fuel gas nozzle 11, and the fuel gas is supplied by reducing the area where the fuel gas enters due to negative pressure caused by the jetting out of the fuel gas and combustion air. tube 1
0 and the partition plate 9 from overheating.

The partition portion 16 is formed by bringing the perforated plate 7 into close contact with the bottom side of the concave portion of the partition plate 9, that is, the bottom plate portion 9C connecting the side plate portions 9A, and the closing portion 17 The bottom plate portion 9C is shaped to follow the circumferential surface of the fuel gas supply pipe 10.
It is formed by bringing the fuel gas supply pipe 10 into close contact with the entire C.

Next, examples of actual dimensions of each part are shown.

The length L ₁ between both edges of the partition plate 9 is 31 mm,
The angle α ₁ formed by the side plate portions 9A of the partition plate 9 is
60°, the outer radius of the fuel gas supply pipe 10 and the inner radius R of the bottom plate portion 9C of the partition plate 9 are 7.5 mm,
The diameter d ₁ of the fuel gas nozzle 11 is 1.2 mm, and the width d ₂ of the edge of the partition plate of the main air nozzle 12 and the width l ₁ and length l ₂ of the other parts are 3 mm and 2 mm, respectively.
mm and 8 mm, and the diameter d ₃ of the auxiliary air outlet 14 is 1.7
mm, the bottom edge of the recess of the main air outlet 12 and the partition plate 9
The distance L ₂ from the edge of the fuel gas outlet 11 is 10 mm.
The inclination angle α ₂ of the plane including the pipe axis and the perforated plate 7 is 12°, and the pitch P of each of the fuel gas nozzle 11, the main air nozzle 12, and the auxiliary air nozzle 14 is 7.
mm.

[Another example]

Next, another embodiment of the present invention will be shown.

As shown in FIG. 5, the main air outlet 12
is formed into a teardrop shape in which the width of the end portion on the edge side of the partition plate in the longitudinal direction of the pipe is larger than the width of the other portion.

Although the above-mentioned embodiment shows an upward combustion type burner, it goes without saying that the present invention can be applied to horizontal combustion type and downward combustion type burners.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the burner according to the present invention, and FIG. 1 is a partially cutaway plan view of the main part;
Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view of the main parts showing the combustion state, Fig. 4 is a vertical sectional side view of the water heater, and Fig. 5 shows another embodiment. FIG. 3 is a partially cutaway plan view of the main part. FIG. 6 is a plan view of the main parts showing the combustion state of the comparative example. A... Combustion part, 6... Air supply chamber, 9... Partition plate, 9A... Side plate part, 10... Fuel gas supply pipe,
11...Fuel gas outlet, 12...Main air outlet, 13...Fuel gas collision surface, 14...Sub air outlet.

Claims (1)

[Scope of utility model registration request] Partition plate 9 that partitions combustion section A and air supply chamber 6
, a plurality of main air jet ports 1 for jetting out combustion air;
2 are arranged in a row, and a fuel gas supply pipe 10 is provided at a position facing the partition plate 9, and a plurality of fuel gas injection ports 11 are provided for ejecting fuel gas toward the partition plate 9 side. are formed in a row and arranged so that the phases in the longitudinal direction of the fuel gas supply pipe 10 with respect to the main air jet port 12 are different, and
A fuel gas collision surface 13 is formed in a portion of the partition plate 9 that faces each of the fuel gas jet ports 11, and a sub air jet port 14 is formed on the edge side of each of these fuel gas collision surfaces 13 in the partition plate 9. The burner is configured such that the width in the longitudinal direction of the fuel gas supply pipe 10 at the end on the edge side of the partition plate 9 in the main air outlet 12 is configured to be larger than the width of other parts. A burner.