JPH0325008Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application] The present invention relates to a forced air gas combustion device, and by providing a small hole on the combustion chamber side,
This reliably prevents the so-called kettle rattling phenomenon (a phenomenon in which the combustion sound resonates).

[Prior art and its problems]

In forced air gas combustion equipment, there is airtight communication between the combustion chamber and the exit of the exhaust stack.
In some cases, the acoustic characteristics from the combustion chamber to its downstream side produce a low frequency resonant sound that is matched by the oscillating pressure waves generated as a result of combustion.

A method to alleviate this inconvenience has already been introduced in 1983.
−19316, which includes:
As shown in Fig. 8, burner box 1 connected to combustion chamber 1
0, the discharge port 31 of the fan 3 is opened, and the secondary air passage from this discharge port to the gas burner 2 is
A first pressure equalizing plate 11 and a second pressure equalizing plate 12 each having a large number of holes are divided into two stages, and a small transparent hole is formed in the side wall of the burner box body 10 between the first and second pressure equalizing plates 11 and 12. Holes 13, 13 are opened.

In this conventional type, pressure waves generated by combustion within the combustion chamber 1 are transmitted to the outside of the burner box 10 through the numerous holes in the first pressure equalizing plate 11 and further through the through holes 13, 13. As a result, the generation of resonance noise due to combustion can be prevented.

However, with this conventional method, the effect of preventing resonance noise is still not sufficient, and depending on the length of the exhaust flue connected to the combustion chamber 1 or the exhaust resistance of the exhaust stack, the noise caused by the resonance phenomenon described above may be reduced. may occur.

This is because pressure waves generated during combustion within the combustion chamber 1 are difficult to escape. That is,
The pressure wave is transmitted through the first pressure equalizing plate 11 to the through hole 1.
3 and 13 to the atmosphere, the resistance of the first pressure equalizing plate 11 suppresses the pressure waves from escaping.

[Technical Issues] The present invention consists of: A burner 2 is disposed in a sealed combustion chamber with an exhaust stack communicating with it, and a fan 3 is used to forcibly supply combustion air to the entire area of the combustion chamber 1 where the burner is disposed. In order to more reliably prevent combustion resonance noise in forced-air gas combustion equipment,
The technical challenge is to allow the combustion pressure waves generated in the combustion chamber to escape intact.

[Means]

The technical means of the present invention taken to solve the above technical problem is as follows: A combustion air bypass passage 14 is provided outside the burner installation part, and a small Through hole 13
This means that it was formed.

[Effect]

The above technical means works as follows.

When the burner 2 is in a combustion state, the combustion air supplied by the fan 3 reaches the entire area where the burner is disposed, and the burner 2 continues to burn. At this time, combustion air is simultaneously supplied to the combustion chamber 1 from the bypass passage 14 parallel to the main passage of the combustion air supply passage. In this combustion state, pressure waves generated in the combustion chamber diffuse to the outside through holes 13 formed in the outer wall of the bypass passage 14 that directly communicates with the combustion chamber. That is, the pressure waves generated within the combustion chamber 1 will directly diffuse to the outside of the combustion chamber 1.

In addition, a part of the combustion air passing through the bypass passage 14 escapes from the through hole 13, but this air is not air on the combustion chamber side but air on the primary side, and its temperature is low. .

〔effect〕

Since the present invention has the above configuration, it has the following unique effects.

The pressure waves generated in the combustion chamber are transmitted through the through hole 1 formed in the outer wall of the bypass passage 14 that directly communicates with the combustion chamber.
3 to the outside. That is, combustion chamber 1
Since the pressure waves generated within the combustion chamber 1 are directly diffused to the outside of the combustion chamber 1, the effect of preventing resonance combustion noise is improved compared to the conventional combustion chamber.

Furthermore, since the air leaking from the through hole 13 to the outside of the combustion chamber is at a low temperature, adverse thermal effects on other parts of the appliance can be prevented.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 7.

In the first embodiment shown in FIG. 1, the present invention is applied to a water heater, and the can body of the heat exchanger becomes the combustion chamber 1 as it is. Burners 2, 2 are burner box bodies 10
It is integrally attached to a partition plate 41 fixed to the open end of the partition plate 41, and the peripheral edge of this partition plate 41 forms a downwardly bent hanging piece 42 as shown in FIG.
A protruding tongue piece 43 is provided at the lower end of this hanging piece 42 over the entire area, and the partition plate 41 is fixed to the side wall of the burner box body 10 by this protruding tongue piece 43. The gap between the above-mentioned hanging piece 42 and the side wall of the combustion chamber 1 becomes the described bypass passage 14, and for this purpose, a large number of passage holes 44, 44 are provided in the middle of the above-mentioned hanging piece 42. A part of the combustion air passes through these passage holes 44, 44, and is sent into the combustion chamber 1 from the bypass passage 14.

Note that the through hole 13 opens below the passage hole 44 (on the upstream side of the flow of combustion air), and in this embodiment, a plurality of through holes 13, 13 are provided.

Next, in the second embodiment shown in FIGS. 3 and 4, the partition plate 41 is made into a flat plate, and its peripheral edge is fixed in contact with the open end peripheral edge of the burner box body 10.
A large number of passage holes 44, 44 are provided near the periphery of the passage hole, and a partition wall 45 is erected from the partition plate 41 on the inner periphery of these passage holes. In this case, a plurality of through holes 13, 13 are provided in the side wall of the combustion chamber 1 connected to the burner box 10 at positions facing the partition wall 45.

In the case of this embodiment, the partition wall 45 and the combustion chamber 1
The bypass passage 14 is formed between the side wall of
44 is opened, the flow of air within this bypass passage 14 is natural, and the combustion chamber 1
along the inner wall of the

Incidentally, in the above description, even if the bypass passage 14 is provided in a part of the side edge of the partition plate 41, the above-mentioned operation and effect will not change. For example, the partition plate 41
The bypass passage 14 may be provided only on one side edge, as shown in FIGS. 5 to 7.
The bypass passage 14 may be provided only at two locations on the opposing side edges.

In this latter case, the partition plate 41 is shown in FIG.
The shape is as shown in Figure 7, with burner mounting holes 4 on the top surface.
6, 46 and through holes 47, 47 for secondary air are provided alternately, and furthermore, through holes 4 are provided in a pair of hanging pieces 42, 42 bent from both sides of the long side of the upper surface.
4 and 44 are opened in a staggered manner. or,
These many through holes 44, 44 are the through holes 4 on the top surface.
7 and 47.

Attach the burners 2, 2 to the partition plate 41,
These burners are made into a unit with the partition plate 41 by the pressure equalizing plate 5 having through holes 51, 51, and at the open end of the cavity 32 communicating with the discharge hole 31 of the fan 3,
Projecting tongue pieces 4 connected to the lower ends of the hanging pieces 42, 42
When the can bodies of the heat exchanger constituting the combustion chamber 1 are connected with the heat exchangers 3 and 43 in contact with each other, the combustion chamber 1 is constructed as shown in FIG. In this embodiment, the open side portions at both ends of the partition plate 41 are closed by the side walls of the can body, and the above-described bypass passage 14 is formed between the hanging piece 42 and the inner wall of the can body.

In this embodiment, the through holes 13, 13 are provided in the can body, and these through holes 13, 13 are connected to the through hole 4.
4 and 44, they face the position indicated by the two-dot chain line in FIG. Alternatively, the bypass passage 14 may be formed outside the can body.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the main part thereof, Fig. 3 is an explanatory diagram of the second embodiment,
Fig. 4 is an explanatory diagram of the main parts, Fig. 5 is an explanatory diagram of the third embodiment, Fig. 6 is a plan view of the partition plate 41 used in this, Fig. 7 is a side view thereof, and Fig. 8 is a conventional It is an explanatory diagram of an example, and in the diagram, 1... combustion chamber, 10... burner box body, 13...
Through hole, 14...bypass passage, 2, 2...burner, 21...flame hole, 3...fan, 31...discharge port, 41...dividing plate.

Claims (1)

[Scope of claim for utility model registration] Two burners are installed in a sealed combustion chamber that communicates with the exhaust stack.
In a forced air gas combustion apparatus, combustion air is forcibly supplied to the entire area of the burner installation part of the combustion chamber 1 by a fan 3. This is a forced air gas combustion device in which an air bypass passage 14 is provided and a small through hole 13 communicating with the outside of the combustion chamber is formed in the outer wall of the bypass passage. The bypass passage 14 is connected to the flame holes 21, 2 of the burner 2.
1. A forced-air gas combustion device according to claim 1 of the utility model registration claim, which is provided below 1. Passing hole 4 for air inflow into bypass passage 14
4, 44, the forced air type gas combustion device according to claim 1, wherein the through hole 13 is disposed below the point 4, 44.