JPH0384307A - Burner - Google Patents

Abstract

PURPOSE:To prevent the generation of resonant sounds in an extension duct by providing parallel channels which reduce the passage area of the extension duct in its upstream section by means of parallel wall faces. CONSTITUTION:Since in the combustion section 5 air and gas that are sent forcibly by a blower 3 are burned forcibly, a large combustion sound is generated. The combustion sound thus generated lowers its sound pressure a little while it passes a silencer 8, and it is led to an extension duct 4 from the section where the exhaust gas is exhausted in a hot water supplier 1 with gas fuel. the exhaust gas and exhaust sound that are led to the extension duct 4 have the sound pressure reduced as they pass parallel channels 12 of the connection adapter 11 at highest upstream of the extension duct 4. With this arrangement when the internal pressure in the combustion section suddenly increases as at the time of ignition and a combustion sound of large sound pressure is generated, that sound pressure is reduced in parallel channels 12 and no resonant sound is generated in the extension duct 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a combustion device equipped with an extension duct, and particularly relates to a technique for suppressing resonance noise generated in the extension duct.

[Prior Art] There is a combustion apparatus in which the main body of the combustion apparatus is installed indoors or outdoors, such as in a corridor of an apartment complex, and exhaust gas generated in the combustion section is guided to the outdoors or to an isolated area through extension ducts 1 to 1.

[Problem to be solved by the invention] However, if the length of the extension duct is within a predetermined range,
In addition, in a combustion device that has been bent a predetermined number of times, when the force inside the combustion section suddenly increases, such as at the start of combustion, the #sweat-high combustion-11 generated by forced combustion becomes even higher, and the sound bounces inside the extension duct. It had the problem of generating resonance noise.

Note that if the length of the extension duct becomes longer than the specified range or if the number of bends increases, the combustion sound will decrease as it passes through the extension duct, and there will be no sound pressure sufficient to generate resonance, causing resonance. It is thought that the sound will no longer be generated.

The present invention has been made in view of the above circumstances, and its purpose is to provide a combustion device that eliminates the resonance sound of the extension duct.

[Lower stage for solving the problem] In order to achieve the above purpose, a combustion device main body is provided with a blower that forcibly supplies combustion air to the combustion section, and an extended exhaust system is used to exhaust the exhaust gas generated in the combustion section. The combustion device equipped with an extension duct that allows for

A parallel passage is provided in an upstream portion of the extension duct to reduce the passage area of the extension duct by means of parallel walls.

[Operation] A narrow passage with parallel surfaces facing each other has the effect of reducing sound passing through the passage.

Therefore, the high sound pressure combustion sound generated by forced combustion passes through the parallel passage provided in the first flow section of the extension duct, thereby reducing the sound pressure of the combustion sound.

[Effect of the Invention 1] In the present invention, as explained in the second function below, the combustion sound guided to the extension duct passes through the parallel passage, thereby reducing the sound pressure of the combustion sound. For this reason, even if the combustion capacity increases and a loud combustion sound is introduced into the extension duct, the sound pressure introduced into the extension duct downstream of the parallel passage will not reach the level of sound pressure that would generate resonance sound. .

As a result, generation of resonance noise downstream of the parallel passage can be suppressed.

[Embodiment 1] Next, a combustion apparatus of the present invention will be explained based on an embodiment shown in the drawings.

FIG. 1 shows a sectional view of a gas water heater to which the present invention is applied.

[Cass Water Heater] is a combustion device main body of the present invention, and is equipped with a combustion passage 2 inside. The combustion passage 2 has one end connected to the outlet of the blower 3 and the other end connected to the upstream end of the extension duct 4. The combustion passage 2 includes a combustion section 5 that burns gas (fuel).

The combustion section 5 includes a burner 6. In the combustion section 5, gas and air mixed upstream of the blower 3 are forcibly fed, and the burner 6 performs forced combustion of the gas.

Further, inside the combustion passage 2, a heat exchanger 7 is provided which heats the water flowing therein using the heat generated in the combustion section 5. The upstream side of this heat exchanger 7 is connected to a water source, and the downstream side is connected to a cooker operated by the user.

3. A gas passage (not shown) that guides gas to the air flow at the inlet of the blower 3 is provided with a valve device (not shown) that controls gas flow and gas flow. Note that devices necessary for combustion, such as the blower 3, valve equipment, and a sparker (not shown), are controlled by a control device (not shown). When this control device is opened by the user and a water flow is generated in the water channel leading to the heat exchanger 7, the control device operates the blower 3, supplies waste to the flow of the blower 3, and drives the spur force. Burner 6 is ignited. Then, after the Meibi, the amount of gas and the amount of air blown are controlled so that hot water at the temperature desired by the user is obtained from the boiler.

A muffling means 8 is provided in the exhaust gas discharge portion of the gas water heater 1 (inside the combustion passage 2) to reduce combustion noise emitted to the outside. The sound-absorbing means 8 is a sound-absorbing material 9, which is supported in the combustion passage 2 by climbing on a punching metal 10 having a large number of holes.

Next, the extension duct 4 will be explained.

The extension duct 4 is an extension passage for exhaust gas that guides the exhaust gas released from the combustion passage 2 to the outdoors or to an isolated area when the gas water heater 1 is installed indoors or outdoors in a hallway of an apartment complex. . Gas water heater 1 to which extension duct 1-4 is connected
A connection adapter 11 (see FIG. 2) for connecting the extension duct 4 is attached to the exhaust gas discharge portion (outside the combustion passage 2).

This connection adapter 11 is located within the extension duct. The connection adapter 11 has a diameter of 8o and a length of about 7CI11, for example.
It is a cylindrical body with a parallel passageway 12 according to the present invention inside. The parallel passage 12 is a passage formed between the flat plate portions 13 with a depth of about 5 (7) facing each other at a distance of about 4 mm, and whose passage area is smaller than that inside the extension duct 4.
It is formed by a plate material 14 arranged within 1. This plate material 14 has parallel sections (flat plate portions 13) with opposing cross sections.
The plate material 14 is bent into a substantially C-shape, and is placed inside the connection adapter 11 and fixed to the connection adapter 11 by spot welding. In the gap between the connection adapter 11 and the plate material 14, a porous material fI15 such as glass wool, which is a sound absorbing material, is arranged. Note that the shape of the exhaust gas discharge portion of the gas water heater 1 is arranged in c stages in accordance with the shape of the parallel passage 12.

Extension tuffs 1 to 4 having a diameter of 10QTI in accordance with the installation conditions of the gas water heater 1 are connected to the connection adapter 11. The extension duct 4 has a diameter changing part 1 that changes the diameter of 1.0 ON+ to the diameter of 8(1) of the connection adapter 11.
6 is formed.

Next, the operation of the above embodiment will be briefly explained.

When the cooker is opened by the user, the control device detects the generated water flow, and the control device causes the combustion section 5 to start burning the gas.

In the combustion section 5, the air forcibly sent by the blower 3 and the residue are forced to burn, so that a loud combustion noise is generated. The sound pressure of the generated combustion sound decreases a little when it passes through the silencing means 8, and is led to the extension duct 4 from the exhaust gas discharge part of the waste water heater 1.

The exhaust gases and combustion sounds guided into the extension duct 4 pass through the most upstream connection adapter 11 of 4 to the extension duct 1 . That is, 31 Tl passes through the parallel passage 12. Therefore, when the combustion sound passes through the parallel passage 12, the sound pressure decreases.

As a result, even if combustion noise with a large sound pressure is generated in the extension duct 4 and is guided into the extension duct 4 when the internal pressure of the combustion section suddenly increases during ignition, the sound pressure guided into the extension duct 4 It drops in the parallel passage 12 upstream of the duct 4. As a result, the combustion sound having a sound pressure that generates 11β sound within the extension duct 4 is not guided to the extension duct 1-4I/'].

As a result, even if the extension duct 4 has two or more bends C, it is possible to prevent resonance from occurring due to bounce of sound pressure within the extension duct 4.

(Modification) The parallel passage 12 is not limited to the numerical values shown in the above embodiment, but can be changed depending on the usage condition.

Although an example in which the present invention is applied to the waste water heater 1 has been shown, the present invention may be applied to other forced combustion type combustion devices such as a heating device.

Although an example is shown in which gas is used as the fuel, liquid fuel may also be used.

[Brief explanation of drawings]

FIG. 1 is a sectional view schematically showing a gas water heater, and the figure is a perspective view of a connection adapter. In the diagram: 1. Gas water heater (combustion device main body) 3. Blower 4. Extension tough 1st to 2nd 0

Claims (1)

[Scope of Claims] 1) A combustion device comprising a combustion device main body including a blower that forcibly supplies combustion air to a combustion section, and an extension duct for extending and exhausting exhaust gas generated in the combustion section. . A combustion device, characterized in that a parallel passage is provided in an upstream portion of the extension duct, with a parallel wall surface to narrow down the passage area of the extension duct.