JPS589057Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a combustion device equipped with a device for muffling pulsating combustion noise.

Generally, in a combustion machine, when a flame is formed, pressure waves are generated within the combustion chamber due to the heat generated by the flame.

Combustion type When combustion is performed alone or when combustion is performed in the open atmosphere, such as in a bathtub, the pressure waves generated by combustion are absorbed, and combustion noise is simply fluid noise caused by flame turbulence.

However, if the device is sealed and has a long or complicated air supply and exhaust circuit, such as a forced-air combustion device, unnatural ignition or fluctuations in the air/fuel mixture concentration may cause pressure waves in the flame. It has been confirmed that the fluctuations match the acoustic characteristics of a sealed combustion device, promoting expansion and contraction of the flame, causing large pressure fluctuations, and generating pulsating noise of several H2iJ.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above.

An embodiment of this invention will be described below based on the drawings.

In FIG. 1, 1 is a kerosene vaporization combustor (hereinafter referred to as a combustor), 2 is a heat exchanger that exchanges heat with the combustion gas of the combustor 1, and is airtightly connected to the combustor 1. The combustion gas exhaust port 2a is connected to an exhaust duct 3.

4 is a blower, 5a is a first air supply duct that communicates the air inlet of the combustor 1 with the discharge port of the blower 4, 5b is a 20th air supply duct that communicates with the inlet of the blower 4, and 6 is an air supply and exhaust pipe. in,
It is installed through the wall A and consists of an outer cylinder 61 and an inner cylinder 62, which have an air supply port 6a and an exhaust port 6b on the outdoor side, and the air supply port goes to the air supply duct 5b, and the exhaust port 6b connects to the air supply duct 5b. It communicates with the exhaust duct 3 and constitutes an air supply circuit B and an exhaust circuit C of the combustion device.

FIG. 2 is a longitudinal cross-sectional view of the combustor 1, in which 1 is an air inlet, 8 is a combustion plate that forms a flame in a combustion chamber 9 in a closed space, 10 is a nozzle device that injects fuel, and 11 is a combustor 1 This is a heater that preheats the main body.

FIG. 3 is a sectional view of the blower, where 12 is a casing of the blower 4, 13 is an air chamber housing a motor 14, and has an inlet 15 connected to the first air supply duct 5aVC.

16 is a relatively thin and flexible silicone rubber, for example 1. O
This pressure absorbing plate has a hardness of approximately 50 t Shore and is attached to the open end face of the casing 12 so as to close it, and forms one wall face of the air chamber 12.

An end cover 11 has a pressure absorbing plate 16 fixed to the open end surface of the casing 12 to make the air chamber 13 airtight, and has a plurality of opening holes 17a as shown in FIG.

18 is a blade of the blower 4, and 19 is a discharge port of the blower 4.

Next, the operation will be explained.

In order to perform combustion in the combustor 1, combustion air is supplied from the outside from the air supply port 6a of the supply/exhaust pipe 6 through the second air supply duct 5b1, the blower 4, and the tenth air supply duct 5a. .

The fuel is injected from the nozzle device 10 of the fuel supply circuit, vaporized on the heating surface of the main body of the combustor 1 that has been heated in advance by the heater 11, mixed with the air, ignited by a spark plug (not shown), and combusted. Upstream side of plate 8, that is, combustion chamber 9
Forms a flame within.

The combustion gas generated by combustion is transferred from the combustor 1 to the heat exchanger 2.
, the exhaust duct 5, and the exhaust port 6b of the supply/exhaust pipe 6 to the outside.

In addition, since each part of the air supply and exhaust passage is connected airtightly, combustion air and combustion gas will not leak into the room.

Normally, the air chamber 12 is in a negative pressure state, and as shown in FIG. 3, the pressure absorbing plate 16 deforms and air enters between it and the end cover 1T, forming a resonance muffling space. When pulsating combustion is induced, the pressure absorbing plate 16 causes the pressure waves of the pulsating combustion to interfere with the atmosphere through the opening hole 17a of the end cap 1T, so that the pulsating combustion is stopped and the operating noise of the pressure absorbing plate 16 is also reduced. disappear.

The interference effect is determined by the specifications of the pressure absorbing plate 16 and the opening area of the end cap 17 depending on the characteristics of pressure waves of pulsating combustion.

As described above, according to this invention, the opening formed in a part of the air supply circuit is airtightly closed with a lid having a plurality of opening holes via a flexible pressure absorbing plate, so that pulsating combustion If this occurs, the pressure waves of the atmosphere and pulsating combustion will interfere with each other through the opening hole in the lid, preventing pulsating combustion, and at this time, the resonant silencing space formed between the pressure absorbing plate and the lid will cause The operating sound of the pressure absorbing plate can be silenced.

Further, since the pressure absorbing plate is provided in the air supply circuit at a relatively low temperature, there is no need to use a heat-resistant material for high temperatures, and the pressure absorbing plate can be constructed at a low cost.

[Brief explanation of the drawing]

Fig. 1 is a combustion device showing an embodiment of this invention, Fig. 2 is a longitudinal sectional view of the combustor, Fig. 3 is a longitudinal sectional view of the blower, and Figs. 4 and 5 are the main points of this invention. FIG. 3 is a perspective view of a pressure absorbing plate and an end cover. In the figure, 1 is a combustion machine, 2 is a heat exchanger, 3 is an exhaust duct, 4
is a blower, 5at5b is the first and 20th air supply duct,
16 is a pressure absorbing plate, and 17 is an end cover. Note that the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A mixture of combustion air supplied from the air supply circuit and fuel supplied from the fuel supply circuit is combusted, and the combustion gas is discharged through the exhaust circuit, in which a part of the air supply circuit is a flexible pressure absorption plate for closing the formed opening; and a lid having a plurality of opening holes and airtightly attached to the opening of the air supply circuit via the pressure absorption plate, the pressure absorption plate A combustion device characterized in that a resonance silencing space is formed between the lid and the lid.