JP2006194529A - Combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device capable of easily preventing generation of abnormal sound and pulsating combustion due to pressure rise at the time of ignition with a simple structure and at a low cost. <P>SOLUTION: This device is equipped with: an instantaneously ignited burner such as a petroleum gasification burner and a gun type burner; a combustion fan supplying combustion air to the burner; and an entrance 18 and an exit 20 of an orifice part 17, narrowing the air supply passage 4, in the middle of an air supply passage 4 connecting the burner to the combustion fan, wherein the combustion gas of the burner is at least forcibly exhausted to the outside. An opening 22 is formed in the orifice part 17; a resonance box 23 is formed in communication with the opening 22; and the area of the opening 22 is set larger than those of the entrance 18 and the exit 20 of the orifice 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water heater or an FF hot air heater having a burner that instantly ignites, such as a gas burner, an oil gasification burner, or a gun type burner.

Conventionally, in the case of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 2003-262331, the applicant of the present application filed a combustion fan in the middle of a blowing path connecting a burner and a combustion fan. By providing an air chamber consisting of an air chamber in which the inlet communicating with the burner and the outlet communicating with the burner are not arranged in a straight line, the instantaneous pressure rise generated in the burner at the time of ignition is alleviated. This was to prevent abnormal noise and pulsation combustion during ignition caused by pressure increase. (For example, see Patent Document 1)
JP 2003-262331 A

  However, this conventional device cannot completely prevent abnormal noises at low frequency ignition of 20 to 30 Hz and noise due to pulsation combustion. In particular, when pulsation combustion is continuously generated, not only noise but also soot is generated in the burner, and odor is generated.

  This invention pays attention to this point, and in order to solve the above-mentioned drawbacks, a burner that instantly ignites, such as an oil gasification burner or a gun type burner, and a combustion fan that supplies combustion air to the burner And the combustion gas of the burner is at least forcibly exhausted to the outdoors, and an orifice portion that narrows the air blowing path is provided in the middle of the air blowing path connecting the burner and the combustion fan, An opening is provided in the orifice, and a resonance box is provided in communication with the opening.

  The area of the opening is larger than the area of the inlet and outlet of the orifice.

According to the present invention, the increase in pressure generated when the burner is ignited is absorbed by the resonance box from the opening after the flow of air is throttled by the orifice, and this hinders the supply of the next combustion air. Combustion is continued as it is, and it is possible to reliably prevent abnormal noise and pulsation combustion at the time of ignition with an extremely simple configuration in which an orifice part and a resonance box are provided in the middle of the blowing path. No special controls or parts are required, it is inexpensive, and there is no worry of cost increase.
Moreover, by making the area of the opening larger than the area of the orifice, it is possible to further prevent abnormal noise and pulsation combustion during ignition.

  Next, an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes an oil gasification type burner in which a heating heater 2 is cast, which is pumped from combustion air supplied from a combustion fan 3 through a blower passage 4 and an electromagnetic pump (not shown). The fuel oil sprayed from the spray nozzle 5 is premixed and burned by the burner head unit 6 and is instantly ignited by ignition of an igniter (not shown) because it is a gasification system. It is.
Reference numeral 7 denotes a burner support that supports the burner 1 in a suspended manner.

  A combustion cylinder 8 is provided with the above-described burner 1 on the lower side, and a heat exchanger 10 composed of a plurality of pipes is provided at the upper part via a heat collecting part 9, and a cross flow provided at the uppermost part. -Indoor air blown by a hot air fan (not shown) composed of a fan and combustion gas are heat-exchanged and supplied to the room as hot air to perform hot air heating.

  11 is an exhaust pipe that exhausts the combustion gas that has flowed through the heat exchanger 10 and has a temperature drop, and is connected to the exhaust section 14 of the supply / exhaust cylinder 13 that has a double-pipe structure with a front-end supply / exhaust hole section 12 protruding outdoors. The combustion gas after heat exchange is exhausted to the outside, and an air supply pipe 16 communicating with the combustion fan 3 is connected to the air supply unit 15 to supply outdoor air to the burner 1 as combustion air. It is what I did.

  Reference numeral 17 denotes an orifice portion provided at a substantially intermediate position of the blower passage 4 connecting the burner 1 and the combustion fan 3, which is formed of a T-shaped casting tube as shown in FIG. The inlet 18 is connected to the blower fan 3 by a rubber connecting pipe 19 having an inner diameter of about 23 mm, and the inner diameter of the inlet 18 is narrowed to about 18 mm (φx).

  Reference numeral 20 denotes an outlet for blowing air toward the burner 1, which is formed to have an inner diameter of about 18 mm (φY) which is the same as the inner diameter of the inlet 18, and is connected to the burner 1 and the connecting pipe 19 by a rubber connecting pipe 21 having an inner diameter of about 23 mm. Has been. An opening 22 having an inner diameter of about 24 mm (φR) is formed between the inlet 18 and the outlet 20 on a side surface perpendicular to the air blowing direction. The opening 22 communicates with the inner volume and has an internal volume of 1080 cubic centimeters (V). By forming the box 23, pulsation combustion at the time of ignition can be prevented and low frequency noise of 20 to 30 Hz can be prevented. The distance between the opening 22 and the resonance box 23 is connected by a tube 24 of about 40 mm to form a resonance device using the Helmholtz principle. Therefore, in order to improve the performance of the Helmholtz resonance device, the size of φR with respect to φX and φY can be set and adjusted according to the noise frequency specific to the model, so that it can be applied to noise countermeasures of other models.

Next, the operation of the embodiment of the present invention will be described.
If an operation switch (not shown) is pressed now, the heating heater 2 is energized to start the preheating of the burner 1 and the combustion oil reaches the vaporizable temperature. When fuel is sprayed from the spray nozzle 5 and premixed in the burner 1 and appropriately ignited by an igniter, the ignition is instantaneously performed. 9 and the heat exchanger 10 do not flow to the exhaust side where there is much resistance, but flows to the air supply side via the burner 1.

  The pressure increase that flows to the air supply side flows in from the outlet 20 of the orifice portion 17, but the area φY of the outlet 20 is formed to be smaller than the area of the connection pipe 21, but the static pressure increases, but the opening Since the area φR of the portion 22 is larger than the areas φX and φY of the inlet 18 and the outlet 20, the pressure escapes in the direction of the resonance box 23 and is attenuated in the resonance box 23 to prevent pulsation combustion. The burner 1 is also continued from ignition to normal combustion.

  Next, the combustion gas generated by the combustion of the burner 1 circulates through the combustion cylinder 8, the heat collecting unit 9, and the heat exchanger 10, and exchanges heat with the air from the convection fan to produce hot air. The combustion gas whose temperature has dropped as a result of heat exchange is exhausted to the outside through the supply / exhaust tube 13.

Therefore, by providing the orifice portion 17 and the resonance box 23, it is possible to reliably absorb the pressure increase at the time of ignition while having an extremely simple configuration, and to prevent abnormal noise and pulsation combustion, and at a low cost. There is no worry about.
Further, by making the area of the opening 22 larger than the area of the orifice portion 17, it is possible to further prevent abnormal noise and pulsation combustion at the time of ignition based on the Helmholtz principle.
Further, by adjusting the combination of the shape of the orifice portion 17 and the volume of the resonance box 23, various kinds of noise can be reduced.

  In this embodiment, the oil gasification burner has been described as an example. However, the present invention is not limited to this. For example, a gun-type burner can obtain the same effect.

1 is a schematic configuration diagram of a combustion apparatus with an embodiment of the present invention. The schematic block diagram of the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Burner 3 Blower fan 17 Orifice part 18 Inlet 20 Outlet 22 Opening part 23 Resonance box

Claims (2)

  A burner that instantly ignites, such as an oil gasification burner or a gun type burner, a combustion fan that supplies combustion air to the burner, and the combustion gas of the burner is at least forced to the outdoors In the exhausted part, an orifice part that narrows the air passage is provided in the middle of the air passage that connects the burner and the combustion fan. An opening is provided in the orifice part, and communicates with the opening. Combustion device characterized by having a resonance box.   2. The combustion apparatus according to claim 1, wherein the area of the opening is larger than the areas of the inlet and outlet of the orifice.

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