JP2005221098A - Combustion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion apparatus, preventing pulsating combustion and abnormal sound caused by reverse flow of combustion gas in an air supply passage due to a pressure rise caused by instantaneous ignition in simple constitution. <P>SOLUTION: This combustion apparatus includes: an instantaneously igniting burner 1 such as an oil gassify burner or a gun type burner; a combustion fan 3 for supplying combustion air to the burner 1 from the outdoors through an air supply passage 16; and a pressure damping means 17 provided in the midway of the air supply passage 16 to damp the reverse flow pressure of combustion gas in the apparatus where the combustion gas of the burner 1 is at least forcibly discharged to the outdoors. Although an increase in pressure occurring when the burner 1 is ignited causes reverse flow of combustion gas in the air supply passage through the combustion fan 3, the air supply passage 16 is provided with the pressure damping means 17, whereby when the combustion gas is circulated through the pressure damping means 17, the pressure is damped and suction force of the combustion fan 3 is added so that the pressure increase is instantaneously suppressed to surely prevent abnormal sound in ignition and pulsating combustion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a combustion apparatus such as a hot 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 this type, the combustion gas passage of the burner and the intake side of the combustion fan are connected by a bypass passage, and a valve device that is opened at the time of ignition is provided in the bypass passage. The instantaneous pressure increase that occurred was alleviated by maintaining the same pressure state, and abnormal noise and pulsation combustion at the time of ignition caused by this pressure increase were prevented. (For example, refer to Patent Document 1.)
Japanese Utility Model Publication No. 62-29800

  By the way, this conventional device has a problem that a large space is required for the installation of the bypass passage, and the entire apparatus becomes large, and the valve device and the control for moving the valve device only for ignition are also provided. It is necessary, and during normal combustion, combustion gas must be prevented from leaking to the intake side, and a sealing means that is highly sealed and resistant to high temperatures is required, which is expensive in terms of structure and control, and increases costs. It had the problem of becoming.

  The present invention pays attention to this point and solves the above-mentioned problems. In particular, in the present invention, in claim 1, a burner that ignites instantaneously, such as an oil gasification burner or a gun type burner, and the burner A combustion fan that supplies combustion air from outside to the burner via an air supply path, and combustion gas of the burner that is at least forcibly exhausted to the outdoors; Pressure attenuating means for attenuating the backflow pressure of the combustion gas is provided.

  According to a second aspect of the present invention, the pressure attenuating means is provided in an air supply pipe in the vicinity of the combustion fan. After the counterflowing combustion gas is brought to the center of the pipe, it is once spread to the pipe wall surface and then brought to the pipe center again. It consists of three baffle plates.

  According to the present invention, an increase in the pressure generated when the burner is ignited appears in a form in which the combustion gas flows back through the combustion fan through the supply air path, and the supply air path is provided with pressure damping means. The combustion gas flows through this pressure attenuating means, and the pressure is attenuated and there is a suction force of the combustion fan, so that the pressure rise is suppressed instantaneously. The abnormal noise and pulsation combustion can be surely prevented, the space can be saved and the instrument can be made compact, special control and parts are unnecessary, the cost is low, and there is no concern about the cost increase.

  Further, the pressure attenuating means is provided in an air supply pipe near the combustion fan. After the combustion gas flowing backward is brought to the center of the pipe, it is once spread to the pipe wall surface, and then brought to the pipe center again. By being composed of a plate, the pressure can be surely attenuated with a simple structure, and it can be quickly returned to normal combustion, so that it can always be used with peace of mind.

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.

  Reference numeral 11 denotes an exhaust pipe for exhausting the combustion gas having flowed through the heat exchanger 10 and connected to an exhaust part 14 of an air supply / exhaust cylinder 13 having a double cylinder structure with a leading end air supply / exhaust hole 12 protruding outdoors. The exhaust gas after the heat exchange is exhausted to the outside, and an air supply pipe 16 constituting an air supply path communicating with the combustion fan 3 is connected to the air supply unit 15 so that outdoor air is used as combustion air. This is supplied to the burner 1.

  Reference numeral 17 denotes a pressure attenuating means provided in the air supply pipe 16 in the vicinity of the combustion fan 3. The first baffle plate 18 is hollowed out at the center and fixed to the inner wall of the air supply pipe 16, and the outer periphery is cut out leaving the center. The second baffle plate 19 and the third baffle plate 20, which is formed in a donut shape in the center like the first baffle plate 18 and is fixed to the inner wall of the air supply pipe 16. In this case, since the flow velocity is low, the resistance is not so much and the gas can flow smoothly, but the resistance is caused by the explosive reverse flow of the combustion gas due to the pressure increase at the time of ignition, that is, the first baffle 18 supplies the air. Combustion gas guided to the center of the pipe 16 is guided to the outer periphery while coming into contact with the next second baffle plate 19 and finally collected to the center with the third baffle plate 20 to repeat concentration and diffusion. Pressure rise and specific While attenuating noise wavenumber 15～25Hz, thereby preventing the occurrence of combustion pulsation induced in the explosive combustion at the time of ignition (oscillatory combustion).

  Further, the pressure attenuating means 17 has a diameter of 26 to 30 mm in the diameter of the first baffle plate 18 and the third baffle plate 20 in the air supply pipe 16 having a diameter of 40 mm, and the central remaining diameter of the second baffle plate 19 is set. The size of the first baffle plate 18 and the third baffle plate 20 is smaller than the hollow diameter of the first baffle plate 18 and the distances L1 and L2 between the baffle plates 18, 19 and 20 are 5 to 9 mm. The clearance dimension is set so that it does not become resistance against the combustion air flowing under pressure but resistance against the combustion gas that rapidly flows backward at positive pressure.

Next, the operation of the embodiment of the present invention will be described.
If an operation switch (not shown) is pressed now, the heater 2 is energized to start the preheating of the burner 1 and reaches the vaporizable temperature of the fuel oil. Is supplied and fuel oil is sprayed from the spray nozzle 5 to form a premixed gas in the burner 1 and ignite with an igniter as appropriate. The heat collector 9 and the heat exchanger 10 do not flow to the exhaust side where there is much resistance, but flow to the air supply side via the burner 1.

  The pressure increase flowing to the air supply side flows back through the air supply pipe 16 via the combustion fan 3 and reaches the pressure attenuating means 17, and the air is supplied by the first baffle 18 in the pressure attenuating means 17. Combustion gas guided to the center of the pipe 16 is guided to the outer periphery while coming into contact with the next second baffle plate 19 and finally collected to the center with the third baffle plate 20 to repeat concentration and diffusion. In addition to attenuating pressure rise and abnormal noise with a specific frequency of 15 to 25 Hz, it also prevents the occurrence of pulsation combustion induced by explosive combustion at the time of ignition. The supply of combustion air is continued, and 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.

  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.

The schematic block diagram of the combustion apparatus which attached | subjected this invention one Embodiment. Explanatory drawing of the principal part.

Explanation of symbols

1 Burner 3 Combustion fan 16 Supply pipe (supply path)
17 Pressure damping means 18 First baffle plate 19 Second baffle plate 20 Third baffle plate

Claims (2)

  A burner that ignites instantaneously, such as an oil gasification burner or a gun type burner, a combustion fan that supplies combustion air to the burner from outside via an air supply path, and combustion of the burner A combustion apparatus comprising a pressure attenuating means for attenuating a backflow pressure of combustion gas in the middle of the air supply path, at least forcibly exhausting the gas to the outdoors.   The pressure attenuating means is provided in an air supply pipe in the vicinity of the combustion fan. After the combustion gas flowing backward is brought to the center of the pipe, it is once spread to the pipe wall surface side and then brought to the pipe center again. 2. The combustion apparatus according to claim 1, wherein the combustion apparatus is constituted by a plate.

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