JPS6021621Y2 - oil burner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil combustor that vaporizes and burns oil, and aims to reduce noise generated during combustion.

2. Description of the Related Art Conventionally, an oil burner such as an oil fan heater that vaporizes and burns oil has a drive motor 1 arranged so that its rotation axis is vertical, as shown in FIG.

A pump 4 located in the oil 3 in the oil tank 2 is connected to the lower rotating shaft part, and a blower 5 for blowing air for combustion and an oil supply pipe 6 from the pump 4 are connected to the upper rotating shaft part.
A rotating plate 7 is arranged to atomize the petroleum sent through the pump by centrifugal force, thereby configuring the supply device A.

Further, downstream of the supply device A, there is a vaporization chamber 8 configured to keep the wall surface at a high temperature by embedding a heater or the like in the wall surface, and a burner having a slit-shaped flame opening 9 on the side surface and a head chamber 10 inside. The atomized oil sent from the supply device A is vaporized by colliding with the wall surface of the vaporization chamber 8, and is mixed with the combustion air sent from the blower 5 to form an air-fuel mixture. After that, it is configured to burn at the flame port 9 of the burner head 11.

Further, a flat partition plate 12 is provided between the vaporization chamber 8 and the head chamber 10.
One end is opened in the center of this partition plate 12 to serve as an outlet 13, and it is made to protrude toward the vaporization chamber 8 so that the direction in which combustion air from the blower 5 flows is 180 degrees.
A cylindrical pressure equalizing cylinder 15 having an inlet 14 on the lower end peripheral side is arranged so that the inflow is reversed, and an air passage 16 in the pressure equalizing cylinder 15 is arranged.
The vaporization chamber 8 and the head chamber 10 are communicated with each other via.

Note that 17 is a combustion air supply port provided in the supply device A, and the dashed-dotted arrow indicates the flow of the combustion air and the air-fuel mixture.

In the case of the above configuration, the petroleum is atomized by the centrifugal force caused by the rotation of the rotary plate 7 and vaporized in the vaporization chamber 8 and mixed with the combustion air sent from the blower 5 in the vaporization chamber 8. It flows into the head chamber 10 through the air passage 16 and burns outside the slit-shaped flame opening 9.

On the other hand, most of the noise generated during combustion is caused by pulsation in the flame caused by pressure fluctuations caused by turbulence in airflow generated upstream of the flame.

However, in the case of the above configuration, the input 14 of the pressure equalizing cylinder 15
Since the flow of combustion air from the blower 5 is reversed by 180 degrees, large airflow turbulence occurs between the vaporization chamber 8 and the ventilation passage 16, and the pressure equalization cylinder 15 is cylindrical. Therefore, the air-fuel mixture flowing through the air passage 16 flows while swirling along the inner wall of the air passage 16, resulting in a state where the turbulence increases, and the air-fuel mixture flowing into the head chamber 10 also becomes a weak swirling flow. Therefore, depending on the shape of the outlet 13 of the ventilation passage 16 and the inclination between the partition plate 11 and the central axis of the ventilation passage 16, the flow in the head chamber 10 becomes partially biased.

For this reason, there is a drawback that the air-fuel mixture does not flow uniformly throughout the flame port 9 provided in the burner head 11, and the flame becomes uneven.
The pressure fluctuations caused by these disturbances caused the flame to pulsate and generate noise.

In order to reduce the influence of these pressure fluctuations, there is a method of increasing the volume of the head chamber 10 relative to the cross-sectional area of the air passage 16 to minimize the dynamic pressure accompanying the flow in the air passage 16. However, when this method is used, there is a drawback that the burner head 11 becomes large and the combustor becomes large.

In contrast, the present invention attempts to solve the above-mentioned drawbacks by improving the shape of the pressure equalizing cylinder near its outlet.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 2, in this embodiment, the drive motor 21 is arranged so that its rotating shaft is vertical, and a pump 24 located in oil 23 in an oil tank 22 is connected to the lower rotating shaft. There is a blower 2 for blowing air for combustion on the rotating shaft above the waist.
5 and a rotary plate 27 for atomizing petroleum sent from the pump 24 through the oil pipe 26 by centrifugal force, thereby forming a supply device B.

Further, downstream of the supply device B, there is a vaporization chamber 28 configured to keep the wall surface at a high temperature by embedding a heater or the like in the wall surface, and a burner having a slit-shaped flame opening 29 on the side surface and a head chamber 30 inside. The atomized oil sent from the supply device B is vaporized by colliding with the wall surface of the vaporization chamber 28, and mixed with the combustion air sent from the blower 25 to form an air-fuel mixture. After that, it is configured to be burned at a flame port 29.

Further, the vaporization chamber 28 and the head chamber 30 are partitioned by a partition plate 32.

Further, a cylindrical pressure equalizing cylinder 35 has an outlet 33 at the upper end and an inlet 34 at the lower end circumferential side wall, and has a cylindrical air passage 36 inside.
is provided to penetrate the partition plate 32.

In this state, the upper end of the pressure equalizing cylinder 35 projects from the partition plate 32 into the head chamber 30, and the lower end projects into the vaporization chamber 28, thereby communicating the vaporization chamber 28 and the head chamber 30.

On the other hand, the burner head 3 facing the outlet 33 of the pressure equalizing cylinder 35
The inner surface of the upper wall 36 of 1 is formed into a concave shape to form a reflective surface 39, and its lower end is positioned below the outlet 33 to surround the outlet 35 of the pressure equalizing cylinder 35 and to be partitioned from the upper wall 36. A pressure equalizing net 37 made of, for example, a metal net is arranged between the plate 32 and the plate 32.

Further, the inlet 34 of the pressure equalizing cylinder 35 is provided in a direction in which the direction in which the combustion air from the blower 25 flows is reversed by 180 degrees.

Note that 38 is a combustion air supply port provided in the supply device B, and the dashed-dotted arrow indicates the flow of the combustion air and the air-fuel mixture.

With the above configuration, the petroleum is atomized by the centrifugal force caused by the rotation of the rotary plate 27 and vaporized in the vaporization chamber 28, and becomes a mixture with the combustion air sent from the blower 25. flows into the head chamber 30 via the flame outlet 29
Burn outside.

On the other hand, turbulence in the airflow caused by the inlet 34 of the pressure equalizing cylinder 35 being provided at a position where the airflow from the blower 25 is reversed by 1800 degrees, or airflow caused by swirling flow in the ventilation path 36. For turbulence, the outlet 3 of the pressure equalizing cylinder 35
3 protrudes into the head chamber 30, and the inner surface of the upper wall 36 facing the outlet 33 is formed into a concave shape to form a reflective surface 39.
Since the lower end is located below the outlet 33, the air-fuel mixture flowing out from the outlet 33 collides with the reflecting surface 39, thereby changing the dynamic pressure component of the air-fuel mixture to a static pressure component. It turns out.

Therefore, the turbulence of the airflow, that is, the change in the dynamic pressure component in the airflow, is absorbed, and the turbulence in the air-fuel mixture flowing into the flame port 29 can be significantly reduced.
The flow of the air-fuel mixture on the downstream side of the reflecting surface 39 can be made uniform.

Further, surrounding the pressure equalizing cylinder 35, the earth wall 36 and the partition plate 3
By disposing the pressure equalizing net 37 between the reflective surface 39 and
It is possible to suppress the turbulence of the airflow that newly occurs when the air-fuel mixture passes through the lower end, and it is possible to obtain an airflow with even smaller pressure fluctuations.

Therefore, combustion noise due to flame pulsations caused by pressure fluctuations contained in the air-fuel mixture can be extremely effectively prevented, and a uniform flame can be formed.

As described above, according to the present invention, combustion noise is eliminated and a flame is stably formed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional example, and FIG. 2 is a sectional view of an oil combustor according to an embodiment of the present invention. B... Supply device, 25... Blower, 2
7... Rotating plate, 28... Vaporization chamber, 29
... Flame mouth, 30 ... Head chamber, 32.
...Partition plate, 33...Exit, 35...
... Pressure equalization cylinder, 36 ... Ventilation passage, 39 ...
...Reflective surface.

Claims (2)

[Scope of utility model registration request] (1) The pressure equalizing cylinder outlet is made to protrude into the head chamber by penetrating the partition plate that partitions the vaporization chamber and the head chamber, and the inner surface of the clay wall of the burner head facing the pressure equalizing cylinder outlet is shaped into a concave bottom. An oil combustor characterized in that it has a reflecting surface and the lower end of the reflecting surface is located below the outlet of the pressure equalizing cylinder. (2) The oil combustor according to claim (1) of the utility model registration, characterized in that a pressure equalizing net surrounding the outside of the outlet of the pressure equalizing cylinder is provided.