JPH07103967B2 - Oil burning equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a petroleum-fueled vaporization type combustion apparatus, and relates to one that controls a primary air ratio.

2. Description of the Related Art FIG. 3 shows a petroleum combustion device conceived prior to the present invention. 1 is a combustion fan, 2 is a motor, 3 is a rotor, 4 is a carburetor, 5 is a heat insulating material, 6 is a heater, 7 is an oil supply pipe, 8 is an oil supply pump, 9 is a shake plate, 10 is a mixing chamber, 11 is A flame port, 12 is a secondary air chamber, and 13 is a secondary air port. When the heater 1 is energized and the carburetor 4 insulated by the heat insulating material 5 rises to a predetermined temperature, the motor 2 is driven and the rotor 3 and the shake-off plate 9 are driven.
Rotates. On the other hand, the petroleum fuel is pumped up by the refueling pump 8 and discharged onto the rotor 3 through the refueling pipe 7, and is uniformly atomized by the centrifugal force of the shake plate 9. The atomized fuel is vaporized by the heated vaporizer 4, is guided to the mixing chamber 10 together with the primary air supplied by the combustion fan 1, becomes a mixer, and burns at the flame port 11. In addition, the air other than the primary air supplied by the combustion fan 1 is in the secondary air chamber.
It is guided to 12 and spouts from the secondary air port to promote complete combustion.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In recent petroleum combustion apparatuses, particularly in water heaters and heaters, it has been desired to use the fuel by narrowing it down as necessary. However, in the conventional oil combustion device, it was not possible to obtain a large fuel throttle ratio. The reason for this will be described with reference to FIG. When a large throttle ratio (hereinafter referred to as TDR) is taken, the amount of air supplied from the fan 1 must be set to be much larger than the amount of air required for combustion in order to maintain wind resistance. For example, when TDR = 1/1, the excess air ratio m = 1.6, but when TDR = 1/6, m = 4.0.
At this time, the primary air ratio PA becomes the second
As shown in the figure, it changed in the same way as m and exceeded 100% and the flame vent 11 became red hot and the flame lifted and combustion could not be maintained.

Means for Solving the Problems In order to solve the above problems, an oil combustion apparatus according to the present invention includes an inverted conical rotor that atomizes oil by rotation, and a carburetor arranged so as to surround the outer circumference of the rotor. A motor for rotating the rotor, an oil supply pipe for supplying fuel to the rotor, a combustion fan provided upstream of the vaporizer, and a mixing chamber provided downstream of the vaporizer for mixing vaporized gas and primary air. A flame port connected to the chamber, a secondary air chamber provided on the outer periphery of the mixing chamber, and a flame port alternately arranged side by side, and a secondary air port connected to the secondary air chamber, and a bypass provided downstream of the secondary air chamber. An air chamber, a bypass port that connects the secondary air chamber and the bypass air chamber, a bypass valve that controls the amount of air in the bypass port, and a flame plate that is arranged to guide the air flowing out from the bypass air chamber to the downstream side. And consists of a combustion chamber and a heat exchanger There is.

The fuel is supplied from the oil supply pipe to the rotor that is rotated by the motor, and the fuel that moves upward on the rotor surface is atomized by the rotor and blown to the vaporizer to be vaporized gas, which is guided to the mixing chamber. On the other hand, part of the air sent by the combustion fan is introduced into the mixing chamber as primary air and mixed with the vaporized gas. In addition, the remaining air becomes secondary air and is guided to the secondary air chamber. After that, when the maximum combustion amount is reached, the bypass valve closes and all secondary air is ejected from the secondary air port.When the combustion amount is reduced and the throttle ratio (TDR) is increased, the bypass valve is gradually opened. , Part of the secondary air becomes bypass air, is guided from the bypass port to the bypass air chamber, and is ejected toward the flame plate. At this time, only the amount of bypass air,
The amount of primary air and secondary air will be reduced. The jetted mixed gas and secondary air form a flame in the combustion chamber, and the bypass air flows out along the combustion chamber and then becomes combustion gas to be heat-exchanged in the heat exchanger.

Embodiment An embodiment of the water heater according to the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, the same members as those in FIG. 3 are designated by the same reference numerals. Further, 14 is a bypass air chamber, 15 is a bypass valve, 16 is a bypass basic port, 17 is a bypass port, 18 is a flame plate, 19 is a combustion chamber, 20 is a water pipe, and 21 is a heat exchanger. The constitution and operation until the vaporized gas is produced are the same as those of the above-mentioned invention example, but the mixing chamber 10 provided downstream of the vaporizer 4
A flame port 11 connected to the mixing chamber 10, a secondary air chamber 12 provided on the outer periphery of the mixing chamber, and a secondary air port 13 connected to the secondary air chambers 12 alternately arranged in parallel with the flame port 11, A bypass air chamber 14 provided downstream of the secondary air chamber 12, and a bypass basic port 16 and a bypass port 17 connected to the secondary air chamber 12 and the bypass air chamber 14.
And a bypass valve 15 that controls the amount of air in the bypass port 17,
A flame plate 18 is arranged so as to guide the bypass air ejected from the bypass chamber 14 downstream. Further, a combustion chamber 19 and a heat exchanger 21 equipped with a water pipe 20 are provided downstream thereof. Fuel is supplied from the oil supply pipe 7 to the rotor 3 that is rotated by the motor 2, and the fuel that has moved upward on the surface of the rotor 3 is blown to the carburetor 4 by the shaker plate 9 and becomes vaporized gas into a mixture gas 10. Be guided. On the other hand, combustion fan 1
A part of the air sent by is introduced into the mixing chamber 10 as primary air and mixed with the vaporized gas. Further, the remaining air becomes secondary air and is guided to the secondary air chamber 12. After that, when the maximum combustion amount is reached, the bypass valve 15 closes and almost all the secondary air is ejected from the secondary air port 13 and part of it enters the bypass air chamber 14 from the bypass basic port 16 and ejects toward the flame plate 18. To be done.
Further, when the combustion amount is reduced and the TDR is made large, the bypass valve 15 is opened and a considerable amount of secondary air becomes bypass air and is guided to the bypass air chamber 14 from the bypass port 17 and ejected toward the flame plate 18. . Referring to FIG. 2, the behavior of the primary air ratio will be described assuming that the bypass valve 15 is opened when TDR = 1/2.
In the previous invention, when TDR = 1/6 is set large, the air excess ratio needs to be about m = 4.0 in order to satisfy wind resistance. At this time, as the excess air ratio increased, the primary air ratio PA increased and exceeded 100%, so the flame mouth became red hot and the flame lifted, and combustion could not be maintained. However, if the bypass valve 15 is opened with TDR = 1/2, the amount of primary air and secondary air will decrease by the amount of bypass air, so PA will decrease as shown by the broken line PA 'and will not exceed 100%. . The jetted mixed gas and the secondary air form a flame in the combustion chamber 19, and the bypass air flows out along the combustion chamber 19 to cool the combustion chamber 19. After that, it becomes a combustion gas and is heat-exchanged by a heat exchanger 21 equipped with a water pipe 20 to supply hot water.

Effects of the Invention According to the oil combustion apparatus of the present invention, the following effects can be obtained.

(1) Even if the throttle ratio is set large, the bypass valve is opened to control the primary air ratio, so that stable combustion can be maintained without the flame port becoming red hot or the flame lifting.

(2) Since the excess air ratio can be set high even when the throttle ratio is large, the wind resistance can be sufficiently satisfied.

(3) Since the bypass air flows out along the combustion chamber by the flame plate, the temperature rise in the combustion chamber is small, and the concentration of the combustion gas in the combustion chamber and the heat exchanger is low, so that no condensation occurs and the durability performance is improved. .

(4) Combustion is reduced because the drawing ratio can be increased.
The temperature of heating and hot water can be optimally set without turning on / off, and the device noise and odor are reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil combustion apparatus according to an embodiment of the present invention, FIG. 2 is a characteristic diagram showing the relationship between the primary air ratio and the throttle ratio,
FIG. 3 is a cross-sectional view of an oil burning device considered prior to the present invention. 1 ... Combustion fan, 2 ... Motor, 3 ... Rotor, 4 ...
… Vaporizer, 10 …… mixing chamber, 11 …… flame port, 12 …… secondary air chamber, 13 …… secondary air port, 14 …… bypass air chamber, 15 ……
Bypass valve, 17 …… Bypass port, 18 …… Flame plate, 19 ……
Combustion chamber, 21 ... Heat exchanger.

Claims (1)

[Claims] 1. A cone-shaped rotor for atomizing oil by rotation, a carburetor arranged around the outer periphery of the rotor, a motor for rotating the rotor, and an oil supply pipe for supplying fuel to the rotor. A combustion fan provided upstream of the vaporizer, a mixing chamber provided downstream of the vaporizer for mixing vaporized gas and primary air, a flame port connected to the mixing chamber, and an outer periphery of the mixing chamber. Secondary air chambers, the secondary air chambers alternately arranged in parallel with the flame ports and connected to the secondary air chambers, the bypass air chambers provided downstream of the secondary air chambers, the secondary air chambers and the bypasses. A bypass port connected to the air chamber, a bypass valve for controlling the amount of air in the bypass port, a flame plate arranged to guide the air flowing out of the bypass air chamber to the downstream side,
An oil burning device consisting of a combustion chamber and a heat exchanger.