JPH0470525B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a liquid fuel combustion device that vaporizes and burns liquid fuel such as petroleum, and this device can be used, for example, as a combustion section of a heater. It is something.

<Prior art and its problems> As this type of liquid fuel combustion device, one in which the strength of combustion can be switched is conventionally provided. However, in conventional devices capable of switching the intensity of combustion, the only means for adjusting the air volume was to provide an orifice on either the inlet or outlet side of the blower fan. Therefore, even if the air volume can be changed between strong and weak by switching the rotation speed of the blower fan in conjunction with switching the strength of combustion, the air volume adjustment using the orifice will be at the same ratio for each of the strong and weak air volumes. It simply changed the air volume. In other words, in conventional devices, it is not possible to adjust the air volume independently under the conditions of strong combustion and weak combustion, so it is not possible to optimize combustion by delicately adjusting the air volume during weak combustion, for example. There was a problem.

<Purpose> Therefore, the present invention solves the drawbacks of the above-mentioned prior art,
The present invention relates to a liquid fuel combustion device that can independently adjust the air volume in a weak combustion mode and ensure combustion with an appropriate air volume.

<Means for solving the problems> The device of the present invention uses primary air and secondary air, and by sending the primary air to the vaporizer 2, the liquid such as petroleum introduced into the vaporizer 2 is mixed with fuel,
This is a liquid fuel combustion device that vaporizes the fuel and supplies secondary air as combustion air for the vaporized fuel, in which a secondary air passage 6 is first branched from the air guide passage 5, and a secondary air passage 6 is branched from the branched part. A main on-off valve 9 for adjusting the amount of primary air is provided in the middle of the air guide path 5 leading to the downstream primary air passage 10, and bypass ventilation is provided in a manner that bypasses the gate 12 that is opened and closed by the main on-off valve 9. The main on-off valve 9 is provided with a small hole 9a for ventilation, and the bypass ventilation path 14 is provided with passage area adjustment means.

<Function> By first branching the secondary air passage 6,
This makes it easier to adjust the amount of primary air supplied later. The primary air amount is adjusted by the main on-off valve 9, the bypass ventilation passage 14, and the small hole 9a provided in the main on-off valve 9. That is, the primary air amount is roughly adjusted by the main on-off valve 9, and further finely adjusted by the bypass ventilation passage 1.
By making the adjustment in step 4 and using the small hole 9a, sufficient fine adjustment can be made from a large air volume to a small air volume. In addition to participating in the above-mentioned adjustment, the small hole 9a has an effect that when the main opening/closing valve 9 is closed during weak combustion, no matter what state the bypass ventilation passage 14 is in (fully closed or closed). (in some cases), it plays the role of ensuring the minimum required amount of ventilation.

<Example> FIG. 1 is an overall configuration diagram of a liquid fuel combustion apparatus showing an example of the present invention, and FIGS. 2 and 3 are sectional views each illustrating the main parts. Vaporizer 2 in case 1
is provided. Oil flows from discharge port 3 to vaporizer 2
discharged inside. 4 is a heater. Air is sent from a blower fan (not shown) through the air guide path 5,
A part of it is first branched into a secondary air passage 6 and enters the case 1. The secondary air that entered case 1 is
A portion of it passes through the cylinder 7 at the center of the carburetor 2 and exits to the center of the burner flame hole 8. Other secondary air is supplied from around the burner flame hole 8 through the periphery of the vaporizer 2 . The remainder of the air sent through the air guide path 5 is sent to the primary air passage 10 from the primary air passage opening 10a via the main opening/closing valve 9, and then to the vaporizer 2. The primary air sent to the vaporizer 2 is mixed with the discharged petroleum, vaporized, rises, and is burned in the burner flame hole section 8.

The main on-off valve 9 has a control section 11 with a built-in solenoid.
The main on-off valve 9 is moved back and forth as shown in FIG. 2 during strong combustion.
Gate 12 opens. Further, during weak combustion, the main on-off valve 9 advances and the gate 12 is closed. In addition, the main opening/closing valve 9 is provided with a small hole 9a, so that even if the gate 12 is closed during weak combustion, some air can still flow through the small hole 9a.
It is designed to pass through a. That is, the small holes 9a function to ensure the minimum amount of ventilation during weak combustion, and the bypass passage 14, which will be described later, is connected to the adjustment screw 15.
Even if the combustion chamber is completely closed, it is possible to safely and reliably secure the minimum amount of air necessary for weak combustion. Reference numeral 13 denotes a biasing spring for the main opening/closing valve 9.

A bypass ventilation passage 14 is provided from the downstream side of the point where the secondary air passage 6 of the air guide passage 5 branches, bypassing the gate 12 that is opened and closed by the main on-off valve 9.
will be provided. The bypass air passage 14 has a smaller passage cross-sectional area than the air guide passage 5. This bypass ventilation passage 14 further includes an adjustment screw 15 as a means for adjusting the cross-sectional area of the passage.
is inserted. By turning this adjustment screw 15, the passage cross-sectional area of the bypass ventilation passage 14 is adjusted, and the amount of air flowing through the bypass ventilation passage 14 is adjusted. The air flowing through the bypass ventilation passage 14 is sent as primary air to the primary air passage 10 from the primary air passage opening 10a.

As shown in FIG. 2, during strong combustion when the main on-off valve 9 is open, a large amount of air passes through the gate 12 and enters the primary air passage 10 from the primary air passage opening 10a. In this case, the effect on the air volume by adjusting the opening of the bypass ventilation passage 14 is small. On the other hand, as shown in FIG. 3, during weak combustion when the main on-off valve 9 is closed, the air amount from the bypass ventilation passage 14 is added to the air amount from the small hole 9a of the main on-off valve 9. The influence is large, and the primary air flow rate can be effectively adjusted during weak combustion. Therefore, for example, if the air volume during strong combustion is properly determined in advance by the air flow rate of a fan, the appropriate air volume during weak combustion can be adjusted independently using the bypass ventilation passage 14 and its adjustment screw 15. Appropriate air volume can be adjusted and supplied during both strong and weak combustion.

<Effects> The present invention consists of the above configuration and operation, and Claim 1
According to the liquid fuel combustion device described in , both primary air and secondary air necessary for combustion are supplied through the air guide path 5, and the secondary air path 6 is first supplied from the air guide path 5.
By branching off, it becomes possible to sufficiently adjust the amount of primary air, which requires fine adjustment, afterwards. Then, the primary air is adjusted by the main on-off valve 9, the bypass ventilation passage 14 with passage area adjusting means, and the small hole 9a provided in the main on-off valve 9.
With these two means, it is possible to adjust the air volume from large to small with sufficient precision. In particular, according to the present invention, it is possible to sufficiently adjust the air flow rate during weak combustion, and optimization of weak combustion can be achieved. Furthermore, in the present invention, even if switching from weak combustion to strong combustion by opening the main on-off valve 9, the effect of fine adjustment of air volume during weak combustion has almost no effect on the air volume during strong combustion. There is an advantage that readjustment of adjustment means other than the main on-off valve 9 is not necessary when switching to combustion. Other small holes 9a provided in the main on-off valve 9
Therefore, no matter what state the bypass ventilation passage 14 is in, the minimum required air volume during weak combustion can be ensured, and combustion safety can be ensured.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a liquid fuel combustion apparatus showing an embodiment of the present invention, and FIGS. 2 and 3 are sectional views each illustrating the main parts. 2: vaporizer, 5: air guide path, 6: secondary air path,
8: Main on-off valve, 10: Primary air passage, 12: Gate, 14: Bypass ventilation passage, 15: Adjustment screw.

Claims (1)

[Claims] 1 Using primary air and secondary air, the primary air is sent to the vaporizer 2 to be mixed and vaporized with a liquid fuel such as petroleum that has also been introduced into the vaporizer 2, and the secondary air is In this liquid fuel combustion device, a secondary air passage 6 is first branched from the air guide passage 5, and the air guide is supplied as combustion air for the fuel. A main on-off valve 9 for regulating the amount of primary air is provided in the middle of the passage 5, and a bypass ventilation passage 14 is provided in a manner that bypasses the gate 12 that is opened and closed by the main on-off valve 9.
The main on-off valve 9 is provided with a small hole 9a for ventilation.
A liquid fuel combustion device further characterized in that the bypass ventilation passage 14 is provided with a passage area adjusting means.