JPH064212Y2 - Liquid fuel combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a fuel supply device in a siphon nozzle type liquid fuel combustion device.

2. Description of the Related Art In the conventional device of this type, the pressure of compressed air sent from an air pump to a siphon nozzle via a delivery pipe is adjusted to a constant pressure by a pressure regulator from the start of operation and then blown.

However, when the temperature in the combustion chamber is low as in the case of such a conventional device or when the operation is stopped for a long time, the combustion air does not have a normal flow velocity in the entire combustion chamber. A large amount of fuel set for steady combustion is sent to it, and secondary oxidation of the combustion gas due to heat generation from the inner surface of the furnace tube is less likely to occur, so incomplete combustion is likely to occur and foul odor or poor ignition occurs. Was there.

Furthermore, when reigniting immediately after the operation is stopped, the temperature in the combustion chamber is high due to residual heat, so the sprayed fuel vaporizes at once and burns. For this reason, although it is mild, there is an inconvenience that an explosion is generated, black smoke, and soot are generated because an explosion occurs in the combustion chamber.

Therefore, in view of the drawbacks of the conventional technique, it is an object of the present invention to provide a device that reduces the fuel supply amount at the start of operation.

Means for Solving the Problems That is, according to the present invention, compressed air is blown from an air pump through a delivery pipe to a siphon nozzle arranged in a combustion chamber, and fuel is sucked and sprayed from a fuel tank through a suction pipe. Then, in the liquid fuel combustion apparatus configured to burn, a motor that drives an air pump that blows compressed air to the delivery pipe and a fan that blows air to the periphery of the combustion chamber divided by the furnace cylinder are commonly used. At the same time, the present invention is achieved by a liquid fuel combustion apparatus in which a valve is connected in the middle of the delivery pipe via a branch pipe and the valve is opened for a predetermined time from the start of operation.

In the liquid fuel combustion device of the siphon nozzle type, due to the ejector effect that occurs in the siphon nozzle due to the air pressure sent from the air pump through the delivery pipe,
The suction pipe side has a negative pressure to suck the fuel from the tank, and the sucked fuel is atomized by the air injection. The atomized fuel is ignited in the combustion chamber and burns to generate hot air, which heats an object.

Then, when the combustion is started, the air pump is operated, and at the same time, the valve of the branch pipe is opened only for a predetermined time so that the air pressure in the delivery pipe becomes lower than that in the steady combustion. Then, the amount of fuel sucked from the tank through the siphon nozzle also decreases, and as a result, the combustion amount decreases only for a predetermined time from the start of operation.

On the other hand, the same large flow rate of air as that during normal combustion is sent to the periphery of the combustion chamber by a fan having a common motor, and the combustion chamber is quickly cooled even if it is ignited immediately after extinction.

Embodiment Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIG.

In the figure, reference numeral 1 denotes a combustion outer cylinder arranged on a fuel tank 2, and inside the outer cylinder 1, a combustion chamber 5 composed of a cylindrical furnace cylinder 3 and a shielding plate 4 is installed. Reference numeral 4 is a cylindrical shielding plate that covers the periphery of the furnace tube 3. At one end of the combustion chamber 5, an ignition rod 7 and a siphon nozzle 8 that are connected to the igniter 6 and ignite fuel in the combustion chamber 5 are installed. The siphon nozzle 8 is connected to the fuel tank 2 via a suction pipe 9, and is further connected to an oilless rotary vane type air pump 11 via a delivery pipe 10 and a pressure regulator 12. In the middle of the delivery pipe 10, a tip is opened to the atmosphere, and a small branch pipe 13 having a diameter of about 1.5 mm is connected, and a solenoid valve 14 is connected to the pipe 13.
Are connected to open and close the pipe 13. A motor 15 drives the blower fan 16 and the air pump 11.

In the above-described configuration, the device according to the present invention operates the air pump 11 in the same manner as in the prior art with the solenoid valve 14 closed during combustion to suck the fuel with the siphon nozzle 8 and atomize the fuel. To burn in the combustion chamber.

Next, at the start of combustion, the solenoid valve 14 is operated only for a predetermined time to open the pipe 13, and a part of the compressed air in the delivery pipe 10 is discharged to the atmosphere. Then, since the air pressure in the delivery pipe decreases, the suction force on the suction pipe 9 side due to the ejector effect in the siphon nozzle 8 also decreases, and the amount of fuel supplied to the siphon nozzle 8 also decreases. Therefore, the amount of combustion decreases at the start of combustion. At this time, the motor 15 and the air pressure regulator 12 may remain operating, and the pressure decreases, so that the motor 15 and the air pressure regulator 12 rotate with a small load. The opening / closing of the solenoid valve 14 is, for example, the second
As shown in the figure, a control circuit in which a motor 15 and a delay relay T that drives the solenoid valve 14 are connected in parallel may be used.

According to the configuration of this embodiment, when the solenoid valve 14 is opened only for a predetermined time from the start of the operation, a part of the compressed air is discharged, so that the fuel supply amount decreases only during that time. Then, even if the temperature in the combustion chamber is lowered, only a small amount of fuel is sent, incomplete combustion does not occur, and precombustion that heats the combustion chamber is performed.
Further, even when re-ignition is performed immediately after the operation is stopped, since the same large amount of air is blown around the furnace tube that covers the combustion chamber as in the case of normal combustion, the temperature of the combustion chamber decreases and it is vaporized. It does not cause an explosion phenomenon due to the small amount of fuel.

According to our experiments, the air pressure inside the delivery pipe 10 was 150 mmHg during steady combustion, but the solenoid valve 14
When opened, a desirable combustion state was obtained at about 60% to 70% of 100 mmHg. Further, the time for operating the solenoid valve 14 is the time until the temperature of the furnace cylinder 3 and the shield plate 4 rises, and 5 to 10 seconds was appropriate in this experiment.
These set values are determined in consideration of the capacity of the air pump 11, the pipe 13, the ejector effect characteristics of the siphon nozzle 8 and the like because the air pressure to the nozzle 8 decreases and the fuel supply amount decreases at the same time.

Effects As described above, according to the present invention, after the start of operation, the combustion amount is reduced from that during steady combustion, and the temperature of the combustion chamber is reduced by blowing air around the combustion chamber, which causes the adverse effects of incomplete combustion immediately after ignition. It will be greatly reduced and the explosion at the time of re-ignition immediately after extinguishing will not occur.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an apparatus showing an embodiment of the apparatus according to the present invention, and FIG. 2 is a circuit diagram for controlling the operation of the solenoid valve of the apparatus of FIG. DESCRIPTION OF SYMBOLS 1 ... Combustion outer cylinder, 2 ... Fuel tank 3 ... Furnace cylinder, 4 ... Shielding plate 5 ... Combustion chamber, 6 ... Igniter 7 ... Ignition rod, 8 ... Siphon nozzle 9 ... Suction pipe, 10 ... Delivery pipe 11 ... Air pump, 12 ... Pressure regulator 13 ... Branch pipe, 14 ... Solenoid valve 15 ... Motor, 16 ... Blower fan

Claims (2)

[Scope of utility model registration request] 1. A liquid fuel configured to blow compressed air through a delivery pipe to a siphon nozzle arranged in a combustion chamber, suck up and atomize fuel from a fuel tank through a suction pipe, and burn the liquid fuel. In the combustion device, the motor that drives the air pump that blows compressed air to the delivery pipe and the fan that blows air to the periphery of the combustion chamber divided by the furnace cylinder are shared, and a branch pipe is installed in the middle of the delivery pipe. A liquid fuel combustion apparatus characterized in that a valve is connected through the valve and the valve is opened for a predetermined time from the start of operation. 2. The liquid fuel combustion apparatus according to claim 1, wherein the valve connected to the suction pipe via a branch pipe is an electromagnetic valve.