JPH0282007A - Kerosene burner of vaporization type - Google Patents

Abstract

PURPOSE:To reduce odor at the time of closing a nozzle and at the same time improve the ignition performance by connecting a nozzle and an oil receiving pan through a return pipe which immerses its tip into the liquid in the oil receiving pan and driving a solenoid pump for a specified time when the nozzle is closed after the ignition operation. CONSTITUTION:Reference numeral 17 denotes a return pipe which returns the vaporized gas in an vaporizer 5 and nozzle 11 to an oil receiving pan 2, and the other end of the return pipe 17 is connected to the upper section of the oil receiving pan 2 and its tip end is immersed in the liquid fuel in the oil receiving pan 2. This return pipe 17, therefore, works to reduce odor by returning the vaporized gas in the vaporizer 5 and nozzle 10 to the liquid in the oil receiving pan 2 without releasing the gas to the atmosphere while the nozzle 10 is closed. And, a solenoid pump 3, temperature sensor element 8, and a control device 18 connected to a solenoid 13 supply fuel to the vaporizer 5 for a specified time when the nozzle 10 is closed after the ignition operation, and supplies fuel of a quantity smaller than at a steady state to provide the effect of stabilizing the vaporized gas that is jetted out at the time of ignition when the nozzle 10 is open.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vaporizing oil combustor that heats, vaporizes, and burns liquid fuel such as kerosene.

2. Description of the Related Art A conventional example of this type of vaporizing oil combustor will be explained with reference to FIG.

In the figure, 1 is a cartridge tank, and 2 is an oil pan. Reference numeral 3 denotes an electromagnetic pump for supplying liquid fuel such as kerosene (hereinafter referred to as kerosene), and is provided in the middle of the oil supply pipe 4. Reference numeral 5 denotes a vaporizer, which is installed horizontally as a whole and is composed of a central heater 6, a horizontal double tube 7 with both ends of its outer periphery closed, and a vaporizer temperature detection element 8 consisting of a thermistor.

The oil supply pipe 4 is connected to the bottom of one end of the carburetor 5, and the vaporized gas pipe 9 is connected to the top of the other end.

A nozzle 10 has a needle 12 for opening and closing a nozzle hole 11 inside. Reference numeral 13 denotes a solenoid having a valve 14 for opening the inside of the nozzle 10 to the atmosphere, and is connected to the needle 12, and the nozzle hole 11 is set normally open by a spring 15. (At the same time, the valve 14 is normally closed.) 19 is a return pipe for releasing the pressure inside the nozzle 10, and the other end of the pipe is connected to the upper part of the pan 2. 16
is a burner that sucks air using the energy of vaporized gas ejected from the nozzle 10 and burns it. A control means 20 is electrically connected to the electromagnetic pump 3, heater 6, temperature detection element 8, solenoid 13, and the like.

The operation of the conventional example having the above configuration will be explained below with reference to the timing chart shown in FIG. In the figure, the relationship between each component and the operating time is shown by diagonal lines. When the operation switch (not shown) is turned on, the control means 20 controls energization of the heater 6 and starts preheating the vaporizer 5. At this time, if the temperature of the vaporizer temperature detection element 8 is below 100°C, the heater 6 is energized, and the temperature of the vaporizer 5 gradually increases.
When the temperature exceeds 100° C., the solenoid is turned on and the valve 14 is opened, at the same time the needle 12 moves to the left in FIG. 3 to clean the nozzle 10. The temperature further rises to 200℃
When this happens, the electromagnetic pump 3 is driven, and the kerosene is sucked up from the pan 2 and supplied to the vaporizer 5. At the same time, the valve 14 is closed and the nozzle hole 11 is opened, and the vaporized gas vaporized in the vaporizer 5 passes through the vaporized gas pipe 9 and passes through the nozzle hole 11.
It is ejected to the burner 16. At this time, air is sucked in, ignited by an igniter (not shown), and combusted. vaporizer 5
The temperature is set to 200°C by the temperature detection element 8 and the control means 20.
The energization of the heater 6 is controlled to maintain a high temperature state so that the temperature does not drop below. When the operation switch is turned off for operation control, the electromagnetic pump 3 and heater 6 are turned off.
It becomes F. Next, the temperature of the vaporizer 5 gradually decreases to 200°C.
When the temperature is below, the solenoid 13 is turned off by the temperature detection element 8.
N, valve 14 opens, oil supply pipe 4 and carburetor 5,
Since the return pipe 19 is completely opened to the atmosphere, the kerosene inside is completely returned to the oil pan 2.

As explained above, in the conventional example, cleaning of the nozzle 10 is carried out twice before and after operation, when the temperature of the vaporizer 5 is 100 to 200°C, and since the nozzle 10 is normally open when the electricity is not energized, the needle 12 is stuck. There's not much to do. (For example, Japanese Utility Model Application Publication No. 59-48451) Another conventional example has almost the same configuration as above, but when the operation switch is turned on, the nozzle hole 11 is closed, the heater is energized and preheated, and the vaporizer 5 is set to a predetermined position. When the temperature reaches , fuel is supplied and turned into vaporized gas, and the nozzle hole 11 is opened to eject the vaporized gas to the burner 16 to start combustion. When the operation is stopped, the fuel supply is stopped, but the solenoid 13 is energized and the nozzle hole 11 is closed after a certain period of time so that the vaporized gas in the carburetor 5 and the nozzle 10 is discharged from the nozzle hole 11.

The oil receiver from the return pipe 19 is designed to reduce the amount of fuel collected into the pan 2. (Unexamined Japanese Patent Publication No. 61-96325)
Problems to be Solved by the Invention In the conventional example, the electromagnetic pump 3 is operated to supply fuel to the carburetor 5 at the same time as preheating of the carburetor 5 is completed, and the fuel is supplied to the nozzle hole 1.
The vaporized gas is ejected from the vaporizer 1 to start ignition, and it is ejected while mixing with the air in the vaporizer 5. As a result, a lean mixture of fuel initially comes out, which tends to result in instability, such as ignition noise and difficulty in ignition. In addition, the valve 14 opens a short time after preheating or extinguishing the fire, and the vaporized gas in the vaporizer 5 and nozzle 10 is released to the atmosphere through the oil pan 2, causing odor. .

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and includes: a) The nozzle and the oil pan are connected to a dish, and the tip of the oil pan is a return pipe whose tip is buried in the liquid in the pan. The temperature detection element installed in the vaporizer, the solenoid that opens and closes the nozzle, and the control means that supplies fuel to the vaporizer are connected, and when the nozzle closes after one igniter is activated, the electromagnetic pump is driven for a certain period of time. . (Claim 1) b) When the nozzle is closed after the ignition operation, the electromagnetic pump is driven for a certain period of time, and the amount of fuel supplied by the electromagnetic pump when the nozzle is opened is made smaller than the steady combustion amount.

(Claim 2) C) Fire extinguishing operation The nozzle is opened when the temperature of the deaerator falls to a predetermined temperature. (Claim 3) Effect The present invention is configured as described above, so that when the nozzle is closed, the return pipe provided so that the oil pan reaches the liquid in the pan, the vaporized gas in the vaporizer or the nozzle is The oil pan works to reduce odors by returning the oil to the liquid in the dish without releasing it to the atmosphere.

The control means connected to the electromagnetic pump, temperature detection element, and solenoid supplies fuel to the carburetor for a certain period of time when the nozzle is closed after ignition operation, and when the nozzle is opened, it supplies a smaller amount of fuel than in a steady state, and when ignition occurs, it is ejected. It has the effect of stabilizing the vaporized gas, and when extinguishing, the nozzle is closed until the temperature of the vaporizer falls to a predetermined temperature to prevent odor from coming out from the nozzle after extinguishing, and at that point the nozzle is opened. The oil pan acts to return the oil remaining in the return pipe to the pan due to negative pressure.

Embodiment FIG. 1 is a block diagram of a vaporizing oil combustor according to an embodiment of the present invention, and FIG. 2 is a timing chart for explaining its operation.

In the figure, 17 is a return pipe that returns the vaporized gas in the vaporizer 5 and the nozzle 11 to the oil pan 2;
The tip of the oil pan is buried in the liquid fuel in the pan 2. 18 is a control means, which includes an electromagnetic pump 3;
It is electrically connected to the heater 6, temperature detection element 8, solenoid 13, and the like. The numbers and names of the parts from the oil tank 1 to the burner 16 other than those mentioned above are the same as in the conventional example, and therefore their explanations will be omitted.

Next, the operation of this embodiment having the above configuration will be explained.

When the operation switch (not shown) is turned on, the control means 18
controls the energization of the heater 6 and starts preheating the vaporizer 5. The temperature detection element 8 detects that the vaporizer 5 is at a predetermined temperature (approximately 160
When it is detected that the temperature reaches
Close it while cleaning. At that time, the electromagnetic pump 3 is operated for a certain period of time (T1). Next, the vaporizer 5
25°C), the temperature detection element 8 detects this and
The spark plug (not shown) starts discharging (for about 20 seconds), the electromagnetic pump 3 is energized, and the oil pan is placed in the pan 3.
The amount of kerosene that is equal to or smaller than the normal combustion amount is supplied to the vaporizer 5. At the same time, the energization to the solenoid 13 is stopped, and the needle 12 is returned by the force of the spring 15.
At the same time as closing the valve 14, the nozzle hole 11 is opened, and the vaporized gas vaporized in the vaporizer 5 passes through the vaporized gas pipe 9 and is ejected from the nozzle 10 to the burner 16. At this time, the vaporized gas sucks primary air due to the eject effect when it blows out,
The mixture is mixed in the burner 16, and ignited by an igniter (not shown) in a flame hole of the burner 16 to combust. The temperature of the vaporizer 5 is maintained at a predetermined high temperature by controlling the energization of the heater 6 using a temperature detection element 8 and a control means 18.

Next, when the operation switch is turned off, the electromagnetic pump 3 and the heater 6 are turned off, and at the same time, the solenoid 13 is energized, the needle 12 is activated, the nozzle hole 11 is opened, the valve 14 is opened, and the inside of the vaporizer 5 and the nozzle are The residual vaporized gas in the oil pan 10 returns to the kerosene in the pan 2 via the return pipe 17.

As the liquid gradually cools down, the pressure becomes negative and the liquid level in the return pipe 17 rises. Subsequently, the vaporizer 5 is heated to a predetermined temperature tz (approximately 1
When the temperature detection element 8 detects that the temperature has dropped to 60℃),
The power supply to the solenoid 13 is stopped, the needle 12 is released and the nozzle hole 11 is opened, and at the same time the return pipe 1 is opened.
The liquid level in the oil pan 7 drops to the liquid level in the pan 2.

As described above, since the oil is fed for a certain period of time T□ before ignition, the discharge is made from the same concentration of vaporized gas every time when starting ignition, so the ignition noise is low, and reliable ignition is possible, and the end of the return pipe 17 is connected to the oil receiver. Since the needle 12 is buried in the liquid in the dish 2, the vaporized gas is not released into the atmosphere, so there is little odor, and the needle 12 cleans the nozzle hole 11 after each use.

Effects of the Invention According to the present invention, since the nozzle and the oil pan are connected to the pan through a return pipe whose end is submerged in the liquid, vaporized gas is not released into the atmosphere when the nozzle is closed, thereby reducing odor. effective. In addition, since the electromagnetic pump is operated for a certain period of time during preheating, the vaporized gas concentration at the start of ignition is optimized, ignition noise is reduced, and ignition performance is improved.
Furthermore, it is more effective if the amount of oil fed at the start of ignition is smaller than the steady combustion amount. On the other hand, since the nozzle is opened when the temperature of the vaporizer drops to a predetermined temperature when extinguishing a fire, it is effective in preventing fuel from flowing back into the vaporizer or nozzle even if the return pipe is submerged in the liquid. There is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a vaporizing oil combustor according to an embodiment of the present invention, FIG. 2 is a timing chart for explaining its operation, FIG. 3 is an explanatory diagram of the configuration of a conventional vaporizing oil combustor, and FIG.
The figure is a timing chart for explaining the operation. 2... Oil pan is a dish, 3... Electromagnetic pump. 5... Vaporizer, 6... Heater 8... Temperature detection element, 10... Nozzle, 11... Nozzle hole,
12... Needle, 13... Solenoid, 1
6...Burner, 17...Return pipe, 18...
control means. Appearance Hitachi Thermal Appliances Co., Ltd.

Claims (1)

[Claims] 1. A needle (12) for opening and closing the nozzle hole (11);
) is connected to a vaporizer (5) equipped with a heater (6) and a solenoid (13) that drives the needle (12) and opens and closes the nozzle hole (11). (5) and the oil pan (2) to the electromagnetic pump (3)
The liquid fuel is supplied into the vaporizer (5) by the electromagnetic pump (3), and the vaporized gas is guided to the nozzle (10) and combusted by the burner (16). In the type oil combustor, the nozzle (10) and the oil pan (2) are connected via a return pipe (17) whose tip is buried in the liquid fuel in the oil pan (2),
The vaporizer (5) is provided with a temperature detection element (8), and the temperature detection element (8) and the solenoid (13) are connected to the vaporizer (
5) is detected and the needle (12) is used to open the nozzle hole (
11) is connected to a control means (18) that opens and closes the nozzle hole (11) and drives the electromagnetic pump (3) for a certain period of time (T_1) when the nozzle hole (11) is closed after the ignition operation. 2. Detect the temperature of the vaporizer (5), open and close the nozzle hole (11) with the needle (12), and after the ignition operation, open and close the nozzle hole (11).
Electromagnetic pump (3) for a certain period of time (T_1) when 1) is closed.
), and the vaporizer (5) reaches a predetermined temperature (t_1
2. The vaporizing oil combustor according to claim 1, further comprising control means (18) for causing the amount of fuel supplied by the electromagnetic pump (3) to be smaller than that during steady combustion when the nozzle hole (11) is opened at the time when the nozzle hole (11) is opened. 3. Detect the temperature of the vaporizer (5), open and close the nozzle hole (11) with the needle (12), and after extinguishing the vaporizer (5)
The vaporizing oil combustor according to claim 1 or 2, further comprising a control means (18) for opening the nozzle hole (11) when the temperature of the nozzle hole (11) drops to a predetermined temperature (t_2).