JPH0996414A - Fuel supply device of oil burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a vaporizing power of fuel in a fuel supply structure of an oil burner. SOLUTION: An oil tank 1 is connected to a burner with a fuel pipeline 3. A pulse-driven electromagnetic pump 4 is mounted on the way of the fuel pipeline 3. The drive frequency of the electromagnetic pump 4 is changed, thereby making a combustion rate variable. A nozzle-shaped size reduction area 5 is provided on the side of a burner 2 of the fuel pipeline 3. A pump control 6 of the electromagnetic pump 4 is provided with the function which changes frequently ON time of a pulse which drives the fuel pump 4 at a set rhythm in relative length, and vaporization of fuel is stimulated by dispersing dropping positions of fuel in the vaporization part of the burner 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supplying fuel to a burner of an oil combustor.

[0002]

2. Description of the Related Art A burner of an oil combustor and an oil tank are connected by a fuel pipe, and an electromagnetic pump capable of arbitrarily changing a fuel flow rate by pulse drive is attached in the middle of the fuel pipe.
The drive frequency of the electromagnetic pump is changed according to the amount of heat generation required by the oil combustor, and a fixed amount of fuel is supplied to the burner each time the piston reciprocates.

Then, the fuel sent from the fuel pipe to the burner is dripped and supplied mainly to the vaporizing section heated by the feedback of combustion heat, and the fuel gas vaporized in the vaporizing section is completely burned in the burner and in the combustion chamber following the burner. It burns.

On the other hand, in the pulse-driven electromagnetic pump, the piston is driven in synchronization with the commercial AC power source, and when the pressure on the discharge side becomes equal to or higher than the specified pressure, the fuel is returned to the inlet side of the electromagnetic pump to provide a high discharge pressure. Unlike the high pressure type that maintains, the piston synchronizes with the variable frequency and has a short ON time and a long OFF.
Fuel is discharged by repeating the time,
The discharge amount per unit time is changed by changing the OFF time interval. For this reason, the fuel discharged from the electromagnetic pump is sent to the burner with almost no flow path resistance, and the non-return ability of the valve inside is generally about atmospheric pressure.

[0005]

Since most of the burners of this type are energy-saving oriented, the vaporization part is heated by the feedback of combustion heat, and if the fuel supply is increased in order to increase the calorific value. Since the fuel dropping positions are the same, heat cannot be supplied to the heat radiation when the fuel is vaporized, and the temperature of the vaporization part is lowered, so that there is a possibility that unvaporized fuel may accumulate in the vaporization part. Therefore, as a structure to obtain a large amount of vaporized gas by using a vaporizing section with a certain area, a structure is provided in which multiple fuel pipes are provided and the fuel is vaporized in small amounts at multiple locations to increase the total vaporized amount. Although it was put to practical use, it had a problem that the structure was complicated, workability such as maintenance was poor, and it could not be carried out at low cost.

[0006]

In order to solve the above-mentioned problems, the present invention connects an oil tank 1 and a burner 2 with a fuel pipe 3, and a piston that reciprocates by pulse drive is provided in the middle of the fuel pipe 3. In an oil combustor in which the electromagnetic pump 4 provided is attached and the driving frequency of the electromagnetic pump 4 is changed to change the combustion amount, a reduced diameter portion 5 such as a nozzle is provided in the fuel pipe 3 from the burner 2 to the electromagnetic pump 4. Provided,
A pump controller 6 is provided for changing the ON time of a pulse for driving the fuel pump 4 in a constant rhythm, to change the ON time of the pulse frequently, and the fuel supply positions of the burners 2 are scattered.

Further, from the discharge portion of the electromagnetic pump 4 to the reduced diameter portion 5
The pressure accumulation means 7 is provided in the fuel pipe 3 up to and the fuel is dropped in a concentrated manner to a fuel supply position distant from the fuel pipe 3 during a long ON time.

As a concrete structure of the pressure accumulating means 7,
The pressure accumulating means 7 includes a blower 8 for sending combustion air, and the blower 8
Of the fuel pipe 3 on the electromagnetic pump 4 side of the reduced diameter portion 5 and an air pipe 9 that communicates with the electromagnetic pump 4.
A part of the fuel sent by is flown into the air pipe 9, and the supply pressure of the fuel and the blast pressure are balanced in the air pipe 9, and a very simple structure in which the air pipe 8 is substantially added is used. It was possible to carry out.

[0009]

The present invention has the above-mentioned structure, and in the electromagnetic pump 4 which supplies fuel by pulse drive, as is well known, the fuel flow rate is generally changed depending on the length of the OFF time.
Further, according to the experiment, in the embodiment of the electromagnetic pump 4 of such a flow rate type, the fuel flow rate changes even if the ON time is long or short, and the present invention utilizes the mechanism to reduce the diameter of the fuel pipe 3 to the reduced diameter portion 5. Is provided to increase the pressure change of the fuel pipe 3 at the time of fuel supply.

Therefore, since the flow rate of the fuel sent from the electromagnetic pump 4 is limited by the reduced diameter portion 5, it takes time for the piston of the electromagnetic pump 4 to move to the movable end, and when the ON time is short. Since the current is stopped while the piston is moving and the piston returns to the old position, the maximum pressure of the fuel pipe 3 becomes low, and the fuel reaches the portion near the fuel pipe 3.

When the ON time is long, the piston surely moves to the movable end, so that the maximum pressure of the fuel pipe 3 becomes high and the fuel reaches the portion far from the fuel pipe 3. For this reason, the position where the fuel reaches changes due to the action of the pump controller 6 that repeats the short rhythm of the ON time, and the vaporization trouble of the fuel when a large flow rate is flowed can be solved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiments shown in the drawings. 1 is an oil tank of an oil combustor, 2 is a burner provided in the vicinity of the oil tank 1, and 3 is fuel for connecting the oil tank 1 and the burner 2 to each other. Pipes 4 are electromagnetic pumps mounted in the middle of the fuel pipe 3. The electromagnetic pump 4 has a piston that reciprocates by pulse drive, and changes the drive frequency of pulse drive to change the fuel flow rate.

Reference numeral 10 denotes a bottomed cylindrical pot which constitutes the vaporizing portion of the burner 2, 10a denotes a large number of air holes provided on the side wall of the pot 9, and 11 denotes a disc-shaped or ring-shaped auxiliary burner mounted inside the pot 10. It is a member, and the tip of the fuel pipe 3 extends through the side wall of the pot 10 and extends into the pot 10. Therefore, the fuel sucked up from the oil tank 1 by the electromagnetic pump 4 is sent to the burner 2 and drips from the tip of the fuel pipe 3 to the bottom plate of the pot 10 which constitutes the vaporization section.

A blower 8 is provided near the burner 2, and a blower 12 is provided.
Is an air passage that connects the air blower 8 and the air hole 10a of the pot 10, and 13 is an ignition heater that also serves as preheat and is provided in the pot 10. To do. Then, when the electromagnetic pump 4 is driven to drip fuel into the pot 10, the fuel is vaporized by the heated bottom surface of the pot 10 and ignition combustion is started by the ignition heater 13 which is red-hot. on the other hand,
When the blower 8 is operated, combustion air is blown into the blower passage 12 and the air holes 1
It is supplied into the pot 10 via the fuel gas 0a and mixed with the vaporized gas / combustion gas of the fuel, and stable combustion is performed by the function of the auxiliary combustion member 11.

Reference numeral 5 denotes a reduced diameter portion which is located in the fuel pipe 3 on the burner 2 side of the electromagnetic pump 4 and which is formed by reducing the opening area of the fuel pipe 3. In the embodiment, the fuel pipe 3 faces the inside of the pot 10. The diameter is reduced to form the reduced-diameter portion 5 and a fuel dropping nozzle is formed.

In the flow rate type electromagnetic pump 4 which varies the fuel flow rate by pulse driving, the piston is driven by energizing for a unit time, and at this time, the fuel is sent to the discharge side. When the flow path resistance on the discharge side is zero, the piston moves to the movable end and discharges a predetermined amount of oil even if the ON time is short, and the flow rate changes by changing the drive frequency. is there.

In the present invention, since the nozzle-shaped reduced diameter portion 5 is provided in the middle of the fuel pipe 3, the fuel delivered by the piston is not discharged smoothly, and it takes time for the piston to move to the movable end. is there. Therefore, when the ON time is short, the energization is stopped while the piston is moving, and the piston returns to the old position, so that the maximum pressure of the fuel pipe 3 becomes low. When the ON time is long, the piston moves to the movable end and the maximum pressure of the fuel pipe 3 increases.

Reference numeral 6 indicates ON of a pulse for driving the electromagnetic pump 4.
This is a pump controller that changes the time length at a fixed rhythm, and the fuel that drips from the tip of the fuel pipe 3 depending on the length of the ON time drips far or near the tip of the fuel pipe 3. It has become possible to obtain two fuel dropping positions using one set of fuel pump and fuel pipe. Specifically, the pump controller 6 performs an operation in which the ON time is combined with the long time once and the short time twice, and the ON time is repeated alternately.

Reference numeral 7 is a pressure accumulating means provided in the fuel pipe 3 between the discharge side of the electromagnetic pump 4 and the reduced diameter portion 5, and part of the fuel sent to the burner 2 by the electromagnetic pump 4 is reduced by the reduced diameter portion 5. Since the passage flow rate is limited, when the internal pressure of the fuel pipe 3 is increased, the internal pressure of the pipe 3 is sent to the pressure accumulating means 5, and when the fuel starts to be sent to the pressure storage means 7, the internal pressure of the pipe 3 is kept substantially constant. Then, if the ON time is long, the fuel stored in the pressure accumulating means 7 even after the piston has moved to the movable end is continuously sent to the burner 2 while passing through the reduced diameter portion 5 while maintaining substantially the same pressure, and is distant. The fuel is sent in a concentrated manner at the dropping position of.

If the ON time is short, the pressure accumulating means 7
Since the movement of the piston is stopped before effectively operating, the internal pressure of the fuel pipe 3 is low, and the vicinity of the tip of the fuel pipe 3 is the main fuel dropping position. Therefore, when the pump controller 6 changes the ON time at a constant rhythm of long and short, the fuel dripping position can be specified in two places, near the fuel pipe 3 and far.

Reference numeral 9 indicates the vicinity of the discharge port of the blower 8 for supplying combustion air, and the fuel pipe 3 on the electromagnetic pump 4 side of the reduced diameter portion 5.
The air accumulating means 7 is constituted by an air pipe 9 and a blower 8 for supplying pressure. Then, the fuel flowing from the fuel pipe 3 into the air pipe 9 and the blowing pressure of the blower 8 are balanced to form the pressure accumulating means 7. At this time, in the positional relationship of the ends of the air pipe 9, when the blower 8 side is low as in the embodiment, the highest position in the middle of the air pipe 9 is made higher than the highest position of the fuel pipe 3 so that the fuel is supplied to the air pipe 9. Trouble that flows out through 9 can be prevented.

That is, when the ON time of the electromagnetic pump 4 is long, the internal pressure of the fuel pipe 3 increases with the movement of the piston and the flow to the burner 2 is restricted by the reduced diameter portion 5, so the fuel overcomes the blowing pressure. Flow into the air pipe 9 and the internal pressure of the fuel pipe 3 is kept substantially constant. Then, the fuel flowing into the air pipe 9 is sent to the burner 2 even after the movement of the piston is stopped, and the fuel is concentratedly sent from the fuel pipe 3 to a dripping position distant from the fuel pipe 3.

[0023]

Since the present invention has the above-mentioned structure and operation, it is possible to form two fuel dropping positions of the burner 2 with only one combination of the electromagnetic pump 4 and the fuel pipe 3. The vaporization of the fuel is promoted when the fuel flow rate is increased, and the combustion of large calorific value is stable.

Further, since the conventional pump controller 6 is simply provided with a structure in which the ON time is changed frequently with a constant rhythm, the pump controller 6 is remodeled only slightly and the cost is increased. Very few, and easy to implement.

On the other hand, in order to stabilize combustion with a large calorific value,
It is preferable not only to disperse the fuel dropping positions but also to specify and concentrate the dispersal positions.
By providing the pressure accumulating means 7 in the above, the drip position can be concentrated when the ON time is long, and the fuel vaporization performance is improved.

Further, when the blast pressure of the combustion blower 8 is used as the pressure accumulating means 7, it can be carried out by adding one air pipe 9, which can be constructed at a very low cost and has excellent practicability. It is a thing.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil combustor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts of a burner portion of an oil combustor showing an embodiment of the present invention.

[Explanation of symbols]

 1 Oil Tank 2 Burner 3 Fuel Pipe 4 Electromagnetic Pump 5 Reduced Diameter Section 6 Pump Controller 7 Accumulation Means 8 Blower 9 Air Pipe

Claims (3)

[Claims] 1. An oil tank 1 and a burner 2 are connected to a fuel pipe 3
And an electromagnetic pump 4 equipped with a piston that reciprocates by pulse drive in the middle of the fuel pipe 3 and changing the drive frequency of the electromagnetic pump 4 to change the combustion amount. To the electromagnetic pump 4, a reduced diameter portion 5 such as a nozzle is provided in the fuel pipe 3, and a pump controller 6 is provided to change the ON time of the pulse for driving the fuel pump 4 frequently with a constant rhythm. A fuel supply device for an oil combustor characterized in that the supply positions are scattered. 2. The fuel pipe 3 from the discharge part of the electromagnetic pump 4 to the reduced diameter part 5 is provided with a pressure accumulating means 7, and the fuel is concentratedly dropped to a fuel supply position distant from the fuel pipe 3 during a long ON time. Item 2. A fuel supply device for an oil combustor according to Item 1. 3. The pressure accumulating means 7 is a blower 8 for sending combustion air.
And the electromagnetic pump 4 rather than the discharge port of the blower 8 and the reduced diameter portion 5.
The fuel pipe 3 is formed by an air pipe 9 that communicates with the middle of the fuel pipe 3, and a part of the fuel sent by the electromagnetic pump 4 flows into the air pipe 9, so that the fuel supply pressure and the blast pressure are in the air pipe 9. The fuel supply device for an oil combustor according to claim 1, which is balanced.