JP3063350B2 - Liquid fuel supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel supply system for supplying fuel to a combustion section such as an oil fan heater.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, an electromagnetic pump 31 is provided above a tank 30 holding liquid fuel, and the electromagnetic pump 31 sucks up liquid fuel in the tank 30 as shown in FIG. The fuel is supplied to a combustion section 33 through an oil supply pipe 32 and burned. The electromagnetic pump drives the discharge valve 35 and the suction valve 36 in accordance with the vertical movement of the plunger 34 as shown in FIG. 7 to suck fuel from the tank 30 and supply it to the combustion section 33. .

[0003]

However, in the above-described conventional configuration, when the liquid fuel in the tank 30 is drained after the end of the season and stored for a long time, or when the tank is transported,
When the electromagnetic pump 31 is replaced for maintenance or the like, liquid fuel partially escapes into the electromagnetic pump 31 and air enters, so that a two-phase state in which liquid fuel and air are mixed is established.

When the operation of the apparatus is started by supplying fuel in the two-phase state, air and liquid fuel are supplied to the combustion section 33 alternately. In other words, when the plunger 34 is air and the tip of the oil feed pipe 32 is liquid fuel, the viscosity of the air is much lower than that of the liquid fuel. The fuel is discharged to the combustion section 33 in an amount several times to several tens times the normal amount. Next, the liquid fuel is supplied to the plunger 34 and the oil supply pipe 32.
Air comes to the tip, and the plunger 34 moves normally, but air is discharged from the tip of the oil feed pipe 32.

The supply of excess liquid fuel and air to the combustion section 33 continues alternately until the air in the electromagnetic pump 31 is completely removed, during which the combustion section 33 ignites or misfires.
In addition, excessive combustion or lift combustion causes repeated combustion with a large amount of unburned gas, severe odor, soot, and carbon monoxide from the equipment, causing users to feel uncomfortable or unsafe. give.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to reduce the generation of a large amount of unburned gas, severe odor, soot and carbon monoxide from equipment.

[0007]

In order to achieve the above-mentioned object, a liquid fuel supply device according to the present invention supplies a fuel to a tank through which fuel is supplied from the tank to a vaporization section of a combustion section through an oil supply pipe. And a pump drive control for driving the plunger upward to discharge fuel when the power to the solenoid of the electromagnetic pump is turned on, and to lower the plunger to suck fuel when the solenoid is turned off. The electromagnetic pump includes a means for opening the discharge valve, and the pump drive control unit gently moves the plunger upward.
And the pump drive control unit
When turning on the power, gently move the plunger up to
The discharge valve is opened while restricting the discharge of
After temporarily held in a state, O energizing the solenoid
The fuel is returned by the suction effect generated by suddenly moving the plunger downward by FF.

[0008]

According to the present invention, the two-phase liquid fuel mixed with air when used for the first time in the early season, etc., is recovered in the tank by opening the discharge valve in the electromagnetic pump when the equipment is turned on. And the generation of a large amount of unburned gas, severe odor, soot, carbon monoxide, and the like from the initial equipment for use can be suppressed.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, in FIG. 2, reference numeral 1 denotes a main body case, and 2 denotes a tank for holding liquid fuel disposed on a side portion of the main body case 1, and a detachable cartridge tank 3 is disposed on the upper part thereof. 4 is an electromagnetic pump disposed on the upper surface of the tank 2,
Reference numeral 5 denotes an oil supply pipe, and reference numeral 6 denotes a combustion unit which vaporizes and burns the liquid fuel supplied by the electromagnetic pump 4 and has a configuration similar to that of the related art shown in FIG. A combustion cylinder 7 is provided. A duct 9 mixes the indoor air flow from the convection blower 8 with the above-mentioned combustion exhaust gas to generate hot air.

Next, an electromagnetic pump for supplying a liquid fuel will be described. In FIG.
A discharge connection portion 11 for connecting the oil feed pipe 5 is connected to a distal end of the pipe, which forms a flow path for the liquid fuel. Reference numeral 12 denotes a discharge valve seat provided in the discharge coupling portion 11 and has a discharge port 12a. Reference numeral 13 denotes a discharge valve which opens and closes the discharge port 12a, which is made of a magnetic material, opens when discharging liquid fuel, and closes when discharging by a discharge spring.

A plunger 15 is located below the discharge valve seat 12 and moves up and down.
6, the liquid fuel is sucked between the discharge valve seat 12 and the discharge valve seat 12, and the suction valve 16 is closed by a suction spring 17 to move upward to push the liquid fuel upward. And are supported by springs 19 and 20.

Reference numeral 21 denotes a suction pipe disposed at the lower end of the pipe post 10, and a net-shaped filter 22 is attached to the lower end of the suction pipe so as to filter dust and the like so as not to enter. 23
Is a solenoid disposed around the pipe post 10 for opening the discharge valve 13 and moving the plunger 15 up and down. The solenoid valve 23 transmits magnetic lines of force from the solenoid 23 to the pipe post 10, and the discharge valve 13 Upper magnetic path 24 that lifts up
And a middle magnetic path 25 for lifting the plunger portion 15 upward.
And a lower magnetic path 26 for transmitting magnetic lines of force apart from the lower part.

Reference numeral 27 denotes a pump drive control unit for controlling the energization of the solenoid 23. The pump drive control unit 27 receives an output from the combustion control unit 28 and operates as shown in FIG. The combustion control unit 28 operates based on an operation start command from the operation switch 29, issues a combustion start command to the pump drive control unit 27 according to a predetermined program, and starts combustion. .

In the above configuration, generally, fuel is supplied from the cartridge tank 3 into the tank 2 so as to maintain a constant oil level, and is sucked from the tank 2 to the combustion section 6 via the oil supply pipe 5 by the electromagnetic pump 4. Supplied. Then, the gas is burned in the combustion section 6, and the flue gas flows upward through the combustion cylinder 7, is mixed with the indoor air flow from the convection blower 8 in the duct 9, is discharged as warm air, and is used for heating.

Next, the supply of liquid fuel when the power is turned on at the beginning of a season or the like will be described. First, for example, connect the equipment plug to the power outlet and turn on the power.
3 is energized. This is because the plunger 15 is gently moved upward, the power supply voltage is gradually increased so as to forcibly open the discharge valve 13 while restricting the fuel discharge, and the discharge voltage 13 is increased for a predetermined time (several tens of seconds). ) Will be retained.

That is, the discharge valve 13 is opened, and the plunger 15 remains pulled up. Accordingly, the liquid fuel in the oil supply pipe 5 and the liquid fuel in the electromagnetic pump 4 is returned by the difference in oil level from the tip of the oil supply pipe 5 to the liquid fuel in the tank 2 by the siphon principle.

After a predetermined time, the power supply is turned off. As a result, the plunger 15 is lowered to the original position, and at the same time, the discharge valve 13 is closed, and the liquid fuel in the oil feed pipe 5 is further forcibly sucked and returned through the discharge port 12a.

That is, in this embodiment, the oil level head return due to the opening of the discharge valve 13 and the return due to the suction action of the plunger 15 are combined to transfer the liquid fuel in the oil feed pipe 5 and the electromagnetic pump 4 into the tank 2. It is designed to return completely.

Therefore, the liquid fuel in the two-phase state such as the inside of the electromagnetic pump 4 is once recovered in the tank and then started to be supplied. A large amount of unburned gas, severe odor, soot and carbon monoxide can be reduced, and good combustion can be performed over a long period of time.

When the operation switch of the device is turned on to start operation, the solenoid 23 is energized and driven to start combustion as shown in the flowchart of FIG. That is, when power is supplied to the solenoid 23, the discharge valve 13 and the middle magnetic path 2 are supplied from the solenoid 23 via the upper magnetic path 24.
5, plunger 15, lower magnetic path 26 and solenoid 2
3, the discharge valve 13 rises and opens, and the plunger 15 is pulled upward.

At this time, the suction valve 16 is closed, and the liquid fuel in the space between the discharge valve seat 12 and the plunger 15 is supplied to the oil feed pipe connected to the discharge connection portion 11 through the discharge port 12a of the discharge valve seat 12. 5 is discharged. When the energization of the solenoid 23 is stopped, the discharge valve 13 is closed by the spring 14, and the plunger 15 is lowered to the original position by the springs 19 and 20. At this time, the suction valve 16 is opened to suck the liquid fuel between the discharge valve seat 12 and the plunger 15 via the lower suction pipe 21. And ON / OFF to this solenoid 23
The liquid fuel in the tank 2 is sucked from the suction pipe 21 through the filter 22 and supplied to the combustion unit 6 via the oil supply pipe 5 by repeating the OFF energization.

In the above embodiment, the oil level head difference return due to the opening of the discharge valve 13 and the return due to the suction action of the plunger 15 are combined. The head difference return alone may be used, or the oil level head difference return by opening the discharge valve 13 and the return by the suction action of the plunger 15 may be alternately and repeatedly solved, and other objects of the present invention are achieved. Any configuration may be used as long as it is within the range.

Further, in the configuration of the electromagnetic pump of the present invention, the opening of the discharge valve 13 and the vertical movement of the plunger portion 15 are performed by one solenoid 23 to simplify the configuration. A solenoid dedicated to opening or a magnetic path may be provided, and any other configuration may be used as long as the object of the present invention is achieved.

[0024]

As described above, the liquid fuel supply apparatus of the present invention eliminates the liquid fuel supply in the two-phase state where air is mixed at the beginning of the season or the like, and the liquid fuel supply apparatus is likely to be generated when the equipment is used for the first time. Large amounts of unburned gas and harsh odors,
Generation of soot and generation of carbon monoxide can be reduced, and good combustion can be performed over a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a liquid fuel supply device and an electromagnetic pump forming a main part thereof according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a hot air heater using the same device.

FIG. 3 is a block diagram showing a control unit of the apparatus.

FIG. 4 is a flowchart showing the operation of the control unit.

FIG. 5 is a sectional view of a main part of a warm air heater using a conventional fuel supply device.

FIG. 6 is a sectional view of a combustion section of a warm air heater using a conventional fuel supply device.

FIG. 7 is a sectional view of a conventional electromagnetic pump.

[Explanation of symbols]

 2 Tank 4 Electromagnetic pump 5 Oil feed pipe 6 Combustion unit 13 Discharge valve 15 Plunger 23 Solenoid 27 Pump drive control unit 28 Combustion control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 1/00 105 F23K 5/04

Claims (2)

(57) [Claims] 1. A tank for holding fuel, an electromagnetic pump for supplying fuel from the tank to a vaporizing section of a combustion section via an oil feed pipe, and energization of a solenoid of the electromagnetic pump by O.
When N, the plunger is moved up to discharge fuel and O
A pump drive control unit that drives the plunger to move down to suck the fuel when the FF is performed. The electromagnetic pump has a unit that temporarily opens the discharge valve, and the pump drive control unit is a device. A liquid fuel supply device configured to temporarily open a discharge valve when the power of the device is turned on. 2. A tank for holding fuel, an electromagnetic pump for supplying fuel from the tank to a vaporizing section of a combustion section via an oil supply pipe, and a solenoid for the electromagnetic pump being energized by O.
When N, the plunger is moved up to discharge fuel and O
A pump drive control unit for driving the plunger to descend to suck fuel when the FF is performed, wherein the electromagnetic pump includes a means for opening a discharge valve, and a pump drive control.
Part has means to gently move the plunger up
In both cases, the pump drive control unit is
Move the jar up gently to limit fuel discharge
The liquid fuel supply device is configured to temporarily move the solenoid valve in a state in which the discharge valve is opened, and then to turn off the power supply to the solenoid and rapidly return the plunger to return the fuel by a suction effect.