JP3063471B2 - 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 device for supplying fuel to an oil fan heater or the like.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional liquid fuel supply apparatus of this type is provided with an electromagnetic pump 31 in a tank 30 holding fuel, and the liquid fuel supplied to the tank 30 by the electromagnetic pump 31. Is sucked up through a suction pipe 32 and supplied to a burner section 35 through an oil supply pipe 34. The suction pipe 32 of the electromagnetic pump 31 is provided with a net-shaped filter 33 at the lower end so that dust or the like of liquid fuel is not sucked.

[0003]

However, in the above-mentioned conventional electromagnetic pump, when the fuel in the tank 30 is drained and kept empty in season off or the like, the fuel in the suction pipe 32 is replaced with air. Then, when fuel is supplied into the tank 30 and then used, there is a problem that the electromagnetic pump 31 is liable to be clogged with air and abnormal combustion is likely to occur.

[0004] For example, when the liquid fuel in the tank 30 is left in an empty state for a long period of time, for example, during initial use of the season,
In the middle of the electromagnetic pump 31, fuel and air are not replaced in the middle of an oil supply path 34 having a narrow gap such as a valve section, and fuel remains, and the suction pipe 32 is not sufficiently filled with liquid fuel. Is replaced with air.
When liquid fuel is supplied to the tank 30 by a cartridge tank or the like in such a state, when the oil level in the tank 30 rises, first, the air in the suction pipe 32 is not immediately replaced with the fuel, and Liquid fuel is mixed.
When the electromagnetic pump 31 is operated, the electromagnetic pump 31
Air and liquid fuel having different compression ratios are sucked together.

[0005] Here, if air is sucked in, for example, in a state where liquid fuel remains at the tip of the oil supply path 34, the load on the electromagnetic pump 31 is reduced, so that the force for discharging the liquid fuel is increased and the liquid fuel in the oil supply path 34 is increased. Is temporarily supplied, and then air is discharged, and the supply of liquid fuel is temporarily reduced, and becomes very unstable. Therefore, the discharge amount from the electromagnetic pump 31 becomes excessively large or small, and becomes extremely unstable and irregular. Therefore, the combustion of the burner section supplied with the unstable liquid fuel becomes too large or too small, and a large amount of unburned gas, white smoke,
There was a problem of generating carbon monoxide, odor, yellow fire, and soot.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to stabilize the discharge amount of liquid fuel by preventing the fuel in the suction pipe of an electromagnetic pump from leaking out.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an electromagnetic pump comprising: a pipe forming a flow path of liquid fuel; and a valve located at an upper portion of the pipe when discharging the liquid fuel. The liquid is sucked between the discharge part and the discharge part, which is located at the lower part and moves up and down to open the valve and closes the valve when inhaling, and closes the valve when going upward to close the valve. A plunger having therein a suction valve part for pushing up fuel, a solenoid positioned around the pipe column to move the plunger up and down, and a liquid fuel disposed below the pipe column and in a tank. A suction pipe serving as a suction path, and in the middle of the suction path including the suction pipe.
Indicates that the fuel in the suction pipe
It has a narrow part that does not fall off on the side of the door .

[0008]

According to the present invention, even when fuel in the tank is drained and held empty, such as during the off-season, fuel is applied to the narrow portion provided in the middle of the suction path of the electromagnetic pump due to surface tension. Since the fuel is kept held, the fuel in the electromagnetic pump does not come off. Therefore, even when the electromagnetic pump is driven at the start of the season, the electromagnetic pump can stably supply fuel free of air.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

2 and 3, reference numeral 1 denotes a main body case,
Reference numeral 2 denotes a tank for holding liquid fuel disposed on the side of the main body case 1, and a detachable cartridge tank 3 above the tank.
Is arranged. Reference numeral 4 denotes an electromagnetic pump disposed on the upper surface of the tank 2, reference numeral 5 denotes an oil feed pipe, and reference numeral 6 denotes a burner section for vaporizing and burning the liquid fuel sucked and supplied by the electromagnetic pump 4, and surrounding the combustion exhaust gas upward. Combustion cylinder 7 leading to
Is provided. Numeral 8 is a duct for mixing the indoor air flow from the convection blower 9 and covering the above-mentioned combustion exhaust gas with the above-mentioned combustion exhaust gas to cover the combustion tube 6 to form warm air.

Reference numeral 10 denotes an operation switch.
Is turned on, an operation start signal is sent to the combustion control unit 10A, and the power supply from the drive control unit 10B to the convection blower 8 and the electromagnetic pump 4 is controlled and operated in a predetermined sequence.

Next, the electromagnetic pump for supplying the liquid fuel will be described. In FIG. 1, reference numeral 11 denotes a pipe which forms a flow path of the liquid fuel in the electromagnetic pump 4 and has a discharge coupling portion 12 connected to the end thereof. It is a pillar. Reference numeral 13 denotes a discharge portion located at an upper portion in the pipe column 11, which discharges the liquid fuel by opening the discharge valve 14 when discharging the liquid fuel and closing the discharge valve 15 when sucking the liquid fuel. Reference numeral 16 denotes a plunger located at a lower portion of the discharge portion 13, which moves up and down, opens a suction valve 17 when going downward, sucks liquid fuel between the discharge portion 13 and a suction spring when going upward. A suction valve section 19 for closing the suction valve 17 at 18 and pushing up the liquid fuel upward is provided therein, and is supported by springs 20 and 21. Reference numeral 22 denotes a solenoid disposed around the tube post 11 for moving the plunger portion 16 up and down, transmitting magnetic lines of force from the solenoid 22 to the tube post 11 and raising the plunger portion 16 upward. A magnetic path 23 and a lower magnetic path 24 for transmitting lines of magnetic force at a distance below the magnetic path 23 are provided. 25 is the column 1
1 is a suction pipe disposed at the lower end of the suction pipe, and a narrow portion 2 is provided at the lower end thereof.
5A is formed, and a net-shaped filter 26 for filtering dust and the like so as not to enter therein is attached to the slope.

In the above configuration, the fuel is supplied from the cartridge tank 3 into the tank 2 so as to maintain a constant oil level, and the fuel is sucked up from the tank 2 to the burner section 5 by the electromagnetic pump 4. Then, the gas is burned in the burner section 5, and the flue gas flows upward through the combustion tube 6, and is mixed with the indoor air flow from the convection blower 9 in the duct 10.
It is discharged as warm air and used for heating.

The combustion control unit 10A operates based on an operation start command from the operation switch 10 to start combustion.
The drive control unit 10 according to a predetermined program
B, a combustion start command is issued, and in a predetermined sequence, the power supply to the convection blower 8 and the solenoid 22 of the electromagnetic pump 4 from the drive control unit 10B is controlled and operated to start combustion. I have.

Next, the supply of the liquid fuel will be described. When the solenoid 22 is energized, a magnetic field is generated from the solenoid 22 via the upper magnetic path 23 to the plunger portion 16, the lower magnetic path 24 and the solenoid 22, and the plunger The part 16 is pulled up. At this time, the discharge valve 14 is opened, the suction valve 17 is closed, and the liquid fuel in the space between the discharge section 13 and the plunger section 16 is discharged. When the energization of the solenoid 22 is stopped, the plunger unit 1
6 is lowered to its original position by springs 20 and 21. At this time, the discharge valve 14 is closed, the suction valve 17 is opened, and the discharge unit 13 is closed.
The liquid fuel is sucked between the piston and the plunger 16. The liquid fuel in the tank 2 is filtered by passing through the filter 26 by repeated ON / OFF of the energization of the solenoid 22, is sucked from the suction pipe 25, and is supplied to the burner section 5.

In this electromagnetic pump, even if the liquid fuel in the tank 2 is left empty for a long time during a season or the like, the fuel in the suction pipe 29 does not escape. That is, since the narrow portion 25A provided in the middle of the suction path of the suction pipe 29 is very narrow, the fuel is kept held in the narrow portion 25A by its surface tension and is in a closed state. Therefore, the fuel without the electromagnetic pump is maintained without being replaced with air. Therefore, even if the electromagnetic pump is driven at the time of the next season disclosure, no air is mixed in the electromagnetic pump, the discharge of fuel from the electromagnetic pump 4 is stabilized, and the combustion of the burner section 5 does not become abnormal. .

In the above-described embodiment, the narrow portion 25A is provided vertically at the suction port of the suction pipe 25. However, the narrow portion 25A is closed at the lower end of the suction pipe 25 to provide a horizontal suction port.
This suction port may be a narrow portion 25A. With this configuration, the effect of the fuel's own weight without the suction pipe 25 can be reduced, which is more effective.

[0018]

As described above, the liquid fuel supply apparatus of the present invention can be used for a long period of time,
By preventing the fuel in the suction pipe from leaking out, air can be prevented from being mixed in the electromagnetic pump, and the liquid fuel is stably supplied to the burner even at the start of use after a long period of non-use. And good combustion can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a liquid fuel supply device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a hot air heater using the same device.

FIG. 3 is a block diagram showing a control configuration of a hot air heater using the same device.

FIG. 4 is a sectional view of a main part of a hot air heater using a conventional liquid fuel supply device.

FIG. 5 is a sectional view of a main part of the apparatus.

[Explanation of symbols]

 2 Tank 4 Electromagnetic pump 6 Burner section 11 Tube column 13 Discharge section 16 Plunger 17 Suction valve section 22 Solenoid 25 Suction pipe 25A Narrow section

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23K 5/04 F04B 17/04

Claims (2)

(57) [Claims] 1. A tank for holding liquid fuel, and an electromagnetic pump for supplying the liquid fuel in the tank to a burner, wherein the electromagnetic pump comprises a pipe forming a flow path of the liquid fuel, and a pipe thereof. The liquid fuel is located between the discharge part, which is located at the upper part of the pillar and opens the valve when discharging liquid fuel and closes the valve when inhaling, and the lower part, which moves up and down and opens the valve when going downward to discharge the liquid fuel A plunger in which a valve is closed to push up the liquid fuel upward when the liquid is sucked and goes upward, a solenoid located around the pipe column to move the plunger up and down, and the pipe and a suction pipe is arranged below the column a path siphon liquid fuel in the tank, and on the way the suction path including the suction pipe
When the discharge is stopped, the fuel in the suction pipe
A liquid fuel supply device with a narrow part that does not fall off on the side . 2. A top Kisema隘部the liquid fuel supply device according to claim 1, wherein is positioned near the suction port.