JPH04327712A - Liquid fuel supply device and its electromagnetic pump - Google Patents

Abstract

PURPOSE:To reduce unpleasant odor that is liable to be created at the time of fire extinction or ignition and the formation of tar for a liquid fuel supply device and an electromagnetic pump. CONSTITUTION:These liquid fuel supply device and electromagnetic pump constitute the discharge valve 13 provided in the fuel flow channel of a magnetic body and a discharge solenoid 15 that opens and closes forcibly the discharge valve 13 is provided in the surrounding of the discharge valve 13. When the electromagnetic pump is stopped or at the time of ignition the discharge valve 13 is opened for a certain time (a few seconds) to return the liquid fuel in the fuel transportation pipe 5 and nozzle to the electromagnetic pump 4 or tank 2. Therefore, the case in which the increase in the fuel corresponding to the thermal expansion of the fuel transportation pipe 5 and nozzle that develops at the time when the electromagnetic pump is stopped or ignition is made is supplied to the combustion section and unpleasant odor is issued and tar is formed is eliminated.

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 a combustion section of a kerosene fan heater, etc., and an electromagnetic pump thereof.

0002

[Prior Art] A conventional liquid fuel supply device of this type is shown in FIG.
As shown in the figure, an electromagnetic pump 102 is disposed above a tank 101 holding liquid fuel, and the electromagnetic pump 102 sucks up the liquid fuel in the tank 101 and supplies it to a combustion section 104 via an oil pipe 103 for combustion. It has become.

As shown in FIG. 8, the electromagnetic pump drives a discharge valve 106 and a suction valve 107 in accordance with the vertical movement of a plunger 105 to suck fuel from a tank 101 and supply it to a combustion section 104. ing.

0004

[Problems to be Solved by the Invention] However, in the conventional configuration described above, the electromagnetic pump 102
Even when the electromagnetic pump 102 is stopped, the liquid fuel supplied to the combustion section 104 via the fuel pipe 103 or connected thereto faces the inside of the vaporization section 108 of the combustion section 104 as shown in FIG. The amount of oil expanded due to the rise in temperature of the nozzle 109 and the like is supplied to the combustion section 104.

For example, during combustion, the oil pipe 103 and nozzle 109 near the combustion section 104 are also at a high temperature.
The oil pipe 103 and nozzle 109 are cooled by the liquid fuel in the tank 101 that is drawn up and supplied by the electromagnetic pump 102 . However, when combustion is stopped and the supply of liquid fuel is stopped, the cooling effect of this liquid fuel disappears, the temperature of the liquid fuel rises in the oil pipe 103 and the nozzle 109, and the amount of expanded oil flows slightly into the combustion section 104. Supplied late. The amount of expansion oil supplied is
It is vaporized in the vaporization section 108 of the combustion section 104, causing a large amount of unburned gas, a strong odor, and the formation of tar.

[0006] The same goes for ignition, and the liquid fuel in the oil pipe 103 and nozzle 109 expands due to the temperature rise in the combustion section 104 before starting ignition, and is vaporized in the vaporization section 108 of the combustion section 104, resulting in a large amount of unused fuel. It causes combustion gas, strong odor, and tar formation.

[0007] This phenomenon becomes conspicuous when the temperature of the oil feed pipe 103 and nozzle 109 increases the most immediately after the electromagnetic pump stops, and causes discomfort to the user.

The present invention has been made to solve the above-mentioned problems, and aims to reduce odor and tar production by eliminating unnecessary supply of liquid fuel before ignition and after extinguishing.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a tank that holds fuel, an electromagnetic pump that supplies fuel from the tank to a combustion section, and a pump drive that controls the drive of the electromagnetic pump. The electromagnetic pump has a discharge valve made of a magnetic material and a discharge solenoid for driving the discharge valve, and the pump drive control section temporarily energizes the discharge solenoid when the fuel supply is stopped. A configuration in which a discharge valve is driven to open, or a tank holding fuel, an electromagnetic pump that supplies fuel from the tank to the vaporization part of the combustion part, a pump drive control part that controls the drive of the electromagnetic pump, and the The electromagnetic pump is equipped with a combustion control section that outputs a combustion start command to burn the vaporized gas vaporized in the vaporization section and controls the vaporization section to be heated to a predetermined temperature before the combustion start command, and the electromagnetic pump has a discharge valve that is magnetized. A discharge solenoid is formed in the body and drives the discharge valve, and the pump drive control section temporarily energizes the discharge solenoid and drives the discharge valve to open it before the combustion control section commands the start of combustion. The electromagnetic pump has a pipe column that forms a flow path for liquid fuel, a discharge valve located at the top of the pipe column that opens when discharging liquid fuel and closes when inhaling liquid fuel, and a discharge valve located below the column that forms a flow path for liquid fuel. A plunger that sucks and discharges fuel, a solenoid that is located around the tube column and moves the plunger up and down, and a suction pipe that is disposed below the tube column and serves as a path for sucking up liquid fuel in the tank. The discharge valve is made of a magnetic material, and a discharge solenoid is disposed around the discharge valve for at least forcibly opening the discharge valve.

0010

[Operation] According to the above-mentioned structure of the present invention, the expanded oil amount of the liquid fuel caused by the rise in temperature of the oil pipe or nozzle at the time of ignition or extinguishing is recovered into the electromagnetic pump or tank by opening the discharge valve in the electromagnetic pump. As a result, unnecessary liquid fuel is no longer supplied to the combustion section, and problems such as the generation of a large amount of unburned gas, strong odor, and tar generated when the expanded oil amount is vaporized in the combustion section are eliminated.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings. First, in FIG. 2, 1 is a main body case, 2 is a tank holding liquid fuel disposed on the side of the main body case 1, and a removable cartridge tank 3 is disposed above the tank. 4 is an electromagnetic pump arranged on the top surface of tank 2; 6
is a combustion section that vaporizes and burns the liquid fuel sucked up by the electromagnetic pump 4 and supplied via the oil supply pipe 5, and has the same structure as the conventional one shown in FIG. A combustion tube 7 leading upward is provided. Reference numeral 9 denotes a convection blower 8 that covers the combustion tube 7 and is arranged at the rear.
This duct mixes the indoor airflow from the combustion chamber with the above-mentioned combustion exhaust gas to produce warm air.

Next, the electromagnetic pump that supplies liquid fuel will be explained. In FIG. 1, 10 is the electromagnetic pump 4.
It is a pipe column that forms a liquid fuel flow path therein, and a discharge coupling part 11 to which an oil feed pipe 5 is coupled is connected to the tip of the pipe column. Reference numeral 12 denotes a discharge valve provided within the discharge joint 11, and has a discharge port 12a. A discharge valve 13 opens and closes the discharge port 12a, and is made of a magnetic material, and is opened when liquid fuel is discharged and closed by a discharge spring 14 when it is sucked. Reference numeral 15 denotes a discharge solenoid disposed around the discharge joint 11 in the vicinity of the discharge valve 13, which opens and closes the discharge valve 13, and transmits the line of magnetic force from the discharge solenoid 15 between it and the discharge joint 11 to discharge. An upper discharge magnetic path 16 for lifting the valve 13 upward to open it, and a lower discharge magnetic path 17 for transmitting lines of magnetic force at a distance below the upper magnetic path 16 are arranged.

Reference numeral 18 denotes a plunger located at the bottom of the discharge valve seat 12, which moves up and down, and when moving downward, it pushes the suction valve 1.
It has a suction valve part 21 therein which opens the suction valve 9 to suck liquid fuel between it and the discharge valve seat 12, and closes the suction valve 19 with a suction spring 20 when moving upward to push the liquid fuel upward. It is supported by springs 22 and 23. 24 is a solenoid disposed around the tube column 10, and the plunger 1
8 is moved up and down, and has an upper magnetic path 25 which transmits the lines of magnetic force from the solenoid 24 between the tube column 10 and pulls up the plunger part 18, and a lower magnetic path 26 which is separated from the lower part and transmits the lines of magnetic force. It is set up. 27 is the above tube column 10
A suction pipe is installed at the lower end, and there is a mesh filter 28 at the lower end that filters out dirt and other debris to prevent it from entering.
is installed.

Reference numeral 30 denotes a pump drive control section that controls the energization of the discharge solenoid 15 and the solenoid 24 for the plunger 18, and as shown in FIG. 3, it operates in response to the output from the combustion control section 31. ing. The combustion control section 31 operates based on an operation start command from the operation switch 32, and issues a combustion start command to the pump drive control section 30 according to a predetermined program to start combustion. .

In the above configuration, fuel is first supplied from the cartridge tank 3 into the tank 2 so as to maintain a constant oil level, and then sucked up from the tank 2 by the electromagnetic pump 4 through the oil pipe 5 to the combustion section 6. Supplied. The combustion exhaust gas is then combusted in the combustion section 6, flows upward into the combustion tube 7, is mixed with the indoor air flow from the convection blower 8 in the duct 9, and is discharged as warm air to be used for heating.

Next, the supply of liquid fuel will be explained.
When a combustion start command is issued from the combustion control section 31, the plunger solenoid 24 is energized and driven to start combustion as shown in the flowchart of FIG. That is, when the solenoid 24 is energized, a magnetic field is generated from the solenoid 24 through the upper magnetic path 25 to the plunger 18, the lower magnetic path 26, and the solenoid 24, and the plunger 18 is pulled upward. At this time, the discharge valve 13 was opened, the suction valve 19 was closed, and the liquid fuel in the space between the discharge valve seat 12 and the plunger 18 was coupled to the discharge joint 11 via the discharge port 12a of the discharge valve seat 12. The oil is discharged to the oil pipe 5. When the solenoid 24 is de-energized, the plunger 18 is lowered to its original position by the springs 22 and 23. At this time, the discharge valve 13 is closed, the suction valve 19 is opened, and the space between the discharge valve seat 12 and the plunger 18 is filled with liquid fuel sucked from the suction pipe 27 below. By repeating the ON/OFF energization of the solenoid 24, the liquid fuel in the tank 2 passes through the filter 28, is sucked in from the suction pipe 27, and is supplied to the combustion section 6 via the oil pipe 5.

Next, when there is a command to stop combustion, the plunger solenoid 24 is de-energized, and at the same time the discharge solenoid 15 is energized for a predetermined period of time (several seconds) to close the discharge valve 1.
Open 3. That is, the discharge solenoid 15 is energized for a certain period of time (several seconds) to generate a magnetic field from the discharge solenoid 15 through the discharge upper magnetic path 16 to the discharge valve 13, the discharge lower magnetic path 17, and the discharge solenoid 15. It is pulled upward and opened, and the liquid fuel in the oil pipe 5 is returned to the electromagnetic pump 4 or the tank 2 in an amount greater than the amount of expanded oil. In other words, when the plunger 18 moves downward when stopped, the discharge valve 13 is opened, so the discharge port 1
The liquid fuel in the oil supply pipe 5 is sucked through the oil supply pipe 2a, and the liquid fuel is returned from the tip of the oil supply pipe 5 by the difference in oil level of the liquid fuel in the tank 2 based on the siphon principle.

Therefore, when combustion is stopped, the expanded oil amount of the liquid fuel caused by the temperature rise of the oil pipe 5 and nozzle is not supplied to the combustion section 6, and a large amount of unburned gas, strong odor, and tar are generated. Defects such as generation can be reduced, and good combustion can be achieved over a long period of time.

FIG. 5 solves the problem at the time of ignition, and is structurally the same as the one already explained, but since the operations of the combustion control section 31 and the pump drive control section 30 are different, the flowchart in the same figure is different from the one described above. I will explain using

First, when a combustion start command is issued, the combustion control section 31 sends it to the pump drive control section 30, and the pump drive control section 31 energizes the discharge solenoid 15 for a predetermined period of time (several seconds) to open the discharge valve 13. Thereafter, the combustion control section 31 starts heating the vaporization section, and when the vaporization section reaches a predetermined temperature, the plunger solenoid 24 is energized to start combustion.

Here, even if the temperature of the vaporization section rises and the temperature of the oil pipe 5 and nozzle rises, the fuel inside these nozzles, etc. will return to the electromagnetic pump 4 and tank 2 as in the example explained earlier. Since it does not bulge into the combustion section 6, defects such as generation of a large amount of unburned gas, strong odor, and tar formation can be reduced, and good combustion can be carried out over a long period of time. .

[0022] In the above explanation, the problem of ignition and extinguishing are solved separately, but they may be combined to solve both the problems of ignition and extinguishing at the same time. Any other configuration may be used as long as the object of the present invention is achieved.

[0023]

Effects of the Invention As explained above, the liquid fuel supply device of the present invention and its electromagnetic pump collect the liquid fuel in the oil pipe or the like into the electromagnetic pump or tank at the time of ignition or extinguishing, This eliminates the supply of unnecessary liquid fuel to the combustion section, which is caused by the rise in temperature of the oil pipe and nozzle when the electromagnetic pump is stopped after a fire has been extinguished, and reduces the large amount of liquid fuel that is generated when the expanded oil volume of the unnecessary liquid fuel is vaporized in the combustion section. It is possible to reduce the discomfort caused to the user, such as the generation of unburned gas and the strong odor, and also to reduce the generation of tar, allowing for good combustion over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a liquid fuel supply device and an electromagnetic pump which is a main part thereof in 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 section of the device.

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

FIG. 5 is a flowchart showing the operation of another example of the control unit.

FIG. 6 is a sectional view of a main part of a hot air heater using a conventional fuel supply device.

FIG. 7 is a sectional view of a combustion section according to the conventional method and the present invention.

FIG. 8 is a sectional view of a conventional electromagnetic pump.

[Explanation of symbols]

2 Tank 4 Electromagnetic pump 5 Oil pipe 6　Combustion part 10 Pipe column 13 Discharge valve 15 Discharge solenoid 18 Plunger 16 Suction valve 24 Plunger solenoid 27 Suction pipe 30 Pump drive control section 31 Combustion control section

Claims (3)

[Claims] 1. A tank that holds fuel, an electromagnetic pump that supplies fuel from the tank to a combustion section, and a pump drive control section that controls the drive of the electromagnetic pump, the electromagnetic pump having a discharge valve. A liquid fuel supply device comprising a discharge solenoid formed of a magnetic material and driving the discharge valve, and wherein the pump drive control section temporarily energizes the discharge solenoid to drive the discharge valve to open the discharge valve when the fuel supply is stopped. Device. 2. A tank that holds fuel, an electromagnetic pump that supplies fuel from the tank to a vaporization section of a combustion section, a pump drive control section that controls driving of the electromagnetic pump, and a fuel tank that supplies fuel that is vaporized in the vaporization section. The electromagnetic pump includes a combustion control unit that outputs a combustion start command to combust the gas and controls the vaporizer to be heated to a predetermined temperature before the combustion start command, and the electromagnetic pump has a discharge valve made of a magnetic material and a combustion control unit that outputs a combustion start command to combust the gas. A liquid fuel supply device comprising a discharge solenoid for driving a discharge valve, and wherein the pump drive control section temporarily energizes the discharge solenoid to drive the discharge valve to open the discharge valve before a combustion start command is issued by the combustion control section. 3. A pipe column forming a flow path for liquid fuel, a discharge valve located at the top of the pipe column that opens when discharging liquid fuel and closes when inhaling liquid fuel, and a discharge valve located below the column and discharging liquid fuel by vertical movement. A plunger for sucking and discharging, a solenoid located around the tube column to move the plunger up and down, and a suction pipe disposed below the tube column and serving as a path for sucking up liquid fuel in the tank, and an electromagnetic pump in which the discharge valve is made of a magnetic material, and a discharge solenoid is disposed around the discharge valve for at least forcibly opening the discharge valve.