JPH03105110A - Liquid fuel supplier - Google Patents

Abstract

PURPOSE:To carry out oil quantity detection with high accuracy over a long period by providing an electromagnetic plunger pump with a filter which covers the suction section and its surrounding area and providing a liquid fuel level detection device between the suction section and the filter. CONSTITUTION:By the up-and-down motion of the plunger section caused by the repeated ON and OFF of engergizing through a solenoid 12 the liquid fuel in the tank 18 goes through a filter 17 and is filtered, then it is sucked from the inlet 15b of the suction section 15 and its discharge and suction are repeated, and the liquid fuel is supplied to a liquid fuel burner, etc. And, a float switch 16 operates when the liquid fuel disappears and its level descends and a float 16a goes down to some extent with the fuel disappearance and the fall of the level, and the float switch 16 sends signal to stop the repeated ON and OFF of solenoid 12 energizing. Even if the level of the liquid fuel varies by the location of the installation or by the vibration of the device itself, it is buffered by the filter 17, and for the float switch 16 a wrong action is hard, and the level of the liquid fuel can be detected with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid fuel supply device for supplying liquid fuel to a liquid fuel combustion device such as an oil-fired heater.

2. Description of the Related Art A conventional liquid fuel supply device will be described below with reference to the drawings.

In FIG. 2, reference numeral 19 denotes a pipe column that forms a flow path for the liquid fuel, and a discharge valve 20 located at the upper part of the pipe column 19 that opens when discharging liquid fuel and closes it when inhaling the liquid fuel, and a discharge spring 2l. part and the plunger part 2 located below it.
It has 3. The plunger section 23 moves up and down, opens the suction valve 22 to suck liquid fuel between it and the discharge valve 20 when moving downward, and closes the suction valve 22 when moving upward to push the liquid fuel upward. It has a suction valve section therein, and is supported at the top and bottom by springs 24 and 25. 26 is a solenoid that moves the plunger portion 23 up and down around the tube column 19;
An upper magnetic path 27 that transmits the lines of magnetic force from the upper magnetic field and pulls the plunger portion 23 upward, and a lower magnetic path 28 that is separated from the upper magnetic path 27 and transmits the lines of magnetic force below the upper magnetic path 27 are disposed. Reference numeral 29 denotes a suction section disposed at the lower part of the tube column 19, and a filter 29a is provided only around the lower portion, and the lower portion is immersed in the liquid fuel in the tank 31. 30 is a float switch that detects the level of the liquid fuel in the tank 31 using a flow rate 30a. In the above structure, when the solenoid 26 is energized,
A magnetic field is generated from the solenoid 26 through the upper magnetic path 27 to the brunge + portion 23, the lower magnetic path 28, and the solenoid 26, and the plunger portion 23 is pulled upward. At this time, the discharge valve 21 is opened, the suction valve 22 is closed, and the liquid fuel in the space between the discharge part and the plunger part 23 is discharged from the outlet 32. When the solenoid 26 is de-energized, the plunger portion 23 is lowered downward to its original position by the springs 24 and 25. At this time, the discharge valve 21 is closed, the suction valve 22 is opened, and liquid fuel is sucked between the discharge part and the plunger part 23 from the suction port 33. Then, by repeating the ON and OFF energization of the solenoid 26 described above, the plunger section 23 moves up and down to repeat discharge and suction, and the liquid fuel in the tank 31 is supplied to a combustion device and the like.

Furthermore, when the liquid fuel in the tank 31 becomes low, the float switch 30 is activated, the energization of the solenoid 26 is stopped, and the supply to the combustion device and the like is stopped.

Problems to be Solved by the Invention However, the above conventional structure has the following problems. That is, there is a problem in that the float 30a is likely to shake and malfunction due to fluctuations in the oil level of the liquid fuel due to the installation location or vibrations of the device itself.

Furthermore, if the liquid fuel supplied into the tank 31 is mixed with impurities such as dust, the movement of the float 30a of the float switch 30 will be poor, and the accuracy of the liquid fuel level detection of the float switch 30 will vary, causing a malfunction. There was also the issue of making it easier.

The present invention solves these conventional problems by detecting the amount of liquid fuel between the suction part of the electromagnetic plunger pump and the filter that surrounds it, thereby preventing erroneous oil level detection due to fluctuations in the oil level. The purpose is to reduce operation and to accurately detect oil level over a long period of time.

Means for Solving the Problems In order to solve the above problems, the electromagnetic plunger pump of the present invention has a filter disposed around the suction part, and liquid fuel oil such as a float switch is provided between the suction part and the filter. A surface detection means is provided.

Effect of the present invention Due to the above-mentioned precautions, fluctuations in the oil level of liquid fuel due to vibrations at the installation location are absorbed by the filter, reducing its influence, and impurities such as dust contained in the liquid fuel are also removed. Fuel level detection will become more accurate.

Furthermore, as the filtration area becomes larger and the liquid fuel passage speed becomes slower, the life of the filter due to the adhesion of dirt and other impurities is also significantly extended. EXAMPLE An example of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a tube column that forms a liquid fuel flow path and is connected to a discharge coupling section 2 at its tip. Reference numeral 3 denotes a discharge valve portion located at the upper part of the tube column 1, which opens the discharge valve 4 when discharging liquid fuel, and closes it with a discharge spring 5 during suction to discharge the liquid fuel.

Reference numeral 6 is located at the lower part of the discharge valve part 3 and moves up and down. When going downward, the suction valve 7 is opened and liquid fuel is sucked between it and the discharge valve part 3. When going upward, the suction valve 7 is opened by the suction spring 8. It has an inlet valve part 9 therein which closes the valve and pushes the liquid fuel upward, and is a plunger part supported by springs IO and 11 at the top and bottom. Reference numeral 12 denotes a solenoid that moves the plunger section 6 up and down around the tube column 1, and an upper magnetic path 13 that transmits magnetic lines of force from the solenoid 12 and pulls the plunger section 6 upwards between it and the tube column l; A lower magnetic path l4 is disposed apart from the lower portion to transmit lines of magnetic force and has a threaded portion on its outer periphery.

Reference numeral 15 denotes a suction section for a vibrator or the like arranged at the lower part of the tube column 1, and a mesh filter 15a is disposed at the lower end thereof, and the lower part of the suction section 5 is immersed in liquid fuel. 16
A float switch is disposed on the side of the suction portion 15 and detects the oil level height using a float 16a. Reference numeral 17 denotes a sponge-like filter that covers the suction portion L5 and the float sinch 16 from below and filters liquid fuel. Reference numeral 18 denotes a tank to which an electromagnetic plunger bomb is attached and which holds liquid fuel inside.

In the above-described if, when the solenoid 12 is energized,
A magnetic field is generated from the solenoid l2 through the upper magnetic path 13 to the plunger portion 6, the lower magnetic path 14, and the solenoid 12, and the plunger portion 6 is pulled upward. At this time, the discharge valve 4 is opened, the suction valve 7 is closed, and the liquid fuel in the space between the discharge valve part 3 and the plunger part 6 is discharged from the outlet 2b.
Discharge more. Further, when the solenoid 12 is de-energized, the plunger portion 6 is lowered to its original position by the springs 10 and 11.

At this time, the discharge valve 4 is closed, the suction valve 7 is opened, and liquid fuel is sucked between the discharge valve part 3 and the plunger part 6. Then, the above-mentioned solenoid 12 is turned on and off.
By repeatedly moving the plunger section 6 up and down, the liquid fuel in the tank I8 passes through the filter 17, is filtered, is sucked in from the inlet 15b of the suction section 15, and is repeatedly discharged and inhaled. The fuel is then supplied to liquid fuel combustion equipment and the like. In addition, the float switch 16
is activated when the liquid fuel runs out and the oil level drops, and the float 16a goes down to a certain extent, and the solenoid 12
A signal is sent to stop the repeated ON and OFF energization.

Even if the level of the liquid fuel fluctuates due to the installation location or vibrations of the device itself, this is buffered by the filter 17, making it difficult for the float switch 16 to malfunction. In addition, since the liquid fuel around the float switch l6 is filtered by the filter 17, impurities such as dust are also removed, making it less likely to be affected by such impurities, and the oil level of the liquid fuel can be detected with high accuracy. Furthermore, since the filtration area of the filter 17 becomes larger and the liquid fuel passage speed becomes slower, the life of the filter 17 itself due to adhesion of impurities such as dust becomes significantly longer.

Therefore, liquid fuel exhaustion can be detected with high accuracy over a long period of time.

Effects of the Invention As described above, according to the present invention, liquid fuel exhaustion can be accurately detected over a long period of time without being affected by vibrations of the combustion device, etc., and the effect is significant.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a liquid fuel supply apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a liquid fuel supply apparatus according to a conventional embodiment. 1... Pipe column, 6... Plunger part,
l2...Solenoid, l5...Suction part, 16...Liquid fuel oil level detection means (float switch), 17...Filter 18...・
·tank.

Claims (2)

[Claims] (1) A pipe column that forms a flow path for liquid fuel, a discharge valve section located in the upper part of the pipe column that opens the valve when discharging liquid fuel and closes the valve when inhaling liquid fuel, and a discharge valve section located at the bottom of the discharge valve section. a plunger part having therein a suction valve part that opens a valve to suck liquid fuel between it and a discharge valve when moving up and down and goes downward, and closes the valve when going upward and pushes liquid fuel upward; A solenoid is provided around the pipe pillar to move the plunger part up and down, and a suction part is provided below the pipe pillar and serves as a path for sucking up the liquid fuel in the tank, and the suction part is covered around the suction part. A liquid fuel supply device comprising a filter arranged in the same manner as the filter, and a liquid fuel oil level detection means provided between the suction part and the filter. (2) The liquid fuel supply device according to claim 1, wherein the liquid fuel level detection means is a float switch that detects the level of the liquid fuel using a float.