JPH0560060A - Electromagnetic pump - Google Patents

Abstract

PURPOSE:To provide an electromagnetic pump which can improve control property of a plunger and can be driven smoothly, in relation to the electromagnetic pump for supplying fuel into a fan heater or the like. CONSTITUTION:In an electromagnetic pump 14, a solenoid 24 is constituted as multi-phase solenoid 24a to 24d which are formed by dividing the solenoid 24 into a plurality of steps in stroke direction of a plunger 21, so that the plunger 21 may be controlled forcibly by electrification of each phase of the solenoid 24. Since the plunger 21 can be moved up and down by electrification control of only the solenoid 24, it is possible to supply liquid fuel smoothly so as to improve control property sharply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump of a liquid fuel supply system for supplying fuel to an oil fan heater or the like.

[0002]

2. Description of the Related Art Conventionally, this type of electromagnetic pump has a structure as shown in FIGS. As shown in the figure,
The electromagnetic pump 1 is provided above the tank 2, sucks the liquid fuel 3 in the tank 2 and supplies it to the burner section 5 through the oil feed pipe 4, and inside the pipe column 6 that forms a flow path of the liquid fuel 3. Plunger 8 supported up and down by springs 7a and 7b provided on the upper and lower sides is moved up and down by repeating opening and closing of energization of solenoid 9, and according to the up and down movement, discharge valve 10 and suction valve 1
Opening and closing 1. Further, the vertical movement of the plunger 8 for changing the supply amount of the liquid fuel 3 is caused by the springs 7a and 7b.
Is determined by the spring characteristics such as the spring constant, the force of the solenoid 9 to be driven, and the energization time.

[0003]

However, in the above-mentioned conventional configuration, in order to make the discharge of the electromagnetic pump 1 small and smooth, the energizing time of the solenoid 9 is shortened and the frequency of vertical movement is increased. , The springs 7a, 7b resonate in accord with the natural frequency, and the stress of the springs 7a, 7b doubles to cause a surging phenomenon, and the movement of the plunger 8 becomes irregular. It fluctuates and decreases extremely. Therefore, the frequency of the plunger 8 cannot be so high, and the discharge flow rate is restricted to the upper limit of the frequency that does not cause the surging phenomenon.

Further, in a two-phase fluid state in which the liquid fuel 3 and air are mixed at the time of first use, the compressibility of gas is large,
Since the stress applied to the plunger 8 changes because it is different from the liquid fuel 3, the movement of the plunger 8 becomes large if there is air in the plunger 8 portion, and if there is fuel on the discharge side at that time, the discharge flow rate becomes excessive. Become. Further, when the fuel comes next to the plunger 8, the movement of the plunger 8 becomes the original small movement, and the air is discharged from the discharge side, so that the discharge flow rate becomes too small. In this way, in the two-phase fluid state at the time of first use, excessive and excessive discharge is repeated,
Combustion in the burner part 5 is also very unstable, and there is a problem that a large amount of soot, white smoke, carbon monoxide, unburned gas, etc. are generated with repeated strong yellow odor combustion and lift combustion. It was As a countermeasure, a method has been tried in which the solenoid 9 is divided into upper and lower two stages and alternately energized to forcibly move the plunger 8 up and down, but since the movement of the plunger 8 is not smooth, the discharge is pulsed. There was a problem that it was not smooth and it was not put to practical use.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an electromagnetic pump capable of improving the controllability of the plunger and smoothly driving it.

[0006]

In order to achieve the above-mentioned object, the present invention provides a pipe column that forms a liquid fuel flow path, a discharge portion located above the pipe column and discharging liquid fuel, and the discharge unit. A plunger located at the lower part of the section for sucking and discharging liquid fuel by vertical movement, a solenoid located around the pipe column for vertically moving the plunger, and a pump drive control section for controlling energization of the solenoid. The solenoid is provided so as to be divided into a plurality of three or more in the stroke direction of the plunger, and the pump drive control unit controls the energization of each solenoid to change the stroke of the plunger.

[0007]

With the above structure, the solenoid is divided into a plurality of parts in the stroke direction of the plunger, so that the vertical movement of the plunger can be freely and smoothly controlled by controlling the energization of each solenoid. The reciprocating cycle and stroke can be arbitrarily selected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, the same components as those shown in the above-mentioned conventional example will be described with the same reference numerals. FIG. 2 shows the structure of the combustor. That is, a removable cartridge tank 13 is provided on the upper side of the tank 2 for holding the liquid fuel provided on the side of the main body case 12.
Are arranged. The electromagnetic pump 14 is provided on the upper surface of the tank 2 and supplies liquid fuel to the burner unit 5 via the oil supply pipe 4. Around the burner portion 5, a combustion cylinder 15 that guides the combustion exhaust gas upward is provided. Reference numeral 16 is a duct that covers the combustion cylinder 15 and is arranged rearward to mix indoor air from the convection blower 17 and combustion exhaust gas to generate warm air.

FIG. 1 shows the structure of the electromagnetic pump 14. That is, 6 is a pipe column that forms a liquid fuel flow path, and the discharge coupling portion 1 that couples the oil feed pipe 4 to its tip
8 is connected. Reference numeral 19 denotes a discharge portion located above the tube column 6 and having a discharge port 19a. A discharge valve 20 made of a magnetic material is opened when the liquid fuel is discharged and is closed when the liquid fuel is sucked.
Reference numeral 21 denotes a plunger located below the discharge portion 19, which opens the suction valve 22 when moving vertically and goes downward to suck the liquid fuel between the discharge valve 19 and the suction valve 22 when moving upward. It has a suction valve portion 23 therein which closes 22 and pushes up the liquid fuel upward. Reference numeral 24 is a solenoid disposed around the pipe column 6, and is divided into upper and lower four stages of upper solenoid 24a, upper middle solenoid 24b, and lower middle solenoid 24.
c, the lower solenoid 24d has a four-phase configuration. Between the solenoid 24 and the pipe column 6, the upper solenoid 24a, the upper middle solenoid 24b, the lower middle solenoid 24c, and the upper magnetic path 25, the upper middle magnetic path 26, the middle magnetic path 27, which transmit the magnetic force lines from the lower solenoid 24d, The lower middle magnetic path 28 and the lower magnetic path 29 are arranged separately from each other. Reference numeral 30 denotes a suction pipe arranged at the lower end of the pipe column 6, and a mesh filter 31 is attached to the lower end thereof to filter dust and the like so as not to enter the inside.

FIG. 3 shows a block structure for controlling the combustor. A pump drive control unit 32, a combustion control unit 33, and a combustion control unit 33, which control the energization of the solenoid 24 of the electromagnetic pump 14, are operated by an operation switch 34. The combustion control unit 33 operates based on an operation start command from the operation switch 34, issues a combustion start command to the pump drive control unit 32 according to a predetermined program, and starts combustion. ..

To explain the operation of the above structure, first, combustion is supplied from the cartridge tank 13 into the tank 2 so as to maintain a constant oil level, and the burner is supplied from the tank 2 by the electromagnetic pump 14 via the oil feed pipe 4. It is sucked up and supplied to the part 5. Then, the burned gas is combusted in the burner portion 5, and the exhaust gas from the combustion flows to the upper side of the combustion tube 15 and the duct 16
Is mixed with the indoor air flow from the convection blower 17 and discharged as warm air for heating.

Explaining the supply of fuel, the plunger 21 that moves up and down by energization of the solenoid 24 will be described.
, The discharge valve 20 is opened, the suction valve 22 is closed, and the liquid fuel in the space between the discharge part 19 and the plunger 21 is discharged to the discharge coupling part 18 via the discharge port 19a of the discharge part 19. The oil is discharged to the connected oil supply pipe 4. Further, when the plunger 21 goes downward, the discharge valve 20 is closed and the suction valve 22 is opened, and the space between the discharge portion 19 and the plunger 21 is filled with the liquid fuel sucked from the suction pipe 30 below. By repeating the vertical movement of the plunger 21, the liquid fuel in the tank 2 passes through the filter 31, is filtered, is sucked from the suction pipe 30, and is supplied to the burner unit 5 via the oil supply pipe 4. ..

Now, the energization control of each solenoid by the pump drive controller 32, that is, the energization of the solenoid 24 for moving the plunger 21 up and down will be described.
For example, first, in the first step, the upper solenoid 24a is energized to move the plunger 21 to the uppermost position, and then, in the second step, the upper middle solenoid 24b is energized to reach about 1 / about the uppermost position.
3 position, and in the third step the lower middle solenoid 24
Energize c to the 2/3 position, and in the fourth step energize the lower solenoid 24d to the lowest position.
Position and lower the plunger 21 from the uppermost position to the lowermost position. Further, by performing this operation in reverse from the fourth step to the first step, the plunger 21 can be raised from the lowermost position to the uppermost position. That is, by controlling the repetition of these energizations by the pump drive control unit 32, the plunger 21 can be moved up and down, its reciprocating cycle can be arbitrarily changed, and its stroke can be changed to, for example, each solenoid. It can be set freely by selecting energization.

Further, in the electromagnetic pump of this embodiment, the upper and lower 4
Each solenoid 24a, 24b, 24c, 2 divided into stages
Since 4d is provided and has a four-phase configuration, it is possible not only to move the plunger 21 up and down but also to make the movement smooth by controlling the energization of each solenoid.

As described above, since the plunger 21 can be driven only by controlling the energization of each solenoid, the spring for the vertical movement of the plunger 21 is unnecessary, and it is not necessary to consider the influence of the surging phenomenon and the like. The electromagnetic pump 1
The discharge of the liquid fuel from No. 4 can be made smooth, and the discharge flow rate can be greatly increased.

Further, since the spring for vertically moving the plunger 21 is not used, the force for moving the plunger 21 up and down may be small, and the solenoid 24 can be made smaller by that amount, and the small size and large flow rate characteristics can be obtained. Plunger 2
Since the stroke of 1 is also stable, it is possible to prevent the flow rate from becoming excessive even in a two-phase flow state where liquid and air are mixed, such as at the time of first use, soot with strong odor due to yellow fire combustion, Generation of carbon monoxide, unburned gas, etc. can be reduced.

Further, since the vertical stroke of the plunger 24 can be set in multiple stages, it is usually possible to reduce the stroke and increase the stroke only at the time of the first charging to increase the suction force at the first time and increase the suction lift. it can.

In the present embodiment, the energization of the solenoid 24 is controlled by sequentially energizing each phase independently, but this may energize multiple phases at the same time. It should move smoothly. Further, in this embodiment, the spring for supporting the plunger 24 up and down is eliminated, but this may be provided with an extremely weak spring for the initial positioning of the plunger 21 as long as the surging phenomenon does not occur in the range of use. Good.

[0019]

As is apparent from the above-described embodiments, the electromagnetic pump of the present invention includes a pipe column forming a liquid fuel flow passage,
2 is a discharge part located above the pipe column for discharging liquid fuel, a plunger located under the discharge part for sucking and discharging liquid fuel by vertical movement, and a plunger located around the pipe column. A solenoid that moves up and down and a pump drive control unit that controls energization of the solenoid are provided.The solenoid is provided by dividing the solenoid into three or more in the stroke direction of the plunger. The energization is controlled to change the stroke of the plunger. With this configuration, the reciprocating cycle of the plunger or its stroke can be freely and smoothly driven and controlled.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic pump according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a warm air heater using the electromagnetic pump.

FIG. 3 is a control block diagram of the electromagnetic pump.

FIG. 4 is a vertical cross-sectional view of a warm air heater using a conventional electromagnetic pump.

FIG. 5 is a sectional view of the same electromagnetic pump.

[Explanation of symbols]

 6 Pipe Column 14 Electromagnetic Pump 19 Discharge Section 21 Plunger 24 Solenoid 32 Pump Drive Control Section

Claims (1)

[Claims] 1. A pipe column that forms a liquid fuel flow path, a discharge unit that is located above the pipe column and discharges liquid fuel, and a discharge unit that is located below this discharge unit and that vertically moves to suck and discharge the liquid fuel. It is provided with a plunger, a solenoid that is located around the pipe column and moves the plunger up and down, and a pump drive control unit that controls energization of the solenoid, and the solenoid has three or more in the stroke direction of the plunger. An electromagnetic pump configured to be divided into a plurality of parts and configured to change the stroke of the plunger by controlling energization of each solenoid by a pump drive control unit.