JP2629993B2 - Liquid fuel supply device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid fuel supply device for supplying fuel to a petroleum fan heater or the like.

2. Description of the Related Art As shown in FIG. 5, a conventional liquid fuel supply apparatus of this type is provided with an electromagnetic pump in a fixed tank holding fuel, and sucks up the fuel in the fixed tank by this electromagnetic pump to convert the fuel into a burner section (not shown). ). A cylindrical filter is fitted into the suction pipe of the electromagnetic pump so that dust in the fuel is not sucked.

Problems to be Solved by the Invention However, in the above-described conventional configuration, there is a problem that the electromagnetic pump 31 is likely to bite the air and easily cause abnormal combustion. For example, at the time of initial use in which the liquid fuel in the fixed tank 29 is left empty for a long time, the fuel supply system of the electromagnetic pump 31 is not sufficiently filled with fuel, and the air is replaced. I have. In such a state, when liquid fuel is supplied to the fixed tank 29 by a cartridge tank or the like, when the oil level in the fixed tank 29 rises, the fuel flowing in the pores of the filter 48 and the air flowing out are formed. An oil film is formed between them, and the air permeability thereof is reduced, so that air bubbles accumulate in the air of the suction pipe 47 and the air of the filter 48, and the air and the liquid fuel are mixed. And when the electromagnetic pump 31 is operated here,
Since air and liquid fuel having different compression ratios and the like are mixed and sucked into the electromagnetic pump 31, the discharge amount from the electromagnetic pump becomes excessively large or small, and becomes extremely unstable. As a result, the combustion of the burner section supplied with this unstable liquid fuel becomes excessively large or small, and a large amount of unburned gas, white smoke, carbon monoxide, odor, yellow fire, soot, etc. There is a problem that occurs.

However, if the filter 48 is abolished for this reason, if impurities such as dirt are mixed in the liquid fuel supplied to the fixed tank 29, the driving part in the electromagnetic pump 31 such as the plunger of the electromagnetic pump 31 may become dusty. pump
There was also a problem of deteriorating the performance of 31 itself.

An object of the present invention is to solve such a conventional problem and to make it possible to use an electromagnetic pump with high accuracy over a long period of time.

Means for Solving the Problems In order to achieve the above object, the present invention provides a bypass passage having a tapered notch having a wide lower part and a narrow upper part in a part of a fitting portion between a suction pipe and a filter of an electromagnetic pump. Is provided.

According to the present invention, the above configuration makes it easy to bleed air from the space between the suction pipe and the filter, so that the electromagnetic pump sucks liquid fuel in a state where air is not mixed without sucking dust. When a sintered filter with a high filter effect is fitted to the suction pipe, shavings are not generated at the inverted tapered notch, so that the electromagnetic pump can be used accurately for a long time. become.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 3 and 4, reference numeral 1 denotes a main body case, and 2 denotes a fixed tank provided on a side portion of the main body case 1 for holding a liquid fuel, and a detachable cartridge tank 3 is disposed above the fixed tank. . Reference numeral 5 denotes a burner section for vaporizing and burning the liquid fuel sucked and supplied by the electromagnetic pump 4, and a combustion cylinder 6 for guiding combustion exhaust gas upward is provided around the burner section. Numeral 10 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 and to produce hot air.

Next, the supply means for supplying the liquid fuel will be described. In FIGS. 1 and 2, a pipe 11 forms a flow path of the liquid fuel in the electromagnetic pump 4 and has a discharge coupling portion 12 connected to the tip thereof. It is a pillar. Reference numeral 13 denotes a discharge valve portion located at an upper portion in the pipe post 11, which opens the discharge valve 14 when discharging the liquid fuel, and closes by the discharge spring 15 when discharging to discharge the liquid fuel.
Reference numeral 16 denotes a plunger located at a lower portion of the discharge valve portion. The plunger moves up and down to open a suction valve 17 when going downward to suck liquid fuel between the discharge valve 3 and a suction spring 18 when going upward. To close the suction valve 17 and push up the liquid fuel upward
It has a 19 in it and is supported by springs 20,21. Reference numeral 22 denotes a solenoid disposed around the pipe column 11 for moving the plunger 16 up and down.
An upper magnetic path 23 for transmitting the magnetic force lines from the solenoid 22 to pull up the plunger portion 16 upward, and a lower magnetic path 24 having a threaded part for transmitting the magnetic force lines to the lower part and transmitting the magnetic force lines to the lower part thereof. . 25 is a suction pipe arranged at the lower part of the pipe column, and has a plurality of ribs 25A in the longitudinal direction around the lower part,
A radial ring-shaped fitting portion 25B is provided at an appropriate position in the longitudinal direction. A part of the fitting portion 25B is formed with a tapered notch 25C having a wide lower part and a narrow upper part upward from a lower contact point with the rib 25A. 26 is a cylindrical filter fitted from below into the fitting part of the suction pipe 25,
It is constituted by sintering resin particles. Reference numeral 27 denotes a float switch for detecting the oil level of the liquid fuel in the fixed tank 2 by a float 27A.

In the above-described configuration, the fuel is supplied from the cartridge tank 3 into the fixed tank 2 so as to maintain a constant oil level, and the fuel is sucked from the fixed tank 2 to the burner unit 5 by the electromagnetic pump 4. Then, the combustion exhaust gas which is burned in the burner section 5 flows above the combustion cylinder 6, is mixed with the room air flow from the convection blower 9 in the duct 10, is discharged as warm air, and is used for heating.

In addition, the supply of liquid fuel will be described.
When power is supplied to the solenoid 22, a magnetic field is generated from the solenoid 22 through the upper magnetic path 23 to the plunger section 16, the lower magnetic path 24, and the solenoid 22, and the plunger section 16 is pulled upward. 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 16 is lowered to the original position by the springs 20 and 21.
At this time, the discharge valve 14 is closed, the suction valve 17 is opened, and the discharge unit 13
The liquid fuel is sucked between the piston and the plunger section 16. The liquid fuel in the tank 2 is filtered through the filter 26 and is sucked from the suction pipe 25 by repeating ON / OFF of the energization of the solenoid 22, and is sucked from the burner unit 5.
Supplied to

Here, in the state where the liquid fuel in the fixed tank 2 is left empty for a long time at the time of initial use or the like and the oil supply system of the electromagnetic pump 4 is not sufficiently filled with fuel and the air is replaced, When liquid fuel is supplied from the cartridge tank 3 to the tank 2, when the oil level in the fixed tank 2 rises,
Bubbles generated in the space between the suction pipe 25 and the filter 26 escape upward from the tapered notch 25C having a wide lower portion and a narrow upper portion provided in the fitting portion 25B of the suction pipe 25. Therefore, the space between the suction pipe 25 and the filter 26 is filled only with the liquid fuel. Therefore, the electromagnetic pump 4 sucks only the liquid fuel,
The discharge from the electromagnetic pump 4 is stable, and the combustion of the burner unit 5 does not become abnormal. In addition, since the notch 25C has a tapered shape with a wide lower portion and a narrow upper portion, air is easy to escape, and there is little entry of dust from the notch. Furthermore, rib 25A
Since the lower part is wider and the upper part is notched in a tapered shape, the edge of the notch 25C is eliminated, so even if the filter 26 sintered with resin particles is fitted, resin particles may be shaved at that time. And the adverse effect of the shavings (resin particles) is eliminated.

Therefore, the electromagnetic pump can be used accurately and stably for a long time, and an excellent liquid combustion supply device can be provided.

Effect of the Invention As described above, according to the present invention, the electromagnetic pump does not suck in dust and sucks liquid fuel containing no air, so that stable discharge can be obtained, and abnormal combustion due to air bite is prevented. In addition to this, even if the sintered filter is fitted to the suction pipe, shavings that are likely to occur at that time are reduced, and the electromagnetic pump can be used with high accuracy over a long period of time. .

[Brief description of the drawings]

1 is a cross-sectional view of a liquid fuel supply device according to an embodiment of the present invention, FIG. 2 is a side view of the same, FIGS. 3 and 4 are cross-sectional views of main parts of a hot air heater using the same device, FIG. 5 is a sectional view of a main part of a conventional liquid fuel supply device. 11 ... Plumb, 16 ... Plunger, 22 ... Solenoid, 25 ... Suction pipe, 25A ... Rib, 25B ... Mating part,
25C …… Notch, 26 …… Filter.

Claims (1)

(57) [Claims] 1. A pipe forming a flow path of a liquid fuel, a discharge valve located at an upper portion of the pipe, which opens a valve when discharging liquid fuel and closes a valve when suctioning the liquid fuel, and a discharge valve located at a lower part thereof A plunger having a suction valve portion therein which opens and closes the valve when moving upward and sucks liquid fuel between the discharge valve, and closes and pushes the liquid fuel upward when moving upward; Part, a solenoid for moving a plunger part up and down around the pipe post, and a suction pipe disposed below the pipe post and serving as a path for sucking up liquid fuel in the tank,
A ring-shaped fitting portion is provided at an appropriate position in the longitudinal direction of the suction pipe, and a sintered filter is mounted on the fitting portion so as to cover the suction pipe from below, and a portion of the fitting portion does not have an oil film. A liquid fuel supply device, wherein the bypass passage is provided with notches formed in a tapered shape having a wide lower portion and a narrow upper portion.