JP2001141230A - Liquid fuel combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid fuel combustion apparatus which eliminates the after-dripping of the liquid fuel from the nozzle top end after stopping a fuel pump and reduces malodors produced at extinguishing. SOLUTION: The liquid fuel combustion apparatus having a carburetor 4 having a carburetor chamber 4A for gasifying a liquid fuel and a burner head 16 provided at the top and an oil feed pipe 6 for feeding the liquid fuel into the carburetor chamber 4A which has an electromagnetic pump 8 provided at the base and a nozzle 7 inserted in the carburetor 4 at the top end, comprises an orifice 6A provided in the oil feed pipe 6 and an accumulator 10 provided at the downstream of the orifice 6A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus used for a petroleum fan heater or the like, which vaporizes and burns a liquid fuel such as kerosene.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid fuel combustion apparatus, for example, as disclosed in Japanese Patent Application Laid-Open No. 11-63427, the temperature rise of a nozzle in a carburetor is suppressed to reduce odor at the time of fire extinguishing. The discharge amount of the liquid fuel at the time of fire extinguishing is controlled by controlling the voltage applied to the electromagnetic pump, as disclosed in Japanese Patent Application Laid-Open No. 6-109233, for example. In some cases, the fuel remaining in the nozzle portion is returned to the oil pan using the difference in oil level head to reduce the smell at the time of fire extinguishing.

[0003] As described above, although various inventions have been made to reduce the odor at the time of extinguishing a liquid fuel combustion device, this problem could not be fundamentally solved.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and eliminates dripping of liquid fuel from the tip of a nozzle portion after a fuel pump is stopped, thereby reducing the generation of odor during fire extinguishing. It is an object of the present invention to provide a liquid fuel combustion device that can be reduced.

[0005]

According to a first aspect of the present invention, there is provided a vaporizer having a vaporizing chamber for vaporizing a liquid fuel, a vaporizer having a burner head provided on an upper part thereof, and a base. A fuel pump having a fuel pump on its side, a nozzle portion inserted into the vaporizer at a tip end side, and an oil feed pipe for supplying liquid fuel into the vaporization chamber. And an orifice part is provided in the middle of the device, and an accumulator is provided downstream of the orifice part.

According to a second aspect of the present invention, in the liquid fuel combustion apparatus according to the first aspect, the accumulator has a pressure transmission pipe having an end communicating with an oil feed pipe.

According to a third aspect of the present invention, in the liquid fuel combustion apparatus according to the first aspect, the accumulator has a pressure transmission pipe having an end portion inserted into an oil feed pipe, and is provided with a pressure feed pipe. In this configuration, an orifice portion is formed by an end of a pressure transmission pipe inserted in an oil pipe.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

1 and 2, reference numeral 1 denotes a cartridge type fuel tank for storing a liquid fuel such as kerosene, etc., 3 denotes an oil pan for temporarily storing the liquid fuel supplied from the fuel tank 1, and 4 denotes a liquid fuel. The vaporizer 4A is a vaporization chamber provided inside the vaporizer 4, and 5 is a cover covering the outer periphery of the vaporizer 4.

6 is an oil feed pipe for sending liquid fuel to the vaporizer 4;
6A is an orifice portion provided in the middle of the oil feed pipe 6, and 7 is provided on the tip side of the oil feed pipe 6, and
The liquid fuel is ejected from the nozzle 7A at the tip of the nozzle 7 into the vaporization chamber 4A.

Numeral 8 denotes an electromagnetic pump (fuel pump) provided on the base side of the oil feed pipe 6. This electromagnetic pump 8 is fixed to the oil pan 3, and pumps up and sends liquid fuel in the oil pan 3. The oil is sent into the vaporization chamber 4A through the oil pipe 6 and the nozzle section 7.

Reference numeral 10 denotes a diaphragm-type accumulator provided in the oil feed pipe 6 downstream of the orifice section 6A. A pressure change inside the oil feed pipe 6 downstream of the orifice portion 6A is transmitted to the accumulator 10 via the pressure transmission pipe 11. 10A
Is an extendable partition provided on the accumulator 10 so as to divide the inside of the accumulator 10 into two parts.

Reference numeral 16 denotes a burner head having a cylindrical shape provided to cover the upper opening of the vaporizer 4. A plurality of flame holes 15 for ejecting the mixed gas from the vaporizer 4 are provided on the peripheral wall of the burner head 16. Is provided. Reference numeral 24 denotes a spark plug provided on the outer periphery of the burner head 16, reference numeral 25 denotes a frame rod for detecting the presence or absence of a flame, reference numeral 9 denotes a mixing promoting cylinder provided inside the burner head 16, reference numeral 17 denotes an upper end opening of the vaporizer 4. This is a diaphragm plate fitted and mounted on. Reference numeral 18 denotes a burner ring made of a heat-resistant metal disposed on the outer peripheral portion of the burner head 16. The burner ring 18 is screwed to the upper end surface of the vaporizer 4.

The vaporizer 4 is made of aluminum die-cast, and a primary air supply port 19 opened in the cover 5 is formed on a peripheral wall of the vaporizer 4, and the primary air supply port 19 is formed through the primary air supply port 19. The ejection port 7A of the nozzle 7 faces the vaporization chamber 4A. Reference numeral 20 denotes a heating heater such as a sheath heater for heating the vaporizer 4.
Is buried in the upper part of the peripheral wall of the vaporizer 4. Reference numeral 21 denotes a temperature detector that detects the temperature of the vaporizer 4.

Reference numeral 23 denotes a combustion blower. The combustion blower 23 includes a fan case 23A and a fan case 2A.
3A, a combustion fan 23B and a combustion fan 23B.
And a motor 23C for rotating B, and supplies the room air sucked from the air suction port 22 of the fan case 23A to the inside of the cover 5 as combustion air, and
The primary air is supplied to the vaporizing chamber 4A of the vaporizer 4 through the primary air supply port 19.

In the embodiment constructed as described above, first, when an operation switch (not shown) is turned on, the heating heater 20 is energized to heat the vaporizer 4, and the liquid fuel is detected by the temperature detector 21. Temperature required for the vaporization of, for example, 20
Preheat until 0-300 ° C is detected. Then, when the preheating is completed, the combustion blower 23 is driven, and the room air is used as combustion air from the air inlet 22 through the fan case 2.
The combustion air sucked into the fan case 3A and sucked into the fan case 23A is sent into the internal space of the cover 5 and supplied from the primary air supply port 19 to the vaporization chamber 4A as primary air.

On the other hand, the electromagnetic pump 8 is driven almost simultaneously with the start of the driving of the combustion blower 23, and the liquid fuel in the oil receiving tray 3 is pumped by the driving of the electromagnetic pump 8, and the pumped liquid fuel is supplied to the oil supply pipe. 6, the gas is ejected from the ejection port 7A of the nozzle portion 7 into the vaporization chamber 4A of the vaporizer 4, and is vaporized in the vaporization chamber 4A to become a vaporized gas. This vaporized gas is mixed with the primary air in the vaporizing chamber 4A to form a mixed gas,
When this mixed gas passes through the throttle plate 17, the concentration distribution of the vaporized gas becomes substantially uniform and is sent into the mixing promoting cylinder 9.
After being rectified by passing through a plurality of holes (not shown) on the upper surface of the mixing promoting cylinder 9, each flame hole 1 of the burner head 16 is rectified.
5, the mixed gas is ignited by the spark discharge of the ignition plug 24 to form a flame and start combustion. After the start of combustion, heat from the flame is recovered by the vaporizer 4 by the burner ring 18 or the like and the vaporizer 4 is heated, so that the power supply to the heating heater 20 is stopped.
The vaporizer 4 is maintained at a vaporizable temperature.

Here, due to the action of the orifice portion 6A provided in the middle of the oil feed pipe 6, the pressure in the oil feed pipe 6 downstream of the orifice portion 6A becomes a negative pressure. This negative pressure is transmitted to the accumulator 10 via a pressure transmission pipe 11 provided downstream of the orifice portion 6A.
Then, the partition wall 10A provided inside the accumulator 10 is deformed into a hemispherical shape by the negative pressure as shown by a dotted line 10B in FIG. As described above, when the electromagnetic pump 8 operates and is in a combustion state, the inside of the accumulator 10 is always in a negative pressure state.

Next, the fire extinguishing operation will be described. When the operation switch (not shown) is turned off, the driving of the electromagnetic pump 8 is stopped at the same time as the driving of the electromagnetic pump 8 is stopped, so that the supply of the liquid fuel to the vaporizer 4 is stopped and the fire is extinguished. After a few seconds, the driving of the combustion blower 23 is stopped.

Here, when the driving of the electromagnetic pump 8 is stopped and the supply of the liquid fuel to the vaporizer 4 is stopped, the nozzle 7
7A is open to the atmosphere, so the electromagnetic pump 8
Orifice section 6 of oil feed pipe 6 that was under negative pressure when
The pressure downstream of A becomes atmospheric pressure, and the accumulator 10
10A returns to the original state shown by the solid line in FIG. At this time, the liquid fuel remaining in the nozzle 7 is
Due to the suction effect of the return of the partition 10A of the accumulator 10, the nozzle 7 is returned to the oil feed pipe 6 so as to be separated from the jet port 7A at the tip of the nozzle portion 7. Therefore, after the electromagnetic pump 8 is stopped, the phenomenon that the liquid fuel is pushed out from the jet port 7A at the tip of the nozzle portion 7 to the vaporization chamber 4A, that is, the dripping of the fuel can be eliminated, and after the fire is extinguished due to the dripping, The generation of unburned gas is suppressed, and the generation of a strong odor at the time of fire extinguishing can be prevented.

According to this embodiment, the orifice portion 6A is provided in the middle of the oil feed pipe 6, and the orifice portion 6A
The accumulator 10 is provided downstream of the nozzle unit, so that when the electromagnetic pump 8 is stopped, the liquid fuel remaining in the nozzle unit 7 is separated from the ejection port 7A at the tip of the nozzle unit 7 by using the suction action of the accumulator 10. Since the fuel can be returned to the oil feed pipe 6 side, the fuel can be prevented from sagging, the generation of unburned gas due to the sagging can be suppressed, and the generation of a strong odor at the time of fire extinguishing can be prevented.

FIG. 3 shows another embodiment of the present invention. In the other embodiment, the accumulator 10
Has a pressure transmission pipe 26 having a lower end 26A inserted into the inside of the oil feed pipe 6, and a lower end 26A of the pressure transmission pipe 26 is provided with an inclined cut surface 27 which is cut obliquely. The cut surface 27 is inserted inside the oil feed pipe 6 so as to be on the downstream side of the flow of the liquid fuel when the electromagnetic pump 8 is driven, and the pressure transmission pipe 26 inserted inside the oil feed pipe 6 An orifice portion is formed at the lower end portion 26A.

In another embodiment constructed as described above, when the operation of the electromagnetic pump 8 is stopped, the accumulator 1
The liquid fuel remaining in the nozzle portion 7 can be returned to the oil feed pipe 6 away from the jet port 7A at the tip of the nozzle portion 7 by utilizing the suction action of 0, so that fuel drooping is prevented. However, generation of unburned gas due to this drooping is suppressed, and generation of a strong odor at the time of fire extinguishing can be prevented. In the other embodiment, since the orifice portion is formed by the lower end portion 26A of the pressure transmission pipe 26 inserted inside the oil feed pipe 6, it is necessary to process the oil feed pipe 6 to form the orifice portion. Therefore, the number of processing steps for the oil feed pipe 6 can be reduced, and the processing time and processing cost can be reduced.

[0024]

As described above, according to the first aspect of the present invention, there is provided a vaporizer having a vaporizing chamber for vaporizing a liquid fuel and having a burner head provided on an upper part thereof, and a fuel pump provided on a base side. A nozzle portion formed in the vaporizer at the tip end side, and an oil feed pipe for supplying liquid fuel into the vaporization chamber, wherein the orifice is provided in the middle of the oil feed pipe. And the accumulator provided downstream of the orifice portion, when the fuel pump is stopped, the suction operation of the accumulator is used to reduce the liquid fuel remaining in the nozzle to the oil feed pipe side. The fuel can be returned, and the fuel can be prevented from sagging, so that the generation of odor at the time of fire extinguishing can be reliably reduced.

According to the second aspect of the present invention, since the accumulator has the pressure transmission pipe having an end communicating with the oil feed pipe, the internal volume of the accumulator is apparently increased by the pressure transmission pipe. The accumulator can be made larger and a small accumulator can be used.

According to the third aspect of the present invention, the accumulator has a pressure transmission pipe having an end inserted in the oil supply pipe, and the pressure transmission pipe inserted in the oil supply pipe. Since the orifice part is formed by the end,
The number of processing steps for the oil pipe can be reduced, and the processing time and processing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a liquid fuel combustion apparatus showing one embodiment of the present invention.

FIG. 2 is an explanatory view of a main part in the same manner.

FIG. 3 is an explanatory view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 4 vaporizer 4A vaporization chamber 6 oil feed pipe 6A orifice part 7 nozzle part 7A jet port 8 electromagnetic pump (fuel pump) 10 accumulator 11 pressure transmission pipe 16 burner head 26 pressure transmission pipe 26A lower end of pressure transmission pipe (orifice part)

Claims (3)

[Claims] 1. A vaporizer having a vaporization chamber for vaporizing a liquid fuel and having a burner head provided on an upper part thereof, a fuel pump provided on a base side, and a nozzle inserted into the vaporizer on a front end side. A liquid fuel combustion apparatus having an oil supply pipe for supplying liquid fuel into the vaporization chamber, wherein an orifice part is provided in the middle of the oil supply pipe, and an accumulator is provided downstream of the orifice part. Characteristic liquid fuel combustion device. 2. The liquid fuel combustion apparatus according to claim 1, wherein the accumulator has a pressure transmission pipe having an end communicating with an oil supply pipe. 3. The accumulator has a pressure transmission pipe having an end inserted in an oil feed pipe, and an orifice portion formed by the end of the pressure transmission pipe inserted in the oil feed pipe. The liquid fuel combustion device according to claim 1, wherein: