JPH11211019A - Liquid fuel combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a shortening of preheating time, a stabilization of vaporization and a reduction in power consumption in combustion and eliminate a drop in the level of combustion and abnormal combustion in a short time otherwise caused when a fuel containing a high boiling point component is used at a vaporization part of a liquid fuel combustion section. SOLUTION: There are arranged a roughly flat vaporization chamber 26 with a nozzle part 23 at one end and a fuel supply port 28 at the other end, a heat transfer part 25, heaters 30a and 30b and a heat buffer 31 provided between the heat transfer part 25 and the heater 30a to heat the vaporization chamber 26. At the start of operation, the amount of heat transferred to a heat transfer body 25 of the heater 30a is reduced by the heat buffer body 31 to transfer more heat to the vaporization chamber 26 so that the time is shortened until the vaporization chamber 26 reaches the temperature of vaporizing a fuel after the electric energization thereof to reduce the waiting time for combustion. In addition, the vaporization chamber 26 is heated by combustion heat during the combustion to allow lowering of power consumption. Heating is penetrated deep into the vaporization chamber 26 and thus, eliminates parts lower in temperature to promote the vaporization of a fuel thereby restricting the generation of tar.

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, particularly to a vaporization section.

[0002]

2. Description of the Related Art A conventional liquid fuel combustion apparatus of this type has been known as disclosed in Japanese Patent Application Laid-Open No. Hei 8-68509. This will be described with reference to FIG.

In the figure, reference numeral 1 denotes a vaporizer, a circular burner receiving seat 2 is provided on the upper portion thereof, and a nozzle portion 3 is disposed substantially at the center of the burner receiving seat 2, and between the burner receiving seat 2 and the nozzle portion 3. An opening 4 for supplying combustion air is provided. A cylindrical vaporizing chamber 6 is formed through a communication port 5 communicating with the nozzle portion 3.
And a vaporizing element 7 for promoting vaporization of fuel is provided in the vaporizing chamber 6, and a fuel supply port 8 for supplying fuel is provided at an end of the vaporizing chamber 6 on the opposite side of the communication port 5. . A U-shaped heater 9 is provided along the lower half of the burner seat 2 on the opposite side of the vaporization chamber 6 of the vaporizer 1. 10
Is mounted on the upper part of the burner receiving seat 2 together with the burner 11 having a large number of flame holes 12 formed by a mixing tube.

In the above configuration, when the vaporizer 1 is heated to a predetermined temperature by the heater 9, the liquid fuel is supplied by the fuel supply means 13 through the fuel supply port 8, and the fuel is supplied into the vaporizer 7 heated to a high temperature. Start vaporization. The vaporized gas vaporized in the vaporization chamber 6 is ejected from the nozzle 3 into the mixing pipe 10 through the communication port 5. The ejected vaporized gas sucks primary air for combustion by an ejector effect and is mixed in the mixing pipe 10 to become an air-fuel mixture, which is ejected from a flame hole 12 formed in a burner 11 and burned. Then, the combustion exhaust gas generated by the combustion is mixed with air to become warm air and used for heating or the like. When the combustion is started, in order to further heat the vaporization chamber 6 through the heat receiving flange 2a formed in the burner receiving seat 2 by the combustion heat,
The heating by the heater 9 becomes unnecessary, and the combustion is continued while the fuel is vaporized by its own combustion heat.

[0005]

However, in the combustion apparatus described in Japanese Patent Laid-Open Publication No. Hei 8-68509, a heater 9 is used to heat the carburetor 1 at the start of combustion.
And an indirect heating system in which heat generated by the heater 9 is heated through the metal part of the vaporizer 1 to the vaporizing element 7 for vaporizing the fuel. Therefore, there is a problem that the time from when the heater 9 is energized to when the vaporizing element 7 reaches the fuel vaporizable temperature becomes long.

[0006] Further, since the vaporizing element 7 for vaporizing the fuel is cylindrical, the internal temperature is hardly increased, so that when the fuel containing the oxidized deteriorated kerosene or the high boiling point dissimilar oil component is used for a long time, the fuel is removed. It was not possible to completely vaporize, and there was a possibility that a tar component was generated in the vaporization element 7 and clogging was caused, resulting in poor combustion.

[0007]

In order to solve the above-mentioned problems, the present invention provides a burner for burning a vaporized gas obtained by evaporating a liquid fuel, a substantially flat nozzle having a nozzle at one end and a fuel supply port at the other end. The heat exchanger includes a vaporization chamber, a heat transfer section that transfers the combustion heat of the burner to the vaporization chamber, a heater, and a heat buffer between the heat transfer section and the heater.

According to the above invention, the liquid fuel supplied to the heated vaporizing chamber moves and diffuses in the vaporizing chamber from the fuel supply port side, and becomes a vaporized gas while being gradually heated, and is ejected from the nozzle portion by the burner. Burn. When the heater is energized and the vaporization chamber is preheated, the vaporization chamber and the heat transfer section are heated by the heater and the heat between the heater and the heat transfer section is provided by a heat buffer provided between the heater and the heat transfer section. The heat generated by the heater is increased by increasing the conduction resistance and transferred to the vaporization chamber, and the vaporization chamber can be heated more quickly.When the heater is energized at the start of combustion, the vaporization chamber reaches a temperature at which fuel can be vaporized. The time to do it can be shortened. Next, when the combustion starts, the heat of combustion heats the vaporization chamber through the heat transfer section and the heat buffer, thereby making it possible to heat the vaporization chamber with the combustion heat even when the power supply to the heater is stopped. Power consumption during combustion can be reduced.

Further, by providing a heat transfer section, the heat capacity of the vaporization chamber is supplemented, and a temporary decrease in the temperature of the vaporization chamber caused when fuel is supplied to the vaporization chamber is suppressed, thereby stabilizing vaporization. it can.

[0010] Further, since the vaporization chamber is formed in a substantially flat shape, it is possible to heat the interior of the vaporization chamber to a high temperature. The fuel which has become high can also be vaporized, and the tarification of the altered kerosene in the vaporization chamber can be suppressed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid fuel combustion apparatus according to a first aspect of the present invention has a substantially flat shape having a burner for burning a vaporized gas obtained by evaporating liquid fuel, a nozzle at one end, and a fuel supply port at the other end. -Shaped vaporization chamber, a heat transfer section for transferring the combustion heat of the burner to the vaporization chamber, a heater, and a heat buffer between the heat transfer section and the heater. The thermal conductivity between the heater and the electric heating unit is configured to be smaller than the thermal conductivity between the vaporization chamber and the heater.

The liquid fuel supplied to the heated vaporizing chamber moves and diffuses in the vaporizing chamber from the fuel supply port side, becomes a vaporized gas while being gradually heated, and is ejected from the nozzle portion and burned by the burner. When the heater is energized and the vaporization chamber is preheated, the vaporization chamber and the heat transfer section are heated by the heater, but the heat buffer between the heater and the heat transfer section allows the heat transfer between the heater and the heat transfer section. The heat generated by the heater is transferred to the vaporization chamber because the heat conduction resistance is increased, and the vaporization chamber can be heated quickly, and the heater is energized at the start of combustion, and then reaches the fuel vaporization temperature in the vaporization chamber. The time to do it can be shortened. Next, when the combustion starts, the heat of combustion heats the vaporization chamber through the heat transfer section and the heat buffer, thereby making it possible to heat the vaporization chamber with the combustion heat even when the power supply to the heater is stopped. Power consumption during combustion can be reduced. Further, by providing the heat transfer section, the heat capacity of the vaporization chamber can be replenished, and a temporary decrease in the temperature of the vaporization chamber caused when the fuel is supplied to the vaporization chamber can be suppressed, and the vaporization can be stabilized.

Further, since the vaporization chamber is formed in a substantially flat shape, it is possible to heat the interior of the vaporization chamber to a high temperature. The fuel which has become high can also be vaporized, and the tarification of the altered kerosene in the vaporization chamber can be suppressed.

According to a second aspect of the present invention, there is provided a liquid fuel combustion apparatus comprising: a burner for burning a vaporized gas obtained by evaporating a liquid fuel; a burner receiving seat for mounting the burner; a nozzle at one end; A vaporizing chamber having a flat fuel supply port, a heat transfer section connected to the burner receiving seat and transferring the combustion heat of the burner to the vaporization chamber, a heater, the heat transfer section, and the heat transfer section. The heat buffer was provided between the heater and the heater.

When the heater is energized and the vaporization chamber is heated, the vaporization chamber is heated and, at the same time, the burner is heated via the heat transfer section and the burner receiving seat connected to the heat transfer section, so that the combustion is started at the start of combustion. The time required for the vaporization chamber to reach the fuel vaporization temperature after the heater is energized can be shortened, and the premixed gas ejected from the burner hole at the time of ignition can be easily ignited, resulting in white smoke and odor during ignition. Can be reduced. Further, when the combustion starts, the combustion heat can heat the vaporization chamber from the burner receiving seat via the heat transfer section, so that there is no need to supply power to the heater, and power consumption during combustion can be reduced.

According to a third aspect of the present invention, in the liquid fuel combustion apparatus, a heater, a thermal buffer, and a heat transfer section are provided on both sides of the flat vaporizing chamber on the wide side, and the flat vaporizing chamber has a wide area. The surface on the side is oriented so as to easily absorb the combustion heat of the burner.

By providing heaters on both sides of the vaporization chamber, the time required for the heater to be energized at the start of combustion and for the vaporization chamber to reach the fuel vaporizable temperature after the start of combustion can be reduced. In addition, during combustion, the vaporization chamber is heated by the combustion heat from both sides via the heat transfer sections provided on both sides of the vaporization chamber, so that the center of the vaporization chamber can be heated to a substantially uniform temperature.

The liquid fuel combustion device according to claim 4 of the present invention has a configuration in which a heat buffer is provided at a part between the heater and the heat transfer section.

By directly heating the vaporization chamber and a part of the heat transfer portion required at the start of combustion by the heater at the time of preheating, the heating rate can be increased. Time can be shortened.

Further, in the liquid fuel combustion apparatus according to claim 5 of the present invention, the heat buffer is provided on the flat upper surface facing the fuel supply port side of the vaporizing chamber and on the flat lower surface on the nozzle side of the vaporizing chamber. This is a configuration provided.

By directly heating the vaporizing chamber and the heat transfer section on the nozzle side with a heater at the time of preheating, the rate of temperature rise near the fuel inlet of the vaporizing chamber is increased to enable the fuel to be vaporized early after energization. By heating the burner early through the burner receiving seat connected to the heat transfer section, it is easy to ignite the premixed gas ejected from the burner flame at the time of ignition, and to reduce white smoke and odor at the time of ignition. Can be reduced.

In the liquid fuel combustion apparatus according to a sixth aspect of the present invention, the heat buffer is configured to also serve as an electrical insulator between the heater and the heat transfer section. By configuring the insulator as one component, the number of components can be reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of an essential part showing a liquid fuel combustion apparatus according to Embodiment 1 of the present invention, FIG. 2 is a top view of a vaporization section of the liquid combustion apparatus, and FIG. It is a bottom view of the vaporization part of FIG.

In FIG. 1 to FIG. 3, reference numeral 21 denotes a vaporizing portion, a circular burner receiving seat 22 is provided on the upper portion thereof, and a nozzle portion 23 is disposed substantially at the center of the burner receiving seat 22. An opening 24 into which combustion air flows is provided between the openings 23. Reference numeral 25 denotes a heat transfer portion, and a burner receiving seat 22
And is integrally formed. Reference numeral 26 denotes a vaporization chamber having a substantially flat shape, one end of which communicates with the nozzle 23 via a vaporized gas passage 27, and a fuel supply port 28 provided at the other end. 29 is a vaporizing element provided in the vaporizing chamber 26, and 30a and 30b are heaters provided so as to sandwich the vaporizing chamber 26 from both sides. 3
1 is a heat buffer plate provided between the heater 30a and the heat transfer section 25. Reference numeral 32 denotes a mixing tube located above the nozzle portion 23 and mounted on the burner receiving seat 22, and reference numeral 33 denotes a burner provided with a large number of flame holes 34 on a lower peripheral wall. 35 is a fuel vaporization unit 2
Reference numeral 36 denotes a fuel pump for supplying the fuel to the nozzle 1, a needle 36 for opening and closing the nozzle 23, and a solenoid 37 for driving the needle 36.

Next, the operation and operation will be described. When the heaters 30a and 30b are energized and the vaporization chamber 26 reaches a predetermined temperature, the fuel pump 35 is started to supply fuel from the fuel supply port 28 into the vaporization chamber 26. Fuel supply port 28
The fuel further supplied to the vaporization chamber 26 diffuses and moves while being heated toward the nozzle portion in the pores of the vaporization element 29 having the pores, and gradually vaporizes from the low-boiling components in the fuel to become gas from liquid. It becomes a vaporized gas and is ejected from the nozzle portion 23 via the vaporized gas passage 27. When the vaporized gas is ejected from the nozzle 23, the primary air is sucked from the opening 24 by the ejector effect and is mixed with the vaporized gas in the mixing pipe 32 and burns in the flame hole 34 through the burner 33. During the combustion, the burner receiving seat 22 is heated by the flame formed in the flame hole portion 34, and the vaporizing chamber 26 is heated through the heat transfer part 25 which is connected to the burner receiving seat 22 and is integrally provided. Does not require heating by the heater 30a, and the vaporized combustion is maintained only by the combustion heat.

When the vaporization chamber 26 reaches a predetermined temperature and starts fuel supply, the temperature temporarily drops due to the small heat capacity of the vaporization chamber 26, which may cause poor vaporization of the fuel. In this case, since the heat transfer section 25 is adjacent to the vaporization chamber 26, this temperature drop is suppressed by the heat capacity of the heat transfer section 25, and stable vaporization can be obtained. Further, when the heaters 30a and 30b are energized to heat the vaporization chamber 26, when the heater 30a generates heat, the vaporization chamber 26 is heated and the heat transfer section 25 is heated at the same time.
The heat resistance between the heater 30a and the heat transfer unit 25 is larger than the heat resistance between the heater 30a and the vaporization chamber 26 because the heat buffer plate 31 is provided between the heat transfer unit 25 and the heat buffer 30. The heat generated in step (1) is transferred to the vaporization chamber 26 in a large amount, and the vaporization chamber 26 can be quickly heated. At this time, if the heat buffer plate 31 is not provided, when the heater 30a generates heat at the start of energization, heat is dispersed to simultaneously heat the vaporization chamber 26 and the heat transfer unit 25, and the heating speed of the vaporization chamber 26 is reduced. During burning,
Although the vaporization chamber 26 is heated by the heat of combustion via the heat transfer section 25, even though the heat buffer plate 31 is interposed, the heating speed is slow but the amount of heat is large, so that the fuel in the vaporization chamber 26 is vaporized. The amount of heat can be secured. In the process of fuel vaporization in the vaporization chamber 26, if there is a low temperature portion in the fuel diffusion passage in the vaporization chamber 26 and the built-in vaporization element 29, a part of the fuel completes vaporization in the vaporization chamber. Instead, the tar generated for vaporization in the downstream nozzle portion 23 closes the vaporized gas ejection hole of the nozzle portion 23 and reduces the amount of combustion. However, according to the configuration of this embodiment, the vaporization chamber 26 is flattened. Because it is composed, it is heated to a high temperature up to the inside,
The fuel can be completely vaporized in the vaporization chamber 26 because no low-temperature portion is generated.

(Embodiment 2) FIG. 4 is a longitudinal sectional view showing a main part of a liquid fuel combustion apparatus according to Embodiment 2 of the present invention.

The second embodiment differs from the first embodiment in that heaters 30a and 30b, buffers 31a and 31b, and heat transfer sections 25a and 25b are provided on both surfaces of the vaporizer 21. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. Heater 3
0a and 30b are energized, and the vaporization chamber 26 reaches a predetermined temperature. A fuel pump (not shown) is started to supply fuel from the fuel supply port 28 into the vaporization chamber 26. Fuel supply port 28
The fuel further supplied into the vaporization chamber 26 diffuses and moves in the pores of the vaporization element 29 having the pores while being heated toward the nozzle part 23 side, vaporizes from the low boiling point component in the fuel, and turns into gas from liquid. It becomes a vaporized gas and is ejected from the nozzle portion 23 via the vaporized gas passage 27.

According to the structure of the present embodiment, the substantially flat vaporizing chamber 26 is heated from both sides so as to be sandwiched by the heaters 30a and 30b at the start of operation, so that the vaporizing chamber 26 is energized from the start of energization.
The time required for the fuel inside to reach the vaporizable temperature can be further reduced. Further, since the heat received by the burner receiving seat 22 heats the vaporization chamber 26 from both sides through the heat transfer portions 25a and 25b, it is possible to heat the vaporization chamber 26 to a high temperature and a substantially uniform temperature up to the central portion inside the vaporization chamber 26. It is possible to further suppress the tarification of the fuel.

Further, by using the heat buffer plates 31a and 31b as an electrical insulator between the heaters 30a and 30b and the heat transfer portions 25a and 25b, the heat transfer members 25a and 25b are used.
The insulating material on the side can be eliminated, and the number of parts can be reduced.

(Embodiment 3) FIG. 5 is a longitudinal sectional view showing a main part of a liquid fuel combustion apparatus according to Embodiment 3 of the present invention.

The third embodiment is different from the second embodiment in that the thermal buffers 31a and 31b are replaced with the vaporizing section heaters 30a and 3b.
0b and the heat transfer portions 25a and 25b. The components having the same reference numerals as those in the second embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. Heater 3
When electricity is supplied to the fuel cells 0a and 30b and the vaporization chamber 26 reaches a predetermined temperature, a fuel pump (not shown) is started to supply fuel from the fuel supply port 28 into the vaporization chamber 26. Fuel supply port 2
The fuel supplied from 8 into the vaporization chamber 26 diffuses and moves in the pores of the vaporization element 29 having a porous shape while being heated toward the nozzle portion 23, and vaporizes from a low boiling point component in the fuel to convert from liquid to gas. It becomes a vaporized gas and is ejected from the nozzle portion 23 via the vaporized gas passage 27.

According to the structure of this embodiment, the heat buffer 31a
Is provided between the heater 31a on the fuel supply port 28 side of the vaporization chamber 26 and the heat transfer section 25a, and a heat buffer 31b is provided between the burner receiving seat 22 side of the heat transfer body 25a and the heater 30b. Therefore, when the heaters 30a and 30b are energized, the fuel supply port 28 side of the vaporization chamber 26 and the heat transfer body 25a side are directly heated. Therefore, the fuel supply port 2 of the vaporization chamber 26
A burner (not shown) in which the lower surface on the 8 side quickly reaches the fuel vaporizable temperature and the burner receiving seat 22 integrally connected to the heat transfer body 25a is quickly heated and is mounted on the heated burner receiving seat 22. Is heated, the ignition of the vaporized gas can be performed more easily.

[0037]

As described above, in the liquid fuel combustion apparatus according to the first aspect of the present invention, the substantially flat vaporization chamber is directly heated by the heater, and the heat transfer section is heated via the heat buffer. As a result, the time from when power is supplied to the heater at the start of operation to when the vaporization chamber reaches the vaporization temperature of the fuel is shortened, and the combustion waiting time is short. At the time of combustion, since the vaporization chamber is heated by the heat of combustion via the heat transfer body, it is not necessary to energize the heater, and power consumption can be reduced. The heat transfer section replenishes the heat capacity of the vaporization chamber, suppresses a temporary decrease in temperature during fuel supply, and achieves stable vaporization. Since the inside of the vaporization chamber can be heated, there is no low-temperature portion, so that vaporization of fuel is promoted and tar generation can be suppressed.

Further, in the liquid fuel combustion apparatus according to the second aspect, since the heat receiving portion and the heat transfer portion of the combustion heat are connected to each other, during the combustion, the vaporization chamber is heated by the combustion heat via the heat transfer member. It is not necessary to supply power to the heater, and power consumption can be reduced. By preheating the burner via the burner seat when the heater is energized, reduction of white smoke and odor at the time of ignition can be reduced.

In the liquid fuel fuel device according to the third aspect, since the vaporization chamber is sandwiched between the heaters from both sides, heat conduction to the vaporization chamber is good and the heater is energized at the start of operation. The time required for the vaporization chamber to reach the vaporization temperature of the fuel can be reduced, and the inside of the vaporization chamber can be heated.

In the liquid fuel combustion apparatus according to the fourth aspect, a heat buffer plate is provided in a part between the heater and the heat transfer section. By directly heating the vaporization chamber and a part of the heat transfer section, the rate of temperature rise can be increased, and the time from energizing the heater to starting combustion can be reduced.

In the liquid fuel combustion apparatus according to a fifth aspect of the present invention, the heat buffer is provided on the flat upper surface facing the fuel supply port side of the vaporizing chamber and on the flat lower surface on the nozzle side of the vaporizing chamber. By preheating the vaporization chamber and the heat transfer part on the nozzle side directly with a heater during preheating,
The fuel can be vaporized at an early stage after energization, and the burner can be heated at an early stage to facilitate ignition of a premixed gas ejected from a burner opening of the burner at the time of ignition.

Further, in the liquid fuel combustion apparatus according to claim 6 of the present invention, the heat buffer is configured to also serve as an electrical insulator between the heater and the heat transfer section, thereby reducing the number of parts. Can be planned

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a liquid fuel combustion device according to a first embodiment of the present invention.

FIG. 2 is a top view of a carburetor of the liquid fuel combustion device.

FIG. 3 is a bottom view of a carburetor of the liquid fuel combustion device.

FIG. 4 is a longitudinal sectional view of a main part of a liquid fuel combustion device according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part of a liquid fuel combustion device according to a third embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a main part of a conventional liquid fuel combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Vaporizer 22 Burner receiving seat 23 Nozzle part 25, 25a, 25b Heat transfer part 26 Vaporization chamber 28 Fuel supply port 29 Vaporization element 30a, 30b Heater 31, 31a, 31b Heat buffer 33 Burner

Claims (6)

[Claims] 1. A burner for burning a vaporized gas obtained by evaporating a liquid fuel, a substantially flat vaporizing chamber having a nozzle at one end and a fuel supply port for the liquid fuel at the other end, and the heat of combustion of the burner. A heat transfer portion for transferring heat to the vaporization chamber; a heater; and a heat buffer between the heat transfer portion and the heater, wherein the heat conductivity between the heater and the heat transfer portion is reduced by the vaporization. A liquid fuel combustion device configured to be smaller than a heat transfer coefficient between a chamber and the heater. A burner for burning a vaporized gas obtained by vaporizing a liquid fuel; a burner receiving seat for mounting the burner; a nozzle at one end; and a fuel supply port for the liquid fuel at the other end. A vaporizing chamber, a heat transfer section connected to the burner receiving seat and transmitting the combustion heat of the burner to the vaporization chamber, a heater, and a heat buffer between the heat transfer section and the heater. A liquid fuel combustion apparatus having a configuration. 3. A flat-type wide vaporization chamber is provided with a heater, a heat buffer, and a heat transfer section on both sides of the wide side of the wide vaporization chamber to absorb the combustion heat of the burner on the wide side of the flat vaporization chamber. 3. The liquid fuel combustion device according to claim 1, wherein the liquid fuel combustion device is configured in a direction that is easy to use. 4. The liquid fuel combustion apparatus according to claim 1, wherein the heat buffer is provided at a portion between the heater and the heat transfer section. 5. The liquid fuel combustion apparatus according to claim 4, wherein the heat buffer is provided on the flat upper surface facing the fuel supply port side of the vaporization chamber and on the flat lower surface on the nozzle portion side of the vaporization chamber. 6. A heat buffer according to claim 1, wherein said heat buffer is also used as an electrical insulator between said heater and said heat transfer section.
A liquid fuel combustion device according to any one of the preceding claims.