JP3677982B2 - Liquid fuel combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vaporizing unit of a liquid fuel combustion apparatus.
[0002]
[Prior art]
A conventional liquid fuel combustion apparatus of this type has been known as described in JP-A-8-68509. This will be described with reference to FIG.
[0003]
In the figure, reference numeral 1 denotes a carburetor, which is provided with a circular burner receiving seat 2 at the upper portion thereof, a nozzle portion 3 is arranged substantially at the center of the burner receiving seat 2, and combustion air between the burner receiving seat 2 and the nozzle portion 3. Is provided with an opening 4 for supplying. 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 fuel vaporization is provided in the vaporizing chamber 6 on the opposite side of the communication port 5. A fuel supply port 8 for supplying fuel is provided at the end of the vaporizing chamber 6. A U-shaped heater 9 is arranged along the lower half of the burner receiving seat 2 on the opposite side of the vaporizing chamber 6 of the vaporizer 1. A mixing tube 10 is placed on the upper part of the burner receiving seat 2 together with a burner 11 having a large number of flame holes 12 formed therein.
[0004]
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 filler port 8, and the fuel starts to vaporize in the vaporizer 7 heated to a high temperature. To do. The vaporized gas vaporized in the vaporizing chamber 6 is ejected from the nozzle portion 3 into the mixing tube 10 through the communication port 5. The ejected vaporized gas sucks the primary air for combustion by the ejector effect and is mixed in the mixing tube 10 to become air-fuel mixture, which is ejected from the flame hole 12 formed in the burner 11 and burned. The combustion exhaust gas generated by the combustion is mixed with air to become warm air and used for heating or the like. When combustion is started, the vaporization chamber 6 is further heated by the combustion heat via the heat receiving flange 2a formed on the burner seat 2, so that heating by the heater 9 is unnecessary, and combustion is performed while vaporizing the fuel with its own combustion heat. It is supposed to continue.
[0005]
[Problems to be solved by the invention]
However, in the combustion apparatus having the configuration described in Japanese Patent Application Laid-Open No. 8-68509, the heater 9 is used to heat the vaporizer 1 at the start of combustion, and the heat generated in the heater 9 is used as the metal part of the vaporizer 1. This is an indirect heating system in which the vaporizing element 7 for vaporizing the fuel is heated. Therefore, there has been a problem that the time from when the heater 9 is energized until the vaporizing element 7 reaches the vaporizable temperature of the fuel becomes longer.
[0006]
Further, since the vaporizing element 7 that vaporizes the fuel has a cylindrical shape, it is difficult to increase the internal temperature, and the fuel is completely vaporized when using a modified kerosene that has been stored and oxidized for a long period of time or a fuel containing a different boiling oil component. There is a possibility that a tar component is generated in the vaporizing element 7 and combustion failure is caused by clogging.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a burner that burns vaporized gas obtained by vaporizing liquid fuel, a substantially flat vaporization chamber that includes a nozzle portion at one end and a fuel supply port at the other end, and combustion heat of the burner. The heat transfer section for transferring heat to the vaporization chamber, the heater, and a heat buffer between the heat transfer section and the heater are provided.
[0008]
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, becomes vaporized gas while being gradually heated, and burns in the jet burner. When the heater is energized and the vaporization chamber is preheated, the vaporizer chamber and the heat transfer section are heated by the heater and heat between the heater and the heat transfer section is provided by a thermal buffer provided between the heater and the heat transfer section. Heat generated by the heater with increased conduction resistance can be transferred to the vaporization chamber to heat the vaporization chamber faster, and when the heater is energized at the start of combustion, the vaporization chamber reaches a temperature at which fuel vaporization is possible. Time can be shortened. Next, when combustion is started, the combustion heat can heat the vaporization chamber with the combustion heat even if the energization to the heater is stopped by heating the vaporization chamber via the heat transfer section and the thermal buffer, Power consumption during combustion can be reduced.
[0009]
Further, by providing the heat transfer section, the heat capacity of the vaporizing chamber can be supplemented, and a temporary temperature drop of the vaporizing chamber that occurs when fuel is supplied to the vaporizing chamber can be suppressed, thereby stabilizing the vaporization.
[0010]
In addition, since the vaporizing chamber has a substantially flat shape, the inside of the vaporizing chamber can be heated to a high temperature, and deteriorated kerosene that has been stored for a long time and oxidized, and high-boiling dissimilar components are mixed in to increase the boiling point. Fuel can also be vaporized, and tarring of the altered kerosene in the vaporization chamber can be suppressed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A liquid fuel combustion apparatus according to claim 1 of the present invention comprises a burner for burning vaporized gas obtained by vaporizing liquid fuel, a substantially flat vaporization chamber having a nozzle portion at one end and a fuel supply port at the other end, and transfer heat heat recovery area of the combustion heat of the burner in the vaporizing chamber, and a heater, Bei give a thermal buffer member between the heater and the heat transfer portion, between the heat transfer portion and the heater The thermal conductivity is configured to be smaller than the thermal conductivity between the vaporizing chamber and the heater.
[0012]
Then, the liquid fuel supplied to the heated vaporizing chamber moves and diffuses in the vaporizing chamber from the fuel supply port side, becomes vaporized gas while being gradually heated, burns out from the nozzle portion and burns in the burner. When the heater is energized and the vaporization chamber is preheated, the vaporizer chamber and the heat transfer section are heated by the heater, but the heat buffer provided between the heater and the heat transfer section is used between the heater and the heat transfer section. Because the heat conduction resistance increases, a large amount of heat generated in the heater can be transferred to the vaporization chamber to heat the vaporization chamber quickly. After the heater is energized at the start of combustion, the vaporization chamber reaches the fuel vaporizable temperature. Time can be shortened. Next, when combustion is started, the combustion heat can heat the vaporization chamber with the combustion heat even if the energization to the heater is stopped by heating the vaporization chamber via the heat transfer section and the thermal buffer, Power consumption during combustion can be reduced. Further, by providing the heat transfer section, the heat capacity of the vaporizing chamber can be supplemented, and a temporary temperature drop of the vaporizing chamber that occurs when fuel is supplied to the vaporizing chamber can be suppressed, thereby stabilizing the vaporization.
[0013]
In addition, since the vaporizing chamber is configured to be substantially flat, the inside of the vaporizing chamber can be heated to a high temperature, and deteriorated kerosene that has been stored for a long period of time and high-boiling dissimilar components are mixed to increase the boiling point. The fuel can also be vaporized, and tarization of the altered kerosene in the vaporization chamber can be suppressed.
[0014]
According to a second aspect of the present invention, there is provided a liquid fuel combustion apparatus comprising: a burner for burning vaporized gas obtained by vaporizing liquid fuel; a burner receiving seat for mounting the burner; a nozzle portion at one end; A substantially flat vaporizing chamber having a mouth; a heat transfer portion connected to the burner receiving seat to transfer combustion heat of the burner to the vaporizing chamber; a heater; the heat transfer portion; and the heater. In the configuration, a heat buffer was provided between the two.
[0015]
Then, when the heater is energized to heat the vaporization chamber, the heater is heated at the start of combustion by heating the vaporization chamber and simultaneously heating the burner via the burner seat connected to the heat transfer portion and the heat transfer portion. The time to reach the fuel vaporizable temperature in the vaporization chamber after energization can be shortened, and the premixed gas ejected from the flame hole of the burner during ignition can be easily ignited to reduce white smoke and odor during ignition. be able to. Further, when combustion is started, the combustion heat can heat the vaporization chamber from the burner seat through the heat transfer section, so that it is not necessary to energize the heater and power consumption during combustion can be reduced.
[0016]
According to a third aspect of the present invention, there is provided a liquid fuel combustion apparatus in which a heater, a thermal buffer, and a heat transfer portion are provided on both sides of the flat vaporizing chamber on the wide side, and the wide side surface of the flat vaporizing chamber is provided. In a direction that easily absorbs the combustion heat of the burner.
[0017]
By providing the heaters on both sides of the vaporizing chamber, the time for the vaporizing chamber to reach the fuel vaporizable temperature after energizing the heater at the start of combustion can be shortened. Further, during combustion, since the vaporizing chamber is heated with combustion heat from both sides via the heat transfer portions provided on both sides of the vaporizing chamber, the center of the vaporizing chamber can be heated to a substantially uniform temperature.
[0018]
According to a fourth aspect of the present invention, there is provided a liquid fuel combustion apparatus in which a thermal buffer is disposed in a part between a heater and a heat transfer section.
[0019]
In addition, by directly heating the vaporization chamber and a part of the heat transfer section required at the start of combustion with the heater during preheating, it is possible to increase the rate of temperature rise, and the time from when the heater is energized until the start of combustion is increased. It can be shortened.
[0020]
In the liquid fuel combustion apparatus according to claim 5 of the present invention, the thermal buffer is provided on the flat upper surface facing the fuel supply port side of the vaporization chamber and the flat lower surface on the nozzle portion side of the vaporization chamber. It is a thing.
[0021]
In addition, by directly heating the vaporization chamber and the nozzle-side heat transfer section with a heater during preheating, the temperature rise rate near the fuel inlet in the vaporization chamber can be increased to enable vaporization of the fuel early after energization, and heat transfer By heating the burner early through the burner seat connected to the part, it is easy to ignite the premixed gas ejected from the flame outlet of the burner at the time of ignition, and reduce white smoke and odor at the time of ignition Can do.
[0022]
The liquid fuel combustion apparatus according to claim 6 of the present invention is configured so that the thermal buffer is used also as an electrical insulator between the heater and the heat transfer section. By constituting with one component, the number of components can be reduced.
[0023]
【Example】
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
[0024]
(Example 1)
1 is a cross-sectional view of a main 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. 3 is a bottom view of the vaporization section of the liquid combustion apparatus. .
[0025]
In FIG. 1 to FIG. 3, reference numeral 21 denotes a vaporizer, which is provided with a circular burner receiving seat 22 at an upper portion thereof, and a nozzle portion 23 is disposed at substantially the center of the burner receiving seat 22, and between the burner receiving seat 22 and the nozzle portion 23. An opening 24 through which combustion air flows is provided. Reference numeral 25 denotes a heat transfer portion which is integrally connected to the burner receiving seat 22. Reference numeral 26 denotes a vaporizing chamber which is substantially flat and has one end communicating with the nozzle portion 23 via the vaporized gas passage 27 and a fuel supply port 28 provided at the other end. Reference numeral 29 denotes a vaporizing element provided in the vaporizing chamber 26, and 30a and 30b are provided by heaters so as to sandwich the vaporizing chamber 26 from both sides. Reference numeral 31 denotes a heat buffer plate provided between the heater 30 a and the heat transfer section 25. Reference numeral 32 denotes a mixing tube located above the nozzle portion 23 and placed on the burner receiving seat 22, and 33 denotes a burner having a plurality of flame hole portions 34 provided on the lower peripheral wall. Reference numeral 35 denotes a fuel pump that supplies fuel to the vaporizing unit 21, 36 denotes a needle that opens and closes the nozzle unit 23, and 37 denotes a solenoid that drives the needle 36.
[0026]
Next, the operation and action 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 activated to supply fuel into the vaporization chamber 26 from the fuel supply port 28. The fuel supplied from the fuel supply port 28 into the vaporizing chamber 26 diffuses and moves in the pores of the vaporizing element 29 having a porosity while being heated toward the nozzle portion side, and gradually vaporizes from the low-boiling components in the fuel to liquidize. From the nozzle portion 23 via the vaporized gas passage 27. When the vaporized gas is ejected from the nozzle portion 23, primary air is sucked from the opening portion 24 by the ejector effect, and burns in the flame hole portion 34 via the burner 33 while mixing with the vaporized gas in the mixing tube 32. During 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 portion 25 provided integrally with the burner receiving seat 22 during combustion. the heating by the heater 30a to sustain the vaporized combustion only combustion heat becomes unnecessary.
[0027]
When the vaporization chamber 26 reaches a predetermined temperature and fuel supply is started, the heat capacity of the vaporization chamber 26 is small, so that the temperature temporarily decreases and a fuel vaporization failure may occur, but in this embodiment, Since the heat transfer section 25 is adjacent to the vaporizing chamber 26, the temperature drop is suppressed by the heat capacity of the heat transfer section 25, and stable vaporization can be obtained. Further, when the heater 30a, 30b is energized to heat the vaporizing chamber 26, if the heater 30a generates heat, the vaporizing chamber 26 is heated and the heat transfer section 25 is heated at the same time, but between the heater 30a and the heat transfer section 25, Since the thermal buffer 31 is provided in the heating chamber 30, the heat resistance between the heater 30 a and the heat transfer section 25 is greater than the thermal resistance between the heater 30 a and the vaporizing chamber 26, and the heat generated in the heater 30 a is generated in the vaporizing chamber 26. Therefore, the vaporization chamber 26 can be heated quickly. If there is no thermal buffer 31 at this time, if the heater 30a generates heat when energization is started, heat is dispersed to simultaneously heat the vaporizing chamber 26 and the heat transfer section 25, and the heating rate of the vaporizing chamber 26 is reduced. During combustion, the vaporizing chamber 26 is heated by the combustion heat through the heat transfer section 25. However, even if the thermal buffer 31 is interposed, the heating rate is slow, but the amount of heat is large, so the fuel in the vaporizing chamber 26 is vaporized. The amount of heat to do can be ensured. Further, in the process of vaporizing the fuel in the vaporizing chamber 26, if a low temperature portion exists in the fuel diffusion passage in the vaporizing chamber 26 and the built-in vaporizing element 29, a part of the fuel is completely vaporized in the vaporizing chamber 26. However, the tar generated for vaporization in the downstream nozzle portion 23 closes the vaporized gas ejection hole of the nozzle portion 23 and causes a reduction in the combustion amount. However, according to the configuration of this embodiment, the vaporization chamber 26 is flattened. Since it is configured, the inside is heated to a high temperature and no low temperature portion is generated, so that the fuel can be completely vaporized in the vaporizing chamber 26.
[0028]
(Example 2)
FIG. 4 is a longitudinal sectional view of an essential part showing a liquid fuel combustion apparatus according to Embodiment 2 of the present invention.
[0029]
The second embodiment is different from the first embodiment in that the heaters 30a and 30b, the thermal buffers 31a and 31b, and the heat transfer sections 25a and 25b are provided on both surfaces of the vaporizer 21. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0030]
Next, the operation and action will be described. The heaters 30a and 30b are energized, and the vaporizing chamber 26 reaches a predetermined temperature. A fuel pump (not shown) is activated to supply fuel from the fuel supply port 28 into the vaporizing chamber 26. The fuel supplied into the vaporizing chamber 26 from the fuel supply port 28 diffuses and moves in the pores of the vaporizing element 29 having a porosity toward the nozzle portion 23 side, and vaporizes from the low boiling point components in the fuel to liquidize. From the nozzle portion 23 via the vaporized gas passage 27.
[0031]
According to the configuration of this embodiment, since the substantially flat vaporizing chamber 26 is heated from both sides so as to be sandwiched between the heaters 30a and 30b at the start of operation, the temperature in the vaporizing chamber 26 can be vaporized from the start of energization. The time to reach can be further shortened. Further, since the heat received by the burner receiving seat 22 heats the vaporizing chamber 26 from both sides via the heat transfer portions 25a and 25b, the central portion of the vaporizing chamber 26 can be heated to a high temperature at a substantially uniform temperature. And tarring of the fuel can be further suppressed.
[0032]
Moreover, it is possible to abolish the insulating material on the heat transfer portions 25a and 25b side by using the heat buffer bodies 31a and 31b as electrical insulators between the heaters 30a and 30b and the heat transfer portions 25a and 25b. The number of parts can be reduced.
[0033]
(Example 3)
FIG. 5 is a longitudinal sectional view of a main part showing a liquid fuel combustion apparatus in Embodiment 3 of the present invention.
[0034]
In Example 3, differs from the second embodiment in that the partially provided between the thermal buffer member 31a, 31b pressurized thermal heater 30a, 30b and the heat transfer portion 25a, 25b. In addition, the thing of the same code | symbol as Example 2 is the same structure, and abbreviate | omits description.
[0035]
Next, the operation and action will be described. When the heaters 30a and 30b are energized and the vaporizing chamber 26 reaches a predetermined temperature, a fuel pump (not shown) is activated to supply fuel into the vaporizing chamber 26 from the fuel supply port 28. The fuel supplied into the vaporizing chamber 26 from the fuel supply port 28 diffuses and moves in the pores of the vaporizing element 29 having a porosity toward the nozzle portion 23 side, and vaporizes from the low boiling point components in the fuel to liquidize. From the nozzle portion 23 via the vaporized gas passage 27.
[0036]
According to the configuration of the present embodiment, the heat buffer 31a is between the heater 31a on the fuel supply port 28 side of the vaporization chamber 26 and the heat transfer section 25a, and the heat buffer 31b is a burner of the heat transfer body 25a. Since it is provided between the receiving seat 22 side and the heater 30b, when the heaters 30a and 30b are energized, the fuel supply port 28 side of the vaporizing chamber 26 and the heat transfer section 25a side are directly heated. Accordingly, the lower surface of the vaporization chamber 26 on the fuel supply port 28 side quickly reaches the fuel vaporizable temperature, and the burner receiving seat 22 integrally connected to the heat transfer section 25a is placed on the burner receiving seat 22 heated and heated quickly. By heating a burner (not shown), the vaporized gas can be ignited more easily.
[0037]
【The invention's effect】
As described above, the liquid fuel combustion apparatus according to claim 1 of the present invention directly heats the substantially flat vaporization chamber by the heater and heats the heat transfer section via the thermal buffer. The time from when the heater is energized at the start of operation until the vaporization chamber reaches the vaporization temperature of the fuel is shortened, and the combustion waiting time is short. During combustion, the vaporization chamber is heated with combustion heat via the heat transfer section , so that it is not necessary to energize the heater and power consumption can be reduced. The heat transfer section replenishes the heat capacity of the vaporizing chamber, suppresses a temporary temperature drop during fuel supply, and stable vaporization can be obtained. Since the inside of the vaporizing chamber can be heated, there is no low-temperature part, so fuel vaporization is promoted and tar generation can be suppressed.
[0038]
In the liquid fuel combustion apparatus according to claim 2, since the heat receiving part and the heat transfer part of the combustion heat are connected, in order to heat the vaporization chamber with the combustion heat via the heat transfer part during the combustion, the heater is used. Is unnecessary, and power consumption can be reduced. It can be reduced white smoke and odors when ignited by preheating the burner via the burner seat when the heater power.
[0039]
In addition, since the liquid fuel fuel device according to claim 3 is configured so that the vaporization chamber is sandwiched between the heaters from both sides, the heat conduction to the vaporization chamber is good and the heater is energized at the start of operation before the vaporization chamber is opened. The time required to reach the vaporization temperature of the fuel can be shortened and the interior of the vaporization chamber can be heated.
[0040]
Moreover, since the liquid fuel combustion apparatus concerning Claim 4 is set as the structure which provided the thermal buffer in a part between a heater and a heat-transfer part, the vaporization chamber required at the time of a combustion start by a heater at the time of preheating By directly heating a part of the heat transfer section, it is possible to increase the rate of temperature rise and shorten the time from when the heater is energized until the start of combustion.
[0041]
In the liquid fuel combustion apparatus according to claim 5 of the present invention, the thermal buffer is provided on the flat upper surface facing the fuel supply port side of the vaporization chamber and the flat lower surface on the nozzle portion side of the vaporization chamber. By heating the vaporization chamber and the heat transfer part on the nozzle side directly with a heater during preheating, it is possible to vaporize fuel early after energization and at the time of ignition by heating the burner early. It is possible to easily ignite the premixed gas ejected from the burner flame outlet.
[0042]
Moreover, the liquid fuel combustion apparatus according to claim 6 of the present invention is configured so that the thermal buffer is also used as an electrical insulator between the heater and the heat transfer section, and the number of parts can be reduced. [Short description of drawings]
FIG. 1 is a longitudinal sectional view of a main part of a liquid fuel combustion apparatus according to a first embodiment of the present invention. FIG. 2 is a top view of a vaporizer of the liquid fuel combustion apparatus. FIG. 4 is a longitudinal sectional view of a main part of a liquid fuel combustion apparatus according to a second embodiment of the present invention. FIG. 5 is a longitudinal sectional view of a main part of the liquid fuel combustion apparatus according to a third embodiment of the present invention. Longitudinal cross section of the combustion equipment
DESCRIPTION OF SYMBOLS 21 Vaporizer 22 Burner receptacle 23 Nozzle part 25, 25a, 25b Heat transfer part 26 Vaporization chamber 28 Fuel supply port 29 Vaporization element 30a, 30b Heating heater 31, 31a, 31b Thermal buffer 33 Burner

Claims (6)

A burner that burns vaporized gas obtained by vaporizing liquid fuel, a substantially flat vaporization chamber having a nozzle portion at one end and a fuel supply port for liquid fuel at the other end, and the combustion heat of the burner is transferred to the vaporization chamber. A heat transfer section, a heater, and a heat buffer between the heat transfer section and the heater, and the thermal conductivity between the heater and the heat transfer section is determined between the vaporization chamber and the heater. The liquid fuel combustion apparatus comprised so that it might become smaller than the heat conductivity between. A burner for burning vaporized gas obtained by vaporizing liquid fuel, a burner receiving seat on which the burner is placed, a substantially flat vaporizing chamber having a nozzle portion at one end and a fuel supply port for liquid fuel at the other end; A liquid connected to a burner seat and configured to include 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. Fuel combustion device.   A heater, a thermal buffer, and a heat transfer part are provided on both sides of the flat side vaporizing chamber, and the wide side surface of the flat type vaporizing chamber is configured in a direction that easily absorbs the combustion heat of the burner. The liquid fuel combustion apparatus according to claim 1 or 2.   The liquid fuel combustion apparatus according to any one of claims 1 to 3, wherein the thermal buffer is disposed in a part between the heater and the heat transfer section.   5. The liquid fuel combustion apparatus according to claim 4, wherein the thermal buffer is provided on a flat upper surface facing the fuel supply port side of the vaporization chamber and a flat lower surface on the nozzle portion side of the vaporization chamber.   The liquid fuel combustion apparatus according to any one of claims 1 to 5, wherein the thermal buffer is configured to also serve as an electrical insulator between the heater and the heat transfer section.

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