JPS6365212A - Vaporizing device for liquid fuel - Google Patents

Abstract

PURPOSE:To make it possible to vaporize a liquid fuel rapidly and surely by arranging a heater core with a solid center in a cylindrical body provided with heat receiving fins on the outer circumferential face and mounting a vaporized fuel injection pipe at one end of the cylindrical body and a fuel introducton pipe at the other end. CONSTITUTION:Electric current supply is passed through the resistance wire of a heater coil 4 and the resistance wire of a heater core 12 with a solid center to heat a cylindrical heater core 3, heater coil 4 and the heater core 12 wire a solid center, and at the same time a liquid fuel is supplied from a fuel introduction pipe 9. The liquid fuel is led through a liquid fuel introduction opening 14 of the liquid fuel introduction pipe 9 to fuel passage 8 from a fuel passing hole 13 and contacts the heater core 3 and heater coil 4 which are heater and the heat core with a solid center to be vaporized. Next, the vaporized fuel that was vaporized from the liquid fuel flows from a vaporized fuel injection section 15 through a vaporized fuel discharge pipe 6 and it is injected from an injection opening 7 into the vaporization chamber of a burner. When the combustion in the combustion chamber has fully progressed, the electric current supply to the heater coil 4 and the resistance wire 10 is stopped. After this the liquid fuel is vaporized by the radiation heat received by heat receiving fins from the combustion chamber.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to indirect combustion engines used in vehicles equipped with internal combustion engines, vehicles such as trailers, domestic rooms, drying rooms, offices, plastic greenhouses, and other rooms. Or, it is applied to a combustor that can be applied to a direct heating device, a drying device, a boiler, a water heater, etc., and relates to a liquid fuel vaporization device that vaporizes liquid fuel to generate vaporized fuel.

[Conventional technology]

Conventionally, for example, when heating a vehicle's interior, cooling water from an internal combustion engine is taken out through hot water piping and guided to a heater device.
Some devices heat the room by indirectly exchanging heat and blowing warm air into the room.

In addition, a heating system for an automobile (for example, Japanese Patent Laid-Open No. 6 (1-25201)
(Refer to Publication No. 8). Furthermore, an engine warm-up device (for example, an engine warm-up device designed to supply combustion gas from the combustor to the intake port of the engine via a heat exchanger and to guide air heated by the heat exchanger to the passenger compartment) 61-79864).

As prior art of liquid fuel vaporization devices, there are those disclosed in, for example, Japanese Patent Application No. 137837/1983, Japanese Patent Application No. 207330/1982, and Japanese Patent Application No. 281162/1982 filed by the present applicant.

First, what is described in Japanese Patent Application No. 60-137837 will be outlined with reference to FIGS. 2 and 3. The liquid fuel vaporization device 40 includes an outer pipe 47, an inner pipe 48, and a heating plug 45 such as a glow plug arranged in the inner pipe 48. The outer tube 47 is equipped with a plurality of nozzle holes 49 that open into the vaporization chamber, and a heat receiving body 41 is provided on the large-diameter closed end wall that projects into the combustion chamber.
is formed. As shown in FIG. 3, the heat receiving body 41 is provided with grooves 44 and has a large number of fins 43 formed therein.

The outer end of the inner tube 48 is threadedly supported on the outer end of the outer tube 47 via a heat insulating gasket 51 . The fuel supply pipe 46 is connected to the outer end of the inner pipe 48, while the inner end is connected to the heat receiving body 4.
A gap 50 is formed between the inner tube 48 and the outer tube 47.

The proximal end of the heating plug 45 is screwed into and supported by the threaded hole 42 provided at the outer end of the inner tube 48 , and the distal end side heating portion is connected to the heat receiving body 41 with a gap 50 between it and the inner tube 48 . protruded in the direction of

Further, what is described in Japanese Patent Application No. 60-207330 will be summarized with reference to FIG. In Figure 4,
A partition plate 52 having a plurality of notched passages 53 on the periphery of the inside of the combustion tube 59 allows air introduction holes 5 to be formed in the vaporization chamber 54 and the peripheral wall.
A combustor is disclosed that includes a fuel vaporizer 60 that is partitioned into a combustion chamber 56 having a combustion chamber 5, has a nozzle 57 for ejecting vaporized fuel that opens into the vaporization chamber 54, and has fins 58 on the outer peripheral surface. The fuel vaporizer 60 has a heating plug 61 such as a glow plug inserted into an outer tube 63, and a terminal 64 is provided at one end of the heating plug 61. Outer tube 6
The insertion of heating plug 61 into 3 is arranged such that a fuel passage 65 is formed. Further, the fuel supply vibro 2 is attached to the outer tube 63. The heating plug 61 has a solid structure, and has a resistance wire (not shown) made of tungsten embedded in a silicon nitride member.

Furthermore, what is described in Japanese Patent Application No. 59-281162 will be summarized with reference to FIG. In Figure 5,
The inside of the combustion tube 71 is partitioned into a vaporization chamber 67 and a combustion chamber 68 by seven honeycomb passages 69-7.

The upstream end of the vaporization chamber 67 has an outer peripheral wall 6 having an air introduction hole.
6 is installed. A rapid heating combustor is disclosed in which a vaporizer 70 is provided in an air duct 73 and obliquely disposed within a combustion cylinder 71, and has a jetting lower 2 that jets fuel from an upper part 74. The vaporizer 70 has an outer tube 76
A heating plug 75 such as a glow plug is inserted therein to form a fuel passage 77 . A terminal 79 is provided at one end of the heating plug 75, and a fuel supply pipe 78 is attached to the outer tube 76.

[Problem that the invention seeks to solve]

However, for indoor heating using the cooling water of the internal combustion engine, the temperature of the cooling water rises slowly, so it takes a long time for the heater body to send out hot air, and during that time the heater There is almost no heating function. In addition, for automotive heating systems or engine warm-up systems that use a combustor independent of the internal combustion engine, combustion cycles, exhaust gas processing, etc. require time and effort, and complex mechanisms and control devices are required. Moreover, it takes a long time to vaporize the liquid fuel, which causes a delay in ignition and combustion of the vaporized fuel.

Furthermore, although the liquid fuel vaporization device used in the combustor as a prior art is capable of vaporizing liquid fuel reliably and rapidly to a certain extent, it is still not sufficient. It is not possible to appropriately adjust the temperature of the combustor over a wide range depending on the condition of the combustor, which is unsatisfactory.

First of all, the patent application No. 1, Showa 60-1 shown in Figures 2 and 3.
Regarding the fuel vaporizer of the combustor described in No. 37837, after combustion becomes active, the fuel flowing into the outer pipe 47 from the end of the inner pipe 48 of the fuel vaporizer is heated and vaporized by the heat receiving body 41. Therefore, after the combustor starts operating, complete vaporization of the fuel is achieved even without energizing the heating plug, which helps reduce power consumption, improves fuel vaporization efficiency, and improves fuel ignition. However, the inner tube 4 inside the outer tube 47 is
8 is arranged, and a heating plug 45 which is a solid structure glow plug is arranged inside the inner tube 48, and the heat transfer area which is the heat radiation area of the heating plug 45 from which the liquid fuel obtains the heat of vaporization. Since the area is small, it is not possible to obtain sufficient heat of vaporization as the liquid fuel vaporizes, and there is room for improvement in the flow of the vaporized fuel. It is not always sufficient to eject vaporized fuel, and it also depends on the combustion state of the combustor,
There is a problem in that the temperature of the heating plug 45 cannot be adjusted over a wide range depending on the type of liquid fuel, etc., and is not always satisfactory.

Further, the fuel vaporizer 60 and vaporizer bag M70 used in the combustor described in Japanese Patent Application No. 60-207330 shown in FIG. 4 and Japanese Patent Application No. 59-281162 shown in FIG. Similarly to the vaporizer shown in FIG. 2, the heating plug 61 and the heating plug 75 are only of solid construction, and therefore, sufficient heat of vaporization cannot be obtained because the liquid fuel is vaporized. It is not necessarily sufficient to vaporize the liquid fuel rapidly and reliably and to eject the vaporized fuel from the vaporized fuel injection nozzle 57 and the injection lower 2.
Furthermore, there is a problem in that the temperature of the heating plug 45 cannot be adjusted depending on the combustion state of the combustor, the type of liquid fuel, etc., and is not always satisfactory.

The purpose of this invention is to solve the above problems, and is a liquid fuel vaporization device for use in a combustor that vaporizes fuel at a rapid rate and burns the vaporized fuel. The liquid fuel is rapidly and reliably vaporized to generate vaporized fuel, and the temperature of the heating plug is adjustable, so that the temperature of the heating plug can be adjusted depending on the type of liquid fuel, the combustion state of the combustor, etc. An object of the present invention is to provide a liquid fuel vaporization device that can adjust the fuel consumption to an optimum state.

[Means for solving problems]

In order to solve the above problems and achieve the above objects, the present invention is configured as follows.

That is, in the present invention, a cylindrical heater core is fitted into a cylindrical body provided with heat receiving fins on the outer peripheral surface, a solid heater core is arranged so as to form a fuel passage within the cylindrical heater core, and one end of the cylindrical body Regarding the liquid fuel vaporization device characterized in that a vaporized fuel injection pipe is attached to the cylinder body, and a fuel introduction pipe is attached to the other end of the cylinder body, more specifically,
The cylindrical heater core is made of ceramic and has a heater coil printed thereon, and a resistance wire is embedded in the solid heater core, and the heater coil and the resistance wire are connected in parallel or in series. Further, a fuel passage is formed in the cylindrical heater core at a portion where the fuel introduction pipe is attached, and the fuel passage and the passage of the fuel introduction pipe are in communication with each other, and the fuel passage is connected to the combustion chamber of the combustor. The present invention relates to a liquid fuel vaporization device that is used in a liquid fuel vaporization device, and is characterized in that the heater core functions as a vaporization glow plug in the combustor.

[Effect]

The liquid fuel vaporization device according to the present invention is constructed as described above and operates as follows. That is, in this liquid fuel vaporization device, a cylindrical heater core is fitted into a cylindrical body provided with heat receiving fins on the outer peripheral surface, a solid heater core is arranged so as to form a fuel passage within the cylindrical heater core, and a solid heater core is arranged so as to form a fuel passage within the cylindrical heater core. Since a vaporized fuel injection pipe is attached to one end of the body and a fuel introduction pipe is attached to the other end of the cylindrical body, the cylindrical heater core to which the heater coil is attached is hollow, and the inner periphery of the cylindrical body dissipates heat. At the same time as the heat transfer area becomes the heat transfer area, the solid heater core also becomes the heat transfer area, which is the heat radiation area, and the heat transfer area becomes extremely large, giving double heat and giving the liquid fuel sufficient heat of vaporization. Therefore, the liquid fuel is rapidly and reliably vaporized. Furthermore, a heater coil is printed and fixed to the cylindrical heater core, a resistance wire is embedded in the solid heater core, and the heater coil and the resistance wire are connected in parallel or in series. Therefore, the temperature of the heating plug consisting of the heater core and the solid heater core can be adjusted depending on the combustion state of the combustor, the type of liquid fuel, etc., and since the heat transfer area is large, the liquid fuel can be vaporized at low temperature. You can also do it.

[Embodiment] Hereinafter, an embodiment of a liquid fuel vaporization device according to the present invention will be described with reference to FIG.

In FIG. 1, a liquid fuel vaporizer according to the invention is indicated generally by the reference numeral 1. In FIG. In the liquid fuel vaporizer 1 according to the present invention, for example, air is taken in through an air cleaner of a diesel engine or a gasoline engine, a separate air cleaner, etc., or air is taken in directly from outside or indoors through an air intake pipe, and the air is combusted. Either the gas is sent directly into the room from the combustion gas delivery pipe, or a heat exchanger (
(not shown)

The structure of this liquid fuel vaporization device 1 will be explained with reference to FIG. 1. The liquid fuel vaporization device 1 has a heating plug, ie, a cylindrical heater core 3 and a solid heater core 12, which are vaporization glow plugs, etc., built into a metal vaporization pipe or cylindrical body 2. A large number of heat receiving fins 5 are formed on the outer peripheral surface of the cylinder 2. A vaporized fuel injection vibro is attached to one end of the cylinder 2, and a liquid fuel introduction pipe 9 is attached to the other end of the cylinder 2. A cylindrical heater core 3 is fitted into the cylindrical body 2, and the cylindrical body 2 and the cylindrical heater core 3 are in close contact with each other. The cylindrical heater core 3 has a cylindrical shape such as a cylinder, and the heater coil 4 is fixed by printing. A solid heater core 12 is inserted into the cylindrical heater core 3.
Therefore, a fuel passage 8 is formed between the cylindrical heater core 3 and the solid heater core 12. Solid heater core 1
A resistance wire 10 made of tungsten is embedded in 2. Further, a vaporized fuel injection portion 15 is formed at a downstream portion of the fuel passage 8 .

A fuel hole 13 is formed at the upstream end of the cylindrical heater core 3 near the liquid fuel inlet 14 of the liquid fuel inlet pipe 9 . Therefore, the fuel introduction pipe 9 and the fuel passage 8 in the cylindrical heater core 3 are in communication through the fuel passage hole 13. Cylindrical heater core 3 and solid heater core 1
Terminals 11 are provided at the base end portions of 2, respectively.

The material of the cylindrical heater core 3 and the solid heater core 12 is, for example, ceramic, silicon nitride material, etc.
The material of the heater coil 4 and the resistance wire 10 is, for example, a resistance wire made of tungsten. In the figure, arrows indicate the direction of fuel flow.

Next, an example of a combustor to which the liquid fuel vaporizer 1 according to the present invention is applied will be described. The combustor includes a ceramic combustion tube, a metal outer housing that covers the outer periphery of the ceramic combustion tube, and a metal lid plate that seals one end of the combustion tube and the outer housing. A metal combustion gas delivery pipe is provided at the lower end of the outer housing, and a metal air intake pipe is provided at the side of the cylindrical portion of the outer housing.

The inside of the combustion tube is partitioned into two chambers, namely, a vaporization chamber and a combustion chamber, by a partition plate having a plurality of openings, or notch passages, at its peripheral edge. A large number of air introduction holes are formed in the peripheral wall of the combustion cylinder constituting the combustion chamber. A combustion gas outlet is formed at the end of the combustion chamber opposite to the vaporization chamber, that is, at the bottom. The liquid fuel vaporization device 1 according to the present invention has, for example, as shown in FIG. 4 or FIG. It extends diagonally toward the hole and is installed through the communicating hole. Further, an ignition glow plug, which is a heating plug, is installed in the vaporization chamber. The ejection lower formed at the tip of the vaporized fuel ejection vibro is located near the ignition glow plug installed in the vaporization chamber.

The liquid fuel vaporizer 1 according to the present invention is constructed as described above and operates as follows.

In order to make the operation of the liquid fuel vaporizer 1 easier to understand, an example in which the liquid fuel vaporizer 1 is applied to the above-mentioned combustor will be described.

First, electricity is applied from the heating plug, which is a glow plug for vaporization in the cylindrical body 2, that is, the resistor 11 of the heater coil 4 of the cylindrical heater core 3, and the resistance wire 10 of the cylindrical heater core 3, the heater coil 4, and the solid heater core 12 is connected. While heating, liquid fuel is supplied from the fuel introduction pipe 9. The liquid fuel passes through the liquid fuel inlet 14 of the liquid fuel inlet pipe 9 and is guided from the fuel passage 13 to the fuel passage 8, where it is heated by the heater core 3.
and the resistance v of the heater coil 4 and solid heater core 12
It comes into contact with A10 and is vaporized. Next, the vaporized fuel is ejected from the vaporized fuel injection part 15 through the vaporized fuel injection vibro and from the injection lower into the vaporization chamber of the combustor. In this case, a small amount of oil droplets may be ejected mixed with the vaporized fuel at first, but these oil droplets have the function of making ignition extremely smooth when the vaporized fuel is ignited. On the other hand, combustion air is sent in from the air intake pipe, swirls in the annular space between the outer cylinder housing and the combustion cylinder, and is blown into the combustion chamber from the air introduction hole. A portion of the combustion air blown into the combustion chamber is sent into the vaporization chamber through a cutout passage that is an opening in the partition plate. The vaporized fuel and combustion air are mixed and homogeneously mixed to form a mixture, where the fuel is ignited by an ignition glow plug and combusted. Next, the vaporized fuel is ignited, combusted, and mixed with combustion air while being blown into the combustion chamber, where it is completely combusted. The combusted vaporized fuel becomes combustion gas and is sent to a heat exchanger or the like through a combustion gas delivery pipe from a combustion gas delivery port formed in the combustion tube.

When the combustion state in the combustion chamber becomes active, combustion heat, that is, radiant heat is received via a large number of heat receiving fins 5 provided on the cylindrical body 2 of the liquid fuel vaporizer 1. In this state, the supply of electricity to the heating plug, that is, the heater coil 4, which is the vaporizing glow plug of the liquid fuel vaporizing device 1, and the resistance wire 10 is stopped. Thereafter, the liquid fuel receives radiant heat from the combustion chamber and is transferred into the cylinder body 2, and the liquid fuel is vaporized in the cylinder body 2 by the transferred heat, that is, the heat of vaporization, and is turned into vaporized fuel. The gas is ejected into the vaporization chamber. The heater coil 4 and the resistance wire 10 can be connected in series or in parallel, and in either case, the temperature can be controlled over a large range of the heating plug.

For example, when increasing combustion in the combustor from the beginning, when it is desired to vaporize liquid fuel rapidly, or when using a type of liquid fuel that is difficult to vaporize, the heater coils of both cylindrical heater cores 3 4 and the resistance wire 10 of the solid heater core 12, and when liquid fuel that easily vaporizes is used, only one of the resistance wires 10 may be energized. Furthermore, when the combustion state of the combustor is weak, one of the heating plugs can be energized to promote vaporization of the liquid fuel.

Although the embodiments of the liquid fuel vaporizer according to the present invention have been described in detail above, the present invention is not necessarily limited to these details. For example, in the figure, the cylindrical heater core is fitted tightly to the cylinder, but it is not necessarily necessary to fit tightly, and it goes without saying that a gap may exist. Further, although the vaporized fuel injection pipe is formed in a dovetail shape, it can be formed in various shapes depending on the structure of the combustor. Although the fuel introduction pipe is installed at right angles to the cylinder, such installation is not necessarily limited to the structure, and may be installed in parallel or embedded in the cylinder. When the liquid fuel vaporization device is attached to a combustor, it can be formed into various shapes depending on the structure of the combustor. Further, although the cylinder, the heater core, and the vaporized fuel injection pipe are formed in a cylindrical shape, they may be formed in a stacked shape such as a rectangular tube shape or an elliptical tube shape. Of course, the end of the vaporized fuel injection pipe in the vaporized fuel injection part may be chamfered so that the vaporized fuel flows smoothly.

〔Effect of the invention〕

The liquid fuel vaporization device according to the present invention is configured as described above, and has the following effects.

That is, in this liquid fuel vaporization device, a cylindrical heater core is fitted into a cylindrical body provided with heat receiving fins on the outer peripheral surface, a solid heater core is arranged so as to form a fuel passage within the cylindrical heater core, and a solid heater core is arranged so as to form a fuel passage within the cylindrical heater core. Since a vaporized fuel injection pipe is attached to one end of the body and a fuel introduction pipe is attached to the other end of the cylindrical body, the cylindrical heater core to which the heater coil is attached is hollow, and the inner periphery of the cylindrical body dissipates heat. In addition to the heat transfer area, which is the area, the solid heater core also becomes the heat transfer area, which is the heat dissipation area, and the heat dissipation area is extremely large. Therefore, the liquid fuel can be vaporized rapidly and reliably, and the vaporized fuel can be smoothly ejected from the jet nozzle.Therefore, the liquid fuel can be vaporized rapidly and reliably, and the vaporized fuel can be vaporized quickly and reliably. The vaporized fuel can be immediately combusted and can be quickly used for heating, etc.Furthermore, a heater coil is printed on the cylindrical heater core, and a resistance wire is attached to the solid heater core. The heater coil and the resistance wire are connected in parallel or in series, so that depending on the combustion state of the combustor, the type of liquid fuel, etc., the heating plug consists of the cylindrical heater core and the solid heater core. The temperature of the liquid fuel vaporizer can be adjusted, and the liquid fuel can be vaporized at low temperatures.Furthermore, the structure is extremely simple, and the liquid fuel vaporization device itself can be easily assembled and installed in the combustor. Maintenance is easy.In addition, regarding the fuel supply to the liquid fuel vaporizer, in order to sequentially generate the amount of vaporized fuel necessary for combustion, the optimum amount of liquid fuel is supplied to the liquid fuel vaporizer through the fuel introduction pipe. Moreover, since the liquid fuel is vaporized in the early stage of combustion, it can be controlled by disconnecting and disconnecting the heater coil, which is extremely desirable from the standpoint of safety. It is.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a liquid fuel vaporization device according to the present invention, FIG. 2 is a cross-sectional view showing an example of a fuel vaporization device used in a combustor according to the prior art, and FIG. 4 is a sectional view showing an example of a vaporizer used in a combustor according to the prior art, and FIG. 5 is a plan view showing an example of a vaporizer used in a combustor according to the prior art. It is a sectional view showing an example. 1---1---liquid fuel vaporization device, 2---cylindrical body, 3
- Cylindrical heater core, 4- Heater coil, 5- Heat receiving fin, 6- Vaporized fuel injection pipe, 7---- Jet outlet, 8---- Fuel passage, 9---- Fuel introduction pipe, 1
(1-----Resistance wire, 11--Terminal, 12--Solid heater core, 13----Fuel hole, 14------
Fuel inlet, 15----jet part, 16----one end. Patent Applicant Isu Jidosha Co., Ltd. Agent Patent Attorney O Naka - Sosen 2 Figure 3 Figure 44 4j

Claims (8)

[Claims] (1) A cylindrical heater core is fitted into a cylindrical body provided with heat receiving fins on the outer peripheral surface, a solid heater core is arranged to form a fuel passage within the cylindrical heater core, and one end of the cylindrical body is provided with vaporized fuel. 1. A liquid fuel vaporization device, characterized in that an ejection pipe is attached, and a fuel introduction pipe is attached to the other end of the cylindrical body. (2) The liquid fuel vaporizer according to claim 1, wherein a heater coil is printed on the cylindrical heater core, and a resistance wire is embedded in the solid heater core. (3) The liquid fuel vaporizer according to claim 1, wherein the cylindrical heater core is made of ceramic. (4) The liquid fuel vaporization device according to claim 2, wherein the heater coil and the resistance wire are connected in parallel. (5) The liquid fuel vaporizer according to claim 2, wherein the heater coil and the resistance wire are connected in series. (6) A fuel passage is formed in the cylindrical heater core at a portion where the fuel introduction pipe is attached, and the fuel passage and the passage of the fuel introduction pipe are in communication with each other. The liquid fuel vaporization device according to scope 1. (7) The liquid fuel vaporization device according to claim 1, which is used by being placed in a combustion chamber of a combustor. (8) The liquid fuel vaporization device according to claim 7, wherein the cylindrical heater core functions as a vaporization glow plug in the combustor.