JPS6365211A - Vaporizing device for liquid fuel - Google Patents

Abstract

PURPOSE:To make it possible to vaporize a liquid fuel rapidly and surely and prevent the attaching of carbon on a cylindrical body by arranging a cylindrical heater core in the cylinder body provided with heat receiving fine made on its outer circumferential face and mounting a vaporized fuel injection pipe at one end of the cylindrical body and mounting a vaporized fuel introduction pipe on the other end. CONSTITUTION:Electric current is passed through the resistance wire of the heater coil 4 in a heater core 3 mounted in a cylindrical body 2 from a terminal 11 to heat the heater core 3, and at the same time a liquid fuel is supplied from a fuel introduction pipe 9. The liquid fuel is led from a fuel flow passage 8 and fuel flow hole 13 to a fuel flow passage 10 and contacts the heated heater core 3 to be vaporized. Many holes 12 formed at the tip end of the heater core 3 performs the function of heat exchange, and the vaporized fuel generated from the liquid fuel enters or leaves the holes 12 and then vaporized fuel passes through a fuel injection pipe 6 from a vaporized fuel injection section 15 and it is exhausted from an exhaust opening 7 into the vaporization chamber of a burner. When the combustion in the combustion chamber has been fully developed, the electric current supply to the heater coil 4 is stopped. Then the liquid fuel is vaporized by the radiation heat of the heat received from the combustion chamber by the heat receiving fins 5 provided on the cylindrical body 2.

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. The present invention also relates to a liquid fuel vaporization device that vaporizes liquid fuel used in a combustor and generates vaporized fuel, which can be applied to direct heating devices, drying devices, boilers, water heaters, and the like.

[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 that heats the room by the amount of heat generated by burning fuel in a burner, that is, a combustor, regardless of the internal combustion engine (for example, Japanese Patent Laid-Open No. 60-252018
(see publication). 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, for example, Japanese Patent Application No. 60-137837 and Japanese Patent Application No. 60-207330 filed by the present applicant.
There are some disclosed in Japanese Patent Application No. 59-281162, etc.

What is described in Japanese Patent Application No. 137837/1983 will be summarized with reference to FIGS. 3 and 4.

The liquid fuel vaporization device 40 includes an outer pipe 47, an inner pipe 48, and an inner pipe 4.
It consists of a heating plug 45 such as a glow plug placed at 8. The outer tube 47 has a plurality of nozzle holes 49 that open to the vaporization chamber.
A heat receiving body 41 is formed on a large diameter closed end wall protruding into the combustion chamber.

As shown in FIG. 4, 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 . A fuel supply pipe 46 is provided at the outer end of the inner pipe 48.
are connected, while the inner end of the inner tube 48 extends close to the heat receiving body 41, and there is a gap 50 between the inner tube 48 and the outer tube 47.
is formed. A screw hole 4 provided at the outer end of the inner tube 48
The proximal end portion of the heating plug 45 is screwed and supported by the heating plug 2 , and this distal heating portion is projected toward the heat receiving body 41 with a gap 50 between it and the inner tube 48 .

Further, what is described in Japanese Patent Application No. 60-207330 will be summarized with reference to FIG. In Figure 5,
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 vaporization device 60 that is partitioned into a combustion chamber 56 having a combustion chamber 5 and a combustion chamber 56, and 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 vaporization bag '1160 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. The insertion of the heating plug 61 into the outer tube 63 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 6,
The inside of the combustion tube 71 is partitioned into a vaporization chamber 67 and a combustion chamber 68 by a honeycomb passage 69. An outer peripheral wall 66 having an air introduction hole is attached to the upstream end of the vaporization chamber 67. A jet is provided in the air duct 73 and disposed obliquely within the combustion cylinder 71, and jets out fuel from the upper part 74.
A rapid heating combustor is disclosed which is provided with a vaporizer 70 having the following characteristics. In the vaporizer 70, a heating plug 75 such as a glow plug is inserted into an outer tube 76 so as 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. Furthermore, it takes time to vaporize the liquid fuel, which causes a delay in ignition and combustion of the vaporized fuel.

Furthermore, although the prior art vaporizer used in the above-mentioned combustor can reliably and rapidly vaporize liquid fuel to a certain extent, it is still not sufficient, and it is not possible to vaporize liquid fuel to a certain extent. This has the problem that undesirable conditions such as carbon adhesion occur. Next, problems with the prior art will be explained.

First of all, the patent application No. 1, Showa 60-1 shown in Figures 3 and 4.
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 in the inner tube 48. The heating plug 45 has a small heat radiation area for the liquid fuel to obtain vaporization heat, and the liquid fuel The fuel passage for the fuel is also only one annular passage, and as a result, it is not possible to obtain sufficient heat of vaporization as the liquid fuel vaporizes.There is also room for improvement in the flow of the vaporized fuel. It is not always sufficient to vaporize the fuel reliably and eject the vaporized fuel from the nozzle hole 49, and there is also the problem that carbon adheres to the heating plug 45, inner tube 48, and outer tube 47 located downstream of the fuel passage. It has points.

Further, the fuel vaporizer 60 and vaporizer 70 used in the combustor described in Japanese Patent Application No. 60-207330 shown in FIG. 5 and Japanese Patent Application No. 59-281162 shown in FIG. Similarly to the liquid fuel vaporizer 40 shown in FIG. Since the liquid fuel is vaporized, it is not possible to obtain sufficient heat of vaporization at low temperatures, and the liquid fuel is vaporized quickly and well, and the vaporized fuel is ejected from the vaporized fuel injection nozzle 57 and the injection lower 2. This is not necessarily sufficient, and there is a further problem in that carbon adheres to the heating plug 61 and outer tube 63, as well as the heating plug 75 and outer tube 76, which are located downstream of the fuel passage.

The purpose of this invention is to solve the above problems, and is a liquid fuel vaporizer for use in a combustor that vaporizes fuel at a rapid rate and burns the vaporized fuel. Sufficient heat of vaporization is applied to the liquid fuel while maintaining the temperature at a low temperature, for example, approximately 400°C to 500°C, to rapidly and effectively vaporize the liquid fuel to produce a vaporized fuel, and at the heating plug and its vicinity. It is an object of the present invention to provide a liquid fuel vaporization device that can prevent carbon from adhering.

[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 arranged so as to form a fuel passage within a cylinder having heat receiving fins on the outer peripheral surface,
A vaporized fuel injection pipe is attached to one end of the cylindrical body, a fuel introduction pipe is attached to the other end of the cylindrical body, and a large number of holes or protrusions are formed in the heater core located downstream of the fuel passage. Regarding the liquid fuel vaporizing device characterized by: To be more specifically detailed, a heater coil is disposed in the heater core located upstream of the fuel passage, and the heater coil is printed on the heater core made of ceramic. A fuel passage is formed in the heater core at a portion where the fuel introduction pipe is attached, and the fuel passage and the inside of the heater core communicate with each other. The present invention relates to a liquid fuel vaporization device used in the present invention, wherein 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 arranged so as to form a fuel passage inside a cylindrical body provided with heat receiving fins on the outer peripheral surface, a vaporized fuel injection pipe is attached to one end of the cylindrical body, and a vaporized fuel injection pipe is attached to one end of the cylindrical body. Since the fuel introduction pipe is attached to the other end of the body, the heater core to which the heater coil is attached is cylindrical, and the inner and outer peripheries of the cylindrical shape serve as heat transfer areas that are heat radiation areas, and the heater core is heated to a low temperature, e.g. When the temperature is maintained at about 400° C. to 500° C., sufficient heat of vaporization can be applied to the liquid fuel, and the liquid fuel can be vaporized rapidly and reliably. Further, since the heater coil is disposed at the upstream side of the heater core and a large number of holes or protrusions are formed at the downstream side of the fuel injection part, these perform a heat exchange function, and the vaporized fuel is transferred to the injection outlet. The heating plug and the cylindrical body are not covered with carbon.

〔Example〕

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 this liquid fuel vaporization device 1, 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.
Combustion gas is sent directly into the room from the combustion gas delivery pipe, or a heat exchanger installed downstream (not shown)
It is used in combustors that send out

The structure of this liquid fuel vaporization device 1 will be explained with reference to FIG. 1. The liquid fuel vaporizing device 1 has a heating plug, ie, a heater core 3, such as a vaporizing glow plug, built into a metal vaporizing pipe, ie, a cylindrical body 2. A large number of heat receiving fins 5 are formed on the outer peripheral surface of the cylinder 2. Cylindrical body 2
A vaporized fuel injection vibro is attached to one end of the cylindrical body 2, and a liquid fuel introduction pipe 9 is attached to the other end of the cylindrical body 2.

A heater core 3 is inserted into the cylinder 2, and an annular fuel passage 8 is formed between the cylinder 2 and the heater core 3. The heater core 3 has a cylindrical shape such as a cylinder,
Moreover, the heater coil 4 is fixed by printing. A large number of holes 12 are formed at the downstream end of the fuel passage 8 , that is, at the tip of the heater core 3 in the vaporized fuel injection section 15 .

The heater coil 4 is not printed on the tip of the heater core 3, but is printed on an upstream portion (including an intermediate portion) of the heater core 3. A fuel hole 13 is formed at the upstream end of the heater core 3 near the liquid fuel inlet 14 of the liquid fuel inlet pipe 9 . Therefore, the fuel passage 8 and the fuel passage 10 in the heater core 3 are in communication through the fuel passage hole 13. Furthermore, a terminal 11 is provided at the base end of the heater core 3. The material of the heater core 3 is, for example, ceramic, a silicon nitride member, etc., and the material of the heater coil 4 is, for example, a resistance wire made of tungsten. In the figure, arrows indicate the direction of fuel flow.

In FIG. 2, another embodiment of a liquid fuel vaporizer 1 according to the invention is shown. Regarding the liquid fuel vaporizer 1 shown in FIG. 2, instead of forming a large number of holes 12 at the tip of the heater core 3 in the liquid fuel vaporizer 1 shown in FIG. Protrusion 16
, and the other configurations are exactly the same. Therefore, a description of the same configuration will be omitted.

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 delivery port is formed at an end or lower portion of the combustion chamber opposite to the vaporization chamber. The liquid fuel vaporization device 1 according to the present invention includes, for example, as shown in FIG. 5 and FIG. It extends diagonally toward the hole and is installed through the communication hole. Further, an ignition glow plug, which is a heating plug, is installed in the vaporization chamber. Then, an ejection lower formed at the tip of the vaporized fuel ejection vibro is positioned 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 more clearly understand the operation of the liquid fuel vaporizer 1 according to the present invention, an example in which the liquid fuel vaporizer 1 is applied to the combustor will be described.

First, electricity is applied from the terminal 11 to the heating plug, which is a vaporizing glow plug in the cylinder body 2, or the resistance wire of the heater coil 4 of the heater core 3, to heat the heater core 3, and at the same time, liquid fuel is supplied from the fuel introduction pipe 9. The liquid fuel is guided from the fuel passage 8 and the fuel passage 13 to the fuel passage 10, contacts the heated heater core 3, and is vaporized. A large number of holes 12 formed at the tip of the heater core 3 function as a heat exchanger.
The vaporized fuel flows in and out of the hole 12, and then 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 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 the cutout passage, which is the opening of the partition plate. The vaporized fuel and the combustion air are mixed and homogeneously mixed to form a mixture, where the fuel is ignited by the ignition glow plug and combusted. Then, 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 a combustion gas and is sent to a heat exchanger or the like from the combustion gas delivery port formed in the combustion tube through the combustion gas delivery pipe. 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 vaporizing glow plug, that is, the heater coil 4 of the liquid fuel vaporizing device 1 is stopped. Thereafter, the heat receiving fins 5 receive radiant heat from the combustion chamber and transfer it to the fuel passage 8 in the cylinder body 2 as vaporization heat, and the liquid fuel is vaporized in the cylinder body 2 to become vaporized fuel, and the vaporized fuel jetting vibrator The gas is then ejected into the vaporization chamber.

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, a large number of holes are formed at the tip of the heater core, but they do not necessarily have to be holes.Protrusions are formed to perform the function of heat exchange, as shown in Figure 2. Of course, this is a good thing. When protrusions are formed, almost the same effect as shown in FIG. 1, ie, the effect on heat exchange, is achieved. Furthermore, although the heat receiving fins formed on the cylinder are formed in the circumferential direction of the cylinder, they do not necessarily have to be formed in the circumferential direction of the cylinder. (It goes without saying that the shape may be changed depending on the structure of the combustor in which the liquid fuel vaporization device is installed.Furthermore, the vaporized fuel injection pipe may be formed in a dovetail shape.) However, it is also possible to form it into various shapes depending on the structure of the combustor.Although the fuel introduction pipe is attached at right angles to the cylinder, such attachment is not necessarily limited to the structure. It may be installed in parallel or embedded in a cylindrical body.
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 can be formed in various shapes such as a rectangular cylinder shape and an elliptical cylinder shape. It goes without saying that the end of the vaporized fuel injection pipe in the vaporized fuel injection section 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, heat receiving fins are formed on the outer circumferential surface of the cylinder, a cylindrical heater core having a fuel vaporization heater coil is arranged so as to form a fuel passage inside the cylinder, and Since a vaporized fuel injection pipe is attached to one end and a fuel introduction pipe is attached to the other end of the cylindrical body, the heater core to which the heater coil is attached is cylindrical, and the inner and outer peripheries of the cylindrical shape are heat radiation areas. The heat transfer area is , and the heater core is heated to a low temperature, e.g.
When the liquid fuel is maintained at 00°C, sufficient heat of vaporization is applied to the liquid fuel. The liquid fuel is rapidly vaporized and becomes vaporized fuel. The heater coil is disposed at a portion of the heater core located upstream (including an intermediate portion) of the fuel passage,
Since a large number of holes or protrusions are formed in the portion of the heater core located near the fuel injection portion, that is, on the downstream side of the fuel passage, the function of heat exchange can be sufficiently performed, and the vaporized fuel is The water is ejected smoothly from the ejection port, and carbon does not adhere to the heating plug and the cylindrical body. Therefore, the liquid fuel can be vaporized rapidly and satisfactorily, and the vaporized fuel can be completely combusted, and the vaporized fuel can be immediately combusted, and can be quickly used for heating or the like. Further, the structure is extremely simple, and the liquid fuel vaporization device itself can be easily assembled and attached to the combustor, and maintenance etc. are easy. Furthermore, regarding the fuel supply to the liquid fuel vaporizer, in order to sequentially generate only the amount of vaporized fuel necessary for combustion, the liquid fuel vaporizer is configured to supply an optimum amount of liquid fuel 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, and has various effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of a liquid fuel vaporization device according to the present invention, FIG. 2 is a sectional view showing another embodiment of the liquid fuel vaporization device according to the invention, and FIG. 3 is a sectional view showing a prior art combustion FIG. 4 is a plan view showing the heat receiving body of FIG. 3, and FIG. 5 is another example of a prior art vaporization device used in a combustor. and FIG. 6 is a cross-sectional view showing still another example of a vaporizer used in a combustor according to the prior art. 1-------Liquid fuel vaporization device, 2-cylindrical body, 3-heater core, 4-heater coil, 5-heat receiving fin, 6
---- Vaporized fuel injection pipe, 7 injection port, 8- fuel passage, 9-- fuel introduction pipe, 10-- fuel passage, 11
- Terminal, 12 hole, 13--fuel hole, 14----
Fuel inlet, 15- spout, 16---- protrusion.

Claims (7)

[Claims] (1) A cylindrical heater core is arranged so as to form a fuel passage within a cylinder provided with heat receiving fins on the outer peripheral surface, a vaporized fuel injection pipe is attached to one end of the cylinder, and a fuel injection pipe is attached to the other end of the cylinder. A liquid fuel vaporization device characterized in that an introduction pipe is attached and a large number of holes or protrusions are formed in the heater core located downstream of the fuel passage. (2) The liquid fuel vaporization device according to claim 1, wherein a heater coil is disposed in the heater core located upstream of the fuel passage. (3) The liquid fuel vaporizer according to claim 1, wherein the heater core is made of ceramic. (4) The liquid fuel vaporization device according to claim 2, wherein the heater coil is printed on the heater core. (5) A fuel passage is formed in the heater core at a portion where the fuel introduction pipe is attached, and the fuel passage and the fuel passage in the heater core are in communication with each other. The liquid fuel vaporization device according to item 1. (6) The liquid fuel vaporization device according to claim 1, which is used by being placed in a combustion chamber of a combustor. (7) The liquid fuel vaporization device according to claim 6, wherein the heater core functions as a vaporization glow plug in the combustor.