JPS6365213A - Vaporizing device for liquid fuel - Google Patents

Abstract

PURPOSE:To make it possible to vaporize a liquid fuel rapidly and surely by fitting an inner cylinder which is provided with heat radiation fins on its inner circumferential face into a cylinder body which is provided with heat receiving fins on its outer circumferential face, inserting a heating plug into the inner cylinder and mounting a vaporized fuel nozzle on one end of the cylinder body and a fuel introduction pipe on the other end thereof. CONSTITUTION:An electric current supply is passed through the resistor wire in a heating plug 10 to heat the resistor wire and at the same time a liquid fuel is supplied from a fuel introduction pipe 9. The liquid fuel is led to a fuel passage 8 from a liquid fuel introduction opening 14 of the liquid fuel introduction pipe 9, and the liquid fuel comes in contact with the heating plug 10 to be vaporized. This vaporized fuel passes from a vaporized fuel injection section 15 through a vaporized fuel injection pipe 6 to be injection into the vaporization chamber of a burner from an injection opening 7. When the combustion becomes fully developed in the combustion chamber, the electric current supply to the heating plug 10 is shut off. Then a liquid fuel vaporization device 1 receives the combustion heat, namely radiation heat from the combustion chamber through heat receiving fins 5 and the heat is radiated to the fuel passage 8 from heat radiation fins 4 on an inner cylinder 3 to vaporize the liquid fuel.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to indirect or The present invention 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 a vehicle 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 No.). Furthermore, an engine warm-up device (for example, Japanese Patent Application Laid-Open No. 61-111) that supplies combustion gas from the combustor to the engine's intake boat through a heat exchanger and guides the air heated by the heat exchanger to the conductor. -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. 281162/1983 filed by the present applicant.

First, the components described in Japanese Patent Application Nos. 1983-137837 will be outlined with reference to FIGS. 3 and 4. 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. 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 gas get 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 screw 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 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 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 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 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. 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,
Further, 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.

In addition, although the liquid fuel vaporization device used in the above-mentioned combustor as a prior art is capable of vaporizing liquid fuel reliably and rapidly to a certain extent, it is still not sufficient. The radiant heat of the combustion chamber does not satisfactorily vaporize difficult or low grade liquid fuels. 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, the heating tap must be energized (although complete vaporization of the fuel is achieved, which helps reduce power consumption, improves the efficiency of fuel vaporization, and improves ignition of the fuel. However, the inner tube 4 inside the outer tube 47 is
8 is arranged, and a heating plug 45, which is a glow plug with a solid structure, is arranged in the inner tube 48, and the heat radiation area of the heating plug 45 for obtaining vaporization heat of the liquid fuel is small, Since the liquid fuel is vaporized, it is not possible to obtain sufficient heat of vaporization, and there is room for improvement in the flow of the vaporized fuel.
It is not always sufficient to eject vaporized fuel from the nozzle holes 49, and in particular, for liquid fuel that is difficult to vaporize, that is, low grade liquid fuel, the heat receiving body 41 at the tip alone cannot sufficiently receive the radiant heat from the combustion chamber. Further, there is a problem in that the received heat cannot be effectively radiated to the fuel passage, and the vaporization of the liquid fuel is not necessarily satisfactory.

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. Regarding, the heating plug 61 and the heating plug 75 have a solid structure, and the fuel vaporizing device 60 has fins 58 on the outer peripheral surface or has no fins,
Similar to the vaporizer shown in FIG. 2, it is not possible to sufficiently receive radiant heat from the combustion chamber and radiate the received heat effectively to the fuel passage. It is not always possible to obtain heat, vaporize the liquid fuel quickly and reliably, and cause the vaporized fuel to be ejected from the vaporized fuel injection nozzle 57 and the injection lower 2, which is a problem. .

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 structure is configured to rapidly and reliably vaporize liquid fuel to generate vaporized fuel, and to balance the reception of radiant heat from the combustion chamber of the combustor and the heat dissipation within the vaporizer, especially for low grade liquid fuel. An object of the present invention is to provide a liquid fuel vaporizing device suitable for vaporizing liquid fuel.

[Means for Solving the 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, an inner cylinder having heat-radiating fins on the inner peripheral surface is press-fitted into a cylinder having heat-receiving fins on the outer peripheral surface, and a heating plug is inserted into the inner cylinder to form a fuel passage. , a liquid fuel vaporizer characterized in that a vaporized fuel injection pipe is attached to one end of the cylinder, and a fuel introduction pipe is attached to the other end of the cylinder. The radiation fins formed on the inner circumferential surface of the inner cylinder extend in the longitudinal direction of the inner cylinder, the inner cylinder is made of a metal sleeve, and the heating plug is arranged in a combustion chamber of a combustor for use. The present invention relates to a liquid fuel vaporization device that 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, an inner cylinder having heat radiation fins on the inner circumferential surface is press-fitted into a cylinder body having heat receiving fins on the outer circumferential surface, and a heating plug is fitted so as to form a fuel passage in the inner cylinder. was inserted, a vaporized fuel injection pipe was attached to one end of the cylindrical body, and a fuel introduction pipe was attached to the other end of the cylindrical body, so that combustion heat, which is radiant heat given to the heat receiving fins from the combustion chamber of the combustor, The heat radiation fins of the inner cylinder sufficiently receive the heat and radiate the heat to the fuel passage, in other words, heat reception and heat radiation are balanced, and the liquid fuel is in a state where sufficient vaporization heat is given, making the liquid fuel, especially difficult to vaporize. Liquid fuels, ie low grade liquid fuels, are efficiently vaporized, so that the liquid fuels are vaporized quickly and reliably. Further, since the radiation fins formed on the inner circumferential surface of the inner cylinder extend in the longitudinal direction of the inner cylinder, the flow of fuel is not obstructed.
The vaporized fuel is also smoothly ejected from the vaporized fuel injection pipe.

〔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 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. The liquid fuel vaporization bag M1 has a heating plug, such as a vaporization glow plug, built into a metal vaporization pipe, that is, a cylinder 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. The inner cylinder 3 is press-fitted into the cylinder 2, and the cylinder 2 and the inner cylinder 3 are in close contact with each other. The outer circumferential surface of the inner tube 3 has a complementary shape to the inner circumferential surface of the cylinder body 2, and has a cylindrical shape, for example, a cylindrical shape. Further, a large number of heat radiation fins 4 are formed on the inner circumferential surface of the inner cylinder 3. The radiation fins 4 extend in the longitudinal direction of the inner cylinder 3. A heating plug 10 , which is a solid heater core or glow plug, is inserted into the inner cylinder 3 so as to form a fuel passage 8 . The heating plug 10 is made of, for example, a ceramic, silicon nitride member, etc., and a resistance wire (not shown) made of tungsten is embedded or printed and bonded thereto. Further, a vaporized fuel injection portion 15 is formed at a downstream portion of the fuel passage 8 . A liquid fuel inlet 14 of the liquid fuel inlet pipe 9 communicates with the fuel passage 8 . A terminal 11 is provided at the base end of the heating plug 10.

The ejection lower of the vaporized fuel ejection vibro is normally installed and applied so as to open into the vaporization chamber of the combustor.

In the figure, arrows indicate the direction of fuel flow.

FIG. 2 is a sectional view taken along line nn in FIG. 1. The cylinder body 2 and the inner cylinder 3 are tightly press-fitted, and a heating plug 10 is inserted into the center of the inner cylinder 3 so as to form a fuel passage 8. Heat receiving fins 5 formed on the outer peripheral surface of the cylinder 2
are formed in the circumferential direction of the cylindrical body 2. In addition, the inner cylinder 3
The radiation fins 4 formed on the inner circumferential surface of the inner cylinder 3 are formed in the longitudinal direction of the inner cylinder 3.

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 an end of the combustion chamber opposite to the vaporization chamber. The liquid fuel vaporization device 1 according to the present invention has, for example, as shown in FIG. 5 or 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 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, the heating plug lO, which is the vaporizing glow plug inside the cylinder body 2,
The resistance wire (not shown) is energized from the terminal 11, and the heating plug 1
0 resistance wire is heated, and liquid fuel is supplied from the fuel introduction pipe 9. The liquid fuel is led from the liquid fuel inlet 14 of the liquid fuel inlet pipe 9 to the fuel passage 8, contacts the heated heating plug 10, 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. It is fed into the combustion chamber through the blow passage and into the vaporization chamber. 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. The vaporized fuel is then ignited and combusted and mixed with combustion air while
It is blown out 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, radiant heat is received through a large number of heat receiving fins 5 provided on the cylinder body 2 of the liquid fuel vaporizer 1. In this state, the supply of electricity to the resistance wire of the heating plug 10, which is the vaporizing glow plug of the liquid fuel vaporizing device 1, is stopped. After that, the liquid fuel vaporizer 1 receives combustion heat, that is, radiant heat, from the combustion chamber through the heat receiving fins 5,
Heat is radiated from the heat radiation fins 4 of the inner cylinder 3 to the fuel passage 8.

Therefore, the radiant heat from the combustion chamber is transferred to the heat receiving fins 5 and the heat dissipating fins 4, and is radiated to the fuel passage 8, and the liquid fuel is vaporized by the heat, that is, the heat of vaporization, and is produced into vaporized fuel. Fuel passes through the fuel passage 8 and is injected into the vaporization chamber from the vaporized fuel injection vibro. Further, even if the combustion in the combustor becomes active, if it is desired to vaporize the liquid fuel rapidly, or if the liquid fuel is of a type that is difficult to vaporize, the heating plug 10 of the liquid fuel vaporizer 1 may be used. Of course, the operation may be continued without stopping the current supply to the resistance wire. Furthermore, even when the combustion state of the combustor is weak, the resistance wire of the heating plug 10 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 heat receiving fins formed on the outer peripheral surface of the cylinder are formed in the circumferential direction of the cylinder.
Of course, it is not necessary to form it in the circumferential direction of the cylindrical body, and it is also possible to form it in the longitudinal direction of the cylindrical body. In addition, the vaporized fuel injection pipe is formed in a dovetail shape,
It is also possible to form it into 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 body, inner cylinder, and vaporized fuel injection pipe are formed in a cylindrical shape, they can also be formed in a stacked shape such as a rectangular cylinder shape or an elliptical cylinder shape, and the same applies to the shape of the heating plug. be. Furthermore, 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, an inner cylinder having heat radiation fins on the inner circumferential surface is press-fitted into a cylinder body having heat receiving fins on the outer circumferential surface, and a heating plug is fitted so as to form a fuel passage in the inner cylinder. , a vaporized fuel injection pipe is attached to one end of the cylinder, and a fuel introduction pipe is attached to the other end of the cylinder, so that the heat receiving fins receive radiant heat from the combustion chamber of the combustor and transfer it to the inner cylinder. A state in which the heat radiation fins sufficiently receive and radiate heat to the fuel passage, in other words, heat reception and heat radiation are balanced, and liquid fuel, particularly liquid fuel that is difficult to vaporize, that is, low grade liquid fuel, is given sufficient heat of vaporization. Therefore, the liquid fuel is efficiently vaporized, the liquid fuel is vaporized rapidly and reliably, and the vaporized fuel is smoothly ejected from the ejection port. Therefore, the liquid fuel can be rapidly and reliably vaporized, and the vaporized fuel can be completely combusted, so that the vaporized fuel can be immediately combusted, and can be quickly used for heating, etc.

Furthermore, since the radiation fins formed on the inner circumferential surface of the inner cylinder extend in the longitudinal direction of the inner cylinder, the flow of fuel is not obstructed, and the vaporized fuel can be smoothly transferred to the vaporized fuel. It is ejected from the spout pipe. Furthermore, the structure is extremely simple, the liquid fuel vaporization device itself can be easily assembled and attached to the combustor, and maintenance etc. are easy. Regarding the fuel supply to the liquid fuel vaporizer, the system is configured to supply an optimum amount of liquid fuel to the liquid fuel vaporizer through the fuel introduction pipe in order to sequentially generate the amount of vaporized fuel necessary for combustion. In addition, since the liquid fuel is vaporized in the early stage of combustion, it can be controlled by controlling the supply amount of liquid fuel and the connection/disconnection of the heating plug, which is extremely desirable from the standpoint of safety, and has various effects. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a liquid fuel vaporization device according to the present invention, FIG. 2 is a sectional view taken along line nn in FIG. 4 is a plan view showing the heat receiving body of FIG. 3; FIG. 5 is a sectional view showing another example of the prior art vaporization device used in a combustor; and FIG. 6 are cross-sectional views showing yet another example of a prior art vaporizer used in a combustor. 1-------Liquid fuel vaporization device, 2-cylinder body, 3-inner cylinder, 4----radiating fins, 5-------heat receiving fins, 6-------vaporized fuel Spout pipe, 7---
Spout port, 8-fuel passage, 9-=-fuel introduction pipe, 10
-----Heating plug, 11-terminal, 14--fuel inlet, 15--spout part. Patent Applicant Isu Jidosha Co., Ltd. Agent Patent Attorney So Naka Onaka

Claims (5)

[Claims] (1) Press-fit an inner cylinder with heat-radiating fins on the inner circumference into a cylinder with heat-receiving fins on the outer circumference, insert a heating plug into the inner cylinder to form a fuel passage, and insert the heating plug into the inner cylinder to form a fuel passage. A liquid fuel vaporizing device characterized in that a vaporized fuel injection pipe is attached to one end of the cylindrical body, 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 the radiation fins formed on the inner peripheral surface of the inner cylinder extend in the longitudinal direction of the inner cylinder. (3) The liquid fuel vaporizer according to claim 1, wherein the inner cylinder is a metal sleeve. (4) The liquid fuel vaporization device according to claim 1, which is used by being placed in a combustion chamber of a combustor. (5) The liquid fuel vaporization device according to claim 4, wherein the heating plug functions as a vaporization glow plug in the combustor.