JPS62665A - Fuel vaporizer for combustion device - Google Patents

Abstract

PURPOSE:To enable fuel to be completely vaporized by providing an external pipe supported to through a commutating wall plate defining a combustion chamber and a vaporizing chamber and having a jet opening to the vaporizing chamber and a heat receiving body projecting into the combustion chamber to utilize the fuel combustion heat of the combustion chamber after starting the running of the combustion device. CONSTITUTION:An external pipe 3c of a fuel vaporizer 3 having a jet 3a opening to a vaporizing chamber 2 is supported to extend through a commutating wall plate 6 defining said chamber 2 and a combustion chamber 7 and provided with a heat receiving body 31 on the end projecting into the combustion chamber 7. Thus, the fuel supplied from a fuel supply pipe 4 into an internal pipe 3b of said device 3 is heated by said body 31 of the external pipe 3c on the end projecting into the combustion chamber 7 to be completely vaporized and returned to the vaporizing chamber 2 through a gap 39 between the external and internal pipes and jetted from a jet 3a into the vaporizing chamber 2. Thus, after the running of the combustion device is started, fuel can be completely vaporized even if current is not supplied to a heating plug 5 like glow plug disposed in the internal pipe 3b of vaporizer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel vaporization device for a combustor used for promoting warm-up of a vehicle engine.

[Prior Art] The present applicant has already provided a combustor and a heat exchanger in the intake pipe of an engine in Japanese Patent Application No. 59-199362, etc., and mixed combustion gas from the combustor and intake air and sent the mixture to the engine. The company has filed an application for a warm-up device that does this. According to this warm-up device, the temperature of the intake air is increased, so that the warm-up operation can be shortened and the vehicle interior can be rapidly heated by the heat exchanger.

However, the fuel vaporization device in the combustor according to the above application cannot sufficiently utilize the heat of high-temperature combustion gas due to its structure, and some fuel may be ejected into the vaporization chamber without being vaporized, so this should be avoided. Therefore, the fuel is constantly heated and vaporized inside the fuel vaporization device using a heating plug. Constantly energizing the heating tap in this way consumes a lot of power, so
There is a risk that the normal on-board power supply battery will be exhausted.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a fuel vaporization device for a combustor that can completely vaporize the fuel by using the heat of fuel combustion in the combustion chamber after the combustor starts operating. There is a particular thing.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention includes a rectifying wall plate that is fitted and fixed inside the combustion boundary section to partition the combustion chamber and the vaporization chamber, and an outer tube that is supported through a wall plate and has a nozzle hole that opens into the vaporization chamber and a heat receiving body that projects into the combustion chamber; an inner tube that is inserted through the outer tube and connected to the fuel supply tube; and the inner tube. It is equipped with a heating plug located inside.

[Function] The outer pipe 3C of the fuel vaporizer 3 having the nozzle hole 3a opening into the vaporization chamber 2 is supported through the rectifying wall plate 6 that partitions the vaporization chamber 2 and the combustion chamber 7, and is projected into the combustion chamber 7. Since the heat receiving body 31 is provided at the end of the fuel supply pipe 4, the fuel vaporizer @
The fuel supplied to the inner tube 3C of No. 3 is completely vaporized by being heated by the heat receiving body 31 of the outer tube 3C at the end protruding into the combustion chamber 7, and then passes through the gap 39 between the outer tube 3C and the inner tube 3b. The gas then returns to the vaporization chamber 2 and is ejected into the vaporization chamber 2 from the nozzle hole 3a. Therefore, when the combustor starts operating (the fuel is green in the combustion chamber), the fuel is completely vaporized even if the heating plug 5, such as a glow plug, installed in the inner pipe 3b of the combustion vaporizer 3 is not energized. can do.

[Examples of the Invention] The present invention will be described based on Examples. As shown in FIG. 2, the combustor includes an outer cylinder 12 to which an intake pipe 34 is connected to a peripheral wall. The outer cylinder 12 has a peripheral wall reinforced by a reinforcing cylinder 14, and one end (left end) is closed by an end wall plate 13, while the other end is bent radially inward to form the fuel cylinder 1.
7. A combustion cylinder 17 made of, for example, ceramics is supported inside the outer cylinder 12. The left end of this combustion WJ 17 is closed by an end wall plate 11, while the right end is provided with an exhaust port 9.

Combustion with outer cylinder 12! An air chamber 21 communicating with the intake pipe 34 is formed between the 1117 and the combustion tube 1.
It communicates with the vaporization chamber 2 and the combustion chamber 7 through intake ports 15, 16 provided in the peripheral wall of the combustion chamber 7, respectively. A connecting ring 22 having an angular cross section is coupled to the end wall plate 11, and a flange 23 of a connecting tube 23 is fitted onto the connecting pipe 22 and the bent edge of the end wall plate 11.
a is connected to the end wall plate 13. Then, an adapter 37 for supporting the fuel vaporizer 3 and the ignition plug 40 is fitted and fixed into the opening of the end wall plate 13. This adapter 37 is provided with an opening extending toward the center of the combustion tube 17 for supporting the fuel vaporization device 3, and a screw hole 8a for supporting the ignition plug 40, preferably at an angle with respect to the central axis of the combustion tube 17.

A rectifying wall plate 6 made of a ceramic honeycomb structure is fitted and fixed in the middle part of the combustion tube 17, thereby controlling the vaporization v.
2 and a combustion chamber 7 are partitioned. The rectifying wall plate 6 is provided with a large number of elongated passages that communicate the vaporization chamber 2 and the combustion chamber 7, and the outer tube 3C of the cylindrical fuel vaporization device 3 is penetrated and supported approximately at the center of the rectifying wall plate 6. . For this reason, the outer pipe 3C of the fuel vaporizer 3 is supported through the wall of the adapter 37 via the heat insulating gasket 36, and the tip thereof passes through the hole in the end wall plate 11 and the hole 20 in the rectifying wall plate 6. and is projected into the combustion chamber 7.

As shown in FIG. 1, the fuel supply device 13 actually includes an outer tube 3C, an inner tube 3b, and a heating plug 5 such as a glow plug disposed in the inner tube 3b. The outer tube 3C is provided with a plurality of nozzle holes 3a that open into the vaporization chamber 2, and a heat receiving body 31 is formed in a large diameter closed end wall that projects into the combustion chamber 7. As shown in Fig. 3.4, the heat receiving body 31 has grooves 31a.
A large number of fins 31b are formed. The outer end of the inner tube 3b is threadedly supported on the outer end of the outer tube 3C via a heat insulating socket 35. The fuel supply pipe 4 is connected to the outer end of the inner pipe 3b, while the inner end extends close to the heat receiving body 31, and a gap 3 is formed between the inner pipe 3b and the outer pipe 3C.
9 (FIG. 1) is provided. The heating plug 5 is inserted into the screw hole 32 provided at the outer end of the inner tube 3b! ! The end portions are screwed together and supported, and this tip side heating portion is connected to the heat receiving body 3 with a gap between it and the inner tube 3b.
It is projected towards 1.

An ignition plug 40 made of a glow plug or the like that is screwed into a screw hole 8a of the adapter 37 is projected into the combustion chamber 7 through a hole 8b in the wall plate 11 and a hole 8C in the rectifying wall plate 6. The hole 20 of the rectifying wall plate 6 through which the large-diameter heat receiving body 31 is inserted and the outer tube 3
A vaporized fuel passage is formed between the outer tube 3C and the outer tube 3C so that a larger amount of vaporized fuel flows into the combustion chamber 7 than in other parts, and heating with an ignitability of 4o is directed toward this flow. part is protruded.

Next, the operation of the combustor according to the present invention will be explained. In FIG. 2, the intake air drawn into the air supply 21 from the intake pipe 34 is sucked into the vaporization chamber 2 through the intake port 15 of the combustion tube 17, and into the combustion chamber 7 through the intake port 16, and then from the exhaust port 9. It is sucked into the engine via a heat exchanger. Further, the fuel supplied from the fuel supply pipe 4 to the inner pipe 3b of the fuel vaporizer 3 is heated by the heating plug 5 (FIG. 1) and flows to the end of the outer pipe 3C, where the combustion gas in the combustion chamber 7 is heated. The heat receiving body 31 that touches
It is ejected to 2. The inner pipe 3b detours the fuel to the heat receiving body 31 of the high-temperature combustion chamber 7, and guides the fuel to the nozzle hole 3a of the outer pipe 3C.

The fuel vaporized in the vaporization chamber 2 is sucked into the combustion chamber 7 through the elongated passage of the rectifying wall plate 6, but especially when a large amount of vaporized fuel flows into the combustion chamber v7 along the outer pipe 3C at the hole 20, Since it comes into direct contact with the heat generating part of ignitability 40, the vaporized fuel is effectively heated, reaches the ignition temperature, and is ignited within a short time. In this case, the outer tube 3C of the fuel vaporizer 3 guides the flow of the vaporized fuel from the hole 20 to the fuel chamber 7, and since the outer tube 3C is heated by the heat receiving body 31, the temperature drop of the vaporized fuel is suppressed. to work.

Since the heat generating part of the ignitability 40 extends long along the outer pipe 3C of the fuel vaporizer 3, the time for the vaporized fuel to contact the ignitability 40 is long, and the temperature becomes high enough to ensure that the vaporized fuel is ignited. Ru. Thus, combustion of the vaporized fuel begins, mixes with excess air from the intake air 016, and burns completely.
It is sucked into the heat exchanger through the exhaust port 9.

The end of the outer tube 3C of the fuel vaporizer 3 has a large diameter and is provided with a large number of fins that protrude into the combustion chamber 7, so that when the fuel is ignited in the combustion chamber 7, the heating plug 5 is turned off. Even if the engine is stopped, vaporization of the fuel from the inner tube 3b is promoted. Rectifier wall plate 6
is heated by the flame in the combustion chamber 7, and the vaporization chamber 2 is heated by the radiant heat from the U-flow wall plate 6 and kept at a high temperature. However, the flame in the combustion chamber 7 does not blow out into the vaporization chamber 2.

As mentioned above, once the vaporized fuel sucked into the combustion chamber 7 via the rectifying wall plate 6 is ignited, the heat receiving body 31 is heated by the combustion heat of the combustion chamber 7, and the fuel flows from the inner tube 3b to the outer tube 3a. is heated by the heat receiving body 31 and completely vaporized, and is ejected from the injection hole 3a into the vaporization chamber 2. At the same time, the rectifying wall plate 6 is also heated by the flame of the combustion chamber 7, and the radiant heat from the rectifying wall plate 6 is Since the vaporization chamber 2 is kept at a high temperature,
Even if the power supply to the heating plug 5 and the igniter is stopped, the fuel injected from the nozzle hole 3a of the fuel vaporization device [3 into the vaporization chamber 2] is completely vaporized. be done.

[Effects of the Invention] As described above, the present invention is such that the end of the outer tube of the fuel vaporizer protrudes into the combustion chamber, and a heat receiving body that absorbs combustion heat is attached to this end. This heat receiving body heats and vaporizes the fuel flowing from the end of the inner tube to the outer tube of the fuel vaporizer, and after the combustor starts operating, the fuel is completely vaporized without energizing the heating plug. was achieved,
This helps in reducing power consumption and improves the vaporization efficiency of the fuel, which improves the ignitability of the fuel and provides a stable combustion state.

In particular, by arranging an inner pipe connected to the fuel supply pipe inside the outer pipe of the combustion vaporizer, the fuel flows from this inner pipe to the nozzle hole bypassing the heat receiving body at the end of the outer pipe. , effectively 110 of fuel is thermally vaporized.

In addition, even if fuel that is not completely vaporized is injected from the nozzle hole into the vaporization chamber at the start of operation, if the fuel ignites in the combustion chamber, the combustion heat immediately heats the fuel inside the fuel vaporization device via the heat receiver. As a result, complete vaporization of the fuel is promoted, stable combustion conditions are achieved in the combustor within a short period of time, and the time for energizing the fuel vaporization heating plug and ignitability is shortened. The durable life of the device is extended, power consumption is reduced, and power battery consumption is avoided.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a fuel vaporization device for a combustor according to the present invention, FIG. 2 is a side sectional view of a combustor equipped with the same fuel vaporization device, and FIG. 3 is a side sectional view of a heat receiving body of the fuel vaporization device. The front sectional view and FIG. 4 are the same plan views. 2: Vaporization v 3: Fuel vaporization device 3a: Nozzle hole 3b: Inner tube 3C: Outer tube 5: Heating plug 6: Rectifying wall plate 7: Combustion chamber 17: Combustion Wi 31: Heat receiving body 31b: Fin 3
9: Gap 40: Spark hydrant patent applicant Toshio Sanmizu, agent of Isui Jidosha Co., Ltd., patent attorney Figure 2

Claims (2)

[Claims] (1) A rectifying wall plate that is fitted and fixed inside the combustion tube to partition the combustion chamber and the vaporization chamber, a nozzle hole that is supported through the rectification wall plate and opens into the vaporization chamber, and that projects into the combustion chamber. A combustor fuel comprising: an outer tube having a heat receiving body; an inner tube inserted into the outer tube and connected to a fuel supply tube; and a heating plug disposed inside the inner tube. vaporizer. (2) The fuel vaporization device for a combustor according to claim (1), wherein the outer tube is made of ceramics, and the heat receiving body is provided with fins.