JPH0457866B2 - - Google Patents

Description

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

[Prior Art] The present applicant has already installed a combustor and a heat exchanger in the intake pipe of an engine in Japanese Patent Application No. 59-199362, etc.
We are proposing a warm-up device that mixes combustion gas from the combustor and intake air and supplies it to the engine. Since the above-mentioned warm-up device increases the intake air temperature, it becomes possible to shorten the warm-up operation and speed up the heating of the vehicle interior by the heat exchanger.

However, in the combustor used in the above-mentioned warm-up device, the power consumption of electric heating plugs such as glow plugs used to vaporize fuel is extremely large, and in order to continue using them during warm-up operation, it is necessary to A large-capacity generator is required, and there is a risk that the power battery will be exhausted.

[Problems to be Solved by the Invention] Therefore, the purpose of the present invention is to shorten the operating time of electric heating taps and reduce the consumption of power batteries by promoting the vaporization of fuel using the combustion heat of the combustor. The objective is to provide a combustor structure that avoids this.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention is to arrange a combustion cylinder concentrically inside an outer cylinder that communicates with an intake pipe, and to partition an air chamber between the two. A porous wall plate made of ceramic is fitted inside the combustion tube to partition the combustion chamber and the vaporization chamber, and a plurality of air supply holes are provided in the peripheral wall of the combustion tube to communicate the air chamber with the vaporization chamber and the combustion chamber, respectively. A fuel nozzle is formed integrally with the porous wall plate to protrude to the outside through the vaporization chamber, a fuel supply pipe is connected to the fuel nozzle, and an exhaust pipe is connected to the end wall of the combustion chamber. It has a nozzle that communicates with the vaporizing chamber and an electric heating plug inside the fuel nozzle.

[Function] Once the vaporized fuel drawn into the combustion chamber from the vaporization chamber via the porous wall plate is ignited, the porous wall plate and the fuel nozzle are heated by the combustion heat in the combustion chamber, and the gas from the porous wall plate is heated. Since the vaporizing chamber is kept at a high temperature by radiant heat, even if the electric heating tap is turned off, the fuel jetted from the fuel nozzle into the vaporizing chamber can be vaporized, and the power consumption of the electric heating tap can be significantly reduced. .

[Embodiment of the Invention] FIG. 2 is a schematic diagram of an intake system of an engine 35 equipped with a combustor 36 for rapidly heating the passenger compartment and shortening the warm-up period. Intake air sucked from the air purifier 31 is supplied to the combustor 36 via the bypass intake pipe 34 at the switching valve 32 of the intake pipe 33, and is then supplied to the combustor 36 via the conduit 30 from the fuel pump 29 attached to the engine 35. The combustion gas and excess intake air are used for combustion of the fuel supplied to the heat exchanger 3.
7 and is supplied to the engine 35. At the same time, the heating air sent from the intake duct 38 to the heat exchanger 37 passes through the blow-off duct 39 and is sent to the blow-off port 41 of the vehicle interior by the blower 40.

As shown in FIG. 1, the combustor 36 includes an outer cylinder 12 having a bypass intake pipe 34 connected to a peripheral wall thereof. One end (left end) of the outer cylinder 12 is an end wall plate 12a.
The other end is connected to the heat exchanger 3 via an exhaust pipe 34a that constitutes a part of the bypass intake pipe 34.
Connected to 7. A combustion cylinder 17 made of ceramics, for example, is supported inside the outer cylinder 12. The left end of the combustion tube 17 is closed by the cover plate 14, the right end is fitted and supported by the enlarged diameter portion of the exhaust pipe 34a, and the exhaust port 9 is communicated with the exhaust pipe 34a.

According to the present invention, the porous wall plate 6 made of a ceramic honeycomb structure or the like is fitted and fixed in the middle part of the combustion tube 17, and the vaporization chamber 2 and the combustion chamber 7 are connected to each other by the porous wall plate 6. It is divided into 17 areas. The porous wall plate 6 is provided with a large number of passages communicating the vaporization chamber 2 and the combustion chamber 7, and has a cylindrical fuel nozzle 3.
is integrally formed approximately at the center of the porous wall plate 6. The wall portion 6a of the porous wall plate 6 to which the fuel nozzle 3 is connected has its holes closed so as not to communicate with the combustion chamber 7. The fuel nozzle 3 passes through the vaporization chamber 2 and the lid plate 14 and projects into a cylindrical portion 13 provided on the end wall plate 12a. The fuel nozzle 3 is provided with a nozzle hole 3a opening into the vaporization chamber 2 on its peripheral wall. Cylindrical part 13
The end walls support the inner cylinder 4 and the base end portions of the electric heating plug 5, respectively. The tip of the electric heating plug 5 projects into the interior of the fuel nozzle 3 to constitute a fuel vaporization device. The inner cylinder 4 has a fuel supply pipe 4a connected to its peripheral wall,
The fuel supply pipe 4a is connected to a conduit 30 shown in FIG.

An air chamber 21 that communicates with the bypass intake pipe 34 is formed between the outer cylinder 12, the peripheral wall of the combustion cylinder 17, and the cover plate 14. The air chamber 21 is connected to the vaporization chamber 2 through air supply holes 15 and 16 provided in the peripheral wall of the combustion tube 17, respectively.
and is communicated to the combustion chamber 7. The ignition plug 8 is an end wall plate 12
a and the cover plate 14, the tip of the ignition plug 8 penetrates the porous wall plate 6 and projects into the combustion chamber 7.

Next, the operation of the combustor according to the present invention will be explained. The intake air sucked into the air chamber 21 from the bypass intake pipe 34 at the same time as the engine starts is transferred to the combustion tube 17.
through the air supply hole 15 to the vaporization chamber 2, and the air supply hole 16
The air is sucked into the combustion chamber 7 through the exhaust port 9 and into the heat exchanger 37 through the exhaust pipe 34a. The fuel supplied from the fuel supply pipe 4a to the inner cylinder 4 is heated and vaporized by the electric heating plug 5, and then flows from the open end of the inner cylinder 4 facing the wall 6a to the fuel nozzle 3.
and is ejected from the nozzle hole 3a into the vaporization chamber 2. The inner cylinder 4 detours the fuel to the high-temperature porous wall plate 6 and guides it to the nozzle hole 3a. The fuel is vaporized in the vaporization chamber 2, mixed with air, and sucked from the vaporization chamber 2 into the combustion chamber 7 through a narrow passage in the porous wall plate 6. The mixed gas of fuel and air is heated and ignited by the ignition plug 8 and combusted, and flows out to the heat exchanger 37 through the exhaust port 9 while being mixed with excess air from the air supply hole 16 .

When the vaporized fuel is ignited in the combustion chamber 7, the ignition plug 8
Then, the supply of electricity to the electric heating plug 5 constituting the fuel vaporization device is stopped. Since the porous wall plate 6 is heated by the heat of the combustion chamber 7, the fuel injected into the vaporization chamber 2 is accelerated to vaporize by the radiant heat from the porous wall plate 6, and the heating of the fuel by the electric heating plug 5 is accelerated. Not needed.

The porous wall plate 6 and the fuel nozzle 3 are integrally molded from ceramics, and the heat in the combustion chamber 7 is transmitted to the vaporization chamber 2 and the fuel nozzle 3 via the porous wall plate 6, but the flame in the combustion chamber 7 It does not blow out into the vaporization chamber 2. The porous wall plate 6 withstands the high temperatures of the combustion chamber 7 and promotes complete vaporization of the fuel from the vaporization chamber 2. In this way, once the vaporized fuel sucked into the combustion chamber 7 via the porous wall plate 6 is ignited, the porous wall plate 6 and the fuel nozzle 3 are heated by the combustion heat of the combustion chamber 7, and the vaporization chamber 2 is Since the high temperature is maintained by the radiant heat from the solid wall plate 6, even if the electricity supply to the electric heating plug 5 is reduced or stopped, the fuel is vaporized inside the fuel nozzle 3 and flows from the nozzle hole 3a of the fuel nozzle 3 into the vaporization chamber. 2 and is vaporized in the vaporization chamber 2, and further heated and vaporized through the holes in the porous wall plate 6. Therefore, the power consumption of the electric heating plug 5 is significantly reduced, and consumption of the power battery can be prevented.

[Effects of the Invention] As described above, the present invention provides a combustion tube that is concentrically disposed inside an outer tube communicating with an intake pipe, an air chamber is defined between the two, and a ceramic tube made of ceramic inside the combustion tube. A porous wall plate is fitted to partition the combustion chamber and the vaporization chamber, a plurality of air supply holes are provided in the peripheral wall of the combustion tube to communicate the air chamber with the vaporization chamber and the combustion chamber, and exhaust air is provided in the end wall of the combustion chamber. A fuel nozzle is formed integrally with the porous wall plate and protrudes to the outside through the vaporization chamber, a fuel supply pipe is connected to the fuel nozzle, and a nozzle hole communicating with the vaporization chamber is provided on the peripheral wall of the fuel nozzle. , an electric heating plug is arranged inside the fuel nozzle, and in particular, a nozzle opening into the vaporization chamber is integrated with a porous wall plate that partitions the combustion chamber and the vaporization chamber inside the combustion tube. Once the vaporized fuel is ignited, the porous wall plate and the fuel nozzle are heated.
The fuel undergoes three stages: primary vaporization by heating in the fuel nozzle, secondary vaporization in the vaporization chamber by radiant heat from the porous wall plate and fuel nozzle, and tertiary vaporization in the holes in the porous wall plate. It is vaporized and a stable combustion state is quickly achieved, and the power consumption of the electric heating valve is reduced, so the combustor can be operated using a power battery and generator of conventional capacity.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the structure of a combustor according to the present invention, and FIG. 2 is a schematic configuration diagram of a warm-up device for an engine equipped with the combustor. 2: Vaporization chamber, 3: Fuel nozzle, 3a: Nozzle hole, 4
a: fuel supply pipe, 5: electric heating plug, 6: porous wall plate, 7: combustion chamber, 8: ignition plug, 12: outer cylinder, 1
5, 16: air supply hole, 17: combustion tube, 21: air chamber, 34: intake pipe, 34a: exhaust pipe.

Claims (1)

[Claims] 1 A combustion tube is arranged concentrically inside an outer tube that communicates with the intake pipe, an air chamber is defined between the two, and a ceramic porous wall plate is fitted inside the combustion tube to form a combustion chamber. The vaporization chamber is divided, a plurality of air supply holes are provided in the peripheral wall of the combustion cylinder to communicate the air chamber, the vaporization chamber, and the combustion chamber, respectively, and an exhaust pipe is connected to the end wall of the combustion chamber.
A fuel nozzle that protrudes to the outside through the vaporization chamber is formed integrally with the porous wall plate, a fuel supply pipe is connected to the fuel nozzle, a nozzle hole communicating with the vaporization chamber is provided on the peripheral wall of the fuel nozzle, and the inside of the fuel nozzle is A combustor structure characterized by an electric heating plug installed in the combustor.