JPH0514162B2 - - 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 heating combustor and a heat exchanger in the intake pipe of an engine in Japanese Patent Application No. 59-213156, etc., and mixed combustion gas from the combustor with intake air to generate engine power. The company is applying for a warm-up device that sends air to 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 heating heat exchanger.

As shown in FIG. 3, in the combustor according to the above application, a fuel nozzle 3 consisting of an inner tube 3b and an outer tube 3c is supported through a rectifying wall plate 6, and fuel is supplied from a fuel supply tube 4a to an inner tube 3b. The fuel is heated by a vaporizing heating plug 5 made of a glow plug, flows into the outer tube 3c, and is ejected from the injection port 3a into the vaporizing chamber 2. The fuel vaporized in the vaporization chamber 2 is sent to the combustion chamber 7 through a large number of narrow passages in the rectifying wall plate 6, and is heated and ignited by an ignition glow plug 8. However, the flow of vaporized or atomized fuel, the flow of combustion air, the pressure inside the combustion tube 17, etc. change in response to engine cranking and engine speed immediately after startup, so they are not suitable for ignition. If the conditions are difficult to obtain, fuel may be drawn into the engine without being heated and ignited.

[Problems to be Solved by the Invention] In view of the above-mentioned problems, an object of the present invention is to improve the ignitability of fuel by increasing the heat transfer efficiency between the ignition glow plug and the vaporized fuel.
The purpose is to provide the structure of the combustor.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention is such that a rectifying wall plate having a large number of narrow passages is fitted and fixed inside a combustion tube to partition a combustion chamber and a vaporization chamber. A fuel nozzle containing a heating plug for fuel vaporization and equipped with a nozzle opening to the vaporization chamber is supported through the rectifying wall plate, and a vaporized fuel passage is provided in the rectifying wall plate close to the fuel nozzle, and a fuel nozzle is provided for ignition. A glow plug protrudes from the vaporization chamber into the combustion chamber through the vaporized fuel passage.

[Function] Since the rectifying wall plate is provided with a vaporized fuel passage close to the fuel nozzle penetrating and supported almost at the center of the rectifying wall plate, and the ignition glow plug is protruded into the vaporized fuel passage of the rectifying wall plate, When the vaporized fuel in the vaporization chamber flows through the vaporized fuel passage along the fuel nozzle to the combustion chamber 7, it is heated by the ignition glow plug and is reliably ignited.

[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. Air sucked in from the air cleaner 31 is supplied to the combustor 36 via the intake bypass pipe 34 at the switching valve 32 of the intake pipe 33, where the fuel pump 29 attached to the engine 35
The combustion gas and excess air are supplied to the engine 35 from the connecting pipe 34a, which is part of the intake bypass pipe, through the heating heat exchanger 37. .

At the same time, from the air intake duct 38 to the heating heat exchanger 3
The heating air sent to 7 passes through a blow-off duct 39 and is sent to a blow-off port 41 in the vehicle interior by a blower 40.

As shown in FIG. 1, the combustor 36 includes an outer cylinder 12 to which an intake bypass pipe 34 is connected to a peripheral wall. One end (left end) of the outer cylinder 12 is an end wall plate 12a.
while the other end is bent radially inward and connected to the end of the combustion tube 17. Outer cylinder 12
A combustion tube 17 made of, for example, ceramics is supported inside. The left end of the combustion tube 17 is closed by the end wall plate 12a, while the right end is closed by the exhaust port 9.
can be established.

According to the present invention, the rectifying wall plate 6 made of a ceramic honeycomb structure is fitted and fixed in the middle portion of the combustion tube 17, and the vaporizing chamber 2 and the combustion chamber 7 are partitioned by the rectifying wall plate 6. The rectifying wall plate 6 is provided with a large number of narrow passages communicating the vaporization chamber 2 and the combustion chamber 7, and a cylindrical fuel nozzle 3 is passed through and supported approximately at the center of the rectifying wall plate 6. The fuel nozzle 3 is attached to the end wall plate 1
2a and protrudes to the outside. fuel nozzle 3
consists of an inner tube 3b and an outer tube 3c, and a heating plug 5 is supported on the inner tube 3b. Inner pipe 3b is fuel supply pipe 4a
The fuel supply pipe 4a is connected to a conduit 30 shown in FIG. The outer tube 3c is provided with a nozzle hole 3a opening into the vaporization chamber 2 on its peripheral wall.

An air chamber 21 communicating with the intake bypass pipe 34 is formed between the outer cylinder 12 and the combustion cylinder 17.
1 are intake ports 15 and 16 provided on the peripheral wall of the combustion tube 17
are communicated with the vaporization chamber 2 and the combustion chamber 7, respectively. An ignition glow plug 8 is supported by the end wall plate 12 a and the rectifying wall plate 6 , and the tip of the ignition glow plug 8 penetrates the rectifying wall plate 6 and projects into the combustion chamber 7 .

According to the present invention, the fuel nozzle 3 is supported penetrating approximately the center of the rectifying wall plate 6, the vaporized fuel passage 19 is provided in the rectifying wall plate 6 close to the fuel nozzle 3, and the ignition glow plug 8 is inserted into the vaporizing chamber 2. It projects into the combustion chamber 7 through the vaporized fuel passage 19 .

Preferably, the ignition glow plug 8 is inclined towards the fuel nozzle 3. The vaporized fuel passage 19 has a sufficiently wider passage area than the many narrow passages provided in the rectifying wall plate 6, and is connected from the vaporization chamber 2 to the combustion chamber 7 along the fuel nozzle 3 via the vaporized fuel passage 19. The structure is such that a larger amount of vaporized fuel flows than the other parts.

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 intake bypass pipe 34 at the same time as the engine starts is transferred to the combustion tube 17.
to the vaporization chamber 2 through the intake port 15, and the intake port 16.
The air is sucked into the combustion chamber 7 through the exhaust port 9 and into the heating heat exchanger 37 through the connecting pipe 34a (FIG. 2). In addition, the fuel supply pipe 4a
The fuel supplied to the inner pipe 3b of the fuel nozzle 3 is heated by the heating plug 5, enters the outer pipe 3c, and is ejected from the nozzle hole 3a into the vaporization chamber 2. The inner pipe 3b detours the fuel to the high-temperature combustion chamber 7 and directs the fuel to the nozzle hole 3 of the outer pipe 3c.
lead to a.

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 a large amount of vaporized fuel flows along the fuel nozzle 3 into the combustion chamber 7, especially in the vaporized fuel passage 19. When flowing, the vaporized fuel comes into direct contact with the heat generating part of the ignition glow plug 8, so that the vaporized fuel is effectively heated, reaches the ignition temperature, and is ignited within a short time. In this case, the outer pipe 3 of the fuel nozzle 3
C guides the flow of vaporized fuel from the vaporized fuel passage 19 toward the combustion chamber 7, and since the outer tube 3c is heated by the heating plug 5, it functions to suppress a drop in temperature of the vaporized fuel.

The heating part of the ignition glow plug 8 is the fuel nozzle 3
Since it extends long along the outer tube 3c, the vaporized fuel contacts the ignition glow plug 8 for a long time, the temperature becomes sufficiently high, and the vaporized fuel is reliably ignited.

In this way, it is heated and ignited by the heat generating portion of the ignition glow plug 8 to start combustion, and is sucked into the heating heat exchanger 37 from the exhaust port 9 while being mixed with excess air from the intake port 16 . After ignition, the fuel in the fuel nozzle 3 is heated at the protrusion into the combustion chamber 7, and the fuel in the vaporization chamber 2 is accelerated to vaporize by radiant heat from the rectifying wall plate 6 heated on the combustion chamber side. The heat in the combustion chamber 7 is transferred to the vaporization chamber 2 via the rectifying wall plate 6, but the flame in the combustion chamber 7 is sucked into the engine 35.
It does not blow out into the vaporization chamber 2. The rectifying wall plate 6 withstands the high temperature of the combustion chamber 7 and keeps the vaporization chamber 2 at a high temperature.

As mentioned above, once the vaporized fuel sucked into the combustion chamber 7 through the rectifying wall plate 6 is ignited, the combustion chamber 7
The rectifying wall plate 6 is heated by the combustion heat of the rectifying wall plate 6, and the vaporization chamber 2 is kept at a high temperature by the radiant heat from the rectifying wall plate 6. Therefore, even if the electricity to the heating plug 5 and the ignition glow plug 8 is stopped, the fuel The fuel injected from the injection hole 3a of the nozzle 3 into the vaporization chamber 2 is vaporized.

[Effects of the Invention] As described above, the present invention has a rectifying wall plate having a large number of narrow passages that is fitted and fixed inside a combustion tube to partition a combustion chamber and a vaporization chamber, and accommodate a heating plug for fuel vaporization. In addition, a fuel nozzle with a nozzle hole opening into the vaporization chamber is supported through the rectification wall plate, a vaporized fuel passage is provided in the rectification wall plate close to the fuel nozzle, and an ignition glow plug is connected from the vaporization chamber to the vaporized fuel passage. The vaporized fuel that protrudes into the combustion chamber through the vaporization chamber, passes through the vaporized fuel passage, and then goes to the combustion chamber.The vaporized fuel is effectively heated by the ignition glow plug, and an extremely advanced ignition glow plug temperature control device and combustion air control system are used. Even without a device, the ignition can be reliably ignited within a short time. Therefore, the time for energizing the fuel vaporization heating plug and ignition glow plug is shortened, resulting in reduced power consumption, avoidance of power battery consumption, and longer service life of the fuel vaporization heating plug and ignition glow plug. will be extended.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the structure of a combustor according to the present invention, Fig. 2 is a schematic configuration diagram of a warm-up device for an engine equipped with the combustor, and Fig. 3 shows the structure of a conventional combustor. FIG. 2: vaporization chamber, 3: fuel nozzle, 3a: nozzle hole,
5: heating plug, 6: rectifying wall plate, 7: combustion chamber, 8: ignition glow plug, 17: combustion tube, 31: air cleaner, 33: intake pipe, 34: intake bypass pipe,
36: Combustor.

Claims (1)

[Claims] 1. A rectifying wall plate having a large number of narrow passages is fitted and fixed inside a combustion cylinder to partition a combustion chamber and a vaporization chamber,
A fuel nozzle having a heating plug for fuel vaporization housed therein and having a nozzle hole opening into a vaporization chamber in a peripheral wall is supported through a rectifying wall plate, and a vaporized fuel passage is provided in the rectifying wall plate close to the fuel nozzle, A combustor structure characterized by an ignition glow plug protruding from the vaporization chamber through the vaporized fuel passage into the combustion chamber. 2. The combustor structure according to claim 1, wherein the rectifying wall plate is made of honeycomb-structured ceramics. 3. The combustor structure according to claim 1, wherein an intake port is provided on a peripheral wall of the combustion tube, and an exhaust port is provided on an end wall of the combustion tube on the combustion chamber side.