JPH059487Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] 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. 59-213156, etc.
The company has filed an application for a warm-up device that mixes combustion gas from a combustor and intake air and sends the mixture to the engine. According to this warm-up device, it is possible to shorten the warm-up operation by heating the intake air and to rapidly heat the passenger compartment by the heat exchanger.

In the combustor used in the above-mentioned warm-up device, vaporized or atomized fuel is heated and ignited in the heat generating portion of the ignition glow plug. However, if the ignition glow plug is cooled by the combustion air and cannot heat the fuel to the ignition temperature, the fuel may be drawn into the engine without being ignited. In order to improve this kind of ignition failure, it is possible to increase the power supplied to the ignition glow plug and increase the amount of heat generated by the ignition glow plug, but this will reduce the durability of the ignition glow plug. Not only will this cause damage, but there is a risk that the on-vehicle power supply battery will be exhausted.

[Problems to be solved by the invention] Therefore, in view of the above-mentioned problems, the purpose of the invention is to develop a combustor structure that can increase fuel heating efficiency and improve ignitability even with a small-capacity ignition glow plug. It is about providing.

[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention includes a plurality of intake ports in the peripheral wall inside an outer cylinder closed at one end and closed at the other end. A combustion tube with a combustion gas outlet is arranged coaxially, and an annular air chamber having an air inlet is defined between the outer tube and the combustion tube,
A rectifying wall plate having a large number of thin holes is fitted and fixed inside the combustion tube to partition the vaporization chamber and the combustion chamber, and the end wall of the outer tube projects through the vaporization chamber into the combustion chamber and opens into the vaporization chamber. A fuel nozzle consisting of an inner and outer double pipe with nozzle holes is provided, and an ignition glow plug is provided that penetrates the outer cylinder and combustion cylinder and protrudes into the combustion chamber along the rectifying wall plate. A windbreak plate with a semicircular arc cross section is installed on the opposite side of the plug from the rectifying wall plate.

[Function] By arranging a windbreak plate on one side of the ignition glow plug to block the flow of air drawn into the combustion chamber, a stagnation of vaporized fuel is formed and efficiently spread around the ignition glow plug. Since the air is heated and heat dissipation is suppressed, the vaporized fuel quickly reaches the ignition temperature and is ignited.

[Embodiment of the invention] FIG. 3 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 a bypass pipe 34 selected by the switching valve 32 of the intake pipe 33, and in the combustor 36, it is supplied to the combustor 36 from a fuel pump 29 attached to the engine 35 via a conduit 30. The supplied fuel is combusted, and the combustion gas and excess air are passed through the connecting pipe 34a, which is a part of the bypass pipe, and the heat exchanger 37.
It is supplied to the engine 35 through the. 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 in the passenger compartment by the blower 40.

As shown in FIG. 1, the combustor 36 includes an outer cylinder 12 to which a bypass pipe 34 is coupled to a peripheral wall.
One end (left end) of the outer cylinder 12 is closed by an end wall plate 12a, while the other end is bent radially inward and connected to the end wall of the combustion cylinder 17. A combustion cylinder 1 made of, for example, ceramics is disposed inside the outer cylinder 12.
7 is supported. The left end of the combustion tube 17 is the lid plate 14
On the other hand, the right end of the combustion tube 17 is provided with an exhaust port 9.

A rectifying wall plate 6 is fitted and fixed to an intermediate 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 made of, for example, porous ceramics, and is provided with a large number of holes that communicate the vaporization chamber 2 and the combustion chamber 7. Preferably,
A cylindrical fuel nozzle 3 is supported through the rectifying wall plate 6 substantially at its center. The fuel nozzle 3 consists of an inner tube 3b and an outer tube 3c. Fuel is supplied from the fuel supply tube 4a to the outer end of the inner tube 3b, is turned back from the inner end of the fuel nozzle 3, and is injected into the outer tube 3c. It is ejected from the hole 3a into the vaporization chamber 2.

A bypass pipe 3 is provided between the outer cylinder 12 and the combustion cylinder 17.
An air chamber 21 is formed which communicates with the air chamber 21.
are communicated with the vaporization chamber 2 and the combustion chamber 7 through intake ports 15 and 16 provided in the peripheral wall of the combustion tube 17, respectively.
An ignition glow plug 8 is supported through the peripheral wall of the outer cylinder 12 and the combustion cylinder 17, and the heat generating part of the ignition glow plug 8 is connected to the fuel nozzle 3 along the rectifying wall plate 6.
It is projected towards.

According to the present invention, in order to prevent the air flowing from the intake port 16 of the combustion tube 17 toward the center of the combustion tube 17 from hitting the heat generating part of the ignition glow plug 8,
A windbreak plate 20 is provided. Specifically, windbreak plate 2
0 is curved to have a semicircular arc in cross section, and is supported by the combustion tube 17 so as to cover the part of the heat generating part of the ignition glow plug 8 on the side opposite to the rectifier plate 6.

Next, the operation of the combustor according to the present invention will be explained. Simultaneously with the start of the engine, air is sucked into the air chamber 21 from the bypass pipe 34, through the intake port 15 of the combustion tube 17, into the vaporization chamber 2, and through the intake port 16 into the combustion chamber 7, respectively. Fuel supply pipe 4
The fuel supplied from a to the inner tube 3b of the fuel nozzle 3 enters the outer tube 3c from the inner end of the inner tube 3b, and enters the nozzle hole 3.
It is ejected from a to the vaporization chamber 2. The inner tube 3b detours the fuel to the end of the outer tube 3c, which receives the heat of the combustion chamber 7, and guides it to the nozzle hole 3a. The nozzle hole 3a has a minute hole diameter,
The fuel expands through vaporization and is atomized and dispersed from the nozzle hole 3a into the vaporization chamber 2. The fuel is vaporized or atomized in the vaporization chamber 2 and mixed with air, and is drawn from the vaporization chamber 2 into the combustion chamber 7 through narrow holes in the rectifying wall plate 6. The mixture of fuel and air is heated and ignited by the ignition glow plug 8, and is drawn into the heat exchanger 37 (see FIG. 3) from the exhaust port 9 while being mixed with excess air from the intake port 16.

When the vaporized fuel is ignited in the combustion chamber 7, the energization to the ignition glow plug 8 is stopped. Rectifier wall plate 6
is heated by the heat of the combustion chamber 7, and the radiant heat from the rectifying wall plate 6 promotes vaporization of the fuel injected into the vaporization chamber 2.

It is preferable that the rectifying wall plate 6 and the fuel nozzle 3 are integrally molded from ceramics or the like, and heat from the combustion chamber 7 is transmitted to the vaporization chamber 2 via the rectifying wall plate 6, but a pressure difference occurs due to the air flow. However, since the air in the vaporization chamber 2 is sucked, the flame in the combustion chamber 7 does not blow out into the vaporization chamber 2. The rectifying wall plate 6 withstands the high temperature of the combustion chamber 7 and maintains the temperature of the vaporization chamber 2 at a high temperature.

[Effects of the invention] As described above, the present invention includes a combustion cylinder which has a large number of intake ports on the peripheral wall, has one end closed, and has a combustion gas outlet at the other end, inside the outer cylinder which is closed at one end. Arranged coaxially, an annular air chamber with an air inlet is defined between the outer cylinder and the combustion cylinder, and a rectifying wall plate with many thin holes is fitted and fixed inside the combustion cylinder to form a vaporization chamber. A fuel nozzle consisting of an inner and outer double pipe is provided, which separates the fuel from the combustion chamber, projects from the end wall of the outer cylinder through the vaporization chamber into the combustion chamber, and is equipped with a nozzle hole that opens into the vaporization chamber.
An ignition glow plug is installed that penetrates the outer cylinder and combustion cylinder and protrudes into the combustion chamber along a rectifying wall plate, and a windbreak plate with a semicircular arc cross section is placed on the opposite side of the ignition glow plug from the rectifying wall plate. By setting it up, the following effects can be obtained.

By arranging the windbreak plate to block the flow of air from the intake port toward the ignition glow plug in the combustion chamber, a mixture of vaporized or atomized fuel and air flows from the rectifier wall plate toward the combustion chamber. In the flow of fuel, stagnation occurs at the windbreak plate, and the fuel is efficiently heated by the ignition glow plug, and the stagnation prevents heat dissipation, so the fuel reaches the ignition temperature and ignites within a short time.

Therefore, the air-fuel mixture is reliably ignited within a short period of time without the need for a particularly large-capacity ignition glow plug, improving the durability of the ignition glow plug and reducing consumption of the ignition glow plug. Power consumption is significantly reduced and power battery consumption is reduced.

Ignition can be easily achieved even without particularly sophisticated control (for example, adjusting the opening degree of the switching valve 32 in FIG. 3) regarding the flow rate of air flowing from the air chamber into the combustion chamber through the intake port of the combustion tube. It will be done.

Once the fuel is ignited, the fuel receives heat from the combustion chamber at the end of the fuel nozzle and is vaporized and ejected into the vaporization chamber, where it mixes with air and passes through the holes in the rectifying wall plate to the fuel chamber. Since the fuel is ready for combustion by the time it is ejected, the combustion state continues stably.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the structure of the combustor according to the present invention, Fig. 2 is a plan sectional view showing the main parts enlarged, and Fig. 3 is a warm-up system for an engine equipped with the combustor. It is a schematic block diagram. 2... Vaporization chamber, 3... Fuel nozzle, 3a... Nozzle hole, 4a... Fuel supply pipe, 6... Rectifying wall plate, 7...
...Combustion chamber, 8...Ignition glow plug, 17...
Combustion tube, 31...Air cleaner, 33...Intake pipe, 34...Bypass pipe, 36...Combustor.

Claims (1)

[Scope of utility model registration request] Inside the outer cylinder, which is closed at one end, a combustion cylinder, which has a large number of intake ports on the peripheral wall, is closed at one end, and has a combustion gas outlet at the other end, is arranged coaxially, and between the outer cylinder and the combustion cylinder. An annular air chamber having an air inlet is defined in the combustion chamber, and a rectifying wall plate having a large number of thin through holes is fitted and fixed inside the combustion cylinder to partition the vaporization chamber and the combustion chamber,
A fuel nozzle consisting of an inner and outer double pipe with a nozzle hole that protrudes from the end wall of the outer cylinder through the vaporization chamber into the combustion chamber and opens into the vaporization chamber is provided, and the fuel nozzle passes through the outer cylinder and the combustion cylinder and connects to the rectifying wall plate. A combustion chamber structure characterized in that an ignition glow plug is disposed along the ignition glow plug to protrude into the combustion chamber, and a windbreak plate having a semicircular arc cross section is disposed on the opposite side of the rectifying wall plate of the ignition glow plug.