JP3035266B2 - Ignition device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device suitable for use in diesel engines and various combustors.

[0002]

2. Description of the Related Art It is well known that a glow plug as shown in FIG. 7 is used as an auxiliary device for starting a diesel engine.

The glow plug shown in FIG . 7 is a so-called sheathed type, and a heating element coil 4 is put in a heat-resistant steel (or ceramics) sheath 3 supported on a housing 1 via a sleeve 2 and is not shown. It is fixed by a filler. Then, a voltage from a power supply (battery) 7 is applied between the positive and negative electrodes 6a and 6b connected to the heating element coil 4 via the lead wires 5a and 5b, and the heating element coil 4 generates heat. A part of the heat-resistant steel sheath 3 glows red (see the glowing portion in the figure) and becomes a firing point.
In the drawing, reference numeral 8 denotes an insulator, and reference numeral 9 denotes a mounting screw portion.

[0004]

However, in the conventional glow plug, when a fuel such as light oil is mixed with a gas having a low oxygen concentration such as an exhaust gas of a diesel engine and the fuel is ignited, depending on flow conditions. However, there is a problem in that ignition may not be performed well, a high voltage is required for ignition, and power consumption increases.

Accordingly, an object of the present invention is to provide an ignition device capable of improving the ignitability of a glow plug to save power.

[0006]

In order to solve the above-mentioned problems, an ignition device according to the present invention provides a semicircle upstream of a gas flow with respect to a glow plug of a glow plug provided in a combustion chamber.
A tubular or wedge-shaped wake generator plate is provided , and at least a portion of the glow portion is placed so that the glow portion is located in the wake.
Located in the half cylinder or wedge of the wake generator
Characterized in that was.

Further, a plurality of holes through which a part of the gas passes are formed in the wake generating plate.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an ignition device according to the present invention will be described in detail using embodiments with reference to the drawings.

[First Embodiment] [Structure] FIG. 1 is a structural explanatory view of an ignition device showing a first embodiment of the present invention, FIG. 2 is a structural explanatory view of a wake generating plate, and FIG. It is a comparative explanatory drawing of a board presence / absence. In FIG. 1, the same members as those in FIG. 9 are denoted by the same reference numerals, and detailed description will be omitted.

As shown in FIG. 1, a semi-cylindrical wake generating plate 10 is attached to the glow plug housing 1 at a position upstream of the flow of fuel and gas with respect to the glow portion of the sheath 3. The wake of the wake generating plate 10 refers to Karman vortices alternately generated at the widthwise ends of the wake generating plate 10 due to the separation of the fuel and gas flows by the wake generating plate 10 (FIG. 1 (c)).

As shown in FIG. 2, the wake generating plate 10 is a simple semi-cylindrical plate (see FIG. 2A) having a plug mounting portion 10a at one end, and a gas except for the plug mounting portion 10a. Formed with a plurality of vertical slits 11 as holes through which a part of the plug mounting portion 10a passes (see FIG. 2B).
A plurality of horizontal slits 12 are formed as holes through which a part of the gas passes (see FIG. 3 (c)), and a small hole as a hole through which a part of the gas passes is removed except the plug mounting portion 10a. One in which a plurality of holes 13 are formed (see FIG. 4D) is appropriately selected.

[Operation / Effect] With this configuration, a voltage from a power source (battery not shown) is connected between the positive and negative electrodes 6a and 6b connected to the heating element coil 4 via the lead wires 5a and 5b. Is applied, the heating element coil 4
Generates heat, which causes a portion of the sheath 3 to glow red (see the glowing portion in the figure) to become an ignition point.

At this time, in the present embodiment, a wake (Kalman vortex) is generated by the wake generating plate 10, and the red hot portion is located in the wake, so that the fuel retention around the red hot portion is improved. The ignitability is improved. In other words, even a gas having a low oxygen concentration such as the exhaust gas of a diesel engine ignites.

As can be seen from the comparative illustration of the presence / absence of the wake generating plate in FIG . 6 , the case without the wake generating plate (see FIG. 6 (a))
Requires a load voltage of 19.5 V for stable ignition and stable combustion. However, when there is a wake generating plate (see FIG. 4B), a load voltage of 16.5 V is required. , Stable ignition and stable combustion are obtained, and unstable ignition and stable combustion are obtained at a load voltage of 14.7 V.

It is effective to provide the wake generating plate 10 with the vertical slits 11, the horizontal slits 12, the small holes 13 and the like so that the red fuel portion of the glow plug is appropriately sprayed with fuel.

[Second Embodiment] [Configuration] FIG. 3 is a structural explanatory view of an ignition device according to a second embodiment of the present invention, and FIG. 4 is a structural explanatory view of a wake generating plate.

This is the same as the wake generating plate 1 in the first embodiment.
This is an example in which 0 is formed in a wedge shape. According to this, the plug mounting portion 10a is formed by making a cut in one end of the wake generating plate 10. Others are the same as FIG. 1 and FIG.

[Operation / Effect] In this embodiment, the same operation / effect as in the first embodiment can be obtained.

[0019]

[0020]

[0021]

[ Third Embodiment] [Structure] FIG. 5 is a structural explanatory view of an ignition device according to a third embodiment of the present invention.

[0023] This (including the second embodiment) First Embodiment
Of the wake generation plate 10 is stopped from being attached to the glow plug itself, for example, to an exhaust purification device “diesel particulate filter (DPF) device” (also referred to as a black smoke removal device) that reduces exhaust particles of a diesel engine. This is an example of attaching to a combustor wall 15 such as a pre-combustor used. Others are the same as FIG. 1 and FIG. When the glow plug is attached to a pre-combustor or the like via a cooling jacket, the glow plug may be attached to the cooling jacket.

[Operation / Effect] In this embodiment, the same operation / effect as in the first embodiment can be obtained.

The present invention is not limited to the above embodiments,
It goes without saying that various changes such as changing the number of glow plugs are possible without departing from the gist of the present invention.

[0026]

According to the first aspect of the present invention, a semi-cylindrical or wedge-shaped wake generating plate is provided upstream of the gas flow with respect to the glow plug of the glow plug provided in the combustion chamber. At least of the glow portion so that the glow portion is located in the wake
A part is placed in the half cylinder or wedge of the wake generator plate.
Since, characterized in that by location, thereby improving the fuel retention is improved ignitability around red hot portion.

According to the second aspect of the present invention, a plurality of holes through which a part of the gas passes are formed in the wake generating plate. The ignitability is further improved.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of an ignition device showing a first embodiment of the present invention.

FIG. 2 is a structural explanatory view of a wake generating plate.

FIG. 3 is a structural explanatory view of an ignition device showing a second embodiment of the present invention.

FIG. 4 is a structural explanatory view of a wake generating plate.

FIG. 5 is a structural explanatory view of an ignition device according to a third embodiment of the present invention.

FIG. 6 is a comparative explanatory diagram of the presence / absence of a wake generating plate.

FIG. 7 is a structural explanatory view of a conventional glow plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Sleeve 3 Sheath 4 Heating element coil 5a, 5b Lead wire 6a, 6b Positive and negative electrodes 10 Wake generating plate 10a Plug mounting part 11 Vertical slit 12 Horizontal slit 13 Small hole 15 Combustor wall

Continued on the front page (72) Inventor Sadanori Toyama 3000 Tana, Sagamihara-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. (56) References JP-A 6-14756 (JP, U) JP-A 62-98968 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23Q 7/00-7 / 22 F02N 17/047 F02P 19/00

Claims (2)

(57) [Claims] 1. A half-cylindrical or wedge-shaped wake generating plate is disposed upstream of a gas flow with respect to a red-hot portion of a glow plug provided in a combustion chamber, and the red-hot portion is provided in a rear portion. At least a portion of the glowing portion so that it is located in the stream,
An ignition device characterized by being located in a cylinder or a wedge . 2. The ignition device according to claim 1, wherein a plurality of holes through which a part of the gas passes are formed in the wake generating plate.