JPH0633754B2 - Engine warm-up device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine warming device, and more particularly, to a combustor installed in an intake passage of an engine, regardless of the operating condition (rotational fluctuation) of the engine. The present invention relates to a warming device for an engine that can be stably burned.

[Conventional technology]

In recent years, a combustor such as a burner is installed in the intake passage of the engine to raise the intake temperature at the time of starting the engine, improve the engine startability and warm-up performance, and install a heat exchanger downstream of the combustor. There is an attempt to improve the capacity of the heating device provided immediately after the engine is started by connecting this heat exchanger to the heating device of the vehicle (Japanese Patent Application No. 58-165310).

However, in such a conventional combustor in which a burner is directly installed in the intake pipe of an engine, it is difficult to introduce air into the combustor, and if proper air is not introduced, the burner will blow out and soot will be generated. In addition, since the vaporization time of the supplied fuel is long, liquid combustion of the fuel occurs and unstable gas is often generated.

Therefore, there is a wick type combustor in which fuel is vaporized by a vaporizer of a porous material such as glass wool and supplied, and in this system, although the flame stability is good, the combustion is turned on,
It has the drawback that it cannot be turned off quickly. Therefore,
If this is installed in the intake passage of the engine, black smoke from the engine body frequently occurs when the load of the engine is increased, so this method cannot be installed in the intake passage of the engine.

As another conventional example, a combustion device as disclosed in Japanese Examined Patent Publication No. 58-2330 has been proposed, but this combustion device is a stationary type used for household and industrial purposes, and it is difficult to miniaturize it. As such, it is not used in transport machinery like engine warm-up devices.

Further, according to this combustion device, the temperature of the vaporized fuel passing through the combustion input pipe is lowered while the fuel vaporized in advance is sent to the combustion space, and when the fuel reaches the fuel distribution chamber, There is a problem that a part of the fuel is liquefied again and the fuel particles ejected from the ejection port into the fuel space become large, making it difficult to obtain complete combustion.

Furthermore, according to this combustion device, the swirl generated in the combustion space causes the fuel ejected from the ejection port to converge on the central portion of the combustion space, and the flame concentrates on this central portion and remains on the peripheral portion of the combustion space. However, there is a problem in that the combustion gas containing unburned components flows out from the outlet because it is not sufficiently mixed with the generated air.

[Object of the Invention]

It is an object of the present invention to provide an excellent engine warm-up device that solves the problems of the conventional engine warm-up device and allows stable combustion in a combustor provided in the intake passage of the engine. .

[Structure of Invention]

The engine warm-up device of the present invention which achieves the above-mentioned object, expands a part of the intake passage of the engine and provides a hollow combustor therein, and the combustor is made of a porous material that promotes vaporization of fuel. It is divided into a front chamber and a rear chamber by a partition wall, and a vaporized vapor supply pipe for supplying a fuel vaporized in advance is connected to the front chamber,
A spark plug is provided in the rear chamber, and a plurality of intake air inlets are opened in the side wall of a combustor forming the rear chamber so as to generate swirl in the rear chamber, and a circumferential sectional area of the rear chamber is formed. An outlet having a smaller opening area and provided eccentrically with respect to the center of the rear chamber is formed in the rear chamber.

〔Example〕

 Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the structure of an engine warm-up device of the present invention, where E is the engine, M is the intake manifold, and K is the intake pipe.

In the present invention, the predetermined portion of the intake pipe K is expanded,
The combustor 1 is built in the expanded portion 20. More specifically, the expanding portion 20 is expanded into two stages of a large diameter on the front side of the intake pipe K and a small diameter on the rear side, and the combustor 1 is fitted and attached to the expanding portion 21 of the small diameter. And large diameter expansion part
From 22, a stay 23 and a holder 24 support the combustor so as to be located at the central portion of the large-diameter widening portion 22.

The combustor 1 is made of a heat-resistant material such as ceramics, and the inside thereof is hollow, and the inside of the combustor 1 is formed by a partition wall 5 made of a vaporization promoting material having a honeycomb structure, for example, a heat-resistant material such as ceramics. It is divided into 2 rooms.

The rear chamber 3 partitioned by the partition wall 5 is a combustion chamber,
As shown in FIG. 2, a plurality of intake inlets 6 are provided on the side surface of the combustor body 2 at predetermined intervals. The intake air inlet 6 has a certain inclination angle α with respect to the center axis of the combustor body 2, and the intake air flowing into the rear chamber 3 from the intake air inlet 6 causes a swirl therein. ing. Further, a glow plug 8 for ignition is provided on the same circumference of the main body 2 in which the intake air inlet 6 is provided so as to penetrate the expanding portion 20 and the combustor main body 2, and the tip thereof. The heating section 8a is located near the center of the combustor 1. Further, an outlet 7 communicating with the intake pipe K is provided on the rear surface of the rear chamber 3. The outlet 7 is arranged so that its center line R is open at a position that is eccentric to the center axis T of the rear chamber 3, and the fuel mixture in the rear chamber 3 is swirled to the rear chamber. It converges on the central part of 3 and prevents the flame flow from concentrating on this central part. Then, in the vicinity of the outlet 7 of the rear chamber 3, the flame flow is diffused to the peripheral portion of the rear chamber 3, and the unburned fuel mixture is burned by the air remaining in the peripheral portion.

Further, the outlet 7 has an opening area larger than that of the circumferential cross-sectional area of the rear chamber 3 so as not to flow into the intake pipe K on the downstream side before the fuel mixture in the rear chamber 3 is completely combusted. A flame flow formed by igniting the fuel mixture is retained in the rear chamber 3 to some extent so as to completely burn the fuel mixture.

Further, the front chamber 4 partitioned by the partition wall 5 is a fuel vaporization chamber, which penetrates the expansion portion 20 and the combustor body 2 from the downstream side of the intake passage K and passes through the rear chamber 3 to further A tip portion of a vaporized vapor supply pipe 9 for fuel that penetrates the partition wall 5 and reaches the front chamber 4.
9a is located and the fuel injection port provided at this tip 9a
Fuel is supplied to the front chamber 4 from 9b.
The fuel injection port 9b is not limited to one, but a plurality may be provided. Further, outside the expanding portion 20 of the vaporized vapor supply pipe 9, a vaporization heat supply device 10 is provided in the fuel passage 9c thereof, inserted from the rear end 9d of the vaporized vapor supply pipe 9. Similarly, outside the expanding portion 20, the vaporized vapor supply pipe 9 near the tip of the vaporization heat supply device 10 has a fuel introduction pipe.
11 connected.

In the engine warm-up device of the present invention configured as described above, the intake air A flowing through the intake pipe K is dispersed around the combustor 1 at the expansion portion 20 and provided in the combustor body 2. The air flows into the rear chamber 3 through the intake air inlet 6 while swirling, flows out from the air outlet 7 into the intake pipe K, and is supplied to the engine E.

Therefore, if the fuel from the fuel pump 12 attached to the engine E is supplied to the fuel passage 9c of the vaporized vapor supply pipe 9 via the fuel supply pipe 11 at the time of engine startup, this fuel is supplied by the vaporization heat supply device 10. It is heated and vaporized into fuel vapor. This fuel vapor passes through the fuel passage 9c and is introduced into the front chamber 4, which is a vaporization chamber, from the fuel injection port 9b provided at the tip portion 9a of the vaporized vapor supply pipe 9. At this time, the fuel injection port 9b
Is more uniformly diffused into the front chamber 4 when there are a plurality of jet outlets than there is a single jet outlet. In this way, the fuel vapor introduced into the front chamber 4 fills the front chamber 4 and is mixed with a small amount of air flowing from the rear chamber 3 through the porous partition wall 5 to form a fuel mixture, The light penetrates from the entire wall surface of the partition wall 5 to the rear chamber 3.

Further, when the fuel mixture introduced into the rear chamber 3 burns,
Combustion radiant heat is generated, and the porous partition wall 5 is heated by this radiant radiant heat, and as a result, vaporization is promoted so that the particles of the fuel vapor in the front chamber 4 are further fined.

The glow plug 8 for ignition is provided in the rear chamber 3 as described above, and the glow plug 8 is provided in the rear chamber 3 as described above.
Since there is a swirl from the intake inlet 6 toward the tip side of the engine, if the glow plug 8 is energized when the engine is warmed up, the fuel mixture is carried to this swirl and becomes a glow plug. It comes into contact with the tip portion 8a of 8 and burns immediately. At this time, the fuel mixture burns well due to the swirl regardless of the amount of fuel.

Further, the outlet 7 of the rear chamber 3 has the center line R as described above.
Are arranged so as to open at positions that are somewhat eccentric with respect to the central axis T of the rear chamber 3, and the opening area is formed smaller than the circumferential cross-sectional area of the rear chamber 3. Due to the synergistic effect of, it is possible to always stably and completely burn the fuel mixture.

When the combustion occurs in the rear chamber 3 in this way, the vaporized vapor supply pipe 9 exposed in the rear chamber 3 is warmed by the combustion radiant heat in the rear chamber 3, and the vaporization of the fuel therein is further promoted. To be done.

The combustion of the fuel in the combustor 1 is performed by the fuel introduction pipe 11
As soon as the supply of fuel to the
If the fuel supply to 11 is stopped, it can be stopped immediately.

As described above, in the engine warm-up device of the present invention, the combustion is repeatedly turned on and off according to the characteristics required for the combustor 1, that is, the engine load. It must meet all of the following requirements: that the flame burns stably without being affected by an increase or decrease in the air flow, and that the fuel and air are mixed sufficiently for efficient combustion. it can.

〔The invention's effect〕

As described above, the engine warm-up device of the present invention is provided with a hollow combustor in which a part of the intake passage of the engine is expanded, and the combustor is made of a porous material that promotes vaporization of fuel. It is divided into a front chamber and a rear chamber by a partition wall, and a vaporized vapor supply pipe for supplying a fuel vaporized in advance is connected to the front chamber,
A spark plug is provided in the rear chamber, and a plurality of intake air inlets are opened in the side wall of a combustor forming the rear chamber so as to generate swirl in the rear chamber, and a circumferential sectional area of the rear chamber is formed. Since an outlet having a smaller opening area and provided eccentrically with respect to the center of the rear chamber is formed in the rear chamber, the following effects can be obtained.

The fuel sent from the vaporized vapor supply pipe to the front chamber is promoted to be vaporized by the heat of the porous partition wall, permeates the porous partition wall and is introduced into the rear chamber from the entire surface. Then, the intake air flowing into the rear chamber from the intake air inlet generates a swirl to promote the combustion of the vaporized fuel introduced into the rear chamber.

Further, the outlet of the rear chamber of the combustor is provided so as to open at a position eccentric to the center of the rear chamber, and the opening area thereof is smaller than the circumferential sectional area of the rear chamber. Since they are formed, their synergistic effect can always stably and completely burn the fuel mixture.

Furthermore, while maintaining such a stable combustion state, the start and stop of combustion can be quickly performed according to the load of the engine, and the air and fuel are sufficiently mixed and the air flow Since the flame burns stably without being affected by the increase and decrease, there is an effect that the generation of soot and the generation of unstable gas can be suppressed during the warm-up operation of the engine.

[Brief description of drawings]

FIG. 1 is a schematic view including a cross-sectional view of a combustor showing a configuration of an engine warm-up device of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 ... combustor, 3 ... rear chamber, 4 ... front chamber, 5 ... bulkhead,
6 ... intake inlet, 7 ... outlet, 8 ... glow plug, 9 ... vaporized vapor supply pipe, 10 ... vaporization heat supply device, 11
…… Fuel introduction pipe, 13 …… Intake inlet, 20 …… Expansion part, E
…… Engine, K …… Intake pipe, M …… Intake manifold.

Claims (1)

[Claims] 1. An engine intake passage is partially expanded to provide a hollow combustor therein, and the combustor is divided into a front chamber and a rear chamber by a porous partition wall which promotes vaporization of fuel. A vaporized steam supply pipe for supplying a vaporized fuel to the front chamber is connected to the front chamber, and an ignition plug is provided in the rear chamber so as to project into the rear chamber. Open multiple intake inlets to generate swirl,
Having an opening area smaller than the circumferential cross-sectional area of the rear chamber,
Further, the engine warming device is characterized in that an outflow port provided eccentrically to the center of the rear chamber is formed in the rear chamber.