JP3046897B2 - Large side injection methanol engine - Google Patents
Large side injection methanol engineInfo
- Publication number
- JP3046897B2 JP3046897B2 JP5195602A JP19560293A JP3046897B2 JP 3046897 B2 JP3046897 B2 JP 3046897B2 JP 5195602 A JP5195602 A JP 5195602A JP 19560293 A JP19560293 A JP 19560293A JP 3046897 B2 JP3046897 B2 JP 3046897B2
- Authority
- JP
- Japan
- Prior art keywords
- methanol
- spray
- engine
- main
- combustion chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/14—Direct injection into combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Description
【０００１】[0001]
【産業上の利用分野】本発明は大形２サイクル式直噴メ
タノールエンジンの燃焼室の構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of a combustion chamber of a large two-cycle direct injection methanol engine.
【０００２】[0002]
【従来の技術】従来例を図４によって説明する。図４は
従来例の燃焼室の断面図である。特願平３−８７２３３
に記されているように主燃焼室Ａと２つの副燃焼室Ｂ
１，Ｂ２を持ち、副燃焼室Ｂ１，Ｂ２内に副燃料弁１，
２から噴射されたメタノールパイロット噴霧Ｃ，Ｄは副
燃焼室Ｂ１，Ｂ２内に挿入されたグロープラグ３，４に
より着火燃焼させられ、燃焼ガスとなって噴口部５，６
から主燃焼室Ａ内に噴出し主燃料弁７，８からのメタノ
ール主噴霧を着火させる。2. Description of the Related Art A conventional example will be described with reference to FIG. FIG. 4 is a sectional view of a conventional combustion chamber. Japanese Patent Application No. 3-87233
The main combustion chamber A and the two sub-combustion chambers B
1 and B2, and the auxiliary fuel valves 1 and 2 are provided in the auxiliary combustion chambers B1 and B2.
2 are ignited and burned by glow plugs 3 and 4 inserted in the sub-combustion chambers B1 and B2, and are turned into combustion gas to form injection ports 5, 6.
To ignite the main spray from the main fuel valves 7 and 8 into the main combustion chamber A.
【０００３】[0003]
【発明が解決しようとする課題】従来の大形２サイクル
メタノールエンジンが副燃焼室を採用しているのはパイ
ロット噴霧の安定着火とグロープラグの信頼性確保のた
めである。しかし主燃焼室と副燃焼室との間には、噴口
部と云う絞りが存在するため熱効率の改善難と副燃焼室
の熱的信頼性の懸念がある。また副燃焼室構造とするこ
とはエンジン全体の価格を押し上げると云う欠点があ
る。本発明の目的は前記欠点を解消し、直噴式エンジン
で着火の安定性とグロープラグの信頼性が確保できる大
形サイドインジェクション方式メタノールエンジンを提
供することにある。The conventional large two-stroke methanol engine employs the auxiliary combustion chamber for the purpose of ensuring stable ignition of pilot spray and ensuring the reliability of the glow plug. However, there is a restriction called an injection port between the main combustion chamber and the sub-combustion chamber, so that it is difficult to improve the thermal efficiency and there is a concern about the thermal reliability of the sub-combustion chamber. Further, the use of the sub-combustion chamber structure has a disadvantage that the price of the entire engine is increased. SUMMARY OF THE INVENTION An object of the present invention is to provide a large-sized side-injection type methanol engine which solves the above-mentioned drawbacks and can secure ignition stability and glow plug reliability in a direct injection engine.
【０００４】[0004]
【課題を解決するための手段】メタノール１００％を燃
料とするサイドインジェクション方式の大形２サイクル
直噴メタノールエンジンにおいて、エンジン中心に対し
て点対称に噴射されるメタノール主噴霧を主燃焼室内の
スワールと同一方向の成分を有する方向に噴射するよう
に配置された複数の主燃料弁と、シリンダカバー内に設
けられた円錐台状のくぼみを有する噴霧ガイドを介して
主燃焼室内のエンジン中心に対して点対称に配置されパ
イロット噴射を受け持ちスワール方向成分を有するもの
の略エンジン中心に向うメタノール主噴霧に最短距離で
到達するパイロットメタノール噴霧を噴射する複数の副
燃料弁と、前記噴霧ガイド内に前記副燃料弁から噴射さ
れるパイロットメタノール噴霧の両側に１個宛対をなし
て挿入されたグロープラグ対とを有してなることを特徴
とする。Means for Solving the Problems In a large-sized two-cycle direct injection methanol engine of side injection type using 100% methanol as fuel, a methanol main spray injected point-symmetrically with respect to the center of the engine is swirled in a main combustion chamber. And a plurality of main fuel valves arranged to inject in a direction having the same direction as the component, and a spray guide having a truncated conical recess provided in the cylinder cover with respect to the center of the engine in the main combustion chamber. A plurality of sub-fuel valves for injecting a pilot methanol spray which is arranged symmetrically with respect to the pilot injection and has a swirl direction component, but which reaches the methanol main spray in the shortest distance toward the center of the engine, and the sub-fuel valve in the spray guide. Grooves inserted in pairs on both sides of the pilot methanol spray injected from the fuel valve And characterized by having a plug pairs.
【０００５】[0005]
【作用】シリンダカバー内に設けられた円錐台状のくぼ
みである噴霧ガイドの内部は主燃焼室を旋回するスワー
ルの直接の影響を受けないため、前記噴霧ガイド中に装
着されているグロープラグ２個もスワールによる過度の
冷却を受けない。またグロープラグは噴霧の両側に１個
宛対となっているので熱容量が２倍になり、グロープラ
グ表面温度は同じでも着火の確率は高く、特に低負荷域
の燃焼が大巾に改善される可能性が高い。更にメタノー
ル主噴霧が燃焼を開始すると大きな火炎がスワールに乗
って主燃焼室内を旋回するため、旋回域内にあるものに
たいして多量の熱が流入することになる。The interior of the spray guide, which is a truncated conical recess provided in the cylinder cover, is not directly affected by the swirl swirling through the main combustion chamber, and therefore the glow plug 2 mounted in the spray guide is not affected. Neither does it undergo excessive swirl cooling. In addition, since the glow plug has one pair on each side of the spray, the heat capacity is doubled, and the probability of ignition is high even if the surface temperature of the glow plug is the same, and particularly the combustion in the low load region is greatly improved. Probability is high. Further, when the methanol main spray starts burning, a large flame swirls on the swirl in the main combustion chamber, so that a large amount of heat flows into the inside of the swirl zone.
【０００６】しかし本発明のグロープラグは噴霧ガイド
内にあるため、前記熱の影響に対しても間接的となりグ
ロープラグの表面温度が急激に変動することなく、所謂
熱衝撃や熱疲労を深刻に受けることはない。グロープラ
グの耐久性の大きな問題はこの熱衝撃と熱疲労とも云わ
れており、これを噴霧ガイドは緩和できる。However, since the glow plug of the present invention is in the spray guide, it is indirect to the influence of the heat, and the surface temperature of the glow plug does not fluctuate rapidly, so that so-called thermal shock and thermal fatigue are seriously affected. I will not receive it. The major problem of the durability of the glow plug is also called thermal shock and thermal fatigue, which can be mitigated by the spray guide.
【０００７】[0007]
【実施例】本発明に係る実施例を図１〜３によって説明
する。図１は実施例の主燃焼室の主燃料弁を含む断面
図、図２は実施例における主燃焼室の両副燃料弁１，２
と両グロープラグ３，４を含む断面図、図３は同主燃焼
室の平面図である。本実施例は大形２サイクル直噴式メ
タノールエンジンであり、主燃焼室ＡはピストンＸ，シ
リンダカバーＵ，排気弁Ｗでかこまれた空間である。主
燃焼室Ａ内にエンジン中心ＥＣに対して点対称に主燃料
弁７，８が配置されている。Ｚ１，Ｚ２，Ｚ３，Ｙ１，
Ｙ２，Ｙ３はそれぞれメタノール主噴霧でスワールＳＷ
と同一成分を有する方向に噴射されている。１，２は副
燃料弁でシリンダカバーＵに主燃焼室Ａと連通して設け
られ円錐状クボミを有する噴霧ガイドＧ１，Ｇ２ととも
にエンジン中心ＥＣに対して点対称に配置されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view including a main fuel valve of a main combustion chamber according to an embodiment, and FIG.
And FIG. 3 is a plan view of the main combustion chamber. This embodiment is a large two-cycle direct injection methanol engine, and a main combustion chamber A is a space surrounded by a piston X, a cylinder cover U, and an exhaust valve W. In the main combustion chamber A, main fuel valves 7, 8 are arranged point-symmetrically with respect to the engine center EC. Z1, Z2, Z3, Y1,
Y2 and Y3 are swirl SW with methanol main spray respectively.
Is injected in the direction having the same component as Reference numerals 1 and 2 denote auxiliary fuel valves, which are provided in the cylinder cover U in communication with the main combustion chamber A, and are arranged point-symmetrically with respect to the engine center EC together with the spray guides G1 and G2 having conical concave portions.
【０００８】３，４はグロープラグ対で、それぞれグロ
ープラグ３Ａ，３Ｂ及びグロープラグ４Ａ，４Ｂから成
り、噴霧ガイドＧ１，Ｇ２内にそれぞれのグロープラグ
対３，４がパイロットメタノール噴霧Ｃ，Ｄを挟み、且
つ主燃焼室Ａ内のスワールＳＷの直接の影響を受けない
ように配置されている。副燃料弁１，２から噴射される
パイロットメタノール噴霧Ｃ，ＤはスワールＳＷ方向成
分を有し、且つ略エンジン中心ＥＣ方向を向き、メタノ
ール主噴霧Ｚ１，Ｚ２，Ｚ３，Ｙ１，Ｙ２，Ｙ３に最短
距離で接触する方向を指向している。Glow plug pairs 3 and 4 are composed of glow plugs 3A and 3B and glow plugs 4A and 4B, respectively. Glow plug pairs 3 and 4 respectively provide pilot methanol sprays C and D in spray guides G1 and G2. It is arranged so as not to be directly affected by the swirl SW in the main combustion chamber A. The pilot methanol sprays C and D injected from the auxiliary fuel valves 1 and 2 have a swirl SW direction component, and are directed substantially toward the engine center EC, and are the shortest to the methanol main sprays Z1, Z2, Z3, Y1, Y2, and Y3. It is oriented in the direction of contact at a distance.
【０００９】[0009]
【発明の効果】大形２サイクル直噴式メタノールエンジ
ンで従来の副室式ディーゼルエンジンなみの着火性が期
待できる上、直噴式の特徴である熱効率の良さも有す
る。更にグロープラグの耐久性が確保できるため極めて
理想的な大形２サイクルメタノールエンジンを提供でき
る。このことは、長時間の耐久性と最高の熱効率及び低
公害性を条件とする事業用発電プラントや大形舶用主機
として使用を可能にするものである。According to the present invention, a large two-stroke direct injection methanol engine can be expected to have the same ignitability as a conventional sub-chamber diesel engine, and has a high thermal efficiency which is a characteristic of the direct injection type. Further, since the durability of the glow plug can be ensured, a very ideal large two-stroke methanol engine can be provided. This makes it possible to use it as a commercial power plant or a large marine engine, which requires long-term durability, maximum thermal efficiency and low pollution.
【図１】本発明の実施例における燃焼室の主燃料弁を含
む断面図。FIG. 1 is a sectional view including a main fuel valve of a combustion chamber in an embodiment of the present invention.
【図２】同燃焼室の両副燃料弁と両グロープラグを含む
断面図。FIG. 2 is a cross-sectional view including both sub fuel valves and both glow plugs of the combustion chamber.
【図３】同燃焼室の平面図。FIG. 3 is a plan view of the combustion chamber.
【図４】従来例の燃焼室の断面図。FIG. 4 is a sectional view of a conventional combustion chamber.
１，２…副燃料弁、３，４…グロープラグ対、３Ａ，３
Ｂ，４Ａ，４Ｂ…グロープラグ、７，８…主燃料弁、Ｇ
１，Ｇ２…噴霧ガイド、Ｕ…シリンダカバー、Ａ…主燃
焼室、ＳＷ…スワール、ＥＣ…エンジン中心、Ｃ，Ｄ…
パイロットメタノール噴霧、Ｚ１，Ｚ２，Ｚ３，Ｙ１，
Ｙ２，Ｙ３…メタノール主噴霧。1,2 ... Auxiliary fuel valve, 3,4 ... Glow plug pair, 3A, 3
B, 4A, 4B: glow plug, 7, 8: main fuel valve, G
1, G2: spray guide, U: cylinder cover, A: main combustion chamber, SW: swirl, EC: engine center, C, D ...
Pilot methanol spray, Z1, Z2, Z3, Y1,
Y2, Y3: Methanol main spray.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｆ０２Ｍ 61/14 ３１０ Ｆ０２Ｍ 61/14 ３１０Ｖ (72)発明者 下田 邦彦 神奈川県横浜市中区錦町12番地 三菱重 工業株式会社横浜研究所内 (56)参考文献 特開 平４−301183（ＪＰ，Ａ) 特開 昭59−70874（ＪＰ，Ａ) 実開 平１−85470（ＪＰ，Ｕ) 実開 昭61−140124（ＪＰ，Ｕ) 実開 昭62−45339（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02B 23/00 - 23/06 F02M 61/14 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification code FI F02M 61/14 310 F02M 61/14 310V (72) Inventor Kunihiko Shimoda 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries Yokohama, Ltd. (56) References JP-A-4-301183 (JP, A) JP-A-59-70874 (JP, A) JP-A-1-85470 (JP, U) JP-A-61-140124 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) F02B 23/00-23/06 F02M 61/14
Claims (1)
インジェクション方式の大形２サイクル直噴メタノール
エンジンにおいて、エンジン中心（ＥＣ）に対して点対
称に噴射されるメタノール主噴霧（Ｚ１，Ｚ２，Ｚ３，
Ｙ１，Ｙ２，Ｙ３）を主燃焼室（Ａ）内のスワール（Ｓ
Ｗ）と同一方向の成分を有する方向に噴射するように配
置された複数の主燃料弁（７，８）と、シリンダカバー
（Ｕ）内に設けられた円錐台状のくぼみを有する噴霧ガ
イド（Ｇ１，Ｇ２）を介して主燃焼室（Ａ）内のエンジ
ン中心（ＥＣ）に対して点対称に配置されパイロット噴
射を受け持ちスワール（ＳＷ）方向成分を有するととも
に略エンジン中心（ＥＣ）に向うメタノール主噴霧（Ｚ
１，Ｚ２，Ｚ３，Ｙ１，Ｙ２，Ｙ３）に最短距離で到達
するパイロットメタノール噴霧（Ｃ，Ｄ）を噴射する複
数の副燃料弁（１，２）と、前記噴霧ガイド内に副燃料
弁（１，２）から噴射されるパイロットメタノール噴霧
（Ｃ，Ｄ）の両側に１個宛対をなして挿入されたグロー
プラグ対（３，４）とを有してなる大形サイドインジェ
クション方式メタノールエンジン。1. A large-sized two-cycle direct injection methanol engine of a side injection system using 100% methanol as a fuel, wherein a methanol main spray (Z1, Z2, Z3) injected point-symmetrically with respect to the engine center (EC).
Y1, Y2, Y3) are swirl (S) in the main combustion chamber (A).
A plurality of main fuel valves (7, 8) arranged to inject in a direction having the same component as W), and a spray guide () having a truncated conical recess provided in the cylinder cover (U). G1 and G2), the methanol is arranged point-symmetrically with respect to the engine center (EC) in the main combustion chamber (A), receives pilot injection, has a swirl (SW) direction component, and is substantially directed toward the engine center (EC). Main spray (Z
1, Z2, Z3, Y1, Y2, Y3), a plurality of sub-fuel valves (1, 2) for injecting pilot methanol spray (C, D) reaching the shortest distance, and a sub-fuel valve ( Large side-injection type methanol engine having glow plug pairs (3, 4) inserted in pairs on both sides of pilot methanol spray (C, D) injected from (1, 2) .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5195602A JP3046897B2 (en) | 1993-07-14 | 1993-07-14 | Large side injection methanol engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5195602A JP3046897B2 (en) | 1993-07-14 | 1993-07-14 | Large side injection methanol engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0734880A JPH0734880A (en) | 1995-02-03 |
| JP3046897B2 true JP3046897B2 (en) | 2000-05-29 |
Family
ID=16343891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5195602A Expired - Fee Related JP3046897B2 (en) | 1993-07-14 | 1993-07-14 | Large side injection methanol engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3046897B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2891779B1 (en) * | 2012-08-31 | 2020-11-18 | IHI Corporation | Uniflow scavenging two-cycle engine |
-
1993
- 1993-07-14 JP JP5195602A patent/JP3046897B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2891779B1 (en) * | 2012-08-31 | 2020-11-18 | IHI Corporation | Uniflow scavenging two-cycle engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0734880A (en) | 1995-02-03 |
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