JPS5968552A - Fuel circulating device for diesel engine - Google Patents

Fuel circulating device for diesel engine

Info

Publication number
JPS5968552A
JPS5968552A JP18011782A JP18011782A JPS5968552A JP S5968552 A JPS5968552 A JP S5968552A JP 18011782 A JP18011782 A JP 18011782A JP 18011782 A JP18011782 A JP 18011782A JP S5968552 A JPS5968552 A JP S5968552A
Authority
JP
Japan
Prior art keywords
fuel
valve
circulation
pipe
oil
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.)
Granted
Application number
JP18011782A
Other languages
Japanese (ja)
Other versions
JPH0226703B2 (en
Inventor
Tatsuo Yoshida
達夫 吉田
Shigeki Miyaji
茂樹 宮地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Priority to JP18011782A priority Critical patent/JPS5968552A/en
Publication of JPS5968552A publication Critical patent/JPS5968552A/en
Publication of JPH0226703B2 publication Critical patent/JPH0226703B2/ja
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

PURPOSE:To prevent a high pressure fuel pipe from clogging and fuel oil from adhering, by circulating the fuel oil even at the time of stopping of an engine by providing a route circulating within the high pressure fuel pipe and a valve in a diesel engine making use of low quality fuel. CONSTITUTION:A piston valve 13 is closed and fuel is made to flow into a central hole 25 of a valve stem 17 at the time of suspension of a diesel engine 2. In this instance, as fuel pressure in a fuel supply duct 26 is low, a nozzle hole 28 is turned into an open state, fuel oil is circulated by a route of a nozzle hole 28, a circulating fuel oil duct 27, a circulating fuel oil tube 15, a check valve 16 and a mixing tank 1, and as the fuel oil is flowing even if the diesel engine is being suspended matters that high pressure fuel pipe 12 is clogged or the fuel oil is sticked are eliminated. If the piston valve 13 is kept open when high quality fuel whose viscosity is low is used, the fuel is circulated through the route of the mixing tank 1, a fuel supply pipe 9, a booster pump 10, a fuel pump 11, the piston valve 13 and a fuel return pipe 14.

Description

【発明の詳細な説明】 重油を使用する場合、燃料高圧管が閉塞しなし・ように
するためのディーゼル機関の燃料循環装置に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel circulation system for a diesel engine to prevent a high pressure fuel pipe from clogging when heavy oil is used.

最近テイーゼル機関においては、高粘度の粗悪重油を燃
料として使用することが特に多(なっている。ところが
高粘度の重油を燃料として使用しているディーゼル機関
を停止しているときには、燃料ポンプから燃料噴射弁に
燃料を送る燃料高圧管が閉塞したり固着したりする懸念
がある。このため従来たおいては、循環機能を内蔵した
燃料弁を使用するか、あるいは独立の循環弁を使用して
ディーゼル機関停止時においても燃料を循環させ、燃料
高圧管の閉塞を防止していた。しかし、循環機能を内蔵
した燃料弁を使用したものは、高粘度の燃料油を使わな
い場合でも複雑な構造の燃料弁の使用を継続しなげれば
ならず、独立の循環弁を使用したものは、循環弁独自で
は作動できる機能を持っておらず圧縮空気等の制御媒体
を必要とし、構造も複雑で価格も高くなる欠点があった
Recently, high viscosity, poor quality heavy oil is often used as fuel in tasel engines. There is a concern that the high-pressure fuel pipe that sends fuel to the injection valve may become clogged or stuck.For this reason, conventional methods have been to use a fuel valve with a built-in circulation function or to use an independent circulation valve. Even when the diesel engine is stopped, fuel is circulated and the high pressure fuel pipe is prevented from clogging.However, models that use a fuel valve with a built-in circulation function have a complicated structure even when high viscosity fuel oil is not used. The fuel valve must continue to be used, and those that use an independent circulation valve do not have the function to operate on their own, require a control medium such as compressed air, and have a complicated structure. It also had the disadvantage of being expensive.

本発明このような従来の欠点を除去し、簡単な機構で燃
料高圧管の閉塞を防止することを目的とし、燃料ポンプ
より燃料高圧管を介して送られて来た燃料を燃料噴射弁
に供給する循環弁本体と、逆止弁を有し循環弁本体をミ
キシングタンクに接続する循環油管と、循環弁本体内に
設けられ、燃料噴射弁に対する燃料供給圧力に応じて燃
料高圧管と循環油管との間を連通したり遮断したりする
循環弁とを備えたディーゼル機関の燃料循環装置に係る
ものである。
The present invention aims to eliminate such conventional drawbacks and prevent blockage of the fuel high pressure pipe with a simple mechanism, and supplies fuel sent from the fuel pump via the fuel high pressure pipe to the fuel injection valve. a circulation valve main body, a circulation oil pipe having a check valve and connecting the circulation valve main body to a mixing tank, and a fuel high pressure pipe and a circulation oil pipe provided in the circulation valve main body depending on the fuel supply pressure to the fuel injection valve. This invention relates to a fuel circulation system for a diesel engine, which is equipped with a circulation valve that communicates with or shuts off the air.

次に本発明の二実施例を第1図について説明すると、(
1)はミキシングタンクであって、燃料が入れられてい
るものである。(2)はディーゼル機関であって、(3
)はシリンダライナー、(4)はシリンダカバー、(5
)はピストン、(6)は燃焼室である。シリンダカバー
(4)の上部中央には燃料噴射弁(力が設けてあって、
これに循環弁本体(8)が取り付けられている。循環弁
本体(8)については、後に詳述する。
Next, two embodiments of the present invention will be explained with reference to FIG.
1) is a mixing tank that contains fuel. (2) is a diesel engine, and (3
) is the cylinder liner, (4) is the cylinder cover, (5
) is the piston, and (6) is the combustion chamber. There is a fuel injection valve (forced) in the center of the upper part of the cylinder cover (4).
A circulation valve main body (8) is attached to this. The circulation valve body (8) will be described in detail later.

ミキシングタンク(1)は燃料供給管(9)、ブースタ
ーポンプ(10)を介して燃料ポンプ+l++に接続さ
れており、燃料ポンプ0υは燃料高圧管0りを介して循
環弁本1体(8)に接続されると共に、ピストン弁03
)、燃料灰油管(141を介してミキシングタンク(1
)に接続されている。循環弁本体(8)は、循環油管0
9、逆止弁α6)、を介してミキシングタンク(1)に
接続されている。
The mixing tank (1) is connected to a fuel pump +l++ via a fuel supply pipe (9) and a booster pump (10), and the fuel pump 0υ is connected to a circulation valve body (8) via a fuel high pressure pipe. and piston valve 03
), the mixing tank (1
)It is connected to the. The circulation valve body (8) is connected to the circulation oil pipe 0.
9, is connected to the mixing tank (1) via a check valve α6).

第2図に示すように、循環弁本体(8)には弁棒(17
)がポル) Q81によって取シ付げられており、弁棒
(lηの第2図左方の細径部には循環弁用弁09が密に
摺動できるように嵌められている。循環弁用弁0謁の外
周面は循環弁本体(8)に形成されたシリンダ(20)
に接していて、循環弁用弁09)に嵌めであるシールリ
ング(2I)によりシールされた状態で摺動するように
なっている。循環弁用弁0■の第2図における右側面と
弁棒(17+との間には、調整シム(2つを介してスプ
リングc23)が挿入されていて、循環弁用弁0[株]
を循環弁本体(8)のシリンダ斜面t24)に押し付け
るように伺勢している。
As shown in Figure 2, the circulation valve body (8) has a valve stem (17
) is attached by Q81, and the circulation valve valve 09 is fitted into the narrow diameter part on the left side of the valve stem (lη in Figure 2) so that it can slide tightly.Circulation valve The outer peripheral surface of the circulation valve is a cylinder (20) formed in the circulation valve body (8).
It is in contact with the circulation valve valve 09) and slides in a sealed state by a seal ring (2I) fitted into the circulation valve valve 09). An adjusting shim (a spring C23 is inserted through the two) is inserted between the right side surface and the valve stem (17+) in Figure 2 of the circulation valve valve 0■.
is pressed against the cylinder slope t24) of the circulation valve body (8).

弁棒(17)の中心軸線に沿って中心孔(25)が穿設
されており、中心孔C9の右端には第1図に示しだ燃料
高圧管(1渇が接続されており、中心孔(2勺の左端は
循環弁本体(8)に穿設されている燃料供給通路(26
)を介して燃料噴射弁(7)に通じている。
A center hole (25) is bored along the center axis of the valve stem (17), and a fuel high pressure pipe (1) shown in Fig. 1 is connected to the right end of the center hole C9. (The left end of the two holes is the fuel supply passage (26) bored in the circulation valve body (8).
) to the fuel injection valve (7).

弁棒07)の側面には循環油路(27)が穿設されてし
・て、この循環油路(2′I)には第1図に示した循環
油管(1句が接続されている。また前述した中心孔(2
51は、ノズル孔[28)を介して循環油路e力につな
がっている。
A circulation oil passage (27) is bored in the side of the valve stem 07), and a circulation oil pipe (1 line) shown in Fig. 1 is connected to this circulation oil passage (2'I). .Also, the center hole (2
51 is connected to the circulation oil passage e through the nozzle hole [28].

燃料供給通路t2B)内の燃料圧力が一定値以下のとぎ
には、第2図に示すようにスプリング(23)の力によ
って循環弁用弁OSがシリンダ斜面(2)に押し付けら
れ、循環弁用弁([3はノズル孔(至)から外れた位置
にあって中心孔0句はノズル孔し8)を介して循環油路
(27)に連通している。ところが燃料供給通路QG内
の燃料圧力が一定値以上になると、循環弁用弁部はスプ
リング(23)の力に抗して第2図の右方に押圧され、
ストローク翰だけ第2図の右方に移動して弁棒(17)
の段部(至)に当接し、ノズル孔(ハ)を閉塞して中心
孔C9と循環油路(2℃との間を遮断するようになる。
When the fuel pressure in the fuel supply passage t2B) is below a certain value, the circulation valve valve OS is pressed against the cylinder slope (2) by the force of the spring (23) as shown in FIG. It communicates with the circulation oil passage (27) via a valve ([3 is located at a position away from the nozzle hole (to) and the center hole 0 is the nozzle hole 8). However, when the fuel pressure in the fuel supply passage QG exceeds a certain value, the circulation valve valve part is pushed to the right in FIG. 2 against the force of the spring (23).
Move only the stroke rod to the right in Figure 2 and insert the valve stem (17).
The nozzle hole C9 is brought into contact with the stepped portion (to), and the nozzle hole (c) is closed, thereby blocking the connection between the center hole C9 and the circulation oil path (2° C.).

第1図に示したピストン弁(Ii a−i、第6図に示
す制御回゛路によって開閉されるようになっている。第
6図において制御室C31)には電源表示灯(32、ス
イッチl33)、表示灯(34)が設けられている。制
御室(31)において電源表示灯(32の点灯により電
源があることを確認し、スイッチ(33)をオンにする
と電磁弁051は励磁されて第6図の右方に変位し、制
御空気ライン(361からの圧縮空気は電磁弁C35)
を通ってピストン弁(13)を閉じた状態にする。ピス
トン弁α■が閉じると表示灯04)は点灯する。スイッ
チ(33)をオフにすると電磁弁(3つは第6図に示す
位置に復帰し、ピストン弁(13)に供給されていた圧
縮空気は排出されてピストン弁(1■は開いた状態にな
る。このときには、表示灯(34)は消灯する。
The piston valves (Ii a-i shown in Fig. 1) are opened and closed by the control circuit shown in Fig. 6.The power indicator light (32, switch l33) and an indicator light (34) are provided. In the control room (31), confirm that there is a power source by turning on the power indicator light (32), and turn on the switch (33). The solenoid valve 051 is excited and moves to the right in Fig. 6, and the control air line (The compressed air from 361 is solenoid valve C35)
to close the piston valve (13). When the piston valve α■ closes, the indicator light 04) lights up. When the switch (33) is turned off, the solenoid valves (3) return to the positions shown in Figure 6, the compressed air supplied to the piston valve (13) is discharged, and the piston valve (1) returns to the open state. At this time, the indicator light (34) goes out.

上述した装置において、ディーゼル機関(2)が停止し
ているときには、ピストン弁(13)を閉じた状態にす
る。その直前まで燃料油は、ミキシングタンク(1)か
ら燃料供給管(9)、ブースターポンプ(Io)、燃料
ポンプ(11)、開いているピストン弁t13)。
In the above-mentioned device, when the diesel engine (2) is stopped, the piston valve (13) is kept in a closed state. Just before that, the fuel oil flows from the mixing tank (1) to the fuel supply pipe (9), the booster pump (Io), the fuel pump (11), and the open piston valve t13).

燃料灰油管(I4)、ミキシングタンク(])の経路で
循環しているが、ピストン弁(I3)を閉じることによ
つて燃料油は、ミキシングタンク(1)から燃料供給管
(9)、ブースターポンプQO)、燃料ポンプ(11)
、燃料高圧管(12を通って、第2図に示す弁棒0力の
中心孔(25)に流入する。このときには燃料供給通路
(2Bj内の燃料圧力は低いため、循環弁Q’lはスプ
リング(23)によってシリンダ斜面(24)に押し付
けられ、ノズル孔(28)は開いた状態になっている。
The fuel oil is circulated through the path of the fuel ash oil pipe (I4) and the mixing tank (]), but by closing the piston valve (I3), the fuel oil is transferred from the mixing tank (1) to the fuel supply pipe (9) and the booster. pump QO), fuel pump (11)
, the fuel passes through the high-pressure pipe (12) and flows into the center hole (25) of the valve rod with zero force shown in FIG. It is pressed against the cylinder slope (24) by the spring (23), and the nozzle hole (28) is in an open state.

そのため燃料ポンプ01+から燃料高圧管(121を通
って弁棒θつの中心孔(25)に送られて来た燃料油は
、ノズル孔(2転循環油路(27)、循環油管05、逆
止弁α6)、ミキシングタンク(+1の経路で循環し、
ディーゼル機関停止中でも燃料高圧管0zに燃料油が流
れているので、燃料高圧管02が閉塞したり燃料油が固
着したりすることはない。
Therefore, the fuel oil sent from the fuel pump 01+ to the central holes (25) of the valve stem θ through the fuel high pressure pipe (121) is sent to the nozzle holes (two-turn circulation oil path (27), circulation oil pipe 05, Valve α6), mixing tank (circulated through +1 route,
Even when the diesel engine is stopped, fuel oil is flowing through the high pressure fuel pipe 0z, so the high pressure fuel pipe 02 will not be blocked or the fuel oil will not stick.

低粘度の良質の燃料油を使用しているときにはピストン
弁(13)を開いておくと、ディーゼル機関停止時に燃
料油は、ミキシングタンク(1)、燃料供給管(9)、
ブースターポンプ00)、燃料ポンプ(II)、ピスト
ン弁Q3)、燃料灰油管(+敷ミキシングタンク(])
の経路で循環する。f 循環弁本体(8)の燃料供給通路(26)内の燃料圧力
が約30bαγ以上になると、循環弁用弁09)はスプ
リング123)の力に抗して段部t30)に押し付けら
れ、ノズル孔08+を塞ぎ、循環油管(旧への燃料油の
循環を停止する。ディーゼル機関起動時には燃料高圧管
(1りの燃料圧力は約800 barとなる。この圧力
は燃料供給通路(26)に伝えられて循環弁用弁吐は即
座に段部(30)に押し付けられ、燃料油は循環弁本体
(8)から燃料噴射弁(7)を経て燃焼室(6)へ噴射
される。テイーゼル機関(2)の運転中の燃料高圧管(
121内燃料圧力は50 bar以上であるため、循環
弁α0は段部側に押し付けられた状態に保たれ、ノズル
孔(28)は閉じている。
When using low-viscosity, high-quality fuel oil, if the piston valve (13) is opened, when the diesel engine is stopped, the fuel oil will be transferred to the mixing tank (1), fuel supply pipe (9),
Booster pump 00), fuel pump (II), piston valve Q3), fuel ash oil pipe (+ bed mixing tank (])
It circulates along the route of f When the fuel pressure in the fuel supply passage (26) of the circulation valve main body (8) exceeds approximately 30bαγ, the circulation valve valve 09) is pressed against the stepped portion t30) against the force of the spring 123), and the nozzle Block hole 08+ and stop the circulation of fuel oil to the circulation oil pipe (old).When starting the diesel engine, the fuel pressure in the fuel high pressure pipe (1) is approximately 800 bar.This pressure is transmitted to the fuel supply passage (26). The circulation valve valve discharge is immediately pressed against the stepped portion (30), and fuel oil is injected from the circulation valve body (8) through the fuel injection valve (7) into the combustion chamber (6). 2) Fuel high pressure pipe during operation (
Since the fuel pressure inside 121 is 50 bar or more, the circulation valve α0 is kept pressed against the step side, and the nozzle hole (28) is closed.

本発明は、燃料循環機能をもたないテイーゼル機関に対
し、燃料噴射弁に循環弁本体を取り付けることによって
燃料循環機能を付与し、粗悪重油の使用を可能として資
源節約を図ることができる。また循環機能をもたないデ
ィーゼル機関の燃料噴射弁等の設計変更が不要で装備が
容易であり、構造が簡単で保守点検も容易である。
The present invention provides a fuel circulation function to a tasel engine that does not have a fuel circulation function by attaching a circulation valve main body to a fuel injection valve, thereby making it possible to use poor quality heavy oil and saving resources. In addition, it is easy to install, as there is no need to change the design of fuel injection valves, etc. of diesel engines that do not have a circulation function, and the structure is simple, making maintenance and inspection easy.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の系統図、第2図は循環弁本
体の一実施例の拡大断面図、第3図はピストン弁の制御
回路の系統図である。 (1)・・・ミキシングタンク、(2)・・ディーゼル
機関、(7)・・燃料噴射弁、   (8)・・・循環
弁本体、OD・・・燃料ポンプ、   (+2・・燃料
高圧管、(19・・循環油管、    06)・・逆止
弁、α9・・・循環弁用弁。 特許出願人 石川島播磨重工業株式会社
FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an embodiment of the circulation valve main body, and FIG. 3 is a system diagram of a control circuit of a piston valve. (1)...Mixing tank, (2)...Diesel engine, (7)...Fuel injection valve, (8)...Circulation valve body, OD...Fuel pump, (+2...Fuel high pressure pipe , (19... Circulating oil pipe, 06)... Check valve, α9... Valve for circulation valve. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] ■)燃料高圧管によって燃料ポンプに接続され該燃料ポ
ンプより前記燃料高圧管を介して送られて来た燃料を燃
料噴射弁に供給する循環弁本体と、逆上弁を有し前記循
環弁本体をミキシングタンクに接続する循環油管と、前
記循環弁本体内に設けられ前記燃料噴射弁に対する燃料
供給圧力が一定値以下のとき前言己燃料高圧管と循環油
管との間を連通し前言己燃料噴射弁に対する燃料供給圧
力か一定値以上のとき前記燃料高圧管と循環油管との間
を遮断する循環弁と、を備えたことを特徴とするディー
ゼル機関の燃料循環装置。
(2) A circulation valve body connected to a fuel pump by a fuel high-pressure pipe and supplying fuel sent from the fuel pump via the fuel high-pressure pipe to the fuel injection valve, and a reversal valve, and the circulation valve main body A circulating oil pipe connected to a mixing tank, a high pressure pipe provided in the circulation valve body and a circulating oil pipe provided in the fuel injection valve when the fuel supply pressure to the fuel injection valve is below a certain value are communicated with each other to inject the fuel. 1. A fuel circulation system for a diesel engine, comprising: a circulation valve that shuts off between the high pressure fuel pipe and the circulation oil pipe when the fuel supply pressure to the valve exceeds a certain value.
JP18011782A 1982-10-14 1982-10-14 Fuel circulating device for diesel engine Granted JPS5968552A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18011782A JPS5968552A (en) 1982-10-14 1982-10-14 Fuel circulating device for diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18011782A JPS5968552A (en) 1982-10-14 1982-10-14 Fuel circulating device for diesel engine

Publications (2)

Publication Number Publication Date
JPS5968552A true JPS5968552A (en) 1984-04-18
JPH0226703B2 JPH0226703B2 (en) 1990-06-12

Family

ID=16077710

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18011782A Granted JPS5968552A (en) 1982-10-14 1982-10-14 Fuel circulating device for diesel engine

Country Status (1)

Country Link
JP (1) JPS5968552A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6114767U (en) * 1984-06-29 1986-01-28 日野自動車株式会社 Injection fuel return structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2561374Y2 (en) * 1991-03-25 1998-01-28 愛知機械工業株式会社 Valve lifter for internal combustion engine
JPH0592405U (en) * 1992-05-21 1993-12-17 フジオーゼックス株式会社 Tappet for internal combustion engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57167256U (en) * 1981-04-16 1982-10-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57167256U (en) * 1981-04-16 1982-10-21

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6114767U (en) * 1984-06-29 1986-01-28 日野自動車株式会社 Injection fuel return structure
JPH0137174Y2 (en) * 1984-06-29 1989-11-09

Also Published As

Publication number Publication date
JPH0226703B2 (en) 1990-06-12

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