JP4399697B2 - Fuel supply device and fuel filtration device - Google Patents

Fuel supply device and fuel filtration device Download PDF

Info

Publication number
JP4399697B2
JP4399697B2 JP2001054435A JP2001054435A JP4399697B2 JP 4399697 B2 JP4399697 B2 JP 4399697B2 JP 2001054435 A JP2001054435 A JP 2001054435A JP 2001054435 A JP2001054435 A JP 2001054435A JP 4399697 B2 JP4399697 B2 JP 4399697B2
Authority
JP
Japan
Prior art keywords
fuel
valve
pump
passage
feed
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
Application number
JP2001054435A
Other languages
Japanese (ja)
Other versions
JP2002256995A (en
Inventor
典也 松本
芳彦 大矢
浩 森下
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.)
Denso Corp
Original Assignee
Denso 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 Denso Corp filed Critical Denso Corp
Priority to JP2001054435A priority Critical patent/JP4399697B2/en
Priority to DE10208425.4A priority patent/DE10208425B4/en
Publication of JP2002256995A publication Critical patent/JP2002256995A/en
Application granted granted Critical
Publication of JP4399697B2 publication Critical patent/JP4399697B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0035—Thermo sensitive valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/24—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means
    • F02M37/26—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means with water detection means
    • F02M37/28—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means with water detection means with means activated by the presence of water, e.g. alarms or means for automatic drainage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/44—Filters structurally associated with pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/16—Feeding by means of driven pumps characterised by provision of personally-, e.g. manually-, operated pumps

Description

【０００１】
【発明の属する技術分野】
本発明は、ディーゼル機関の燃料噴射ポンプへディーゼル燃料を供給する経路上に設けられた燃料供給装置または燃料濾過装置に関するものである。
【０００２】
【従来の技術】
ディーゼル機関（ディーゼルエンジン）は、燃費に優れ、ＣＯ２排出量が少ないことから地球温暖化の抑制に優れる機関として注目されている。ディーゼルエンジンは、通常、燃料である軽油や重油を燃料噴射ポンプで高圧化すると共に噴射ノズルに圧送し、シリンダー内で圧縮された高温高圧の空気中へ噴霧し燃焼させて、出力を得ている。
ところで、ディーゼルエンジンに用いられる燃料噴射ポンプや噴射ノズルは非常に精密な部品から構成されるため、燃料（ディーゼル燃料）中に含まれるダスト等の固形分や水分等を燃料噴射ポンプ手前の燃料フィルターで十分に除去した後、燃料をそれらの装置に供給するようになっている。こうして、それらの装置の機械的摩耗、スティック、発錆等が防止されている。
【０００３】
ところが、ディーゼル燃料には比較的融点の高いパラフィンが含まれ、低温になると、そのパラフィンの結晶（ワックス）が析出し、燃料フィルターの目詰りを生じさせる。このようなワックスが燃料フィルター（特にエレメント）に多量に堆積して目詰りを起すと、燃料が流れずエンジン停止に至るため、ワックスの析出を防止し燃料の流動性を確保することが必要となる。
そこで、ワックスの析出を防止するために、燃料の加熱システムに関する提案が種々為されている。例えば、特公平５−７９８２３号公報では、バイメタルの制御弁を介して、燃料噴射ポンプからオーバーフローして戻ってくる加熱された燃料（リターン燃料）を、低温時に燃料フィルター手前の燃料通路（送通路）に導くようにしている。さらに、その制御弁と送通路との間には燃料の逆流を防止するための逆止弁も設けられている。
【０００４】
ここで、リターン燃料が比較的高温であるのは、燃料噴射ポンプ内の摩擦熱や圧縮熱等により燃料が加熱されるからである。ちなみに、前述の目的とは異なるが、加熱されたリターン燃料を利用して燃料の温度を調整し、燃料噴射量の高精度化を図る提案が特開昭５３−１２６４３１号公報に開示されている。
ところが、それらの公報には、燃料切れ（ガス欠）や燃料フィルターの交換時に、燃料通路に混入した大量の空気を追出し、正常な状態に燃料系統を復帰させ、ディーゼルエンジンを再始動可能とするために用いられる燃料圧送ポンプ（プライミングポンプ）については何ら記載されていない。
一方、特公平４−３１７２６号公報には、その燃料圧送ポンプと燃料フィルターと電気ヒータとを一体的に設けた燃料加熱装置が開示されている。その燃料加熱装置は、低温時、電気ヒータへ通電することで燃料を加熱し、ワックスの析出を回避して燃料フィルターの目詰りを防止している。しかし、電気ヒータを用いるため、コスト高となり、また、通電時のバッテリー等への負担も大きい。
【０００５】
【発明が解決しようとする課題】
そこで、図５に示すような、燃料供給装置を考えることもできる。これは、燃料圧送ポンプを備えることを前提に、燃料噴射ポンプからのリターン燃料を燃料圧送ポンプ手前（上流）の送通路に導き、燃料フィルターに流入する燃料の温度を上昇させて、ワックスによる燃料フィルターの目詰りを防止しようとするものである。なお、図５に示す温度作動弁は、ワックスの析出する低温時にはリターン燃料を燃料圧送ポンプ手前の送通路に導きく一方、高温時にはリターン燃料の全量を燃料タンクに戻すように切替えるものである。また、この燃料供給装置でも、燃料圧送ポンプ手前の送通路からリターン通路への燃料の流れ込みを防止する逆止弁を備える。
【０００６】
ところが、この燃料供給装置では、燃料切れ（ガス欠）や燃料フィルターのエレメント交換等で燃料通路内に空気が混入した場合、燃料の温度が低いと、いくら燃料圧送ポンプを作動させて燃料を圧送しても、空気の混入した燃料が温度作動弁と逆止弁とを通って燃料通路を循環してしまい、いつまでも燃料から空気が抜けないこととなってしまう。これは、図５に示すように、温度作動弁が低温時に開通状態となり、かつ、燃料圧送ポンプの作動によってその手前の送通路内が負圧となって、逆止弁も開通状態となるからである。
本発明は、このような事情に鑑みて為されたものである。つまり、燃料フィルターのエレメント交換や燃料切れ等で燃料通路内に空気が混入した場合でも、燃料系統の復帰を容易に図れると共にワックスによる燃料フィルターの目詰りを回避して安定した燃料供給を可能とする燃料供給装置または燃料濾過装置を提供することを目的とする。
【０００７】
【課題を解決するための手段】
そこで、本発明者はこの課題を解決すべく、燃料圧送ポンプを設け、リターン燃料を用いて燃料フィルター手前の燃料を加熱してワックスの析出を防止することを前提に、燃料圧送ポンプを作動させるときは、燃料フィルター手前に導かれるリターン燃料の通路を遮蔽することを思いつき、本発明の燃料供給装置または燃料濾過装置を開発するに至ったものである、
（１）すなわち、請求項１に記載した本発明の燃料供給装置は、燃料タンクから燃料フィルターを経て燃料噴射ポンプへディーゼル燃料を送る送通路に配設され該ディーゼル燃料を一時的に圧送することができる燃料圧送ポンプと、該燃料噴射ポンプからオーバーフローしたリターン燃料を該燃料タンクに戻すリターン通路と該燃料フィルター手前にある該送通路とを連通する連通路に配設され少なくとも該ディーゼル燃料からワックスの析出する低温時に該連通路を開通させる温度作動弁と、該燃料圧送ポンプを作動させるときに該連通路を遮蔽する遮蔽弁と、を備え、前記連通路は、前記燃料フィルターと該燃料フィルター手前に配設された前記燃料圧送ポンプとの間にある送通路に連通しており、前記遮蔽弁は、該燃料圧送ポンプが作動して該送通路内が正圧になったときに該連通路を閉塞する弁であって、前記温度作動弁と前記遮蔽弁とが前記連通路内で直列に配置されており、前記温度作動弁は前記遮蔽弁よりも前記リターン通路側に位置していることを特徴とする。
【０００８】
温度作動弁の開通する低温時には、燃料噴射ポンプにより加熱されたリターン燃料を連通路を介して燃料フィルター手前の送通路に導き、燃料の温度を上昇させてワックスによる燃料フィルターの目詰りを防止できることは前述の通りである。
ところで、本発明では、燃料圧送ポンプの作動時、リターン通路から送通路へリターン燃料を導く連通路を遮蔽弁により遮蔽することができる。このため、燃料フィルターのエレメント交換や燃料切れ等で燃料通路内に空気が混入した状態で燃料圧送ポンプを作動させても、空気の混入したリターン燃料が再び送通路に戻されることがなく、空気が燃料通路を循環することがないため、燃料系統の復帰を容易に図ることができる。
【０００９】
（２）また、請求項２に記載した本発明の燃料濾過装置は、燃料タンクから燃料フィルターを経て燃料噴射ポンプへディーゼル燃料を送る送通路に配設され該燃料噴射ポンプ手前で該ディーゼル燃料を濾過する燃料フィルターと、該送通路に配設され該ディーゼル燃料を一時的に圧送することができる燃料圧送ポンプと、該燃料噴射ポンプからオーバーフローしたリターン燃料を該燃料タンクに戻すリターン通路と該燃料フィルター手前の該送通路とを連通する連通路に配設され少なくとも該ディーゼル燃料からワックスの析出する低温時に該連通路を開通させる温度作動弁と、該燃料圧送ポンプを作動させるときに該連通路を遮蔽する遮蔽弁と、該燃料フィルターを備える有底筒状のロアーハウジングと、該燃料圧送ポンプと該温度作動弁と該遮蔽弁とを備え該ロアーハウジングの開孔部に設けられるアッパーハウジングと、からなり、前記連通路は、前記燃料フィルターと該燃料フィルター手前に配設された前記燃料圧送ポンプとの間にある送通路に連通しており、前記遮蔽弁は、該燃料圧送ポンプが作動して該送通路内が正圧になったときに該連通路を閉塞する弁であって、前記温度作動弁と前記遮蔽弁とが前記連通路内で直列に配置されており、前記温度作動弁は前記遮蔽弁よりも前記リターン通路側に位置していることを特徴とする。
【００１０】
前述の燃料供給装置では、燃料圧送ポンプと温度作動弁と遮蔽弁とが一体的に形成されてもそれぞれが別体として設けられたものでも良いし、燃料フィルターを必須構成要素ともしていない。
これに対してこの燃料濾過装置は、ロアーハウジングに燃料フィルターが設けられ、燃料圧送ポンプと温度作動弁と遮蔽弁とがアッパーハウジングに一体的に設けられたものである。このような構成とすることにより、燃料濾過装置を小型化できる。また、前記燃料フィルターが、前記ロアーハウジングに交換可能なエレメントを収納してなるものであると、ロアーハウジングとアッパーハウジングとを分解することで、エレメントの交換を容易に行える。
さらに、前記ロアーハウジングの底部に、前記ディーゼル燃料中に含まれる水を分離できるセジメンタが設けられていると、一層好適である。
【００１１】
（３）また、上記の燃料供給装置および燃料濾過装置のいずれの場合でも、次のことが言える。
つまり、前記温度作動弁が、前記低温時よりも高い高温時に前記連通路を閉塞するバイメタルバルブであると好適である。
温度作動弁をバイメタルバルブとすることにより、低コストで精度良く温度作動弁を構成することができる。また、高温時に連通路を閉塞するようにしたので、加熱されたリターン燃料は燃料タンクにほぼ全量が戻り、リターン燃料が燃料噴射ポンプを循環することがない。従って、燃料噴射ポンプは送通路を通って燃料タンクから送られてくる燃料により冷却されるため、燃料噴射ポンプの過熱も防止される。
【００１２】
また、前記連通路は、前記燃料フィルターと該燃料フィルター手前に配設された前記燃料圧送ポンプとの間にある送通路に連通しており、前記遮蔽弁は、該燃料圧送ポンプが作動して該送通路内が正圧になったときに該連通路を閉塞する弁であると、好適である（図１参照）。
燃料圧送ポンプを作動させると、それより下流側の送通路内は正圧となる。そして、その正圧時に連通路を閉塞する弁で遮蔽弁を構成すると、遮蔽弁を簡易な構造のものとすることができる。例えば、遮蔽弁が、前記送通路から前記リターン通路へ向けて軽く付勢されており該連通路に設けられた弁座に当接することで該連通路を閉塞するものとできる。なお、「軽く」付勢とは、ディーゼルエンジンの通常運転時（燃料圧送ポンプを作動させていないとき）、燃料圧送ポンプ下流の送通路に作用する負圧によって遮蔽弁が開通状態となる程度のものである。もっとも、そのような付勢力を与えることで、弁の安定的な支持が可能となる。また、燃料圧送ポンプを、電動ポンプとすることも可能であるが、燃料圧送ポンプは使用する状況が限られるため、例えば、ダイヤフラムを用いた手動式ポンプのように、より簡易な構造とすることが好ましい。
【００１３】
このような本発明に係る燃料系統のシステム構成例を図１に概念的に示す。図１は、低温時に燃料圧送ポンプを作動させている状態を示す。温度作動弁が開通状態にあるにも拘らず、遮蔽弁には燃料圧送ポンプの吐出圧（正圧）が作用しているため、遮蔽弁が連通路を閉塞している。このため、空気の混入したリターン燃料が送通路に流入することなく、燃料タンクに戻されている。なお、図１に示した燃料圧送ポンプは、ダイヤフラムを用いた手動式ポンプであり、吸入ポートと吐出ポートとの両方に逆止弁を備える。
これまでは前記温度作動弁と前記遮蔽弁とが独立した弁であることを前提に説明したが、それらの弁を一つの電磁弁で構成することも可能である。例えば、前記低温時に前記連通路を開通し前記高温時に前記連通路を閉塞し前記燃料圧送ポンプを作動させるときには該ディーゼル燃料の温度に拘らず該連通路を閉塞する電磁弁とすれば良い。
【００１４】
【発明の実施の形態】
次に、本発明に係る実施形態を挙げ、本発明をより具体的に説明する。
本発明の第１実施形態である燃料濾過装置１００を図２に示す。なお、この燃料濾過装置１００は、本発明の燃料供給装置をより具体化したものでもある。
燃料濾過装置１００は、プライミングポンプ１１０と温度切替弁１２０と燃料フィルター１３０とセジメンタ１４０とからなり、プライミングポンプ１１０と温度切替弁１２０とはアッパーハウジング１５０に納められ、燃料フィルター１３０とセジメンタ１４０とはロアーハウジング１６０に納められている。
プライミングポンプ１１０は、本発明でいう燃料圧送ポンプに相当するものであり、ダイヤフラム１１１をノブ１１２で上下方向に手動揺動させると、吸入ポート１１３から吐出ポート（図略）へディーゼル燃料が圧送されるものである。なお、それらの吸入ポート１１３と吐出ポートには、それぞれ燃料の吸入と吐出とを許容する逆止弁が設けられている。
【００１５】
温度切替弁１２０は、バイメタルバルブ１２１とチェックバルブ１２２とそれらを収納するバルブハウジング１２３とからなり、バイメタルバルブ１２１とチェックバルブ１２２とがそれぞれ本発明でいう温度作動弁と遮蔽弁とに相当する。温度切替弁１２０の拡大図を図３に示す。図３からも解るように、バルブハウジング１２３の中央にはリターン燃料をリターン通路１２５から送通路１２６に導く連通路１２４が形成されており、連通路１２４に連なる連通ポート１２７はバイメタルバルブ１２１により開閉されるようになっている。尚、この開閉位置をバイメタルバルブ１２１の下方側の保持体１２１ａとしても良い。
このバイメタルバルブ１２１は、リターン燃料（軽油）の曇り点以上で連通ポート１２７を閉塞するようになっている。軽油の曇り点は、軽油の等級により異なるため、ディーゼルエンジンの仕様地に合わせて設定する。なお、軽油の曇り点とは、軽油からワックスが析出し始める温度である。また、バイメタルバルブ１２１の開閉切替え温度を雲り点以上に設定しているのは、次の理由による。バイメタルバルブ１２１が直接感知しているのはリターン燃料の温度であり、燃料フィルター１３０に送られる燃料の温度とズレがある。作動温度に余裕を設けることで、チェックバルブ１２２のハンチング等を防止して安定動作をさせることができる。このように、バイメタルバルブ１２１の作動点に余裕を設けることで、ワックスによる燃料フィルター１３０の目詰りを安定して回避できると共に、燃料噴射ポンプの過熱も未然に防ぐことができる。
【００１６】
リターン通路１２５の流入ポートにはニップル１２５ａが圧入され燃料噴射ポンプ（図略）と耐油製のゴムホースにより接続可能となっている。また、リターン通路１２５の吐出ポートにもニップル１２５ｂが圧入され燃料タンク（図略）に耐油製のゴムホースで接続可能となっている。尚、前記記載の流れ方向は逆でも成立する。
チェックバルブ１２２は、バイメタルバルブ１２１の下流側に配設され、バイメタルバルブ１２１の保持体１２１ａを弁座として、ばね定数の小さなコイルばね１２２ａによって下流側から上流側に付勢されている。なお、コイルばね１２２ａは支持体１５０ｂにより支持され、支持体１５０ｂは外周側に切り欠きが設けてあり、連通路１２４から送通路１２６へ燃料が流入できるようになっている。なお、バルブハウジング１２３は、アッパーハウジング１５０の円筒状凹部にＯリング１２８を介在させて油密に嵌入されている。
【００１７】
燃料フィルター１３０は、略円柱状に蛇腹の濾紙で構成されたエレメント１３１を略有底円筒状のロアーハウジング１６０に収納されてなる。そして、送通路１２６から送られてくるディーゼル燃料はエレメント１３１の外周側や底面側を通って内部に流入し、濾過された燃料が上面側に設けられた流出ポート１３２から燃料噴射ポンプに送られる。このとき、温度切替弁１２０の作動により、燃料の温度は軽油の曇り点を越えているため、ワックスがエレメント１３１に堆積することはない。
【００１８】
セジメンタ１４０は、ロアーハウジング１６０の底面側に設けられ、ディーゼル燃料に含まれる水分を沈降分離するものである。セジメンタ１４０は、フロート式水面センサ１４１とドレーンコック１４２とを備え、分離した水が設定高さを超えるとフロート式水面センサ１４１がＯＮ信号を出力して、警告灯（図略）を点灯させる。そして、それを認識した運転者等は、ドレーンコック１４２を緩めることで、セジメンタ１４０内の水分を除去することができる。
【００１９】
燃料濾過装置１００内の燃料の流れを図２または図３を参照して説明する。
先ず、通常運転時、燃料は、燃料タンク→送通路１１６→プライミングポンプ１１０と流れる（流れ▲１▼→▲２▼）。次に、図２上の裏側を通って、プライミングポンプ１１０から送通路１２６に流れる（流れ▲２▼→▲３▼）。次に、燃料フィルター１３０を通って燃料噴射ポンプに流れる（流れ▲４▼→▲５▼→▲６▼）。この後、燃料噴射ポンプからリターン通路１２５通って燃料タンクへと戻る（流れ▲７▼→▲９▼）。ここで、リターン通路１２５を流れるリターン燃料の温度が比較的低いときは、バイメタルバルブ１２１が開き、さらに、送通路１２６も負圧状態であるためにチェックバルブ１２２も開いている。その結果、そのリターン燃料の一部が連通路１２４を通って送通路１２６に流入し送通路１２６内を流れる燃料の温度を上昇させ、ワックスの析出が防止される。
【００２０】
ところで、エレメント１３１の交換やガス欠等で燃料通路に空気が混入したときは、プライミングポンプ１１０の手動ボタンを上下に所定回数押す。このとき、エンジンが停止した状態、つまり、燃料噴射ポンプのフィードポンプが停止した状態であるため、送通路１２６内は正圧となる。従って、チェックバルブ１２２には連通ポート１２７を閉じる側に力が作用し、チェックバルブ１２２は連通路１２４を介したリターン燃料の流れを遮蔽する。この結果、燃料噴射ポンプを出た燃料はリターン通路１２５を通って燃料タンクに全量流れ込み、空気の混入した燃料が再度、送通路１２６に戻ることはない。よって、プライミングポンプ１１０を所定回数作動させることにより、空気の混入した燃料は燃料タンクに戻される一方、各燃料通路には空気の混入していない燃料が充されることとなる。
【００２１】
次に、本発明に係る他の実施形態である燃料供給装置について説明する。
この燃料供給装置は、上述の燃料濾過装置１００のように、プライミングポンプ１１０、燃料フィルター１３０および温度切替弁１２０を一体とせずに、それらを適当に分割したものである。その主要部となる温度切替弁２２０を図４に示す。温度切替弁２２０は、前述の温度切替弁１２０と基本的な構成および機能を同じくする。つまり、バイメタルバルブ２２１と、チェックバルブ２２２と、それらを収納するロアーバルブハウジング２６０と、バイメタルバルブ２２１をロアーバルブハウジング２６０との間で挟持しリターン通路２２５と連通路２２４とを形成するアッパーバルブハウジング２５０とからなる。ここで、バイメタルバルブ２２１とチェックバルブ２２２とがそれぞれ本発明でいう温度作動弁と遮蔽弁とに相当する。
【００２２】
リターン通路２２５の流入ポートにはニップル２５０ａが一体形成されており、燃料噴射ポンプ（図略）と耐油製のゴムホースで接続できるようになっている。また、リターン通路２２５の吐出ポートにはニップル２５０ｂが一体形成されており燃料タンク（図略）に耐油製のゴムホースで接続できるようになっている。
チェックバルブ２２２は、バイメタルバルブ２２１の下流側（燃料供給通路側）に配設され、バイメタルバルブ２２１の保持体２２１ａを弁座として、ばね定数の小さなコイルばね２２２ａによって下流側から上流側に付勢されている。なお、コイルばね２２２ａはロアーバルブハウジング２６０の支持部２６０ｂにより支持され、ロアーバルブハウジング２６０の支持部２６０ｂは外周側に切り欠きが設けてあり、連通路２２４から送通路２２６へ燃料が流入できるようになっている。燃料の流れは、図３に示した前述の燃料濾過装置１００の場合と同様であり、図３に対応させて図４にも流れの方向および符号を示した。
【００２３】
【発明の効果】
このように、本発明の燃料供給装置または燃料濾過装置によれば、燃料フィルターの交換や燃料切れ等で燃料通路に空気が混入した状態で燃料圧送ポンプを作動させる場合でも、遮蔽弁が連通路を遮蔽するため、空気の混入したリターン燃料が送通路に再度戻ることがなく、燃料が燃料系統中を循環することを防止できる。
【００２４】
また、燃料圧送ポンプを備えることにより燃料系統の復帰が容易となると共に低温時にリターン燃料を燃料フィルター手前の送通路に戻すことで、ワックスによる燃料フィルターの目詰りを防止することができる。
さらに、本発明の燃料濾過装置では、燃料フィルター等が一体的に構成されているため、装置全体をコンパクトな構成とすることができる。
【図面の簡単な説明】
【図１】本発明に係る燃料系統のシステム構成例を示す図である。
【図２】本発明の実施形態である燃料濾過装置を示す全体図である。
【図３】その実施形態に係る温度切替弁の拡大図である。
【図４】本発明の実施形態である燃料供給装置の温度切替弁を示す拡大図である。
【図５】本発明の開発途中で検討した燃料系統のシステム構成を示す図である。
【符号の説明】
１００ 燃料濾過装置
１１０ プライミングポンプ（燃料圧送ポンプ）
１２０ 温度切替弁
１２１ バイメタルバルブ（温度作動弁）
１２２ チェックバルブ（遮蔽弁）
１３０ 燃料フィルター
１４０ セジメンタ
１５０ アッパーハウジング
１６０ ロアーハウジング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel supply device or a fuel filtration device provided on a path for supplying diesel fuel to a fuel injection pump of a diesel engine.
[0002]
[Prior art]
Diesel engines (diesel engines) are attracting attention as an engine that is excellent in suppressing global warming because of its excellent fuel efficiency and low CO2 emission. Diesel engines usually obtain high output by increasing the pressure of light oil or heavy oil, which is fuel, with a fuel injection pump and pumping it to an injection nozzle and spraying it into high-temperature and high-pressure air compressed in a cylinder. .
By the way, since fuel injection pumps and injection nozzles used in diesel engines are composed of very precise parts, solid fuel such as dust contained in the fuel (diesel fuel), moisture, etc. are removed from the fuel filter in front of the fuel injection pump. The fuel is supplied to these devices after it is sufficiently removed. Thus, mechanical wear, sticking, rusting and the like of these devices are prevented.
[0003]
However, the diesel fuel contains paraffin having a relatively high melting point, and when the temperature becomes low, the paraffin crystal (wax) precipitates, causing clogging of the fuel filter. If such wax accumulates in a large amount on the fuel filter (especially the element) and causes clogging, the fuel will not flow and the engine will stop, so it is necessary to prevent the wax from precipitating and ensure the fluidity of the fuel. Become.
Therefore, various proposals regarding a fuel heating system have been made to prevent the precipitation of wax. For example, in Japanese Patent Publication No. 5-79823, heated fuel (return fuel) that overflows and returns from a fuel injection pump via a bimetal control valve is returned to a fuel passage (feed passage) in front of the fuel filter at low temperatures. ). Further, a check valve for preventing a back flow of fuel is provided between the control valve and the feed passage.
[0004]
Here, the reason why the return fuel is relatively high is that the fuel is heated by frictional heat or compression heat in the fuel injection pump. Incidentally, although different from the above-mentioned purpose, Japanese Patent Laid-Open No. Sho 53-126431 discloses a proposal for adjusting the temperature of the fuel by using the heated return fuel to improve the fuel injection amount. .
However, in these publications, when the fuel runs out (out of gas) or the fuel filter is replaced, a large amount of air mixed in the fuel passage is expelled, the fuel system is returned to a normal state, and the diesel engine can be restarted. There is no description of a fuel pump (priming pump) used for the purpose.
On the other hand, Japanese Patent Publication No. 4-31726 discloses a fuel heating apparatus in which a fuel pump, a fuel filter, and an electric heater are integrally provided. The fuel heating device heats the fuel by energizing an electric heater at a low temperature, avoids precipitation of wax, and prevents clogging of the fuel filter. However, since an electric heater is used, the cost is high, and the burden on the battery or the like when energized is large.
[0005]
[Problems to be solved by the invention]
Therefore, a fuel supply apparatus as shown in FIG. 5 can be considered. This is based on the premise that a fuel pump is provided, and the return fuel from the fuel injection pump is led to the feed passage before (upstream) the fuel pump, and the temperature of the fuel flowing into the fuel filter is raised, so that the fuel by the wax It is intended to prevent clogging of the filter. The temperature actuated valve shown in FIG. 5 switches the return fuel to the feed passage before the fuel pump at a low temperature where the wax is deposited, and switches the entire amount of return fuel back to the fuel tank at a high temperature. This fuel supply device also includes a check valve that prevents fuel from flowing from the feed passage before the fuel pump to the return passage.
[0006]
However, in this fuel supply device, when air is mixed into the fuel passage due to fuel shortage (gas shortage) or replacement of the fuel filter element, the fuel pressure pump is operated to pump the fuel to a certain extent when the fuel temperature is low. Even so, the fuel mixed with air passes through the temperature operation valve and the check valve and circulates in the fuel passage, and the air does not escape from the fuel indefinitely. This is because, as shown in FIG. 5, the temperature operation valve is opened when the temperature is low, and the operation of the fuel pressure pump causes negative pressure in the front passage, and the check valve is also opened. It is.
The present invention has been made in view of such circumstances. In other words, even if air is mixed in the fuel passage due to element replacement of the fuel filter or running out of fuel, the fuel system can be easily restored and stable fuel supply can be achieved by avoiding clogging of the fuel filter due to wax. An object of the present invention is to provide a fuel supply device or a fuel filtration device.
[0007]
[Means for Solving the Problems]
In order to solve this problem, the present inventor operates a fuel pressure pump on the premise that a fuel pressure pump is provided and the fuel in front of the fuel filter is heated using return fuel to prevent wax precipitation. At times, the idea came to shield the return fuel passage led to the front of the fuel filter, which led to the development of the fuel supply device or fuel filtration device of the present invention.
(1) That is, the fuel supply device of the present invention described in claim 1 is disposed in a feed passage for sending diesel fuel from a fuel tank to a fuel injection pump through a fuel filter, and temporarily pumps the diesel fuel. A fuel pressure feed pump capable of generating fuel, a return passage for returning the return fuel overflowed from the fuel injection pump to the fuel tank, and a communication passage communicating with the feed passage in front of the fuel filter. A temperature operating valve for opening the communication passage at a low temperature when the fuel is deposited, and a shielding valve for shielding the communication passage when the fuel pump is operated. The communication passage includes the fuel filter and the fuel filter. The fuel pressure feed pump communicates with a feed passage between the fuel pressure feed pump and the fuel pressure feed pump. And a valve which closes the communication passage when said transmission passage becomes positive pressure, and the temperature actuated valve and the shutoff valve are arranged in series in the communication path, the temperature activated The valve is located closer to the return passage than the shielding valve .
[0008]
When the temperature operation valve is open, the return fuel heated by the fuel injection pump can be guided to the feed passage in front of the fuel filter via the communication passage, and the temperature of the fuel can be raised to prevent clogging of the fuel filter by wax. Is as described above.
By the way, in the present invention, when the fuel pressure pump is operated, the communication path for guiding the return fuel from the return path to the feed path can be shielded by the shielding valve. For this reason, even if the fuel pressure pump is operated in a state where air is mixed in the fuel passage due to element replacement of the fuel filter or running out of fuel, the return fuel mixed with air is not returned to the transmission passage again. However, since the fuel passage does not circulate, the fuel system can be easily restored.
[0009]
(2) Further, the fuel filtration device of the present invention described in claim 2 is disposed in a feed passage for sending diesel fuel from a fuel tank to a fuel injection pump through a fuel filter and supplies the diesel fuel before the fuel injection pump. A fuel filter for filtering, a fuel pump that is disposed in the feed passage and is capable of temporarily pumping the diesel fuel, a return passage that returns the return fuel that has overflowed from the fuel injection pump to the fuel tank, and the fuel A temperature-operated valve disposed in a communication passage communicating with the feed passage before the filter and opening the communication passage at a low temperature when wax deposits from the diesel fuel; and the communication passage when the fuel pump is operated A shielding valve that shields the fuel, a bottomed cylindrical lower housing including the fuel filter, the fuel pressure pump, and the temperature operation valve And an upper housing provided in an opening portion of the lower housing, the communication path being between the fuel filter and the fuel pressure pump disposed in front of the fuel filter. The shielding valve is a valve that closes the communication passage when the fuel pressure pump is operated and the inside of the feed passage becomes positive pressure, and the temperature actuated valve and the temperature control valve A shielding valve is arranged in series in the communication path, and the temperature operation valve is located closer to the return path than the shielding valve .
[0010]
In the above-described fuel supply device, the fuel pump, the temperature operation valve, and the shielding valve may be integrally formed, or may be provided separately, and the fuel filter is not an essential component.
On the other hand, in this fuel filtering device, a fuel filter is provided in the lower housing, and a fuel pressure pump, a temperature operation valve, and a shielding valve are integrally provided in the upper housing. By setting it as such a structure, a fuel filtration apparatus can be reduced in size. Further, when the fuel filter is configured such that the replaceable element is accommodated in the lower housing, the element can be easily replaced by disassembling the lower housing and the upper housing.
Further, it is more preferable that a bottom of the lower housing is provided with a cementer capable of separating water contained in the diesel fuel.
[0011]
(3) Moreover, the following can be said in any of the above fuel supply device and fuel filtration device.
That is, it is preferable that the temperature operation valve is a bimetal valve that closes the communication path at a higher temperature than at the low temperature.
By using a bimetal valve as the temperature operation valve, the temperature operation valve can be configured with low cost and high accuracy. Further, since the communication path is closed at a high temperature, almost all of the heated return fuel returns to the fuel tank, and the return fuel does not circulate through the fuel injection pump. Therefore, since the fuel injection pump is cooled by the fuel sent from the fuel tank through the feed passage, overheating of the fuel injection pump is also prevented.
[0012]
Further, the communication path communicates with a feed path between the fuel filter and the fuel pressure feed pump disposed in front of the fuel filter, and the shielding valve operates when the fuel pressure feed pump is operated. A valve that closes the communication passage when the pressure in the feed passage becomes positive is preferable (see FIG. 1).
When the fuel pressure pump is operated, the pressure in the feed passage on the downstream side is positive. And if a shielding valve is comprised with the valve which obstruct | occludes a communicating path at the time of the positive pressure, a shielding valve can be made into a simple structure. For example, the shielding valve is lightly urged from the feeding passage toward the return passage, and the communication passage can be closed by contacting a valve seat provided in the communication passage. Note that “lightly” energization means that when the diesel engine is in normal operation (when the fuel pump is not activated), the shielding valve is opened by the negative pressure acting on the feed passage downstream of the fuel pump. Is. However, providing such an urging force makes it possible to support the valve stably. Also, the fuel pump can be an electric pump, but since the situation where the fuel pump is used is limited, for example, a simple structure such as a manual pump using a diaphragm is adopted. Is preferred.
[0013]
A system configuration example of such a fuel system according to the present invention is conceptually shown in FIG. FIG. 1 shows a state in which the fuel pump is operated at a low temperature. Even though the temperature operation valve is in the open state, the discharge pressure (positive pressure) of the fuel pump is acting on the shielding valve, so that the shielding valve closes the communication path. For this reason, the return fuel mixed with air is returned to the fuel tank without flowing into the feed passage. The fuel pump shown in FIG. 1 is a manual pump using a diaphragm, and includes check valves at both the suction port and the discharge port.
So far, the temperature-operated valve and the shielding valve have been described on the premise that they are independent valves. However, it is also possible to configure these valves with a single electromagnetic valve. For example, when the fuel pressure feed pump is operated by opening the communication path at the low temperature and closing the communication path at the high temperature, the solenoid valve may be used to close the communication path regardless of the temperature of the diesel fuel.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in more detail with reference to embodiments according to the present invention.
A fuel filtration device 100 according to the first embodiment of the present invention is shown in FIG. The fuel filtering device 100 is a more specific example of the fuel supply device of the present invention.
The fuel filtering device 100 includes a priming pump 110, a temperature switching valve 120, a fuel filter 130, and a segmenter 140. The priming pump 110 and the temperature switching valve 120 are housed in an upper housing 150. It is housed in the lower housing 160.
The priming pump 110 corresponds to the fuel pump in the present invention, and when the diaphragm 111 is manually swung up and down with the knob 112, diesel fuel is pumped from the suction port 113 to the discharge port (not shown). Is. The intake port 113 and the discharge port are provided with check valves that allow the intake and discharge of fuel, respectively.
[0015]
The temperature switching valve 120 includes a bimetal valve 121, a check valve 122, and a valve housing 123 that houses them, and the bimetal valve 121 and the check valve 122 correspond to the temperature operation valve and the shielding valve in the present invention, respectively. An enlarged view of the temperature switching valve 120 is shown in FIG. As can be seen from FIG. 3, a communication passage 124 is formed in the center of the valve housing 123 to guide return fuel from the return passage 125 to the feed passage 126. The communication port 127 connected to the communication passage 124 is opened and closed by the bimetal valve 121. It has come to be. Note that this open / close position may be the holding body 121 a below the bimetal valve 121.
This bimetal valve 121 closes the communication port 127 at a cloud point or higher of the return fuel (light oil). Since the cloud point of diesel oil varies depending on the grade of diesel oil, it is set according to the specifications of the diesel engine. The cloud point of light oil is the temperature at which wax begins to precipitate from light oil. The reason why the switching temperature of the bimetal valve 121 is set to a cloud point or higher is as follows. The bimetal valve 121 directly senses the temperature of the return fuel, and there is a deviation from the temperature of the fuel sent to the fuel filter 130. By providing a margin for the operating temperature, it is possible to prevent hunting of the check valve 122 and perform stable operation. Thus, by providing a margin at the operating point of the bimetal valve 121, clogging of the fuel filter 130 due to wax can be stably avoided, and overheating of the fuel injection pump can be prevented beforehand.
[0016]
A nipple 125a is press-fitted into the inflow port of the return passage 125 and can be connected to a fuel injection pump (not shown) by an oil-resistant rubber hose. A nipple 125b is also press-fitted into the discharge port of the return passage 125, and can be connected to a fuel tank (not shown) with an oil-resistant rubber hose. It should be noted that the above-described flow directions can be reversed.
The check valve 122 is disposed on the downstream side of the bimetal valve 121, and is biased from the downstream side to the upstream side by a coil spring 122a having a small spring constant with the holding body 121a of the bimetal valve 121 as a valve seat. The coil spring 122a is supported by a support 150b, and the support 150b is provided with a notch on the outer peripheral side so that fuel can flow from the communication path 124 into the feed path 126. The valve housing 123 is oil-tightly fitted into the cylindrical recess of the upper housing 150 with an O-ring 128 interposed.
[0017]
The fuel filter 130 includes an element 131 formed of a substantially cylindrical bellows filter paper and housed in a substantially bottomed cylindrical lower housing 160. The diesel fuel sent from the feed passage 126 flows into the inside through the outer peripheral side and the bottom side of the element 131, and the filtered fuel is sent to the fuel injection pump from the outflow port 132 provided on the top side. . At this time, since the temperature of the fuel exceeds the cloud point of the light oil by the operation of the temperature switching valve 120, wax does not accumulate on the element 131.
[0018]
The cementer 140 is provided on the bottom side of the lower housing 160 and separates and separates moisture contained in the diesel fuel. The cementer 140 includes a float-type water surface sensor 141 and a drain cock 142. When the separated water exceeds a set height, the float-type water surface sensor 141 outputs an ON signal to light a warning light (not shown). And the driver | operator who recognized it can remove the water | moisture content in the cementer 140 by loosening the drain cock 142. FIG.
[0019]
The flow of fuel in the fuel filtering device 100 will be described with reference to FIG. 2 or FIG.
First, during normal operation, fuel flows in the order of fuel tank → feed passage 116 → priming pump 110 (flow (1) → (2)). Next, it flows from the priming pump 110 to the feed passage 126 through the back side in FIG. 2 (flow (2) → (3)). Next, the fuel flows through the fuel filter 130 to the fuel injection pump (flow (4) → (5) → (6)). Thereafter, the fuel injection pump returns to the fuel tank through the return passage 125 (flow (7) → (9)). Here, when the temperature of the return fuel flowing through the return passage 125 is relatively low, the bimetal valve 121 is opened, and the check valve 122 is also opened because the feed passage 126 is in a negative pressure state. As a result, a part of the return fuel flows into the feed passage 126 through the communication passage 124 and raises the temperature of the fuel flowing through the feed passage 126, thereby preventing the precipitation of wax.
[0020]
By the way, when air is mixed into the fuel passage due to replacement of the element 131 or out of gas, the manual button of the priming pump 110 is pushed up and down a predetermined number of times. At this time, since the engine is stopped, that is, the feed pump of the fuel injection pump is stopped, the pressure in the feed passage 126 becomes positive. Therefore, a force acts on the check valve 122 on the side where the communication port 127 is closed, and the check valve 122 blocks the flow of return fuel through the communication path 124. As a result, all of the fuel that has exited the fuel injection pump flows into the fuel tank through the return passage 125, and the fuel mixed with air does not return to the feed passage 126 again. Therefore, by operating the priming pump 110 a predetermined number of times, the fuel mixed with air is returned to the fuel tank, while the fuel passages are filled with fuel not mixed with air.
[0021]
Next, a fuel supply apparatus according to another embodiment of the present invention will be described.
This fuel supply apparatus is one in which the priming pump 110, the fuel filter 130, and the temperature switching valve 120 are appropriately divided without being integrated as in the fuel filtration apparatus 100 described above. FIG. 4 shows the temperature switching valve 220 as the main part. The temperature switching valve 220 has the same basic configuration and function as the temperature switching valve 120 described above. That is, the bimetal valve 221, the check valve 222, the lower valve housing 260 that houses them, and the upper valve housing that sandwiches the bimetal valve 221 between the lower valve housing 260 and forms the return passage 225 and the communication passage 224. 250. Here, the bimetal valve 221 and the check valve 222 respectively correspond to a temperature operation valve and a shielding valve in the present invention.
[0022]
A nipple 250a is integrally formed at the inflow port of the return passage 225, and can be connected to a fuel injection pump (not shown) by an oil-resistant rubber hose. A nipple 250b is integrally formed at the discharge port of the return passage 225 so that it can be connected to a fuel tank (not shown) with an oil-resistant rubber hose.
The check valve 222 is disposed on the downstream side (fuel supply passage side) of the bimetal valve 221, and is biased from the downstream side to the upstream side by a coil spring 222a having a small spring constant with the holding body 221a of the bimetal valve 221 as a valve seat. Has been. The coil spring 222a is supported by a support portion 260b of the lower valve housing 260, and the support portion 260b of the lower valve housing 260 is provided with a notch on the outer peripheral side so that fuel can flow from the communication passage 224 into the feed passage 226. It has become. The flow of the fuel is the same as that of the above-described fuel filtering device 100 shown in FIG. 3, and the flow direction and the sign are also shown in FIG. 4 corresponding to FIG.
[0023]
【The invention's effect】
Thus, according to the fuel supply device or the fuel filtration device of the present invention, even when the fuel pump is operated in a state where air is mixed in the fuel passage due to replacement of the fuel filter, fuel shortage, etc., the shielding valve is connected to the communication passage. As a result, the return fuel mixed with air does not return to the feed passage again, and the fuel can be prevented from circulating in the fuel system.
[0024]
In addition, the fuel pump can be easily restored by providing the fuel pump, and the fuel filter can be prevented from being clogged by wax by returning the return fuel to the feed passage in front of the fuel filter at a low temperature.
Furthermore, in the fuel filtration device of the present invention, since the fuel filter and the like are integrally formed, the entire device can be made compact.
[Brief description of the drawings]
FIG. 1 is a diagram showing a system configuration example of a fuel system according to the present invention.
FIG. 2 is an overall view showing a fuel filtering device according to an embodiment of the present invention.
FIG. 3 is an enlarged view of a temperature switching valve according to the embodiment.
FIG. 4 is an enlarged view showing a temperature switching valve of the fuel supply apparatus according to the embodiment of the present invention.
FIG. 5 is a diagram showing a system configuration of a fuel system examined during the development of the present invention.
[Explanation of symbols]
100 Fuel Filter 110 Priming Pump (Fuel Pump)
120 Temperature switching valve 121 Bimetal valve (Temperature operated valve)
122 Check valve
130 Fuel Filter 140 Sedimentor 150 Upper Housing 160 Lower Housing

Claims (2)

燃料タンクから燃料フィルターを経て燃料噴射ポンプへディーゼル燃料を送る送通路に配設され該ディーゼル燃料を一時的に圧送することができる燃料圧送ポンプと、
該燃料噴射ポンプからオーバーフローしたリターン燃料を該燃料タンクに戻すリターン通路と該燃料フィルター手前にある該送通路とを連通する連通路に配設され少なくとも該ディーゼル燃料からワックスの析出する低温時に該連通路を開通させる温度作動弁と、
該燃料圧送ポンプを作動させるときに該連通路を遮蔽する遮蔽弁と、
を備え、
前記連通路は、前記燃料フィルターと該燃料フィルター手前に配設された前記燃料圧送ポンプとの間にある送通路に連通しており、
前記遮蔽弁は、該燃料圧送ポンプが作動して該送通路内が正圧になったときに該連通路を閉塞する弁であって、
前記温度作動弁と前記遮蔽弁とが前記連通路内で直列に配置されており、前記温度作動弁は前記遮蔽弁よりも前記リターン通路側に位置していることを特徴とする燃料供給装置。A fuel feed pump disposed in a feed passage for sending diesel fuel from a fuel tank to a fuel injection pump through a fuel filter and capable of temporarily pumping the diesel fuel;
It is disposed in a communication path that connects a return path that returns the return fuel that has overflowed from the fuel injection pump to the fuel tank and the feed path that is in front of the fuel filter, and is connected at least at a low temperature when wax deposits from the diesel fuel. A temperature actuated valve for opening the passage;
A shielding valve that shields the communication path when the fuel pump is operated;
With
The communication path communicates with a feed path between the fuel filter and the fuel pressure feed pump disposed in front of the fuel filter,
The shielding valve is a valve that closes the communication path when the fuel pressure pump is activated and the pressure in the transmission path becomes positive.
The fuel supply device, wherein the temperature operation valve and the shielding valve are arranged in series in the communication passage, and the temperature operation valve is located closer to the return passage than the shielding valve . 燃料タンクから燃料フィルターを経て燃料噴射ポンプへディーゼル燃料を送る送通路に配設され該燃料噴射ポンプ手前で該ディーゼル燃料を濾過する燃料フィルターと、
該送通路に配設され該ディーゼル燃料を一時的に圧送することができる燃料圧送ポンプと、
該燃料噴射ポンプからオーバーフローしたリターン燃料を該燃料タンクに戻すリターン通路と該燃料フィルター手前の該送通路とを連通する連通路に配設され少なくとも該ディーゼル燃料からワックスの析出する低温時に該連通路を開通させる温度作動弁と、
該燃料圧送ポンプを作動させるときに該連通路を遮蔽する遮蔽弁と、
該燃料フィルターを備える有底筒状のロアーハウジングと、
該燃料圧送ポンプと該温度作動弁と該遮蔽弁とを備え該ロアーハウジングの開孔部に設けられるアッパーハウジングと、
からなり、
前記連通路は、前記燃料フィルターと該燃料フィルター手前に配設された前記燃料圧送ポンプとの間にある送通路に連通しており、
前記遮蔽弁は、該燃料圧送ポンプが作動して該送通路内が正圧になったときに該連通路を閉塞する弁であって、
前記温度作動弁と前記遮蔽弁とが前記連通路内で直列に配置されており、前記温度作動弁は前記遮蔽弁よりも前記リターン通路側に位置していることを特徴とする燃料濾過装置。A fuel filter that is disposed in a feed passage for sending diesel fuel from a fuel tank through a fuel filter to a fuel injection pump and filters the diesel fuel before the fuel injection pump;
A fuel feed pump disposed in the feed passage and capable of temporarily pumping the diesel fuel;
The communication passage is disposed in a communication passage that connects a return passage that returns the return fuel that has overflowed from the fuel injection pump to the fuel tank and the feed passage before the fuel filter, and at least at a low temperature when wax is deposited from the diesel fuel. A temperature-actuated valve for opening
A shielding valve that shields the communication path when the fuel pump is operated;
A bottomed cylindrical lower housing comprising the fuel filter;
An upper housing provided with an opening of the lower housing, comprising the fuel pump, the temperature operating valve, and the shielding valve;
Consists of
The communication path communicates with a feed path between the fuel filter and the fuel pressure feed pump disposed in front of the fuel filter,
The shielding valve is a valve that closes the communication path when the fuel pressure pump is activated and the pressure in the transmission path becomes positive.
The fuel filtering device, wherein the temperature operating valve and the shielding valve are arranged in series in the communication path, and the temperature operating valve is located closer to the return path than the shielding valve .
JP2001054435A 2001-02-28 2001-02-28 Fuel supply device and fuel filtration device Expired - Fee Related JP4399697B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2001054435A JP4399697B2 (en) 2001-02-28 2001-02-28 Fuel supply device and fuel filtration device
DE10208425.4A DE10208425B4 (en) 2001-02-28 2002-02-27 Fuel supply device and fuel filter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001054435A JP4399697B2 (en) 2001-02-28 2001-02-28 Fuel supply device and fuel filtration device

Publications (2)

Publication Number Publication Date
JP2002256995A JP2002256995A (en) 2002-09-11
JP4399697B2 true JP4399697B2 (en) 2010-01-20

Family

ID=18914769

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001054435A Expired - Fee Related JP4399697B2 (en) 2001-02-28 2001-02-28 Fuel supply device and fuel filtration device

Country Status (2)

Country Link
JP (1) JP4399697B2 (en)
DE (1) DE10208425B4 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220412298A1 (en) * 2021-06-23 2022-12-29 Ford Global Technologies, Llc Fuel system diaphragm valve

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006017040A (en) 2004-07-02 2006-01-19 Toyota Motor Corp Diesel fuel filter and fuel passage including the diesel fuel filter
JP4347271B2 (en) 2005-07-06 2009-10-21 京三電機株式会社 Return recirculation valve
GB2436854B (en) * 2006-04-03 2010-12-22 Parker Hannifin Corp Apparatus for controlling the temperature of fuel supplied to an engine
JP4535455B2 (en) * 2006-04-12 2010-09-01 ヤンマー株式会社 Engine fuel supply structure
KR100772060B1 (en) * 2006-06-28 2007-11-01 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 The fuel supplying system for construction or forestry equipment
JP4737000B2 (en) * 2006-08-03 2011-07-27 日産自動車株式会社 Three-way valve for fuel supply device
DE102009048211A1 (en) 2009-10-05 2011-04-14 Mann+Hummel Gmbh Hand pump for pumping liquids and filter system for liquids with a hand pump
JP5604320B2 (en) * 2010-09-06 2014-10-08 株式会社クボタ Engine fuel supply system
US9776507B2 (en) 2010-12-14 2017-10-03 GM Global Technology Operations LLC Temperature based fuel management in a vehicle fuel system
JP5793321B2 (en) * 2011-03-25 2015-10-14 本田技研工業株式会社 Starting control device for motorcycle
KR101770731B1 (en) * 2011-07-13 2017-09-05 볼보 컨스트럭션 이큅먼트 에이비 Fuel system for an excavator
DE102012018504B4 (en) 2012-09-18 2023-03-09 Volkswagen Aktiengesellschaft Fuel delivery module and fuel tank and method for preparing and delivering fuel for an internal combustion engine
JP6167916B2 (en) 2013-03-01 2017-07-26 京三電機株式会社 Filter element assembly and fuel filter device
JP5888276B2 (en) * 2013-03-29 2016-03-16 株式会社デンソー Fuel supply device
SE540983C2 (en) 2016-03-07 2019-02-19 Scania Cv Ab Fuel system for an internal combustion engine and a method to increase the vaporization temperature of a fuel used in a fuel system
CN109026466B (en) * 2018-08-01 2023-08-15 一汽解放汽车有限公司 Positive pressure oil supply system for cold region of diesel vehicle and oil supply method thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1064290B (en) * 1957-02-05 1959-08-27 Daimler Benz Ag Fuel delivery system for internal combustion engines, especially in motor vehicles
DE2715587C2 (en) * 1977-04-07 1986-07-03 Robert Bosch Gmbh, 7000 Stuttgart Fuel supply device for internal combustion engines
DE3345391C2 (en) * 1983-12-15 1994-05-26 Bosch Gmbh Robert Device for temperature-dependent switching of the overflow quantity of a diesel injection pump
JPS60164657A (en) * 1984-02-04 1985-08-27 Nissan Motor Co Ltd Fuel filter device for diesel engine
JPS62277115A (en) * 1986-02-25 1987-12-02 Nippon Denso Co Ltd Heating system for fuel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220412298A1 (en) * 2021-06-23 2022-12-29 Ford Global Technologies, Llc Fuel system diaphragm valve
US11754028B2 (en) * 2021-06-23 2023-09-12 Ford Global Technologies, Llc Fuel system diaphragm valve

Also Published As

Publication number Publication date
DE10208425A1 (en) 2002-10-10
JP2002256995A (en) 2002-09-11
DE10208425B4 (en) 2020-03-26

Similar Documents

Publication Publication Date Title
JP4399697B2 (en) Fuel supply device and fuel filtration device
NL1016239C2 (en) Fuel delivery device.
US5887573A (en) Fuel filter with cold start circuit
US5887572A (en) Pressure and temperature control for fuel delivery systems
JP4138444B2 (en) Fuel injection device used for internal combustion engine
EP1058000A2 (en) Fuel transfer and conditioning unit
JPH02256869A (en) Automatic air bleeder for fuel system of diesel engine
EP0590821B1 (en) Internal combustion engine fuel supply system
JP3124818B2 (en) Lubricating oil supply device for vehicle engine
JPH05288028A (en) Lubricating oil supply device of engine for vehicle
JP2002519569A (en) Fuel supply system for internal combustion engines
CN1300902A (en) Fuel supplier for IC engine of vehicle
JP4584942B2 (en) Fuel conditioning and filtration equipment for high pressure pumps
JPWO2006104050A1 (en) FUEL SUPPLY TANK, FUEL SUPPLY SYSTEM, AND FUEL INJECTION DEVICE USED FOR THE SYSTEM
US8066030B2 (en) Fuel conveying device
JP4155900B2 (en) Fuel filter
JP4242177B2 (en) Fuel filter clog prevention device
JP2002061548A (en) Solenoid valve used for common rail type fuel injection device and relief in common
JPS59138765A (en) Percolation preventing device in carburettor
CN112771252A (en) Oil supply device for internal combustion engine
CN216665703U (en) Engine oil heat management device integrated with cooling water channel
JPS62186054A (en) Fuel filter for diesel engine
JPH045730Y2 (en)
JPH02305357A (en) Fuel system circulation device of diesel engine
CN114439571A (en) Engine oil heat management device integrated with cooling water channel

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070607

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20081226

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090108

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090226

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090514

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090709

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20091001

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20091014

R151 Written notification of patent or utility model registration

Ref document number: 4399697

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121106

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131106

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees