JP2009106878A - Fuel filter - Google Patents

Fuel filter Download PDF

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Publication number
JP2009106878A
JP2009106878A JP2007282742A JP2007282742A JP2009106878A JP 2009106878 A JP2009106878 A JP 2009106878A JP 2007282742 A JP2007282742 A JP 2007282742A JP 2007282742 A JP2007282742 A JP 2007282742A JP 2009106878 A JP2009106878 A JP 2009106878A
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Japan
Prior art keywords
filter
fuel
sheet
medium
filter element
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Pending
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JP2007282742A
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Japanese (ja)
Inventor
Hayashi Nonoyama
林 野々山
Yoshihiko Oya
芳彦 大矢
Osamu Takamizawa
修 高見澤
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Kyosan Denki Co Ltd
Denso Corp
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Kyosan Denki Co Ltd
Denso Corp
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Priority to JP2007282742A priority Critical patent/JP2009106878A/en
Priority to DE102008043334A priority patent/DE102008043334A1/en
Publication of JP2009106878A publication Critical patent/JP2009106878A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/003—Filters in combination with devices for the removal of liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B01D29/216—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets with wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • 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
    • F02M37/34—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 by the filter structure, e.g. honeycomb, mesh or fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0681—The layers being joined by gluing

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel filter capable of enhancing the bonding strength of two pieces of filtering materials and suppressing an increase in the area of a bonding part by figuring out the bonding way for the two kinds of filtering materials. <P>SOLUTION: A filter sheet 33 is formed in such a way that a filtering paper 31 formed into a non-woven sheet by blending and spinning a polyester fiber 31b and a pulp fiber 31a, and a water-repellant sheet 32 obtained by forming a PBT fiber 32a having a water-repellant property into a non-woven sheet are stacked, and that the filtering paper 31 and the water-repellant sheet 32 are bonded by welding the polyester fiber 31b and the PBT fiber 32a by an ultrasonic welding method. According to this constitution, since both of the chemical fibers are unified by melting, the bonding strength can be enhanced, and since the third member such as a hot melt sheet is not used for bonding both filtering materials, increase in an area of a portion related to bonding is suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、濾材を積層してなる燃料フィルタに関するものである。   The present invention relates to a fuel filter formed by laminating filter media.

従来のこの種の燃料フィルタとしては、たとえば、熱可塑性樹脂製不織布からなる上流側濾材層と濾紙からなる下流側濾材層とを積層してフィルタ用濾材を形成している。上流側濾材層と下流側濾材層抵抗素子との接合は、エンボス加工あるいはラミネート加工が用いられている。エンボス加工では、両濾材層を加熱された小さな複数の突起で上下から挟み、上流側濾材層である熱可塑性樹脂製不織布を部分的に溶融させて下流側濾材層である濾紙に接着する。またラミネート加工では、両濾材層の間にホットメルトシートを挟み、熱を加えて加圧することで、ホットメルトシートを介して両濾材層を接着する。（特許文献１参照）。
特開２００６−１５９１５６号公報 As this type of conventional fuel filter, for example, an upstream filter medium layer made of a thermoplastic resin nonwoven fabric and a downstream filter medium layer made of filter paper are laminated to form a filter medium. Embossing or laminating is used for joining the upstream filter medium layer and the downstream filter medium layer resistance element. In embossing, both filter media layers are sandwiched from above and below by a plurality of heated small protrusions, and a thermoplastic resin non-woven fabric that is an upstream filter media layer is partially melted and adhered to a filter paper that is a downstream filter media layer. In the laminating process, a hot melt sheet is sandwiched between the two filter medium layers, and heat is applied to pressurize the two filter medium layers through the hot melt sheet. (See Patent Document 1).
JP 2006-159156 A

上述した従来のフィルタ用濾材において、エンボス加工で作った場合、熱可塑性樹脂製不織布と濾紙との接合強度が低いため、エンボス加工で接合されたフィルタ用濾材をさらに複雑な形状に形成することが困難である。また、ラミネート加工で作った場合、両濾材層においてホットメルトシートが介在している部分は濾材としての機能が果たせないため、必要な濾過面積を得るためにはより大きいフィルタ用濾材が必要になる。   In the above-mentioned conventional filter media, when made by embossing, the bonding strength between the nonwoven fabric made of thermoplastic resin and the filter paper is low, so the filter media joined by embossing can be formed into a more complicated shape. Have difficulty. In addition, when made by laminating, the part where the hot melt sheet is interposed in both filter media layers cannot function as the filter media, so a larger filter media is required to obtain the required filtration area. .

本発明はこのような問題に鑑みてなされたもので、その目的は、２枚の濾材を積層して形成されたフィルタ濾材の構成に工夫を凝らして２枚の濾材の接合強度を高め且つ接合部の面積増大を抑制することが可能な燃料フィルタを提供することである。   The present invention has been made in view of such problems, and the object thereof is to improve the bonding strength of the two filter media by combining the filter filter media formed by laminating the two filter media, and increasing the bonding strength of the two filter media. It is providing the fuel filter which can suppress the area increase of a part.

本発明は、上記目的を達成する為に以下の技術的手段を採用する。   The present invention employs the following technical means to achieve the above object.

本発明の請求項１に記載の燃料フィルタは、第１化学繊維およびパルプ繊維を不織布シート状に混繊してなる第１濾材と撥水性を有する第２化学繊維を不織布シート状に形成してなる第２濾材とを積層して形成されたフィルタ部材から成るフィルタエレメントを備えた燃料フィルタであって、フィルタ部材は、第１化学繊維と第２化学繊維とが溶着することにより接合していることを特徴としている。   The fuel filter according to claim 1 of the present invention is formed by forming a first filter medium obtained by mixing first chemical fibers and pulp fibers into a nonwoven fabric sheet and a second chemical fiber having water repellency in a nonwoven fabric sheet. A fuel filter including a filter element composed of a filter member formed by laminating a second filter medium, wherein the filter member is joined by welding the first chemical fiber and the second chemical fiber. It is characterized by that.

上述の構成においては、積層された第１濾材と第２濾材との接合は、両者に含まれる化学繊維同士が重なり合った部分で溶着することにより行われている。すなわち、両部材の接合部において両部材が直接溶着しているので、第１濾材と第２濾材との接合強度を高めることができる。また、上述の構成においては、第１濾材と第２濾材との接合に接着剤等の第３の部材を用いていない。このため、接着剤等により各濾材の繊維間の隙間が塞がれないので、両濾材の接合に係る部分の面積増大を抑制することができる。   In the above-described configuration, the laminated first filter medium and second filter medium are joined by welding at a portion where the chemical fibers included in the two overlap each other. That is, since both members are welded directly at the joint portion between both members, the bonding strength between the first filter medium and the second filter medium can be increased. Further, in the above-described configuration, the third member such as an adhesive is not used for joining the first filter medium and the second filter medium. For this reason, since the clearance gap between the fibers of each filter medium is not obstruct | occluded with an adhesive agent etc., the area increase of the part which concerns on joining of both filter media can be suppressed.

本発明の請求項２に記載の燃料フィルタは、フィルタ部材において第１化学繊維と第２化学繊維とが溶着している接合部は第１濾材および第２濾材の接合面内に点状に形成され且つ均一に分布していることを特徴としている。   In the fuel filter according to claim 2 of the present invention, the joint where the first chemical fiber and the second chemical fiber are welded to each other in the filter member is formed in a dot shape within the joint surface of the first filter medium and the second filter medium. And is uniformly distributed.

上述の構成によれば、積層された第１濾材と第２濾材との接合部を点状且つ均一に分布させることで、第１濾材と第２濾材との接合強度を高めると同時に、両濾材の接合に係る部分の面積増大を抑制することができる。   According to the above-described configuration, joint strength between the first filter medium and the second filter medium is increased by distributing the joint portions of the laminated first filter medium and the second filter medium in a dotted and uniform manner, and at the same time, both filter media. An increase in the area of the portion related to the bonding can be suppressed.

この場合、本発明の請求項４に記載の燃料フィルタのように、フィルタエレメントが、フィルタ部材をフィルタ部材の幅方向に伸びる山および谷がフィルタ部材の長手方向に交互に配列され且つフィルタ部材の長手方向を周方向とする円筒状にして構成され、円筒状に形成されたフィルタエレメントの径方向にフィルタエレメントを通過して燃料が流れる構成とすれば、第１濾材と第２濾材との接合強度が高められるという効果を活かしたフィルタエレメント形状を実現することができる。   In this case, as in the fuel filter according to claim 4 of the present invention, the filter element has peaks and valleys extending alternately in the longitudinal direction of the filter member, and peaks and valleys extending from the filter member in the width direction of the filter member. If it is configured to have a cylindrical shape having a longitudinal direction as a circumferential direction, and the fuel flows through the filter element in the radial direction of the filter element formed in the cylindrical shape, the first filter medium and the second filter medium are joined. It is possible to realize a filter element shape taking advantage of the effect of increasing the strength.

本発明の請求項３に記載の燃料フィルタは、フィルタ部材は細長い帯状に形成され、第１濾材および第２濾材の接合面においてフィルタ部材の幅方向の少なくとも一方の端部はフィルタ部材の長手方向の全長にわたり連続して溶着接合されていることを特徴としている。   In the fuel filter according to claim 3 of the present invention, the filter member is formed in an elongated strip shape, and at least one end portion in the width direction of the filter member at the joining surface of the first filter medium and the second filter medium is the longitudinal direction of the filter member. It is characterized by being continuously welded and joined over the entire length.

上述の構成によれば、積層された第１濾材と第２濾材との接合部を点状且つ均一に分布させることで、第１濾材と第２濾材との接合強度を高めると同時に、両濾材の接合に係る部分の面積増大を抑制することができる。また、フィルタ部材の幅方向の両端部をフィルタ部材の長手方向の全長にわたり連続して溶着接合することにより、フィルタ部材の幅方向の両端部におけるフィルタ部材と外部との燃料の流入・流出を抑制することができる。   According to the above-described configuration, joint strength between the first filter medium and the second filter medium is increased by distributing the joint portions of the laminated first filter medium and the second filter medium in a dotted and uniform manner, and at the same time, both filter media. An increase in the area of the portion related to the bonding can be suppressed. In addition, by continuously welding and joining both end portions in the width direction of the filter member over the entire length in the longitudinal direction of the filter member, inflow and outflow of fuel between the filter member and the outside at both end portions in the width direction of the filter member are suppressed. can do.

この場合、本発明の請求項５に記載の燃料フィルタのように、フィルタエレメントは、フィルタ部材をフィルタ部材の幅方向に二つ折にして且つそれを渦巻状に重ねて円筒状にして構成され、円筒状に形成されたフィルタエレメントの軸方向にフィルタエレメントを通過して燃料が流れる構成とすれば、第１濾材と第２濾材との接合強度が高められるという効果を活かしたフィルタエレメント形状を実現することができる。   In this case, as in the fuel filter according to claim 5 of the present invention, the filter element is formed in a cylindrical shape by folding the filter member in two in the width direction of the filter member and overlapping it in a spiral shape, A filter element shape that takes advantage of the effect of increasing the bonding strength between the first filter medium and the second filter medium if the fuel flows through the filter element in the axial direction of the filter element formed in a cylindrical shape. can do.

本発明の請求項６に記載の燃料フィルタは、第２濾材はフィルタエレメントを通過する燃料流れ方向において第１濾材よりも上流側に配置されたことを特徴としている。   The fuel filter according to claim 6 of the present invention is characterized in that the second filter medium is disposed upstream of the first filter medium in the fuel flow direction passing through the filter element.

上述の構成によれば、燃料が燃料フィルタを通過するときに、燃料は、先ず撥水性を有する第２濾材を通過し続いて第１濾材を通過する。このとき、燃料中に混入している水（微細な水滴状）は、第２濾材の撥水作用によりはじかれて第２濾材の表面に凝集し大きな水滴となる。そして、燃料、たとえば軽油、ガソリン等と水との比重量差によりフィルタエレメントよりも下方へ移動し沈殿する。したがって、第２濾材よりも燃料流れの下流側に位置する第１濾材へは、予め水分が除去されている燃料が流入することになる。そして、燃料中に混入している水分以外の異物、たとえば金属の砕片等の固形物が第１濾材により捕集される。   According to the above configuration, when the fuel passes through the fuel filter, the fuel first passes through the second filter medium having water repellency and then passes through the first filter medium. At this time, water (fine water droplets) mixed in the fuel is repelled by the water repellent action of the second filter medium and aggregates on the surface of the second filter medium to form large water droplets. Then, due to the specific weight difference between fuel, for example, light oil, gasoline, etc., and water, it moves below the filter element and precipitates. Therefore, the fuel from which moisture has been previously removed flows into the first filter medium located on the downstream side of the fuel flow with respect to the second filter medium. And foreign substances other than the water | moisture content mixed in the fuel, for example, solid matters, such as a metal fragment, are collected by the 1st filter medium.

ここで、フィルタエレメントを通過する燃料流れ方向において、第１濾材および第２濾材の位置関係が本発明の請求項６に記載の燃料フィルタと反対の場合を考える。この場合、燃料中に混入している水分以外の異物である各種固形物が、先ず第１濾材により捕集される。燃料中に混入している水分は、第１濾材を通過し第２濾材の撥水作用によりはじかれて第２濾材の表面に凝集する。つまり、第２濾材によりはじかれた水分は第１濾材中に滞留することになる。このため、第１濾材である不織布を形成する繊維間の隙間に水が充満してしまい、燃料中に混入している水分以外の異物である各種固形物を捕集する空間が減少し異物捕集能力が低下してしまう。すなわち、第１濾材および第２濾材の位置関係を本発明の請求項６に記載の燃料フィルタと反対にすると、フィルタエレメントとしての異物捕集能力が、本発明の請求項６に記載の燃料フィルタの場合よりも早期に低下することになる。   Here, a case is considered in which the positional relationship between the first filter medium and the second filter medium is opposite to that of the fuel filter according to claim 6 of the present invention in the fuel flow direction passing through the filter element. In this case, various solids that are foreign matters other than moisture mixed in the fuel are first collected by the first filter medium. Moisture mixed in the fuel passes through the first filter medium, is repelled by the water repellent action of the second filter medium, and aggregates on the surface of the second filter medium. That is, the water repelled by the second filter medium stays in the first filter medium. For this reason, water fills the gaps between the fibers forming the nonwoven fabric, which is the first filter medium, and the space for collecting various solids, which are foreign matters other than moisture mixed in the fuel, is reduced. Collecting ability will decrease. That is, when the positional relationship between the first filter medium and the second filter medium is opposite to that of the fuel filter according to claim 6 of the present invention, the foreign matter collecting ability as a filter element is the fuel filter according to claim 6 of the present invention. It will fall earlier than the case.

以上から、本発明の請求項６に記載の燃料フィルタによれば、第１濾材と第２濾材との接合強度を高められ且つ両濾材の接合に係る部分の面積増大を抑制できるという効果を発揮しつつ、燃料フィルタの異物捕集能力を長期間にわたり良好に維持することが可能となる。   As described above, according to the fuel filter of the sixth aspect of the present invention, it is possible to increase the bonding strength between the first filter medium and the second filter medium, and to suppress the increase in the area of the portion related to the bonding of both filter media. However, the foreign matter collecting ability of the fuel filter can be maintained well over a long period of time.

以下、本発明の実施形態に係る燃料フィルタ１について、各図に基づいて説明する。   Hereinafter, the fuel filter 1 which concerns on embodiment of this invention is demonstrated based on each figure.

（第１実施形態）
本発明の第１実施形態に係る燃料フィルタ１は、自動車において、燃料タンク（図示せず）の燃料をエンジン（図示せず）へ供給する燃料配管の途中に設置されている。本実施形態において燃料は軽油であり、エンジンはディーゼルエンジンである。 (First embodiment)
The fuel filter 1 according to the first embodiment of the present invention is installed in the middle of a fuel pipe for supplying fuel from a fuel tank (not shown) to an engine (not shown) in an automobile. In this embodiment, the fuel is light oil and the engine is a diesel engine.

燃料フィルタ１は、大きくは、図１に示すようにケーシング２０内に燃料を濾過するフィルタエレメント３０を収容して形成されている。図１の上方が、燃料フィルタ１が自動車に取り付けられた状態における上方である。燃料は、ケーシング２０に設けられた入り口２１から燃料フィルタ１内に流入し、燃料フィルタ１内を図１中の矢印で示す方向に流れ、ケーシング２０に設けられた出口２２から燃料フィルタ１外へ流出する。燃料がフィルタエレメント３０を通過する際に、燃料中に混入している水分（微細な水滴状）はフィルタエレメント３０の撥水作用により弾かれてフィルタエレメント３０の表面に付着し凝集する。そして、軽油と水との比重量差によりフィルタエレメント３０から離脱してケーシング２０の底部に沈殿する。燃料から分離された水の沈殿量が所定量に達すると、図示しない水量検出器から信号が発せられ、それに基づいて、運転者が操作することにより、あるいは自動式排出弁が作動することにより、沈殿水はケーシング２０外へ排出される。一方、燃料中に混入している異物（固形物）は、燃料がフィルタエレメント３０を通過する際に、フィルタエレメント３０を構成する後述する不織布の繊維に捕集され、フィルタエレメント３０内に滞留する。以上説明した作用により、燃料中に混入している微細な水滴および固定物が燃料フィルタ１により捕集され、これらが除去された清浄な燃料がエンジンへ供給される。   The fuel filter 1 is generally formed by housing a filter element 30 for filtering fuel in a casing 20 as shown in FIG. The upper side of FIG. 1 is the upper side in a state where the fuel filter 1 is attached to the automobile. Fuel flows into the fuel filter 1 from the inlet 21 provided in the casing 20, flows in the fuel filter 1 in the direction indicated by the arrow in FIG. 1, and exits the fuel filter 1 from the outlet 22 provided in the casing 20. leak. When the fuel passes through the filter element 30, the water (fine water droplets) mixed in the fuel is repelled by the water repellent action of the filter element 30 and adheres to the surface of the filter element 30 and aggregates. Then, it separates from the filter element 30 due to the specific weight difference between the light oil and water and settles at the bottom of the casing 20. When the amount of precipitated water separated from the fuel reaches a predetermined amount, a signal is emitted from a water amount detector (not shown), and based on that, the driver operates or the automatic discharge valve operates, The precipitated water is discharged out of the casing 20. On the other hand, the foreign matter (solid matter) mixed in the fuel is collected by non-woven fabric fibers (described later) constituting the filter element 30 and stays in the filter element 30 when the fuel passes through the filter element 30. . By the operation described above, fine water droplets and fixed matters mixed in the fuel are collected by the fuel filter 1, and clean fuel from which these are removed is supplied to the engine.

以下に、本発明の第１実施形態に係る燃料フィルタ１の主要構成部材であるフィルタエレメント３０の構成について説明する。   Below, the structure of the filter element 30 which is a main structural member of the fuel filter 1 which concerns on 1st Embodiment of this invention is demonstrated.

フィルタエレメント３０は、図４に示すように、第１濾材である濾紙３１および第２濾材である撥水シート３２をそれぞれの厚さ方向に積層し接合することにより形成されたフィルタ部材であるフィルタシート３３を、図２に示すように、パイプ状の心材３４の周りに渦巻き状に巻きつけて形成されている。   As shown in FIG. 4, the filter element 30 is a filter member that is formed by laminating and bonding a filter paper 31 as a first filter medium and a water repellent sheet 32 as a second filter medium in the respective thickness directions. As shown in FIG. 2, the sheet 33 is formed by spirally winding around a pipe-shaped core material 34.

第１濾材である濾紙３１は、パルプ繊維３１ａと第１化学繊維としてのたとえばポリエステル繊維３１ｂとを混繊した不織布として形成されている。濾紙３１は、その厚さ方向における一方の端面側にポリエステル繊維３１ｂを高密度で分布させ、且つ他方の端面側にパルプ繊維３１ａを高密度で分布させて形成されている。濾紙３１および撥水シート３２を積層接合してフィルタシート３３を形成するときに、濾紙３１のポリエステル繊維３１ｂが高密度で分布している側が撥水シート３２との接合面になる。   The filter paper 31 as the first filter medium is formed as a nonwoven fabric in which pulp fibers 31a and, for example, polyester fibers 31b as the first chemical fibers are mixed. The filter paper 31 is formed by distributing the polyester fibers 31b at a high density on one end face side in the thickness direction and distributing the pulp fibers 31a at a high density on the other end face side. When the filter paper 31 and the water repellent sheet 32 are laminated and bonded to form the filter sheet 33, the side on which the polyester fibers 31 b of the filter paper 31 are distributed at a high density becomes the bonding surface with the water repellent sheet 32.

第２濾材である撥水シート３２は、撥水性を有する第２化学繊維としての、たとえばポリブチレンテレフタレート（以降ＰＢＴと表す）繊維３２ａからなる不織布として形成されている。   The water repellent sheet 32 that is the second filter medium is formed as a non-woven fabric made of, for example, polybutylene terephthalate (hereinafter referred to as PBT) fiber 32a as the second chemical fiber having water repellency.

次に、フィルタ部材であるフィルタシート３３の構成について、その製造方法も含めて説明する。   Next, the structure of the filter sheet 33 which is a filter member will be described including its manufacturing method.

フィルタシート３３は、図３に示すように、濾紙３１と撥水シート３２とを積層し接合してなり、且つ所定の幅の長い帯状に形成される。本発明の第１実施形態による燃料フィルタ１の場合、図４に示すように、濾紙３１のポリエステル繊維３１ｂが高密度で分布している側の面を、撥水シート３２側、つまり濾紙３１と撥水シート３２との接合面としている。これにより、濾紙３１と撥水シート３２との境界面において、濾紙３１のポリエステル繊維３１ｂと撥水シート３２のＰＢＴ繊維３２ａとが直接対向しているので、濾紙３１および撥水シート３２の境界面の全域において、濾紙３１のポリエステル繊維３１ｂと撥水シート３２のＰＢＴ繊維３２ａとの交差点が無数且つ均一に分布することになる。したがって、濾紙３１と撥水シート３２を重ねて、その厚さ方向から加圧するとともに加熱すれば、濾紙３１のポリエステル繊維３１ｂと撥水シート３２のＰＢＴ繊維３２ａとが、その交差部位において溶融し両者が一体的に溶着することになる。すなわち、濾紙３１と撥水シート３２の境界面において濾紙３１のポリエステル繊維３１ｂと撥水シート３２のＰＢＴ繊維３２ａとが溶着することにより、濾紙３１と撥水シート３２が接合される。   As shown in FIG. 3, the filter sheet 33 is formed by laminating and bonding a filter paper 31 and a water repellent sheet 32, and is formed in a strip shape having a predetermined width. In the case of the fuel filter 1 according to the first embodiment of the present invention, as shown in FIG. 4, the surface of the filter paper 31 on which the polyester fibers 31b are distributed with high density is the water repellent sheet 32 side, that is, the filter paper 31. The joint surface with the water repellent sheet 32 is used. Thereby, since the polyester fiber 31b of the filter paper 31 and the PBT fiber 32a of the water repellent sheet 32 are directly opposed at the boundary surface between the filter paper 31 and the water repellent sheet 32, the boundary surface between the filter paper 31 and the water repellent sheet 32 is obtained. The crossing points of the polyester fibers 31b of the filter paper 31 and the PBT fibers 32a of the water-repellent sheet 32 are distributed innumerably and uniformly in the entire area. Therefore, if the filter paper 31 and the water repellent sheet 32 are overlapped and pressurized from the thickness direction and heated, the polyester fiber 31b of the filter paper 31 and the PBT fiber 32a of the water repellent sheet 32 are melted at the intersection. Will be welded together. That is, the filter paper 31 and the water-repellent sheet 32 are joined by welding the polyester fiber 31b of the filter paper 31 and the PBT fiber 32a of the water-repellent sheet 32 at the interface between the filter paper 31 and the water-repellent sheet 32.

本発明の第１実施形態による燃料フィルタ１のフィルタシート３３は、図３に示すように、フィルタシート３３の幅方向の両端部が、フィルタシート３３の長手方向の全長にわたり線状に接合されている。つまり、ポリエステル繊維３１ｂと撥水シート３２のＰＢＴ繊維３２ａとの溶着点が線状に連続してなる連続溶着部３３ａが形成されている。また、フィルタシート３３における中央部分、すなわち両連続溶着部３３ａに挟まれた領域には、多数の点状溶着部３３ｂが規則的に分布して形成されている。図３において、連続溶着部３３ａおよび点状溶着部３３ｂは、分かりやすさのためにフィルタシート３３の表面に示しているが、実際は、濾紙３１と撥水シート３２との接合面に形成されている。   As shown in FIG. 3, the filter sheet 33 of the fuel filter 1 according to the first embodiment of the present invention has both end portions in the width direction of the filter sheet 33 joined linearly over the entire length of the filter sheet 33 in the longitudinal direction. Yes. That is, the continuous welding part 33a in which the welding point of the polyester fiber 31b and the PBT fiber 32a of the water repellent sheet 32 continues linearly is formed. Further, in the central portion of the filter sheet 33, that is, the region sandwiched between the two continuous welds 33a, a large number of spot welds 33b are regularly distributed. In FIG. 3, the continuous welded portion 33 a and the dotted welded portion 33 b are shown on the surface of the filter sheet 33 for the sake of clarity, but in actuality, they are formed on the joint surface between the filter paper 31 and the water repellent sheet 32. Yes.

次に、本発明の第１実施形態による燃料フィルタ１のフィルタシート３３の具体的な製造方法、詳しくは、濾紙３１および撥水シート３２の接合方法について説明する。   Next, a specific method for manufacturing the filter sheet 33 of the fuel filter 1 according to the first embodiment of the present invention, specifically, a method for joining the filter paper 31 and the water repellent sheet 32 will be described.

本発明の第１実施形態による燃料フィルタ１のフィルタシート３３は、超音波溶着により接合されている。すなわち、図５に示すように、濾紙３１および撥水シート３２をその積層方向の両側から互いに対向している複数対の超音波振動子で挟み、これらの超音波振動子を押圧しつつ振動させ、超音波振動子に挟まれた領域における濾紙３１および撥水シート３２の境界面に存在しているポリエステル繊維３１ｂおよびＰＢＴ繊維３２ａを振動による摩擦熱により溶着させ、両化学繊維が溶着することにより濾紙３１および撥水シート３２が接合される。   The filter sheet 33 of the fuel filter 1 according to the first embodiment of the present invention is joined by ultrasonic welding. That is, as shown in FIG. 5, the filter paper 31 and the water-repellent sheet 32 are sandwiched between a plurality of pairs of ultrasonic transducers facing each other from both sides in the stacking direction, and these ultrasonic transducers are vibrated while being pressed. The polyester fiber 31b and the PBT fiber 32a existing on the boundary surface between the filter paper 31 and the water repellent sheet 32 in the region sandwiched between the ultrasonic vibrators are welded by frictional heat due to vibration, and both chemical fibers are welded. The filter paper 31 and the water repellent sheet 32 are joined.

ところで、従来のフィルタ用濾材における上流側濾材層と下流側濾材層抵抗素子との接合方法の一つであるエンボス加工の場合、熱可塑性樹脂製不織布を部分的に溶融させて濾紙と接合しているが、この接合状態は貼着であり、本発明の第１実施形態による燃料フィルタ１のフィルタシート３３における接合方法である溶着と比較すると接合強度が低い。そのため、従来のフィルタ用濾材をさらに種々の形状に加工することが困難であるという問題があった。また、従来のフィルタ用濾材における上流側濾材層と下流側濾材層抵抗素子との接合方法の別の方法であるラミネート加工の場合、両濾材層の間にホットメルトシートを挟み、熱を加えて加圧することで、ホットメルトシートを介して両濾材層を接着している。この場合も、両濾材の十分な接合強度が得られない、さらに、ホットメルトシートが介在している部分の面積が広く、有効濾過面積が小さくなるため、要求される濾過面積を確保するためにフィルタ用濾材の体格が大きくなってしまう、という問題があった。   By the way, in the case of embossing which is one of the joining methods of the upstream filter media layer and the downstream filter media layer resistance element in the conventional filter media, the thermoplastic nonwoven fabric is partially melted and joined to the filter paper. However, this joining state is sticking, and joining strength is low compared with welding which is a joining method in the filter sheet 33 of the fuel filter 1 according to the first embodiment of the present invention. Therefore, there is a problem that it is difficult to further process the conventional filter medium into various shapes. In addition, in the case of laminating, which is another method for joining the upstream filter medium layer and the downstream filter medium layer resistance element in the conventional filter medium, a hot melt sheet is sandwiched between the two filter medium layers, and heat is applied. By pressurizing, both filter media layers are bonded via the hot melt sheet. Also in this case, sufficient bonding strength between the two filter media cannot be obtained, and furthermore, the area of the portion where the hot melt sheet is interposed is wide and the effective filtration area is small, so that the required filtration area is secured. There was a problem that the size of the filter medium for the filter became large.

これに対して、本発明の第１実施形態による燃料フィルタ１のフィルタシート３３は、濾紙３１のポリエステル繊維３１ｂと撥水シート３２のＰＢＴ繊維３２ａとが溶着することにより、濾紙３１と撥水シート３２を接合して形成される。つまり、両化学繊維が溶融して一体化しているので、接合強度を高めることができる。また、両濾材の接合に第３の部材、たとえばホットメルトシート等を用いないので、接合に係る部分の面積増大を抑制することができる。さらには、両濾材の接合強度が高いので、フィルタシート３３を加工してフィルタエレメント３０を形成する際に、複雑な形状のフィルタエレメント３０を、フィルタシート３３における濾紙３１および撥水シート３２の良好な接合状態を保ちつつ容易に形成することができる。   On the other hand, the filter sheet 33 of the fuel filter 1 according to the first embodiment of the present invention has the filter paper 31 and the water repellent sheet formed by welding the polyester fibers 31b of the filter paper 31 and the PBT fibers 32a of the water repellent sheet 32. 32 are joined. That is, since both chemical fibers are melted and integrated, the bonding strength can be increased. In addition, since the third member, for example, a hot melt sheet or the like is not used for joining the two filter media, an increase in the area of the part related to joining can be suppressed. Furthermore, since the bonding strength between the two filter media is high, when the filter sheet 33 is processed to form the filter element 30, the filter element 30 having a complicated shape can be used as the filter paper 31 and the water repellent sheet 32 in the filter sheet 33. It can be easily formed while maintaining a simple joined state.

次に、以上説明した特徴を有するフィルタシート３３を用いて形成されたフィルタエレメント３０の構成について説明する。   Next, the configuration of the filter element 30 formed using the filter sheet 33 having the characteristics described above will be described.

本発明の第１実施形態による燃料フィルタ１のフィルタエレメント３０は、先に説明したように形成されたフィルタシート３３を２枚、各フィルタシート３３の撥水シート３２同士を対向させて重ねて、詳しくは、図６に示すように、一枚は平滑な帯状のままのもの、もう一枚は波型に成型したもの、を各フィルタシート３３の撥水シート３２同士を対向させて重ねて、図２に示すように、パイプ状の芯材３４の周りに渦巻状に巻きつけて円柱状に形成されている。これら二枚のフィルタシート３３同士は接触部、つまり波型のフィルタシート３３と平滑状のフィルタシート３３との接線部において接着材により接着されている。そして、図２に示すように、円柱状に形成されたフィルタエレメント３０の軸方向の両端部の一方、言い換えると、フィルタシート３３の幅方向の両端部の一方の端部３０ａにおいては、２枚のフィルタシート３３の各濾紙３１により囲まれる開口部を充填材Ｆで塞ぐとともに、円柱状のフィルタエレメント３０の軸方向の両端部の他方の端部３０ｂにおいては、２枚のフィルタシート３３の各撥水シート３２により囲まれる開口部を充填材Ｆで塞いでいる。このように形成されたフィルタエレメント３０は、ケーシング２０内において図１に示すように収容され、燃料は、フィルタエレメント３０の端部３０ａから端部３０ｂに向かって流れる。すなわち、燃料は、図８に示すように、フィルタエレメント３０の端部３０ａにおいて撥水シート３２により囲まれた開口部からフィルタエレメント３０内に流入し、撥水シート３２、濾紙３１の順に通過して、フィルタエレメント３０の端部３０ｂにおいて濾紙３１により囲まれた開口部からフィルタエレメント３０外へ流出する。なお、端部３０ｂ側の撥水シート３２により囲まれる開口部は、充填剤Ｆで塞がれるため、図３に示される２本の連続溶着部３３ａの内の１本は省略可能である。   The filter element 30 of the fuel filter 1 according to the first embodiment of the present invention includes two filter sheets 33 formed as described above, and the water repellent sheets 32 of the filter sheets 33 facing each other. Specifically, as shown in FIG. 6, one sheet is kept in a smooth strip shape, and the other is formed into a corrugated shape, with the water-repellent sheets 32 of the filter sheets 33 facing each other, As shown in FIG. 2, the pipe-shaped core member 34 is wound around in a spiral shape and formed into a columnar shape. The two filter sheets 33 are bonded to each other by an adhesive at a contact portion, that is, a tangential portion between the corrugated filter sheet 33 and the smooth filter sheet 33. As shown in FIG. 2, two sheets are provided at one end 30 a in the axial direction of the filter element 30 formed in a columnar shape, in other words, at one end 30 a at both ends in the width direction of the filter sheet 33. The openings surrounded by the filter papers 31 of the filter sheet 33 are closed with the filler F, and at the other end 30b of the both ends in the axial direction of the columnar filter element 30, each of the two filter sheets 33 is provided. An opening surrounded by the water repellent sheet 32 is closed with a filler F. The filter element 30 formed in this way is accommodated in the casing 20 as shown in FIG. 1, and the fuel flows from the end 30 a of the filter element 30 toward the end 30 b. That is, as shown in FIG. 8, the fuel flows into the filter element 30 from the opening surrounded by the water repellent sheet 32 at the end 30a of the filter element 30, and passes through the water repellent sheet 32 and the filter paper 31 in this order. Then, the filter element 30 flows out of the filter element 30 through the opening surrounded by the filter paper 31 at the end 30b of the filter element 30. Since the opening surrounded by the water repellent sheet 32 on the end 30b side is closed with the filler F, one of the two continuous welds 33a shown in FIG. 3 can be omitted.

本発明の第１実施形態による燃料フィルタ１のフィルタエレメント３０においては、撥水シート３２は、フィルタエレメント３０を通過する燃料の流れ方向において濾紙３１よりも上流側に配置されている。このような構成としたことにより、燃料は、フィルタエレメント３０を通過するにあたって、先ず撥水性を有する撥水シート３０を通過し、続いて濾紙３１を通過する。このとき、燃料中に混入している水（微細な水滴）は、撥水シート３２の撥水作用によりはじかれて撥水シート３２の表面、つまりフィルタエレメント３０の外側表面に凝集し大きな水滴となる。そして、図１に示すように、この水滴Ｗは燃料である軽油と水との比重量差によりフィルタエレメント３０よりも下方へ移動しケーシング２０内の底部に沈殿滞留する。このため、撥水シート３２よりも燃料流れの下流側に位置する濾紙３１へは、撥水シート３２により既に水分が除去された軽油が流入する。そして、軽油中に混入している水分以外の異物、たとえば金属の砕片等の固形物が濾紙３１により捕集される。   In the filter element 30 of the fuel filter 1 according to the first embodiment of the present invention, the water repellent sheet 32 is disposed upstream of the filter paper 31 in the flow direction of the fuel passing through the filter element 30. With this configuration, the fuel first passes through the water-repellent sheet 30 having water repellency and then passes through the filter paper 31 when passing through the filter element 30. At this time, water (fine water droplets) mixed in the fuel is repelled by the water repellent action of the water repellent sheet 32 and aggregates on the surface of the water repellent sheet 32, that is, the outer surface of the filter element 30. Become. As shown in FIG. 1, the water droplets W move below the filter element 30 due to the specific weight difference between the light oil as the fuel and the water, and settle and stay at the bottom of the casing 20. For this reason, light oil from which water has already been removed by the water repellent sheet 32 flows into the filter paper 31 located downstream of the water repellent sheet 32. Then, foreign matters other than moisture mixed in the light oil, for example, solids such as metal fragments are collected by the filter paper 31.

ここで、濾紙３１および撥水シート３２のフィルタエレメント３０を通過する燃料流れ方向における位置関係が、上述の実施形態とは反対の場合を考える。この場合は、軽油中に混入している水分以外の異物である各種固形物が、先ず濾紙３１により捕集される。軽油中に混入している水分は、濾紙３１を通過して撥水シート３２に至り、そこで撥水シート３２の撥水作用によりはじかれて撥水シート３２を通過できずに濾紙３１中に滞留する。このため、濾紙３１を形成する繊であるパルプ繊維３１ａおよびポリエステル繊維３１ｂ間の隙間に水が充満してしまい、燃料中に混入している水分以外の異物である各種固形物を捕集する空間が減少し異物捕集能力が低下する。すなわち、濾紙３１および撥水シート３２のフィルタエレメント３０を通過する燃料流れ方向における位置関係を本発明の第１実施形態による燃料フィルタ１のフィルタエレメント３０と反対にすると、フィルタエレメント３０の異物捕集能力が早期に低下することになる。   Here, a case is considered in which the positional relationship of the filter paper 31 and the water repellent sheet 32 in the fuel flow direction passing through the filter element 30 is opposite to that of the above-described embodiment. In this case, various solids that are foreign matters other than moisture mixed in the light oil are first collected by the filter paper 31. The water mixed in the light oil passes through the filter paper 31 and reaches the water-repellent sheet 32, where it is repelled by the water-repellent action of the water-repellent sheet 32 and cannot pass through the water-repellent sheet 32 and stays in the filter paper 31. To do. For this reason, the space between the pulp fibers 31a and the polyester fibers 31b, which are the fibers forming the filter paper 31, is filled with water, and a space for collecting various solids that are foreign matters other than moisture mixed in the fuel. Decreases and the foreign matter collecting ability decreases. That is, when the positional relationship in the fuel flow direction of the filter paper 31 and the water repellent sheet 32 passing through the filter element 30 is reversed from that of the filter element 30 of the fuel filter 1 according to the first embodiment of the present invention, the foreign matter collection of the filter element 30 Capability will decline early.

以上から、本発明の第１実施形態による燃料フィルタ１のフィルタエレメント３０によれば、濾紙３１と撥水シート３２との接合強度を高め且つ両濾材の接合に係る部分の面積増大を抑制できるという効果を発揮しつつ、燃料フィルタ１の異物捕集能力を長期間にわたり良好に維持することが可能となる。   From the above, according to the filter element 30 of the fuel filter 1 according to the first embodiment of the present invention, it is possible to increase the bonding strength between the filter paper 31 and the water repellent sheet 32 and to suppress an increase in the area of the portion related to the bonding of both filter media. It is possible to maintain the foreign matter collecting ability of the fuel filter 1 satisfactorily for a long time while exhibiting the effect.

（第２実施形態）
次に、本発明の第２実施形態による燃料フィルタ１について説明する。本発明の第２実施形態による燃料フィルタ１は、本発明の第１実施形態による燃料フィルタ１に対して、フィルタシート３３の構成を同一としつつ、フィルタエレメントの構成を変更したものである。 (Second Embodiment)
Next, a fuel filter 1 according to a second embodiment of the present invention will be described. The fuel filter 1 according to the second embodiment of the present invention is obtained by changing the configuration of the filter element while making the configuration of the filter seat 33 the same as that of the fuel filter 1 according to the first embodiment of the present invention.

本発明の第２実施形態による燃料フィルタ１のフィルタエレメント４０は、図８に示すように、長い帯状に形成されたフィルタシート３３を、その幅方向に伸びる山Ｐおよび谷Ｖがフィルタシート３３の長手方向に交互に配列され、且つフィルタシート３３の長手方向を周方向とする円筒状に形成されている。フィルタシート３３の撥水シート３２が円筒状のフィルタエレメント４０の外周側に、濾紙３１が円筒状のフィルタエレメント４０の内周側に、あるようにしてフィルタエレメント４０が作られている。   As shown in FIG. 8, the filter element 40 of the fuel filter 1 according to the second embodiment of the present invention has a filter sheet 33 formed in a long strip shape, and peaks P and valleys V extending in the width direction of the filter sheet 33. The filter sheets 33 are alternately arranged in the longitudinal direction, and are formed in a cylindrical shape having the longitudinal direction of the filter sheet 33 as a circumferential direction. The filter element 40 is formed such that the water repellent sheet 32 of the filter sheet 33 is on the outer peripheral side of the cylindrical filter element 40 and the filter paper 31 is on the inner peripheral side of the cylindrical filter element 40.

本発明の第２実施形態による燃料フィルタ１において、燃料は、図１０に示すように、ケーシング２０の入り口２１を経て、円筒状に形成されたフィルタエレメント３０の外周側から内周側へ向かって流れ、ケーシング２０の出口２２を経てエンジンへ供給される。   In the fuel filter 1 according to the second embodiment of the present invention, as shown in FIG. 10, the fuel passes through the inlet 21 of the casing 20 from the outer peripheral side of the cylindrical filter element 30 toward the inner peripheral side. It flows through the outlet 22 of the casing 20 and is supplied to the engine.

本発明の第２実施形態による燃料フィルタ１においては、フィルタエレメント４０において、図９に示すように、その外周側に撥水シート３２が、内周側に濾紙３１が配置されている。すなわち、撥水シート３２は、フィルタエレメント４０を通過する燃料の流れ方向において濾紙３１よりも上流側に配置されている。したがって、本発明の第２実施形態による燃料フィルタ１においても、先に説明した本発明の第１実施形態による燃料フィルタ１の場合と同様の効果、すなわちに、濾紙３１と撥水シート３２との接合強度を高め且つ両濾材の接合に係る部分の面積増大を抑制できるという効果を発揮しつつ、燃料フィルタ１の異物捕集能力を長期間にわたり良好に維持することができる、という効果が得られる。   In the fuel filter 1 according to the second embodiment of the present invention, in the filter element 40, as shown in FIG. 9, a water-repellent sheet 32 is disposed on the outer peripheral side, and a filter paper 31 is disposed on the inner peripheral side. In other words, the water repellent sheet 32 is disposed upstream of the filter paper 31 in the flow direction of the fuel passing through the filter element 40. Therefore, also in the fuel filter 1 according to the second embodiment of the present invention, the same effect as that of the fuel filter 1 according to the first embodiment of the present invention described above, that is, the filter paper 31 and the water repellent sheet 32 The effect that the foreign matter collecting ability of the fuel filter 1 can be well maintained for a long period of time can be obtained while exhibiting the effect that the joining strength can be increased and the increase in the area of the part related to the joining of both filter media can be suppressed. .

（第３実施形態）
次に、本発明の第３実施形態による燃料フィルタ１について説明する。本発明の第３実施形態による燃料フィルタ１は、本発明の第１実施形態による燃料フィルタ１に対して、フィルタシート３３の構成を同一としつつ、フィルタエレメントの構成を変更したものである。 (Third embodiment)
Next, a fuel filter 1 according to a third embodiment of the invention will be described. The fuel filter 1 according to the third embodiment of the present invention is obtained by changing the configuration of the filter element while making the configuration of the filter seat 33 the same as that of the fuel filter 1 according to the first embodiment of the present invention.

本発明の第３実施形態による燃料フィルタ１のフィルタエレメント５０は、図１１に示すように、長い帯状に形成されたフィルタシート３３を、その幅方向に二つ折に、詳しくは、撥水シート３２が外側に、濾紙３１が内側になるようにしてこの二つ折りにし、この二つ折りにしたものをパイプ状の芯材３４の周りに渦巻状に巻きつけて円柱状に形成されている。フィルタエレメント５０において、二つ折りにしたフィルタシート３３の折り目側が端部５０ａ、フィルタシート３３の幅方向の両端側が端部５０ｂとなっている。ここで、フィルタシート３３の二つ折りにした一方（図１１において外周側）はそのままとし、他方（図１１において内周側）部分には、図１１に示すように、波状の襞を形成している。この襞により、フィルタエレメント５０において、端部５０ａおよび端部５０ｂ間の燃料通路が確保される。   As shown in FIG. 11, the filter element 50 of the fuel filter 1 according to the third embodiment of the present invention has a filter sheet 33 formed in a long strip shape folded in two in the width direction. The filter paper 31 is folded in half so that the filter paper 31 is on the inside, and the folded product is spirally wound around a pipe-shaped core member 34 to form a columnar shape. In the filter element 50, the fold side of the filter sheet 33 folded in half is an end portion 50a, and both end sides in the width direction of the filter sheet 33 are end portions 50b. Here, the filter sheet 33 is folded in half (outer side in FIG. 11) as it is, and the other (inner side in FIG. 11) portion is formed with a wavy ridge as shown in FIG. Yes. As a result, in the filter element 50, a fuel passage between the end 50a and the end 50b is secured.

本発明の第３実施形態による燃料フィルタ１において、燃料は、図１２に示すように、ケーシング２０の入り口２１からパイプ状の芯材３４内を通過してフィルタエレメント５０の端部５０ａ側へ至る。からフィルタエレメント５０を通過して円筒状に形成されたフィルタエレメント５０の外周側から内周側へ向かって流れ、ケーシング２０の出口２２を経てエンジンへ供給される。   In the fuel filter 1 according to the third embodiment of the present invention, as shown in FIG. 12, the fuel passes from the inlet 21 of the casing 20 through the pipe-shaped core 34 to the end 50 a side of the filter element 50. . From the outer peripheral side of the filter element 50 formed in a cylindrical shape through the filter element 50 toward the inner peripheral side, and supplied to the engine via the outlet 22 of the casing 20.

本発明の第３実施形態による燃料フィルタ１においては、フィルタエレメント５０において、図９に示すように、撥水シート３２を、フィルタエレメント５０を通過する燃料の流れ方向において濾紙３１よりも上流側に配置されている。したがって、本発明の第３実施形態による燃料フィルタ１においても、先に説明した本発明の第１実施形態による燃料フィルタ１の場合と同様の効果、すなわちに、濾紙３１と撥水シート３２との接合強度を高め且つ両濾材の接合に係る部分の面積増大を抑制できるという効果を発揮しつつ、燃料フィルタ１の異物捕集能力を長期間にわたり良好に維持することができる、という効果が得られる。   In the fuel filter 1 according to the third embodiment of the present invention, in the filter element 50, the water-repellent sheet 32 is disposed upstream of the filter paper 31 in the flow direction of the fuel passing through the filter element 50, as shown in FIG. Has been placed. Therefore, also in the fuel filter 1 according to the third embodiment of the present invention, the same effect as that of the fuel filter 1 according to the first embodiment of the present invention described above, that is, between the filter paper 31 and the water repellent sheet 32 is obtained. The effect that the foreign matter collecting ability of the fuel filter 1 can be well maintained for a long period of time can be obtained while exhibiting the effect that the joining strength can be increased and the increase in the area of the part related to the joining of both filter media can be suppressed. .

以上説明した、本発明の第１〜第３実施形態による燃料フィルタ１においては、燃料を軽油としているが、軽油に限る必要は無い。他の種類の液体燃料、たとえばガソリン、メタノール、ガソリンとメタノールの混合液等に適用しても良い。   In the fuel filter 1 according to the first to third embodiments of the present invention described above, the fuel is light oil, but it is not necessary to be limited to light oil. The present invention may be applied to other types of liquid fuels such as gasoline, methanol, and a mixture of gasoline and methanol.

本発明の第１実施形態による燃料フィルタ１の断面図である。1 is a cross-sectional view of a fuel filter 1 according to a first embodiment of the present invention. フィルタエレメント３０の斜視外観である。It is a perspective appearance of the filter element 30. フィルタシート３３の斜視外観図である。3 is a perspective external view of a filter sheet 33. FIG. 図３中のＩＶ矢視図である。It is IV arrow line view in FIG. 図３中のＶ−Ｖ線断面図である。It is the VV sectional view taken on the line in FIG. フィルタエレメント３０の部分拡大図である。3 is a partially enlarged view of the filter element 30. FIG. 図２中のＶＩＩ−ＶＩＩ線断面図である。It is the VII-VII sectional view taken on the line in FIG. 本発明の第２実施形態による燃料フィルタ１のフィルタエレメント４０の斜視外観図である。It is a perspective appearance figure of filter element 40 of fuel filter 1 by a 2nd embodiment of the present invention. 図８中のＩＸ矢視部分拡大図であるIt is the IX arrow partial enlarged view in FIG. 本発明の第２実施形態による燃料フィルタ１の断面図である。It is sectional drawing of the fuel filter 1 by 2nd Embodiment of this invention. 本発明の第３実施形態による燃料フィルタ１のフィルタエレメント５０の斜視外観図である。It is a perspective appearance figure of filter element 50 of fuel filter 1 by a 3rd embodiment of the present invention. 本発明の第３実施形態による燃料フィルタ１の断面図である。It is sectional drawing of the fuel filter 1 by 3rd Embodiment of this invention.

符号の説明Explanation of symbols

１ 燃料フィルタ
２０ ケーシング
２１ 入り口
２２ 出口
３０ フィルタエレメント
３０ａ 端部
３０ｂ 端部
３１ 濾紙（第１濾材）
３１ａ パルプ繊維
３１ｂ ポリエステル繊維（第１化学繊維）
３２ 撥水シート（第２濾材）
３２ａ ＰＢＴ繊維（第２化学繊維）
３３ フィルタシート（フィルタ部材）
３４ 芯材
４０ フィルタエレメント
５０ フィルタエレメント
５０ａ 端部
５０ｂ 端部
Ｆ 充填材
Ｐ 山
Ｓ 超音波振動子
Ｖ 谷
Ｗ 水滴 DESCRIPTION OF SYMBOLS 1 Fuel filter 20 Casing 21 Inlet 22 Outlet 30 Filter element 30a End part 30b End part 31 Filter paper (1st filter medium)
31a Pulp fiber 31b Polyester fiber (first chemical fiber)
32 Water repellent sheet (second filter medium)
32a PBT fiber (second chemical fiber)
33 Filter sheet (filter member)
34 Core material 40 Filter element 50 Filter element 50a End 50b End F Filler P Mountain S Ultrasonic vibrator V Valley W Water drop

Claims (6)

第１化学繊維およびパルプ繊維を不織布シート状に混繊してなる第１濾材と撥水性を有する第２化学繊維を不織布シート状に形成してなる第２濾材とを積層して形成されたフィルタ部材から成るフィルタエレメントを備えた燃料フィルタであって、
前記フィルタ部材は、前記第１化学繊維と前記第２化学繊維とが溶着することにより接合していることを特徴とする燃料フィルタ。 A filter formed by laminating a first filter medium obtained by mixing first chemical fibers and pulp fibers into a nonwoven sheet and a second filter medium formed by forming second chemical fibers having water repellency into a nonwoven sheet. A fuel filter comprising a filter element comprising a member,
The fuel filter, wherein the filter member is joined by welding the first chemical fiber and the second chemical fiber. 前記フィルタ部材において前記第１化学繊維と前記第２化学繊維とが溶着している接合部は前記第１濾材および前記第２濾材の接合面内に点状に形成され且つ均一に分布していることを特徴とする請求項１に記載の燃料フィルタ。   In the filter member, the joint where the first chemical fiber and the second chemical fiber are welded is formed in a spot shape and uniformly distributed in the joint surface of the first filter medium and the second filter medium. The fuel filter according to claim 1. 前記フィルタ部材は細長い帯状に形成され、
前記第１濾材および前記第２濾材の接合面において前記フィルタ部材の幅方向の少なくとも一方の端部は前記フィルタ部材の長手方向の全長にわたり連続して溶着接合されていることを特徴とする請求項２に記載の燃料フィルタ。 The filter member is formed in an elongated strip shape,
The at least one end portion in the width direction of the filter member is continuously welded and joined over the entire length in the longitudinal direction of the filter member on the joining surface of the first filter medium and the second filter medium. 2. The fuel filter according to 2. 前記フィルタエレメントは、前記フィルタ部材を前記フィルタ部材の幅方向に伸びる山および谷が前記フィルタ部材の長手方向に交互に配列され且つ前記フィルタ部材の長手方向を周方向とする円筒状にして構成され、
円筒状に形成された前記フィルタエレメントの径方向に前記フィルタエレメントを通過して燃料が流れることを特徴とする請求項２に記載の燃料フィルタ。 The filter element is configured such that the filter member has a cylindrical shape in which peaks and valleys extending in the width direction of the filter member are alternately arranged in the longitudinal direction of the filter member and the longitudinal direction of the filter member is the circumferential direction. ,
The fuel filter according to claim 2, wherein fuel flows through the filter element in a radial direction of the filter element formed in a cylindrical shape. 前記フィルタエレメントは、前記フィルタ部材を前記フィルタ部材の幅方向に二つ折にして且つそれを渦巻状に重ねて円筒状にして構成され、
円筒状に形成された前記フィルタエレメントの軸方向に前記フィルタエレメントを通過して燃料が流れることを特徴とする請求項３に記載の燃料フィルタ。 The filter element is configured by folding the filter member into two in the width direction of the filter member and forming a cylindrical shape by overlapping it in a spiral shape,
The fuel filter according to claim 3, wherein fuel flows through the filter element in an axial direction of the filter element formed in a cylindrical shape. 前記第２濾材は前記フィルタエレメントを通過する燃料流れ方向において前記第１濾材よりも上流側に配置されたことを特徴とする請求項１ないし請求項５のいずれか一つに記載の燃料フィルタ。   The fuel filter according to any one of claims 1 to 5, wherein the second filter medium is disposed upstream of the first filter medium in a fuel flow direction passing through the filter element.
JP2007282742A 2007-10-31 2007-10-31 Fuel filter Pending JP2009106878A (en)

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