JP2005106030A - Pulsing diaphragm fuel pump - Google Patents

Pulsing diaphragm fuel pump Download PDF

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JP2005106030A
JP2005106030A JP2003344054A JP2003344054A JP2005106030A JP 2005106030 A JP2005106030 A JP 2005106030A JP 2003344054 A JP2003344054 A JP 2003344054A JP 2003344054 A JP2003344054 A JP 2003344054A JP 2005106030 A JP2005106030 A JP 2005106030A
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pump
pulse pressure
pressure chamber
chamber
diaphragm
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JP4320721B2 (en
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Yasushi Kobayashi
靖 小林
Gensaku Konagai
源策 小長井
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Nikki Co Ltd
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Nikki Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an atmospheric hole for preventing engine oil and liquid fuel from staying in a pulse pressure chamber, by stably performing going in and out of air over a long period without clogging, while reducing manufacturing cost with a simple constitution, in a pulsing diaphragm fuel pump. <P>SOLUTION: This pulsing diaphragm fuel pump is formed by superposing a pump body 1 forming a pump room 4, and a diaphragm cover body 3 forming the pulse pressure chamber 5, in an outside peripheral edge part by sandwiching a pump diaphragm 6 for partitioning the pump room and the pulse pressure chamber 5. The atmospheric hole 15 communicates the pulse pressure chamber 5 with the atmosphere, and is composed of an atmospheric side section 15b reaching a cushion chamber 15a from an intermediate cushion chamber 15a and of the atmospheric side of a pump outside part, and a pulse pressure chamber side section 15c reaching the pulse pressure chamber 5 from the cushion chamber 15a. The cushion chamber 15a and the atmospheric side section 15b are formed of a void arranged in a superposed place of the pump body 1 and the diaphragm cover body 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、エンジン運転に伴ってクランクケース内や吸気管内に発生する脈動圧力により駆動されてエンジンに供給するための燃料を輸送する脈動式ダイヤフラム燃料ポンプに関し、殊に、脈圧室と大気側とを連通させる大気孔を具えた脈動式ダイヤフラム燃料ポンプに関するものである。   The present invention relates to a pulsating diaphragm fuel pump that is driven by pulsating pressure generated in a crankcase or an intake pipe as the engine is operated, and transports fuel to be supplied to the engine. The present invention relates to a pulsating diaphragm fuel pump having an air hole that communicates with the pulsating diaphragm.

2サイクルまたは4サイクルの小型ガソリンエンジンに供給する燃料の輸送手段として、構造が簡単で機械的損失を伴わずに駆動できるという利点を有する脈動式ダイヤフラム燃料ポンプが広く利用されている。   2. Description of the Related Art Pulsating diaphragm fuel pumps that have the advantage of being simple in structure and capable of being driven without mechanical loss are widely used as means for transporting fuel supplied to a two-cycle or four-cycle small gasoline engine.

図4は、従来から利用されている周知の脈動式ダイヤフラム燃料ポンプを示す縦断面図であって、ポンプ本体51の一方の側にポンプダイヤフラム52により区画されたポンプ室54と脈圧室55とを備え、もう一方の側にはパルセータダイヤフラム56a,56bにより区画された吸込室57および吐出室58と空気室59a,59bとを備えている。またポンプ本体51のポンプ室54と吸込室57、吐出室58とを区画する仕切壁60には吸込弁61aおよび吐出弁61bが設けられている。   FIG. 4 is a longitudinal sectional view showing a well-known pulsating diaphragm fuel pump that has been conventionally used. A pump chamber 54 and a pulsation pressure chamber 55 which are partitioned by a pump diaphragm 52 on one side of the pump body 51 are shown. The other side is provided with a suction chamber 57 and a discharge chamber 58 and air chambers 59a and 59b partitioned by pulsator diaphragms 56a and 56b. A suction valve 61 a and a discharge valve 61 b are provided on the partition wall 60 that partitions the pump chamber 54, the suction chamber 57, and the discharge chamber 58 of the pump body 51.

そして、この脈動式ダイヤフラム燃料ポンプはエンジンの運転に伴いクランクケース内や吸気管内、多くはクランクケース内に発生する脈動圧力が脈圧導入路53により脈圧室55に導入されてポンプダイヤフラム52を往復変位させることにより、燃料タンクの燃料を吸込室57から吸込弁61aを経てポンプ室54に導入し、吐出弁61bを経て吐出室58に送出し、燃料出口62から図示しない気化器に送ってこれよりエンジンに供給するようになっている。   In this pulsating diaphragm fuel pump, the pulsating pressure generated in the crankcase and the intake pipe, mostly in the crankcase as the engine is operated, is introduced into the pulsating pressure chamber 55 by the pulsating pressure introducing passage 53 to cause the pump diaphragm 52 to enter. By reciprocating displacement, the fuel in the fuel tank is introduced from the suction chamber 57 to the pump chamber 54 via the suction valve 61a, sent to the discharge chamber 58 via the discharge valve 61b, and sent to the carburetor (not shown) from the fuel outlet 62. The engine is now supplied to the engine.

しかし、このような脈動式ダイヤフラム燃料ポンプはクランクケースや吸気管から脈動圧力を取り入れて利用するものであるため、エンジンオイルや液体燃料が脈圧室55に流入して溜まることがある。そのため、例えばエンジンオイルがポンプダイヤフラム52に付着すると早期劣化を生じさせやすく、また溜まった液体燃料がポンプの姿勢変化などによって脈圧室55から吸気管に一挙に流出することがあると、一時的に混合気を濃くしてエンジン運転を不調にしたり、エンジンを停止させたりする心配がある。   However, since such a pulsating diaphragm fuel pump is used by taking in pulsating pressure from a crankcase or an intake pipe, engine oil or liquid fuel may flow into the pulsating pressure chamber 55 and accumulate. Therefore, for example, if engine oil adheres to the pump diaphragm 52, early deterioration is likely to occur, and the accumulated liquid fuel may temporarily flow out of the pulse pressure chamber 55 to the intake pipe due to a change in the posture of the pump. However, there is a concern that the air-fuel mixture may become thicker and the engine operation may be disturbed or the engine may be stopped.

そこで、脈圧室と大気側とを連絡させる小径の大気孔を設けて脈圧室に大気を導入することで流入したエンジンオイルや液体燃料をこまめに排出・除去することが例えば特開2002―98055号公報に提案されている。このような大気孔は図4に符号63で示されており、脈動圧力に連動して脈圧室55に大気が出入りするようになっている。しかしながら、このような大気孔63は大気に直接開放しているので大気中の塵埃などの微細固形物によって目詰まりを生じる危険が大きい。   For this reason, for example, Japanese Patent Application Laid-Open No. 2002-2008 discloses that engine oil and liquid fuel that flow in are frequently discharged and removed by providing a small-diameter air hole that communicates the pulse pressure chamber with the atmosphere side and introducing the atmosphere into the pulse pressure chamber. This is proposed in Japanese Patent No. 98055. Such atmospheric holes are denoted by reference numeral 63 in FIG. 4, and the atmosphere enters and exits the pulsating pressure chamber 55 in conjunction with the pulsating pressure. However, since such atmospheric holes 63 are directly open to the atmosphere, there is a high risk of clogging due to fine solids such as dust in the atmosphere.

その対策として、図5の(A)に示すように大気孔63を小孔63aの大気側拡径支持筒63bにフィルタ63cを支持・固定したものとし、脈圧室55に導入される大気中の微細固形物をフィルタ63cで捕捉すること、或いは図5の(B)に示すように大気孔63の大気側開口部を保護プレート64で覆って大気中の微細固形物が大気孔63および脈圧室55に直接侵入しにくくすることが行われている。   As a countermeasure, it is assumed that the filter 63c is supported and fixed to the atmosphere side diameter expansion support cylinder 63b of the small hole 63a as shown in FIG. The fine solid matter in the atmosphere is captured by the filter 63c, or, as shown in FIG. It is made difficult to directly enter the pressure chamber 55.

これらの対策によると、微細固形物が大気孔を目詰まりさせることをある程度防ぐことができる。しかし、このような構成とするにはフィルタ63cや保護プレート64のような専用部品が必要となって部品点数が増加するとともに、組立の工程が増えて製造コストの高いものとなってしまう。さらに、図5の(A)の大気孔63においては長期間の使用でフィルタ63cに微細固形物が詰まってしまい、空気の出入りが阻害されて大気孔としての機能を果たすことができなくなり、また図5の(B)の大気孔63においては長期間の使用で大気孔63に微細固形物が詰まって大気の出入りが充分に確保されなくなるなど、長期間に亘って空気出入り機能を良好に維持させる対策として不満足である。
特開2002―98055号公報
According to these measures, it is possible to prevent the fine solid matter from clogging the air holes to some extent. However, such a configuration requires dedicated parts such as the filter 63c and the protection plate 64, which increases the number of parts and increases the number of assembly steps, resulting in high manufacturing costs. Further, in the air holes 63 in FIG. 5A, fine solids are clogged in the filter 63c after a long period of use, and the function of the air holes cannot be achieved due to the impediment to the entry and exit of air. In the air hole 63 of FIG. 5B, the air hole function is maintained well over a long period of time, such as when the air hole 63 is clogged with fine solids due to long-term use and the air flow is not sufficiently secured. It is unsatisfactory as a countermeasure.
JP 2002-98055 A

本発明は、上記のような問題点を解決しようとするものであり、脈動式ダイヤフラム燃料ポンプにおいて、簡易な構成で製造コストを低廉としながら長期間に亘って空気の出入りを目詰まりすることなく安定的に行わせ、脈圧室にエンジンオイルや液体燃料を溜まらせることのない大気孔を具えさせることを課題とする。   The present invention is intended to solve the above-described problems, and in a pulsating diaphragm fuel pump, air flow is not clogged over a long period of time while reducing the manufacturing cost with a simple configuration. It is an object of the present invention to make the pulse pressure chamber have an air hole that does not accumulate engine oil or liquid fuel in a stable manner.

そこで、本発明は、ポンプ室が形成されたポンプ本体と脈圧室が形成されたダイヤフラムカバー体とがポンプ室と脈圧室とを区画するポンプダイヤフラムを挟み込んで外側周縁部で重ね合わせられている脈動式ダイヤフラム燃料ポンプについて、脈圧室と大気とを連通させる大気孔が中間のクッション室とポンプ外部の大気側からクッション室に至る大気側区間およびクッション室から脈圧室に至る脈圧室側区間とからなるものであって、クッション室と大気側区間とがポンプ本体とダイヤフラムカバー体との重ね合わせ個所に設けた空隙によって形成されたものとした。   Therefore, in the present invention, the pump body in which the pump chamber is formed and the diaphragm cover body in which the pulse pressure chamber is formed are overlapped with each other at the outer peripheral edge with the pump diaphragm partitioning the pump chamber and the pulse pressure chamber interposed therebetween. In the pulsating diaphragm fuel pump, the air hole that connects the pulsation pressure chamber and the atmosphere is an intermediate cushion chamber, the atmosphere side section from the atmosphere outside the pump to the cushion chamber, and the pulsation pressure chamber from the cushion chamber to the pulsation pressure chamber It is composed of a side section, and the cushion chamber and the atmosphere side section are formed by a gap provided at an overlap portion of the pump body and the diaphragm cover body.

このことにより、微細固形物がクッション室に溜まることにより脈圧室側区間に目詰まりが生じない。そのため、長期間に亘り脈圧室への空気の出入りを安定的に行わせることができるようになる。   Thus, clogging does not occur in the pulse pressure chamber side section due to the accumulation of fine solid matter in the cushion chamber. Therefore, the air can be stably made to enter and exit the pulse pressure chamber over a long period of time.

しかも、大気孔のクッション室および大気側区間はポンプ本体とダイヤフラムカバー体との重ね合わせ個所に設けた空隙で形成されるため、フィルタや保護プレートのような専用部品を必要としないばかりか、製造工程を増やすことなく大気孔を容易に設けることができるとともに掃除などのメンテナンスの手間も殆ど要しないものとなる。   Moreover, because the cushion chamber and the atmosphere side section of the air hole are formed by a gap provided in the overlapping part of the pump body and the diaphragm cover body, special parts such as a filter and a protection plate are not required, and it is manufactured. Air holes can be easily provided without increasing the number of processes, and maintenance work such as cleaning is hardly required.

また、大気孔の大気側区間をスリット状とすれば、大気孔のポンプ外部の大気側への開口面積を大きくでき、その間隔を狭くしても充分に大気の流通を確保することができ、クッション室が脈圧室に至る脈圧室側区間を小径孔とすれば脈圧室に導入される脈動圧力への大気の影響を最小限にとどめることができる。   Also, if the atmosphere side section of the air hole is slit-like, the opening area to the atmosphere side outside the pump of the air hole can be increased, and even if the interval is narrowed, the circulation of the air can be sufficiently secured, If the pulse pressure chamber side section where the cushion chamber reaches the pulse pressure chamber is a small-diameter hole, the influence of the atmosphere on the pulsation pressure introduced into the pulse pressure chamber can be minimized.

本発明によると、簡易な構成で部品点数および製造工程の手間を増やさずに製造コストを低廉としながら長期間に亘って空気の出入りを目詰まりすることなく安定的に行わせ、脈圧室にエンジンオイルや液体燃料を溜まらせることのない大気孔を具えさせることができるものである。   According to the present invention, the pulse pressure chamber can be made stable with a simple configuration without increasing the number of parts and the manufacturing process, while keeping the manufacturing cost low and without causing clogging of air for a long period of time. It is possible to provide an air hole that does not accumulate engine oil or liquid fuel.

図面を参照して本発明の実施の形態を説明すると、図1は本実施の形態の脈動式ダイアヤラム燃料ポンプを示すものであって、ポンプ本体1の一方の面に、ポンプダイヤフラム6に覆われてポンプ室4を形成するくぼみを具えるとともに脈圧室5を形成するくぼみを具えたダイヤフラムカバー体3を重ね、ポンプ本体1の他方の面に、パルセータダイヤフラム7a,7bで覆われて吸込室9,吐出室10を形成するくぼみを具えるとともに空気室11a,11bを形成するくぼみを具えたキャップ体2を重ねており、ポンプ室4と吸込室9、吐出室10とを区画するポンプ本体1の仕切壁12には吸込弁13と吐出弁14が設けられている。   An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a pulsating diaphragm fuel pump according to the present embodiment. One side of a pump body 1 is covered with a pump diaphragm 6. A diaphragm cover body 3 having a recess for forming a pump chamber 4 and a recess for forming a pulse pressure chamber 5 is overlapped, and the other surface of the pump body 1 is covered with pulsator diaphragms 7a and 7b and a suction chamber 9. A pump body that has a recess that forms a discharge chamber 10 and a cap body 2 that has a recess that forms air chambers 11a and 11b, and separates the pump chamber 4, the suction chamber 9, and the discharge chamber 10. One partition wall 12 is provided with a suction valve 13 and a discharge valve 14.

本実施の形態における脈動式ダイヤフラム燃料ポンプは、基本的構成および作用については前述した図4に示す従来の脈動式ダイヤフラム燃料ポンプと同様であるのでその詳細な説明は省略し、本発明の特徴部分である大気孔15について以下に詳述する。尚、大気中の微細固形物が脈圧室5に侵入すると流入したエンジンオイルや液体燃料に混入してポンプ動作やエンジン運転の不調の原因となる心配があるので、脈圧室5への侵入防止と大気孔15の詰まり防止とを両立させることは重要である。   The basic configuration and operation of the pulsating diaphragm fuel pump in the present embodiment is the same as that of the conventional pulsating diaphragm fuel pump shown in FIG. 4 described above, and a detailed description thereof will be omitted. The atmospheric hole 15 is described in detail below. If fine solids in the atmosphere enter the pulse pressure chamber 5, they may enter the flowed engine oil or liquid fuel and cause malfunction of the pump operation or engine operation. It is important to achieve both prevention and prevention of clogging of the air holes 15.

図2は図1における矢印X−X方向に見た大気孔15部分の拡大図を示しており、図3の(A)は図2の大気孔15のポンプ本体1からダイヤフラムカバー体3を外した状態を示す分解図であり、図3の(B)は(A)のY―Y線に沿う断面図を示している。   2 shows an enlarged view of the portion of the atmospheric hole 15 as viewed in the direction of the arrow XX in FIG. 1, and FIG. 3A shows that the diaphragm cover 3 is removed from the pump body 1 of the atmospheric hole 15 of FIG. FIG. 3B is a cross-sectional view taken along line YY of FIG. 3A.

図1、図2および図3を参照して、脈動式ダイヤフラム燃料ポンプの左側面において、管状の脈圧導入路16の下方で下向きのくぼみ15fを有するダイヤフラムカバー体3側のケーシング15dと、上向きのくぼみ15gを有するポンプ本体1側のケーシング15eとが向かい合うことによって形成された中空直方体が突出している。そして、大気孔15はその通路中に、クッション室15aと、ポンプ外部の大気側からクッション室15aに至る大気側区間15bと、クッション室15aから脈圧室5に至る脈圧室側区間15cとを具えている。   Referring to FIGS. 1, 2 and 3, on the left side of the pulsating diaphragm fuel pump, a casing 15d on the diaphragm cover body 3 side having a downward depression 15f below the tubular pulsating pressure introduction passage 16, and upward A hollow rectangular parallelepiped formed by facing the casing 15e on the pump body 1 side having the recess 15g protrudes. The atmosphere hole 15 includes a cushion chamber 15a, an atmosphere side section 15b extending from the atmosphere outside the pump to the cushion chamber 15a, and a pulse pressure chamber side section 15c extending from the cushion chamber 15a to the pulse pressure chamber 5 in the passage. It has.

更に詳しくは、クッション室15aはダイヤフラムカバー体側ケーシング15dとポンプ本体側ケーシング15eとが向かい合わせに上下に重ね合わされてそのくぼみ15fとくぼみ15gとが向かい合わせに合致することで形成されている。大気側区間15bはダイヤフラムカバー体3側のケーシング15dの外側面に設けられた切欠15hと、これに対応する形状を有しポンプ本体1側のケーシング15eの外側面上方に突出した壁15iとの嵌め合わせ部分に生じさせた間隙から形成される。そして、クッション室15aは前述した両ケーシング15d,15eにより形成された直方体とほぼ相似形の空間をその内部に形成することで大きな空間を確保しており、大気側区間15bは外観において上方向に突出したる外側に突出されたほぼぼ同形状コ字状部分とその両端の外側方へ延びる部分とからなるスリット状に形成されて開口部面積を大きなものとしている。   More specifically, the cushion chamber 15a is formed by the diaphragm cover body-side casing 15d and the pump body-side casing 15e being vertically stacked so that the recess 15f and the recess 15g coincide with each other. The atmosphere side section 15b is formed by a notch 15h provided on the outer surface of the casing 15d on the diaphragm cover body 3 side, and a wall 15i having a shape corresponding thereto and protruding above the outer surface of the casing 15e on the pump body 1 side. It is formed from a gap formed in the fitting portion. The cushion chamber 15a secures a large space by forming a space substantially similar to the rectangular parallelepiped formed by the two casings 15d and 15e, and the atmosphere side section 15b is upward in appearance. It is formed in the shape of a slit composed of a substantially U-shaped portion that protrudes outward and protrudes outwardly at both ends, thereby increasing the area of the opening.

また、クッション室15aから脈圧室5に連通する脈圧室側通路15cはダイヤフラムカバー体3の側壁に形成された小径孔であり、脈圧室5内へ導入される脈動圧力への大気の影響を最小限としているが、これが大気側からクッション室15aに連通させるスリット状の大気側通路15bの延長線上からずれて設けられ、大気が一旦クッション室15aに溜まるようになっているため、微細固形物が小径の脈圧側通路15cを詰まらせる心配は殆どない。   Further, the pulse pressure chamber side passage 15 c communicating from the cushion chamber 15 a to the pulse pressure chamber 5 is a small diameter hole formed in the side wall of the diaphragm cover body 3, and the atmospheric pressure to the pulsation pressure introduced into the pulse pressure chamber 5 is obtained. Although the influence is minimized, this is provided so as to be shifted from the extended line of the slit-like atmosphere side passage 15b communicating with the cushion chamber 15a from the atmosphere side, and the atmosphere once accumulates in the cushion chamber 15a. There is almost no worry that the solid matter clogs the small-diameter pulse pressure side passage 15c.

図1および図2を参照して本実施の形態の動作を以下に説明する。脈圧導入路16を経由して、図示しないエンジンのクランクケースまたは吸気管からエンジンオイルまたは液体燃料が脈圧室に流入することがある。脈圧導入路16を介して脈圧室5に圧力変動が生じ、負圧になったとき大気孔15を経て大気が脈圧室5に流入し、先の正圧時に導入されたエンジンオイルや液体燃料を連行して脈圧導入路16よりクランクケースや吸気管に流出することにより、これらを脈圧室5に溜めないように働く。   The operation of the present embodiment will be described below with reference to FIGS. Engine oil or liquid fuel may flow into the pulse pressure chamber from a crankcase or an intake pipe of an engine (not shown) via the pulse pressure introduction path 16. When pressure fluctuation occurs in the pulse pressure chamber 5 via the pulse pressure introduction path 16 and the pressure becomes negative, the air flows into the pulse pressure chamber 5 through the air holes 15, and the engine oil introduced at the previous positive pressure or The liquid fuel is entrained and flows out from the pulse pressure introduction passage 16 to the crankcase and the intake pipe, so that they do not accumulate in the pulse pressure chamber 5.

このとき、ポンプ外部の大気は大気側通路15bから流入するが、そのスリット幅よりも大径または同径の微細固形物は通過しない。クッション室15aに入った大気は大気側通路15bのスリット幅よりも小径の微細固形物を含むが、これらはクッション室15aにかなり大量の空気が滞留するためその底部に落下するかもしくはその壁面に付着するようになり、脈圧室側通路15cを詰まらせたり脈圧室5内に侵入したりすることが殆どない。従って、長期間に亘り空気の出入りを安定的に確保して脈圧室5にエンジンオイルや液体燃料が溜まるのを防ぐことができる。   At this time, the atmosphere outside the pump flows from the atmosphere side passage 15b, but fine solids having a diameter larger than or equal to the slit width do not pass through. The atmosphere that has entered the cushion chamber 15a contains fine solids having a diameter smaller than the slit width of the atmosphere-side passage 15b. However, since a large amount of air stays in the cushion chamber 15a, it falls to the bottom or on the wall surface. As a result, the pulse pressure chamber side passage 15c is hardly clogged or penetrates into the pulse pressure chamber 5. Therefore, it is possible to stably secure the air in and out over a long period of time and prevent the engine oil and liquid fuel from accumulating in the pulse pressure chamber 5.

また、スリット状の大気側通路15bを外側面において上向きに突出させたコ字状に形成したことで、その開口面積が大きいものとなるため、スリット幅を小さくしても充分な大気の通過量を確保すると同時に比較的小径の微細固形物も通過させないものとなる。従って、クッション室15aに侵入する微細固形物は、大気側通路15bのスリットを通過する程度の小径ものであってきわめて微量であるため、これがクッション室15a内に溜まって掃除を必要とすることも殆どなく、メンテナンスが容易である。   In addition, since the slit-shaped atmosphere-side passage 15b is formed in a U-shape projecting upward on the outer surface, the opening area becomes large, so that a sufficient amount of air can pass even if the slit width is reduced. At the same time, a relatively small fine solid material is not allowed to pass through. Accordingly, the fine solid matter that enters the cushion chamber 15a has a small diameter that passes through the slit of the atmosphere-side passage 15b and is extremely small, so that it may accumulate in the cushion chamber 15a and require cleaning. There is almost no maintenance.

さらに、この大気孔15はポンプ本体1とダイヤフラムカバー体3との重ね合わせ部分においてクッション室15aと大気側通路15bとを形成したものとなっており、構成部分がポンプ本体1およびダイヤフラムカバー体3の一部で形成されるため部品点数が増加しないとともに、ポンプダイヤフラム6を挟んでこれらを重ねるだけで組み立てられるため、製造の手間を要さず製造コストが低廉でもる。   Further, the air hole 15 forms a cushion chamber 15a and an air passage 15b in the overlapping portion of the pump body 1 and the diaphragm cover body 3, and the constituent parts are the pump body 1 and the diaphragm cover body 3. Therefore, the number of components does not increase, and the assembly is performed by simply stacking the pump diaphragm 6 therebetween, so that the manufacturing cost is not required and the manufacturing cost is low.

本発明の実施の形態を示す縦断面図。The longitudinal cross-sectional view which shows embodiment of this invention. 図1の矢印X−X方向に見た拡大側面部分図。FIG. 3 is an enlarged side partial view as seen in the direction of arrow XX in FIG. 1. (A)は図2の大気孔の分解図、(B)はそのY―Y線に沿う断面図。(A) is an exploded view of the atmospheric hole of FIG. 2, (B) is a sectional view along the YY line. 従来例を示す縦断面図。The longitudinal cross-sectional view which shows a prior art example. (A)は従来の大気孔の縦断面図、(B)は従来の異なる大気孔の縦断面図。(A) is a longitudinal cross-sectional view of a conventional atmospheric hole, (B) is a vertical cross-sectional view of a different conventional air hole.

符号の説明Explanation of symbols

1 ポンプ本体、3 ダイヤフラムカバー体、4 ポンプ室、5 脈圧室、6 ポンプダイヤフラム、9 吸込室、10 吐出室、12 仕切壁、13 吸込弁、14 吐出弁、15 大気孔、15a クッション室、15b 大気側通路、15c 脈圧室側通路、15d ダイヤフラムカバー体側ケーシング、15e ポンプ本体側ケーシング、15f,15g くぼみ、15h 切欠、15i 壁
DESCRIPTION OF SYMBOLS 1 Pump main body, 3 Diaphragm cover body, 4 Pump chamber, 5 Pulse pressure chamber, 6 Pump diaphragm, 9 Suction chamber, 10 Discharge chamber, 12 Partition wall, 13 Suction valve, 14 Discharge valve, 15 Air hole, 15a Cushion chamber, 15b Atmosphere side passage, 15c Pulse pressure chamber side passage, 15d Diaphragm cover body casing, 15e Pump body side casing, 15f, 15g hollow, 15h notch, 15i wall

Claims (2)

ポンプ室が形成されたポンプ本体と脈圧室が形成されたダイヤフラムカバー体とが前記ポンプ室と脈圧室とを区画するポンプダイヤフラムを挟み込んで外側周縁部で重ね合わせられている脈動式ダイヤフラム燃料ポンプにおいて、
前記脈圧室と大気とを連通させる大気孔が中間のクッション室とポンプ外部の大気側から前記クッション室に至る大気側区間および前記クッション室から脈圧室に至る脈圧室側区間とからなるものであって、
前記クッション室と大気側区間とが前記ポンプ本体とダイヤフラムカバー体との重ね合わせ個所に設けた空隙によって形成されている、
ことを特徴とする脈動式ダイヤフラム燃料ポンプ。
A pulsating diaphragm fuel in which a pump main body in which a pump chamber is formed and a diaphragm cover body in which a pulse pressure chamber is formed are overlapped at an outer peripheral edge sandwiching a pump diaphragm that partitions the pump chamber and the pulse pressure chamber In the pump,
An air hole for communicating the pulse pressure chamber with the atmosphere includes an intermediate cushion chamber, an atmosphere side section extending from the atmosphere side outside the pump to the cushion chamber, and a pulse pressure chamber side section extending from the cushion chamber to the pulse pressure chamber. And
The cushion chamber and the atmosphere side section are formed by a gap provided at an overlap portion between the pump body and the diaphragm cover body,
A pulsating diaphragm fuel pump characterized by that.
前記大気側区間がスリット状とされ、前記脈圧室側区間が小径孔とされている請求項1に記載の脈動式ダイヤフラム燃料ポンプ。
2. The pulsating diaphragm fuel pump according to claim 1, wherein the atmosphere side section has a slit shape, and the pulse pressure chamber side section has a small diameter hole.
JP2003344054A 2003-10-02 2003-10-02 Pulsating diaphragm fuel pump Expired - Fee Related JP4320721B2 (en)

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Cited By (5)

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WO2010023876A1 (en) * 2008-08-26 2010-03-04 パナソニック株式会社 Fluid transport using conductive polymer
JP2010090846A (en) * 2008-10-09 2010-04-22 Honda Motor Co Ltd Diaphragm fuel pump for engine
CN101994603A (en) * 2009-08-26 2011-03-30 现代自动车株式会社 Fuel supplying system of LPI engine
US20120204840A1 (en) * 2011-02-14 2012-08-16 Makita Corporation Engine
CN112302915A (en) * 2020-10-27 2021-02-02 浙江大学 Bellows pump with built-in damper

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Publication number Priority date Publication date Assignee Title
CN102817818A (en) * 2012-08-30 2012-12-12 清华大学 Electrolysis micropump for double-fluid synchronous transmission

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010023876A1 (en) * 2008-08-26 2010-03-04 パナソニック株式会社 Fluid transport using conductive polymer
CN102016314A (en) * 2008-08-26 2011-04-13 松下电器产业株式会社 Fluid transport using conductive polymer
US8449273B2 (en) 2008-08-26 2013-05-28 Panasonic Corporation Fluid transporting device using conductive polymer
JP2010090846A (en) * 2008-10-09 2010-04-22 Honda Motor Co Ltd Diaphragm fuel pump for engine
CN101994603A (en) * 2009-08-26 2011-03-30 现代自动车株式会社 Fuel supplying system of LPI engine
US20120204840A1 (en) * 2011-02-14 2012-08-16 Makita Corporation Engine
US9410513B2 (en) * 2011-02-14 2016-08-09 Makita Corporation Engine configured to drive a diaphragm fuel pump using pressure fluctuation in a crank chamber of the engine
CN112302915A (en) * 2020-10-27 2021-02-02 浙江大学 Bellows pump with built-in damper
CN112302915B (en) * 2020-10-27 2021-08-31 浙江大学 Bellows pump with built-in damper

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