JP2004169748A - Check valve - Google Patents

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Publication number
JP2004169748A
JP2004169748A JP2002333362A JP2002333362A JP2004169748A JP 2004169748 A JP2004169748 A JP 2004169748A JP 2002333362 A JP2002333362 A JP 2002333362A JP 2002333362 A JP2002333362 A JP 2002333362A JP 2004169748 A JP2004169748 A JP 2004169748A
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Japan
Prior art keywords
diaphragm
check valve
center
movable portion
valve
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JP2002333362A
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Japanese (ja)
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JP4150244B2 (en
Inventor
Goro Kakizawa
五郎 柿澤
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Oken Seiko Co Ltd
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Oken Seiko Co Ltd
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Priority to JP2002333362A priority Critical patent/JP4150244B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To supply a necessary amount of fluid while reducing noise. <P>SOLUTION: A check valve 50 installed to an installation hole 47 of a partition wall 40 has a movable part 52 for opening/closing an intake hole 48. The movable part 52 is formed at an end of an installation part 51 in a shape of a disc expanding in a direction approximately perpendicular to an axial direction of the installation part 51 around the installation part 51 as a center. A plurality of ribs 55 radially extending on a face opposite to a face in contact with the partition wall 40 of the movable part 52 are equiangularly disposed in a circumferential direction. The movable part 52 becomes thinner from the center part toward the tip, and the ribs 55 become thicker from the center part toward the tip. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、血圧計等に組み込まれる小型エアポンプに用いられる逆止め弁に関し、特に傘形状に形成された逆止め弁に関する。
【0002】
【従来の技術】
この種の逆止め弁においては、隔壁の吸気孔を開閉する可動部に、流体によって開く方向の力と閉じる方向の力とが作用し、これらの相反する力によって可動部の先端部が振動し、この振動によって可動部の先端が隔壁の表面を繰り返し叩くために騒音が発生していた。これを防止するために、従来の弁体は円板状に形成した可動部の周端縁の全周に亘ってリブを設け、このリブによって可動部の先端部の剛性を高くして、騒音の原因となる振動の発生を低減するものがある。
【0003】
なお、本出願には、本明細書に記載した先行技術文献情報で特定される先行技術文献以外には、本発明に密接に関連する先行技術文献を出願時までに発見するには至らなかった。
【0004】
【特許文献1】
特開平11−218244号公報(段落0014、図1)
【0005】
【発明が解決しようとする課題】
しかしながら、上述した従来の逆止め弁においては、リブを可動部の周端縁の全周に亘って設けた構造としているために、このリブによって可動部の先端部の剛性が高くなり過ぎてしまい、弁体が所定量開かなくなるために種々の問題が発生していた。すなわち、図6は従来の逆止め弁の動作状態を説明するために、逆止め弁の円周方向を展開し拡大して示したモデル断面図である。同図において、従来の逆止め弁72の周端縁においては、周端縁の厚みt1が逆止め弁72の円周方向(図中、矢印B方向)の全周に亘って厚く形成されているために、周縁部の剛性が高くなりすぎてしまう。したがって、隔壁70に形成した通気孔71から流出する流体によって図中矢印A方向に弾性変形する逆止め弁72の弾性変形量W3が相対的に少ない。このため、隔壁70と周縁部との間の隙間が狭いために、この狭い隙間を通過する流体の量S2も少なくなり、必要な量の流体が通過できないという問題があった。また、リブを可動部の周端縁の全周に亘って設けた構造としているために、弁体が閉じるときに可動部の周端縁の全周が同時に隔壁に当接する。このため当接音が大きくなり、結果的に大きな騒音の原因になっていた。
【0006】
本発明は上記した従来の問題に鑑みなされたものであり、その目的は騒音を低減できたうえで必要な量の流体を通過させることにある。
【0007】
【課題を解決するための手段】
この目的を達成するために、試行錯誤の結果、次の構成により上記目的を達成することができた。すなわち、請求項1に係る発明は、軸状に形成された取付部と、この取付部の一端に取付部を中心として取付部の軸線方向と略直交する方向に拡がりを有する円板状に形成された可動部とによって形成され、前記取付部が隔壁に取り付けられ前記可動部が隔壁に形成した流体の通る貫通孔を開閉する逆止め弁において、前記可動部の隔壁に対接する面と反対側の面に放射状に伸びるリブを複数設けたものである。
したがって、リブによって可動部の先端部の剛性は、円周方向において部分的に高くなる。
【0008】
また、請求項2に係る発明は、請求項1に係る発明において、前記可動部の厚みを中心部から先端に向かって薄く形成し、前記リブの厚みを中心部から先端に向かって厚く形成した
したがって、リブによって可動部の先端部の剛性の低下を補うことができる。
【0009】
【発明の実施の形態】
以下、本発明の実施の形態を図に基づいて説明する。図1は本発明に係る逆止め弁を使用したダイヤフラムポンプの断面図、図2は同じくダイヤフラムを示し、同図(a)は平面図、同図(b)は同図(a)におけるII(b)−II(b) 線断面図である。図3は同じくバルブホルダーを示し、同図(a)は平面図、同図(b)は同図(a)におけるIII(b)−III(b) 線断面図、同図(c)は底面図である。図4(a)は本発明に係る逆止め弁を隔壁に取り付けた状態を拡大して示した断面図、同図(b)は逆止め弁の底面図、図5は同じく逆止め弁の動作状態を説明するために、逆止め弁の円周方向を展開し拡大して示したモデル断面図である。
なお、明細書中において方向を説明するために使用した「上、下」は、あくまでも図中における方向を説明した便宜上のものであって、本発明に係るダイヤフラムポンプが実際に使用される際の上、下の方向とは必ずしも一致するものではない。
【0010】
図1において、全体を符号1で示すダイヤフラムポンプは、駆動源であるモータ2を備えており、このモータ2はモータ軸3がケース4内に臨むようにケース4の底部にねじによって固定されている。ケース4はプラスチックによって上方が開口した有底円筒状に形成されている。
【0011】
5は略小円柱状に形成されたクランク台であって、底面の略中央にはモータ軸3が固着される軸孔6が設けられており、また、この軸孔6の軸線から偏心した位置には、駆動軸7が傾斜した状態で固着されている。
【0012】
10はプラスッチックによって形成された駆動体であって、ボス11と、このボス11の上端に一体に形成された本体12とによって形成され、ボス11には、前記駆動軸7が回転自在に挿入される軸孔13が設けられている。したがって、この駆動体10の軸孔13にボール14とともに駆動軸7を挿入することにより、駆動軸7に駆動体10が回転自在に支持される。本体12は、平面視において中心から円周方向に等角度ずつ位相をずらして放射状に延設された3つの駆動子15によって一体に形成され、これら3つの駆動子15は、中心から先端に向かっていずれも同じ角度だけ下方に傾斜しており、各駆動子15の先端側には、後述する各ダイヤフラム部を取り付けるための取付孔16が設けられている。
【0013】
20はプラスチックによって形成されたダイヤフラムホルダーであって、下方が開口したカップ状に形成されており、天井部21の外周部には3つのダイヤフラム部挿入孔22が、平面視において円周方向に等角度ずつ位相をずらして設けられている。
【0014】
25はゴム等の柔軟性を有する材料によって形成されたダイヤフラムであって、図2(a)に示すように、平面視において円周方向に等角度ずつ位相をずらして設けられた3つのダイヤフラム部26と、これら3つのダイヤフラム部26の上端部を連設する略円板状に形成されたフランジ27とによって一体に形成されている。フランジ27の中央部の3つのダイヤフラム部26に囲まれた部位には、円筒状に形成された第2の弁体32が立設されている。この第2の弁体32の内周面であって、3つのダイヤフラム部26に対応した部位には、上下方向に延在するリブ33が突設されている。
【0015】
また、第2の弁体32の3つのリブ33の間に位置する部位には、上下方向に延在する切欠き34が設けられている。したがって、これら3つの切欠き34によって第2の弁体32は三分の一円周状からなる3つの舌片32a,32b,32cに分割されており、これら舌片32a,32b,32cは各ダイヤフラム部26のそれぞれに対応する位置に位置付けられている。各ダイヤフラム部26の下面には、同図(b)に示すように、断面が略円錐台状のピストン28が一体に形成され、このピストン28の下面には、細径の首部29を有する係止用の凸部30が一体に形成されている。
【0016】
このような構成において、ダイヤフラム25の各ダイヤフラム部26を、図1に示すように、ダイヤフラムホルダー20のダイヤフラム部取付孔22に挿入し、フランジ27をダイヤフラムホルダー20の天井部21上に載置する。次いで、各ダイヤフラム部26の係止用の凸部30を弾性変形させながら、駆動体11の各取付孔16に圧入し首部29を取付孔16に係止させることにより、各ダイヤフラム部26を駆動体10の各駆動子15に取り付ける。しかる後、駆動体10の軸孔13にボール14および駆動軸7を挿入し、ダイヤフラムホルダー20をケース4上に載置する。
【0017】
40はプラスチックによって略円板状に形成された隔壁としてのバルブホルダーであって、図3(a)、(b)に示すように、上面に凹部41が設けられており、この凹部41の中央には円柱状に形成されたボス42が設けられている。このボス42の中心部には、上記したダイヤフラム25の第2の弁体32が嵌合する中空部43が設けられており、この中空部43の内周面の下部には、同図(b)、(c)に示すように、対をなす溝44が円周方向に互いに等角度おいて3組設けられている。
【0018】
ボス42の上面には、筒部45が一体に設けられており、この筒部45の上端開口は中空部43に連通する吐出口46を形成している。ボス42の周りには、後述する第1の弁体50を取り付ける取付孔47が円周方向に等角度おいて3つ設けられており、各取付応47の周りには、6個の吸気孔48が円周方向に等角度おいて設けられている。3つの取付孔47は、3組の溝44に対応した位置に位置付けられている。49はケース4にダイヤフラムホルダー20およびバルブホルダー40を固定するための通しねじを挿通させる挿通孔である。
【0019】
図1において、本発明の特徴である第1の弁体50は、全体がゴム等の柔軟性を有する材料によって形成されており、図4(a)に示すように、軸状に形成された取付部51と、この取付部51の一端に取付部51を中心として取付部51の軸線方向と略直交する方向に拡がりを有する円板状に形成された可動部52とによって一体に形成されている。取付部51の略中央には係止用の凸部53が設けられている。
【0020】
可動部52の裏面中央部と取付部51の一端との間には扁平な取付台54が一体に形成されている。可動部52は中心部から先端に向かって漸次厚みが薄く形成され、裏面52aは、中央が下方に向かって凹面をなすように形成されている。可動部52の表面には、同図(b)に示すように、放射状に伸びる9本のリブ55が円周方向に等角度おいて設けられている。このリブ55は、同図(a)に示すように、中心部から先端に向かって、漸次厚みが厚く形成されており、先端の厚みtが可動部52の先端の厚みtと略同じ厚さに形成されている。
【0021】
この第1の弁体50は、係止用の凸部53を弾性変形させながら、バルブホルダー40の各取付孔47に圧入し取付孔47の開口縁に係止させることにより、可動部52が6つの吸気孔48を覆うように各取付孔47に取り付けられる。このように取り付けられた第1の弁体50は、後述するポンプ室57と吸気孔48との間を閉塞するように、可動部52の裏面52aがバルブホルダー40の表面に対接する。したがって、この第1の弁体50とバルブホルダー40の表面とが、後述するポンプ室57から吸気孔48へ流体が流れるの阻止する逆止め弁を構成する。また、上記した第2の弁体32は、吐出口46とポンプ室57との間を閉塞するように、中空部43の壁面に密接する。したがって、この第2の弁体32と中空部43の壁面とが、吐出口46からポンプ室57への流体の流れを阻止する逆止め弁を構成する。
【0022】
このように第1の弁体50が組み付けられたバルブホルダー40は、図1に示すように、ダイヤフラムホルダー20に載置され、ダイヤフラム25がダイヤフラムホルダー20とバルブホルダー40とによって挟持されることにより、各ダイヤフラム部26とバルブホルダー40との間に3つのポンプ室57が形成される。これらバルブホルダー40とダイヤフラムホルダー20とは、図示を省略した通しねじによってケース4に固定される。
【0023】
図1において、60はプラスチックによって下方が開口しカップ状に形成された吸気ハウジングであって、天井部の中央には、バルブホルダー40の筒部45の基部が嵌合する嵌合口61が設けられており、天井部の外周部には筒部62が立設され、この筒部62の上端開口は、後述する吸気空間65に連通されて吸気口63を形成している。
【0024】
次に、図1を用いて、このような構造のダイヤフラムポンプ1の動作について説明する。
モータ2が駆動しモータ軸3が回転すると、クランク台6も一体に回転し、このクランク台6の軸孔6の軸線から偏心した位置に傾斜した状態で固着された駆動軸7が、モータ軸3の周りを傾斜方向を変えるようにして偏心回転する。したがって、この駆動軸7に回動自在に支持された駆動体10の各駆動子15が順次上下に揺動し、ダイヤフラム25の各ダイヤフラム部26も順次上下に揺動するので、各ポンプ室57は順次拡縮しポンプ作用を行う。
【0025】
ダイヤフラム25の3つのダイヤフラム部26のうちの一つが下降すると、そのポンプ室57は拡張するので、ポンプ室57が負圧状態になる。このとき、第2の弁体32は、流体が吐出口46からポンプ室57への流れを規制する逆止め弁として機能するから、この第2の弁体32によって吐出口46とポンプ室57との間が閉じられる。一方、第1の弁体50は吸気孔48とポンプ室57との間を開放するので、蓋体60の通気口63から吸気空間65内に流入した流体は吸気孔48から拡張したポンプ室57内に流入する。
【0026】
同時に、拡張していた他のポンプ室57のダイヤフラム部26が上昇するので、ポンプ室57は収縮してポンプ室57内の流体の圧力が上昇する。このとき、第1の弁体50は、流体がポンプ室57から吸気孔48への流れを阻止する逆止め弁として機能するから、この第1の弁体50によってポンプ室57と吸気孔48との間が閉塞される。一方、第2の弁体32の舌片32aはポンプ室57と吐出口46との間を開放するので、ポンプ室57内の流体は中空部43の溝44を通って中空部43へ圧送されて吐出口46から吐出される。このポンプ室57の拡縮動作は、各ポンプ室57において順次連続して行われるで、流体は吐出口60から連続して吐出される。
【0027】
次に、図5を用いて、吸気孔48からポンプ室57に流体が通過するときの第1の弁体50の動作を説明する。
ポンプ室57が拡張しポンプ室57が負圧状態になることにより、吸気孔48を通ってポンプ室57に供給される流体は、第1の弁体50の可動部52をダイヤフラム40の表面から離間させるように図中矢印A方向に弾性変形させる。このとき、可動部52のリブ55の円周方向の幅L1が、互いに隣接するリブ55間の間隔L2よりも小さく形成されていることにより、リブ55によって可動部52の円周方向(図中、矢印B方向)における剛性が部分的にのみ高くなっている。このため、第1の弁体50が閉じるときに、可動部52の周端縁の全周が同時にバルブホルダー40に当接するのではなく、時間的に分散するようにして当接する。このため当接音が大きくなることはなく、当接によって発生する騒音の音量が小さくなり、結果的に騒音が低減される。
【0028】
また、流体の通過する流路の幅、すなわち、バルブホルダー40と可動部52との間の隙間が狭くならないから、可動部52とバルブホルダー40との間を通過する流体の量S1も少なくならないために、所要量の流体をポンプ室57に供給することもできる。
【0029】
また、リブ55を可動部52の円周方向に等角度おいて設けたことにより、可動部52の円周方向における弾性変形の量が均一になるため、ポンプ室57内への流体の流れが円滑に行われる。また、可動部52は中心部から先端に向かって漸次厚みが薄く形成されていることにより、可動部52の弾性変形の量が充分に得られるため、ポンプ室57への流体の必要な供給量が得られる。また、リブ55が中心部から先端に向かって、漸次厚みが厚く形成されていることにより、可動部52の最も剛性の低い先端部の剛性を補うことができるので、振動が起きやすい先端部の振動を低減できる。
【0030】
なお、リブの本数を9本としたが、これに限定されるものではなく、吸気孔48の数量とも関係するが3〜12本が望ましい。また、本発明の第1の弁体50をダイヤフラムポンプに使用した例を説明したが、これに限定されず各種の装置の逆止め弁として使用できる。
【0031】
【発明の効果】
以上説明したように本発明によれば、振動に起因する騒音を低減できるばかりではなく、所要量の流体を通過させることもできる。
【0032】
また、請求項2に係る発明によれば、最も振動が起きやすい先端部の振動を低減できるため騒音を確実に低減できる。
【図面の簡単な説明】
【図1】本発明に係る逆止め弁を使用したダイヤフラムポンプの断面図である。
【図2】本発明に係る逆止め弁を使用したダイヤフラムポンプにおけるダイヤフラムを示し、同図(a)は平面図、同図(b)は同図(a)におけるII(b)−II(b) 線断面図である。
【図3】本発明に係る逆止め弁を使用したダイヤフラムポンプにおけるバルブホルダーを示し、同図(a)は平面図、同図(b)は同図(a)におけるIII(b)−III(b) 線断面図、同図(c)は底面図である。
【図4】同図(a)は本発明に係る逆止め弁を隔壁に取り付けた状態を拡大して示した断面図、同図(b)は逆止め弁の底面図である。
【図5】本発明に係る逆止め弁の動作状態を説明するために、逆止め弁の円周方向を展開し拡大して示したモデル断面図である。
【図6】従来の逆止め弁の動作状態を説明するために、逆止め弁の円周方向を展開し拡大して示したモデル断面図である。
【符号の説明】
1…、ダイヤフラムポンプ、2…モータ、5…クランク台、7…駆動軸、10…駆動体、20…ダイヤフラムホルダー、25…ダイヤフラム、26…ダイヤフラム部、32…第2の弁体、32a、32b、32c…舌片、40…バルブホルダー(隔壁)、43…中空部、46…吐出口、47…取付孔、48…吸気孔、50…第1の弁体(逆止め弁)、51…取付部、52…可動部、55…リブ、57…ポンプ室、60…吸気ハウジング、63…通気口、65…吸気空間。
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a non-return valve used for a small air pump incorporated in a sphygmomanometer or the like, and more particularly to a non-return valve formed in an umbrella shape.
[0002]
[Prior art]
In this type of check valve, a force in the direction of opening and a force in the direction of closing act on the movable portion that opens and closes the intake hole of the partition wall, and the tip of the movable portion vibrates due to these opposing forces. However, noise was generated because the tip of the movable portion repeatedly hit the surface of the partition wall due to this vibration. In order to prevent this, the conventional valve element is provided with ribs over the entire peripheral edge of the movable portion formed in a disk shape, and the ribs increase the rigidity of the distal end portion of the movable portion to reduce noise. There is a device that reduces the occurrence of vibration that causes the vibration.
[0003]
Note that, in the present application, other than the prior art documents specified by the prior art document information described in the present specification, no prior art documents closely related to the present invention could be found by the time of filing. .
[0004]
[Patent Document 1]
JP-A-11-218244 (paragraph 0014, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional check valve, since the ribs are provided over the entire periphery of the peripheral edge of the movable portion, the rigidity of the distal end portion of the movable portion becomes excessively high due to the ribs. However, various problems have occurred because the valve body cannot be opened by a predetermined amount. That is, FIG. 6 is a model cross-sectional view in which the circumferential direction of the check valve is developed and enlarged in order to explain the operation state of the conventional check valve. In the figure, at the peripheral edge of the conventional check valve 72, the thickness t1 of the peripheral edge is formed to be thick over the entire circumference of the check valve 72 in the circumferential direction (the direction of arrow B in the figure). Therefore, the rigidity of the peripheral portion becomes too high. Therefore, the amount of elastic deformation W3 of the check valve 72, which is elastically deformed in the direction of arrow A in the figure by the fluid flowing out from the ventilation hole 71 formed in the partition wall 70, is relatively small. For this reason, since the gap between the partition wall 70 and the peripheral portion is narrow, the amount S2 of the fluid passing through the narrow gap is reduced, and there is a problem that a necessary amount of fluid cannot be passed. Further, since the ribs are provided over the entire periphery of the peripheral edge of the movable portion, the entire periphery of the peripheral edge of the movable portion simultaneously contacts the partition wall when the valve element is closed. For this reason, the contact sound becomes loud, resulting in a loud noise.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has as its object to allow a required amount of fluid to pass while reducing noise.
[0007]
[Means for Solving the Problems]
To achieve this object, as a result of trial and error, the above object was achieved by the following configuration. That is, the invention according to claim 1 forms the mounting portion formed in the shape of a shaft, and a disk-like shape having an extension at one end of the mounting portion in a direction substantially perpendicular to the axial direction of the mounting portion with the mounting portion as the center. The movable part is formed by the movable part, the mounting part is attached to the partition and the movable part opens and closes a through hole through which the fluid formed in the partition opens and closes. Are provided with a plurality of radially extending ribs.
Therefore, the rigidity of the distal end portion of the movable portion is partially increased in the circumferential direction by the rib.
[0008]
In the invention according to claim 2, in the invention according to claim 1, the thickness of the movable portion is formed thinner from the center to the tip, and the thickness of the rib is formed thicker from the center to the tip. Therefore, the lowering of the rigidity of the distal end portion of the movable portion can be compensated for by the rib.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a diaphragm pump using a check valve according to the present invention, FIG. 2 shows a diaphragm similarly, FIG. 1 (a) is a plan view, and FIG. 2 (b) is II () in FIG. FIG. 2 is a sectional view taken along line b) -II (b). 3 (a) is a plan view, FIG. 3 (b) is a sectional view taken along line III (b) -III (b) in FIG. 3 (a), and FIG. 3 (c) is a bottom view. FIG. FIG. 4A is an enlarged sectional view showing a state in which the check valve according to the present invention is attached to a partition, FIG. 4B is a bottom view of the check valve, and FIG. FIG. 4 is a model cross-sectional view showing a state in which a circumferential direction of a check valve is developed and enlarged in order to explain a state.
Note that `` up, down '' used to describe the direction in the specification is merely for convenience of describing the direction in the figure, and is used when the diaphragm pump according to the present invention is actually used. The upper and lower directions do not always match.
[0010]
In FIG. 1, a diaphragm pump indicated by reference numeral 1 is provided with a motor 2 as a driving source. The motor 2 is fixed to a bottom of the case 4 by screws so that a motor shaft 3 faces the inside of the case 4. I have. The case 4 is formed in a cylindrical shape with a bottom and an open top made of plastic.
[0011]
Reference numeral 5 denotes a crankshaft formed in a substantially small cylindrical shape. A shaft hole 6 to which the motor shaft 3 is fixed is provided substantially in the center of the bottom surface, and a position eccentric from the axis of the shaft hole 6 is provided. , The drive shaft 7 is fixed in an inclined state.
[0012]
Reference numeral 10 denotes a driving body formed by plastic, which is formed by a boss 11 and a main body 12 integrally formed on the upper end of the boss 11, and the driving shaft 7 is rotatably inserted into the boss 11. A shaft hole 13 is provided. Accordingly, by inserting the drive shaft 7 together with the ball 14 into the shaft hole 13 of the drive body 10, the drive body 10 is rotatably supported by the drive shaft 7. The main body 12 is integrally formed by three drivers 15 radially extended from the center in the circumferential direction with a phase shift in the circumferential direction from the center in plan view, and these three drivers 15 move from the center toward the tip. Each of them is inclined downward by the same angle, and a mounting hole 16 for mounting each diaphragm section described later is provided at the tip end side of each driver 15.
[0013]
Reference numeral 20 denotes a diaphragm holder made of plastic, which is formed in a cup shape with an opening at the bottom, and three diaphragm insertion holes 22 are formed in the outer periphery of the ceiling 21 in the circumferential direction in plan view. The phase is shifted by an angle.
[0014]
Reference numeral 25 denotes a diaphragm formed of a flexible material such as rubber, as shown in FIG. 2 (a), three diaphragm portions provided at equal circumferentially shifted phases in a circumferential direction in plan view. 26, and a substantially disk-shaped flange 27 that connects the upper ends of these three diaphragm portions 26 to each other. A second valve body 32 formed in a cylindrical shape is erected at a central portion of the flange 27 surrounded by the three diaphragm portions 26. On the inner peripheral surface of the second valve body 32, corresponding to the three diaphragm portions 26, ribs 33 extending in the up-down direction are provided in a protruding manner.
[0015]
A notch 34 extending in the up-down direction is provided at a position between the three ribs 33 of the second valve body 32. Therefore, the second valve element 32 is divided into three tongue pieces 32a, 32b, and 32c each having a one-third circumference by these three notches 34. Each of the tongue pieces 32a, 32b, and 32c is It is positioned at a position corresponding to each of the diaphragm portions 26. As shown in FIG. 2B, a piston 28 having a substantially frustoconical cross section is integrally formed on the lower surface of each diaphragm portion 26, and the lower surface of the piston 28 has a neck portion 29 having a small diameter. The stopping projection 30 is formed integrally.
[0016]
In such a configuration, as shown in FIG. 1, each of the diaphragm portions 26 of the diaphragm 25 is inserted into the diaphragm portion mounting hole 22 of the diaphragm holder 20, and the flange 27 is placed on the ceiling 21 of the diaphragm holder 20. . Then, while elastically deforming the locking projections 30 of each of the diaphragm portions 26, each of the diaphragm portions 26 is driven by press-fitting into each of the mounting holes 16 of the driving body 11 and locking the neck portion 29 into the mounting hole 16. It is attached to each driver 15 of the body 10. Thereafter, the ball 14 and the driving shaft 7 are inserted into the shaft hole 13 of the driving body 10, and the diaphragm holder 20 is placed on the case 4.
[0017]
Numeral 40 denotes a valve holder as a partition formed in a substantially disc shape from plastic, and as shown in FIGS. 3A and 3B, a concave portion 41 is provided on the upper surface, and the center of the concave portion 41 is provided. Is provided with a boss 42 formed in a columnar shape. At the center of the boss 42, there is provided a hollow portion 43 in which the second valve body 32 of the diaphragm 25 is fitted. 3), three pairs of grooves 44 are provided at equal angles in the circumferential direction.
[0018]
A cylindrical portion 45 is integrally provided on the upper surface of the boss 42, and an upper end opening of the cylindrical portion 45 forms a discharge port 46 communicating with the hollow portion 43. Around the boss 42, three mounting holes 47 for mounting a first valve body 50 described later are provided at equal angles in the circumferential direction, and around each mounting hole 47, six suction holes are provided. 48 are provided at equal angles in the circumferential direction. The three mounting holes 47 are located at positions corresponding to the three sets of grooves 44. Reference numeral 49 denotes an insertion hole through which a screw for fixing the diaphragm holder 20 and the valve holder 40 to the case 4 is inserted.
[0019]
In FIG. 1, the first valve body 50, which is a feature of the present invention, is entirely formed of a flexible material such as rubber, and has a shaft shape as shown in FIG. An attachment part 51 and one end of the attachment part 51 are integrally formed by a movable part 52 formed in a disk shape having an extension in a direction substantially orthogonal to the axial direction of the attachment part 51 around the attachment part 51. I have. At the approximate center of the mounting portion 51, a projection 53 for locking is provided.
[0020]
A flat mounting base 54 is integrally formed between the center of the rear surface of the movable part 52 and one end of the mounting part 51. The movable portion 52 is formed so as to gradually decrease in thickness from the center to the tip, and the back surface 52a is formed so that the center thereof is concave downward. On the surface of the movable portion 52, nine ribs 55 extending radially are provided at equal angles in the circumferential direction, as shown in FIG. As shown in FIG. 4A, the thickness of the rib 55 is gradually increased from the center to the tip, and the thickness t at the tip is substantially the same as the thickness t at the tip of the movable portion 52. Is formed.
[0021]
The first valve element 50 press-fits into each of the mounting holes 47 of the valve holder 40 and locks the movable portion 52 with the opening edge of the mounting hole 47 while elastically deforming the locking projection 53. It is attached to each attachment hole 47 so as to cover the six intake holes 48. The back surface 52a of the movable portion 52 is in contact with the front surface of the valve holder 40 so that the first valve body 50 attached in this manner closes a space between a pump chamber 57 and an intake hole 48 described later. Therefore, the first valve body 50 and the surface of the valve holder 40 constitute a check valve that prevents fluid from flowing from the pump chamber 57 to the suction hole 48 described later. Further, the above-described second valve body 32 is in close contact with the wall surface of the hollow portion 43 so as to close the gap between the discharge port 46 and the pump chamber 57. Therefore, the second valve body 32 and the wall surface of the hollow portion 43 constitute a check valve that prevents the flow of the fluid from the discharge port 46 to the pump chamber 57.
[0022]
The valve holder 40 to which the first valve body 50 is assembled is placed on the diaphragm holder 20 as shown in FIG. 1, and the diaphragm 25 is clamped between the diaphragm holder 20 and the valve holder 40. Three pump chambers 57 are formed between each of the diaphragm portions 26 and the valve holder 40. The valve holder 40 and the diaphragm holder 20 are fixed to the case 4 by through screws (not shown).
[0023]
In FIG. 1, reference numeral 60 denotes an intake housing formed in a cup shape with its lower part opened by plastic, and a fitting opening 61 is provided at the center of the ceiling to fit the base of the cylindrical portion 45 of the valve holder 40. A cylindrical portion 62 is provided upright on an outer peripheral portion of the ceiling portion, and an upper end opening of the cylindrical portion 62 communicates with an intake space 65 described later to form an intake port 63.
[0024]
Next, the operation of the diaphragm pump 1 having such a structure will be described with reference to FIG.
When the motor 2 is driven and the motor shaft 3 rotates, the crankshaft 6 also rotates integrally, and a drive shaft 7 that is fixed at a position eccentric from the axis of the shaft hole 6 of the crankcase 6 is fixed to the motor shaft. 3 is eccentrically rotated so as to change the inclination direction. Accordingly, each driver 15 of the driving body 10 rotatably supported by the drive shaft 7 sequentially swings up and down, and each diaphragm portion 26 of the diaphragm 25 also swings up and down sequentially. Sequentially expand and contract to perform a pump action.
[0025]
When one of the three diaphragm portions 26 of the diaphragm 25 descends, the pump chamber 57 expands, so that the pump chamber 57 is in a negative pressure state. At this time, since the second valve body 32 functions as a check valve that regulates the flow of the fluid from the discharge port 46 to the pump chamber 57, the discharge port 46 and the pump chamber 57 are formed by the second valve body 32. Is closed. On the other hand, the first valve body 50 opens the space between the suction hole 48 and the pump chamber 57, so that the fluid flowing into the suction space 65 from the ventilation hole 63 of the cover body 60 expands through the pump chamber 57 expanded from the suction hole 48. Flows into.
[0026]
At the same time, the diaphragm 26 of the other expanded pump chamber 57 rises, so that the pump chamber 57 contracts and the pressure of the fluid in the pump chamber 57 rises. At this time, the first valve body 50 functions as a check valve that prevents fluid from flowing from the pump chamber 57 to the suction hole 48. Is closed. On the other hand, since the tongue piece 32a of the second valve body 32 opens between the pump chamber 57 and the discharge port 46, the fluid in the pump chamber 57 is pumped to the hollow section 43 through the groove 44 of the hollow section 43. From the discharge port 46. Since the expansion and contraction operation of the pump chamber 57 is performed sequentially and continuously in each pump chamber 57, the fluid is continuously discharged from the discharge port 60.
[0027]
Next, the operation of the first valve body 50 when the fluid passes from the suction hole 48 to the pump chamber 57 will be described with reference to FIG.
When the pump chamber 57 expands and the pump chamber 57 becomes in a negative pressure state, the fluid supplied to the pump chamber 57 through the suction hole 48 moves the movable portion 52 of the first valve body 50 from the surface of the diaphragm 40. It is elastically deformed in the direction of arrow A in FIG. At this time, since the circumferential width L1 of the rib 55 of the movable portion 52 is formed smaller than the interval L2 between the ribs 55 adjacent to each other, the rib 55 causes the circumferential direction of the movable portion 52 (in the drawing). , Arrow B direction) is only partially high. Therefore, when the first valve body 50 is closed, the entire periphery of the peripheral edge of the movable portion 52 does not contact the valve holder 40 at the same time, but contacts the valve holder 40 in a temporally dispersed manner. Therefore, the contact sound does not increase, and the volume of the noise generated by the contact decreases, and as a result, the noise is reduced.
[0028]
Further, since the width of the flow path through which the fluid passes, that is, the gap between the valve holder 40 and the movable portion 52 does not become narrow, the amount S1 of the fluid passing between the movable portion 52 and the valve holder 40 does not decrease. For this purpose, a required amount of fluid can be supplied to the pump chamber 57.
[0029]
Further, since the ribs 55 are provided at equal angles in the circumferential direction of the movable portion 52, the amount of elastic deformation in the circumferential direction of the movable portion 52 becomes uniform, so that the flow of the fluid into the pump chamber 57 is reduced. It is performed smoothly. In addition, since the movable portion 52 is formed so as to gradually decrease in thickness from the center to the tip, a sufficient amount of elastic deformation of the movable portion 52 can be obtained. Is obtained. Further, since the rib 55 is formed so as to gradually increase in thickness from the center to the tip, the rigidity of the tip of the movable portion 52 having the lowest rigidity can be supplemented. Vibration can be reduced.
[0030]
Although the number of ribs is set to nine, the number is not limited to this, and is preferably three to twelve depending on the number of intake holes 48. Also, an example in which the first valve body 50 of the present invention is used for a diaphragm pump has been described. However, the present invention is not limited to this, and can be used as a check valve for various devices.
[0031]
【The invention's effect】
As described above, according to the present invention, not only can noise caused by vibration be reduced, but also a required amount of fluid can be passed.
[0032]
Further, according to the second aspect of the present invention, the vibration of the tip end where vibration is most likely to occur can be reduced, so that noise can be surely reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view of a diaphragm pump using a check valve according to the present invention.
FIGS. 2A and 2B show a diaphragm in a diaphragm pump using a check valve according to the present invention, wherein FIG. 2A is a plan view and FIG. 2B is II (b) -II (b) in FIG. FIG.
3A and 3B show a valve holder in a diaphragm pump using a check valve according to the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a view III (b) -III () in FIG. b) Line sectional view, and FIG. 3C is a bottom view.
FIG. 4A is an enlarged sectional view showing a state in which a check valve according to the present invention is mounted on a partition, and FIG. 4B is a bottom view of the check valve.
FIG. 5 is a model cross-sectional view showing the check valve according to the present invention in an expanded and expanded circumferential direction in order to explain an operation state of the check valve;
FIG. 6 is a cross-sectional view of a model in which a circumferential direction of a check valve is developed and enlarged in order to explain an operation state of a conventional check valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 2 ... Motor, 5 ... Crank base, 7 ... Drive shaft, 10 ... Drive body, 20 ... Diaphragm holder, 25 ... Diaphragm, 26 ... Diaphragm part, 32 ... Second valve body, 32a, 32b , 32c: tongue piece, 40: valve holder (partition wall), 43: hollow part, 46: discharge port, 47: mounting hole, 48: intake hole, 50: first valve body (return valve), 51: mounting Reference numeral 52, movable part, 55, rib, 57, pump chamber, 60, intake housing, 63, vent, 65, intake space.

Claims (2)

軸状に形成された取付部と、この取付部の一端に取付部を中心として取付部の軸線方向と略直交する方向に拡がりを有する円板状に形成された可動部とによって形成され、前記取付部が隔壁に取り付けられ前記可動部が隔壁に形成した流体の通る貫通孔を開閉する逆止め弁において、前記可動部の隔壁に対接する面と反対側の面に放射状に伸びるリブを複数設けたことを特徴とする逆止め弁。An attachment portion formed in a shaft shape, and a movable portion formed in a disk shape having an extension at one end of the attachment portion in a direction substantially orthogonal to an axial direction of the attachment portion with the attachment portion as a center, In a check valve in which an attachment portion is attached to a partition and the movable portion opens and closes a through hole through which a fluid formed in the partition is provided, a plurality of radially extending ribs are provided on a surface of the movable portion opposite to a surface in contact with the partition. A check valve. 請求項1記載の逆止め弁において、前記可動部の厚みを中心部から先端に向かって薄く形成し、前記リブの厚みを中心部から先端に向かって厚く形成したことを特徴とする逆止め弁。2. The check valve according to claim 1, wherein the thickness of the movable portion is reduced from the center to the tip, and the thickness of the rib is increased from the center to the tip. .
JP2002333362A 2002-11-18 2002-11-18 Check valve Expired - Lifetime JP4150244B2 (en)

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US7793656B2 (en) 2002-06-03 2010-09-14 Lifetime Products, Inc. Underwater breathing devices and methods
US7823585B2 (en) 2004-10-08 2010-11-02 Mark Johnson Snorkel clip
US8011363B2 (en) 2002-06-03 2011-09-06 Mark Johnson Exhalation valve for use in a breathing device
US8011364B2 (en) 2006-05-18 2011-09-06 Johnson Mark R Exhalation valve for use in an underwater breathing device
US8205640B2 (en) 2009-02-24 2012-06-26 Murata Manufacturing Co., Ltd. Check valve, fluid device, and pump
US8297318B2 (en) 2005-05-21 2012-10-30 Mark Johnson Check valve
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7793656B2 (en) 2002-06-03 2010-09-14 Lifetime Products, Inc. Underwater breathing devices and methods
US8011363B2 (en) 2002-06-03 2011-09-06 Mark Johnson Exhalation valve for use in a breathing device
US7823585B2 (en) 2004-10-08 2010-11-02 Mark Johnson Snorkel clip
US8297318B2 (en) 2005-05-21 2012-10-30 Mark Johnson Check valve
US8011364B2 (en) 2006-05-18 2011-09-06 Johnson Mark R Exhalation valve for use in an underwater breathing device
US8205640B2 (en) 2009-02-24 2012-06-26 Murata Manufacturing Co., Ltd. Check valve, fluid device, and pump
KR20200036509A (en) * 2018-09-28 2020-04-07 주식회사 세원 Cap assembly of oil reservoir tank for power steering
KR102110137B1 (en) 2018-09-28 2020-05-13 주식회사 세원 Cap assembly of oil reservoir tank for power steering
KR102245460B1 (en) * 2019-12-30 2021-04-29 최영진 Trap for Fluid Discharge Line

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