JP2005024021A

JP2005024021A - Spring supporting structure for control valve

Info

Publication number: JP2005024021A
Application number: JP2003191053A
Authority: JP
Inventors: Futoshi Yoshida; 太志吉田; Seiichi Nagata; 精一永田; Tetsuhiro Tsukiji; 徹浩築地
Original assignee: Kayaba Industry Co Ltd
Current assignee: KYB Corp
Priority date: 2003-07-03
Filing date: 2003-07-03
Publication date: 2005-01-27

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring supporting structure for a control valve, preventing unusual sounds resulting from the deformation of a compression coil spring in the radial direction. <P>SOLUTION: The spring supporting structure for the control valve 10 comprises a valve element 2 for controlling the flow of operating fluid, a spring support 3 for storing the valve element 2, a seat 4 on which the valve element 2 is seated, and the compression coil spring 5 for pushing the valve element 2 against the seat 4. As the valve element is moved apart from the seat 4 while compressing the compression coil spring 5, the operating fluid flows through the seat 4 to the side of the compression coil spring 5. Furthermore, it has a spring holder 6 for restricting the deformation of the compression coil spring 5 in the radial direction. The spring holder 6 faces at least a central portion 5c of the compression coil spring 5 for restricting the deformation of the central portion 5c of the compression coil spring 5 in the radial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば圧力制御弁、流量制御弁等に用いられ、圧縮コイルバネのバネ力によって弁体がシートに押し付けられるバネ支持構造の改良に関するものである。
【０００２】
【従来の技術】
従来、この種の制御弁のバネ支持構造として、図１０の（ａ），（ｂ）に示すものがある（特許文献１参照）。
【０００３】
これについて説明すると、図に示す弁は、バネ収容体１９のバネ収容室３４に圧縮コイルバネ２０が収容され、その弾発力で弁体１８が弁座１３に押付けられるバネ平衡式弁である。バネ収容室３４の開口側部分にバネ保持体４０が設けられる。このバネ保持体４０は、バネ収容体１９及び圧縮コイルバネ２０を構成する材料よりも弾性係数の低い材料で構成され、その内周面と圧縮コイルバネ２０とが接触する状態で圧縮コイルバネ２０を保持する。
【０００４】
これによれば、バネ保持体４０と圧縮コイルバネ２０とが密着した状態で圧縮コイルバネ２０が保持されているので、この圧縮コイルバネ２０の径方向への揺動が規制され、ひいては、圧縮コイルバネ２０に支えられる弁体１８の径方向の動きが規制され、弁体１８の振動に起因する異音の発生が抑止される。
【０００５】
【特許文献１】
特開２００２−２９５７０２号公報
【０００６】
【発明が解決しようとする課題】
しかしながら、このような従来の制御弁のバネ支持構造は、圧縮コイルバネ２０の径方向への揺動を、当該圧縮コイルバネ２０の先端部分（バネ収容室３４の開口部分）を拘束するこで抑制しようとするものであるが、例えば、図２の（ｂ）に示すように、圧縮コイルバネはその中央部付近で最も径方向の変形、振動が大きくなる。したがって、圧縮コイルバネ２０の先端部分のみを拘束しても、その変形、振動を十分に抑えることができない。
【０００７】
圧縮コイルバネ２０の中央部付近での変形、振動を有効に抑えることができなければ、依然として、圧縮コイルバネ２０の振動に起因する異音の発生や、圧縮コイルバネ２０の変形や振動を契機とした弁体の偏心等が起こる可能性がある。
【０００８】
そこで、本発明では弁体の開弁時等に生じる圧縮コイルバネの径方向への変形を、圧縮コイルバネの中央部付近を中心に規制、拘束することで抑制し、圧縮コイルバネの変形や振動に伴う異音の発生等を有効に防止できる制御弁のバネ支持構造を提供することを目的とする。
【０００９】
【課題を解決するための手段】
この発明は、作動流体の流れを制御する弁体と、この弁体を着座させるシートと、弁体をこのシートに押し付ける圧縮コイルバネとを備え、弁体が圧縮コイルバネを圧縮しながらシートから離れるのに伴って作動流体がシート内を通って圧縮コイルバネ側へと流れる制御弁に適用する。
【００１０】
そして、圧縮コイルバネの径方向の変形を規制するバネ保持体を設け、このバネ保持体を少なくとも圧縮コイルバネの中央部に対峙させ、圧縮コイルバネの変形を径方向について規制する構成としたことを特徴とするものとした。
【００１１】
これにより、圧縮コイルバネの変形や振動に伴う異音の発生や弁体の偏心を防止することができる。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基づいて説明する。
【００１３】
図１は、作動流体の圧力、流量を制御するポペット形制御弁１０のバネ支持構造を示す。
【００１４】
制御弁１０は、作動流体の流れを制御する球状の弁体２と、この弁体２を収める筒状の本体１と、この弁体２を着座させるシート４と、弁体２をこのシート４に押し付ける圧縮コイルバネ５とを備え、シート４の内側に作動流体が流れる上流側圧力室７が画成される。弁体２の前後差圧が所定値を超えて上昇すると、弁体２が圧縮コイルバネ５を圧縮しながらシート４から離れ、作動流体が図中矢印で示すようにシート４内の上流側圧力室７を通って本体１内の下流側圧力室８（圧縮コイルバネ５側）へと流れる。
【００１５】
圧縮コイルバネ５は線状のバネ材を螺旋状に巻回して形成される。圧縮コイルバネ５はバネ受け体３、弁体２、シート４と同軸上に配置され、所定量だけ圧縮された状態で本体１とバネ受け体３の間に介装される。圧縮コイルバネ５の一端５ａは本体１の固定側バネ座１ａに着座する。圧縮コイルバネ５の他端５ｂはバネ受け体３に着座する。
【００１６】
バネ受け体３は圧縮コイルバネ５の他端５ｂを着座させる可動側バネ座３ａと、弁体２を着座させる窪み３ｂと、圧縮コイルバネ５の内側に挿入される軸部３ｃとを有する。軸部３ｃは圧縮コイルバネ５の内周部との間に隙間を持つ。
【００１７】
ところで、圧縮コイルバネ５が軸方向に真直ぐ伸びた非圧縮時の状態（図２の（ａ））から圧縮状態になると、圧縮コイルバネ５は径方向に変形し、その変形量は中央部５ｃで最も大きくなる（図２の（ｂ））。したがって、例えば圧縮コイルバネ５の先端部や基端部のみの変形を規制しても、中央部付近での変形を十分に抑えることができない。
【００１８】
そこで、本発明の要旨とするところであるが、バネ支持構造は、圧縮コイルバネ５の径方向の変形を規制するバネ保持体６を設け、このバネ保持体６を少なくとも圧縮コイルバネ５の中央部５ｃに対峙させ、圧縮コイルバネ５の中央部５ｃの変形を規制する構成とする。
【００１９】
本実施の形態では、円筒状のバネ保持体６は本体１と別体で形成され、本体１内に固定される。バネ保持体６はその内側に圧縮コイルバネ５の外側に対峙する規制面６ａを有し、圧縮コイルバネ５の中央部付近を外周面から拘束する。したがって、圧縮コイルバネ５の中央部５ｃはバネ保持体６によって弁体２と同軸上に保持される。なお、バネ保持体６は本体１と別体でなく、規制面６ａを本体１に一体形成しても良い。
【００２０】
圧縮コイルバネ５はバネ保持体６を貫通し、圧縮コイルバネ５の両端部がバネ保持体６から突出する。
【００２１】
以上のように、本発明のバネ支持構造は、バネ保持体６が圧縮コイルバネ５の変形量が最も大きくなる中央部５ｃに対峙して圧縮コイルバネ５の変形を径方向について規制することにより、圧縮コイルバネ５の径方向の振動を抑制でき、この振動に起因する異音の発生を有効に抑えることができる。また、圧縮コイルバネ５の振動を抑制することにより、弁体２の偏心、すなわち、弁体２に作用する横力を抑えることができ、開弁動作を安定させることができる。
【００２２】
本実施の形態では、バネ保持体６の規制面６ａが圧縮コイルバネ５の外周部に隙間を持たせることなく、両者が互いに当接するように構成した。
【００２３】
制御弁１０の開弁作動時に規制面６ａが圧縮コイルバネ５の中央部５ｃを摺接することで、規制面６ａと圧縮コイルバネ５の間にはフリクションが生じるが、このフリクションを利用して弁体２に作用する軸方向の振動に対して減衰力を付加することができる。
【００２４】
なお、本実施の形態では、圧縮コイルバネ５の両端部がバネ保持体６から突出し、規制面６ａが圧縮コイルバネ５の中央部５ｃに限って摺接させているが、これに限らず規制面６ａが圧縮コイルバネ５の全長に渡って摺接する構造としても良い。
【００２５】
他の実施の形態として、バネ保持体６の規制面６ａは圧縮コイルバネ５の外周部に隙間を持って対峙し、圧縮コイルバネ５の中央部５ｃの変形を規制する構成としても良い。
【００２６】
規制面６ａと圧縮コイルバネ５の外周部間の隙間は、圧縮コイルバネ５が径方向に変形する最大変形量より小さく設定される。したがって、開弁作動時に規制面６ａと圧縮コイルバネ５の外周部とが当接し、圧縮コイルバネ５の径方向の変形を所定範囲内に抑えることができる。
【００２７】
このように、この実施の形態は規制面６ａと圧縮コイルバネ５の外周部との間に所定の隙間を設けることで、圧縮コイルバネ５の径方向の変形をある程度許容するものであるが、その変形量が所定範囲内であれば、圧縮コイルバネ５の変形に起因する異音の発生や、同じく圧縮コイルバネ５の変形に起因する弁体２の偏心等は十分に抑えることができる。
【００２８】
次に図３に示す他の実施の形態は、円筒状のバネ保持体６を本体１の固定側バネ座１ａに当接する位置まで延ばし、バネ保持体６の規制面６ａが圧縮コイルバネ５の中央部から一端に渡って対峙するものである。
【００２９】
この場合、バネ保持体６が圧縮コイルバネ５の中央部から一端に渡って配置されているので、圧縮コイルバネ５が径方向に変形することをより広い範囲で規制できる。また、規制面６ａが圧縮コイルバネ５に対峙する面積が増えるため、開弁作動時における圧縮コイルバネ５に付与されるフリクションが増加して減衰効果をより高めることができる。即ち、圧縮コイルバネ５から弁体２へと作用する軸方向の振動を効果的に抑制することができる。
【００３０】
次に図４に示す他の実施の形態を説明する。なお、前記実施の形態と同一構成部には同一符号を付す。
【００３１】
本体１の固定側バネ座１ａから円柱状のバネ保持体１ｂを圧縮コイルバネ５の内側に突出させるとともに、圧縮コイルバネ５の内周部と対峙するバネ保持体１ｂの規制面１ｃが圧縮コイルバネ５の一端（固定側バネ座１ａ側）から中央部に渡る部位を規制する構成とする。
【００３２】
また、規制面１ｃは圧縮コイルバネ５の内周部に隙間なく当接し、圧縮コイルバネ５を弁体２と同軸上に保持する。
【００３３】
以上のように、圧縮コイルバネ５の径方向の変形を圧縮コイルバネ５の内側から規制することで、圧縮コイルバネ５の振動を防止するとともに、圧縮コイルバネ５の振動に起因する弁体の偏心も防止できる。さらに、規制面１ｃと圧縮コイルバネ５の内周部が当接することで、フリクションが発生し、圧縮コイルバネ５から弁体２へと作用する軸方向の振動を減衰することができる。
【００３４】
なお、本実施の形態では、バネ保持体１ｂが本体１に一体形成されているが、これに限らず、本体１とは別体で形成してもよい。また、規制面１ｃと圧縮コイルバネ５の内周部との間に所定の隙間を持って対峙させてもよい。
【００３５】
次に図５に示す他の実施の形態を説明する。なお、前記実施の形態と同一構成部には同一符号を付す。
【００３６】
バネ受け体３の可動側バネ座３ａから円柱状のバネ保持体３ｄを圧縮コイルバネ５の内側に突出させ、このバネ保持体３ｄを圧縮コイルバネ５の内周部全域（基端（可動側バネ座３ａ）から先端（固定バネ座側）にかけて）対峙させる構成とする。
【００３７】
バネ保持体３ｄはその外周に圧縮コイルバネ５の内側に対峙する規制面３ｅを有する。この規制面３ｅは圧縮コイルバネ５の外周部に隙間なく当接し、圧縮コイルバネ５の中央部５ｃを含む全域を弁体２と同軸上に保持する。
【００３８】
バネ保持体３ｄはその先端部３ｆを本体１のガイド穴１ｄ内に摺動可能に挿入されるようになっている。したがって、例えば弁体２がシート４から離れる開弁同時に、弁体２とともにバネ受け体３も変位するが、これに伴ってバネ受け体３と一体形成されたバネ保持体３ｄもガイド穴１ｄ内を摺動しながら軸方向に変位する。
【００３９】
以上のように、圧縮コイルバネ５の変形を圧縮コイルバネ５の内側から規制することで、圧縮コイルバネ５の振動を防止するとともに、圧縮コイルバネ５の振動に起因する弁体の偏心も防止できる。さらに、規制面３ｅと圧縮コイルバネ５の内周部が当接することで、フリクションが発生し、圧縮コイルバネ５から弁体２へと作用する軸方向の振動を減衰させることができる。さらにまた、バネ保持体３ｄが本体１に形成されたガイド穴１ｄに沿って摺動する構成としたので、弁体２との同軸度を確保しやすいというメリットもある。
【００４０】
なお、本実施の形態では、バネ保持体３ｄがバネ受け体３に一体形成されているが、これに限らず、バネ受け体３とは別体で形成してもよい。また、規制面３ｅと圧縮コイルバネ５の内周部との間に所定の隙間を持って対峙させてもよい。
【００４１】
次に図６に示す他の実施の形態は、圧縮コイルバネ５の中央部付近を包囲する円筒状のバネ保持体６を設け、このバネ保持体６が本体１の内壁面１ｅに摺動可能に介装され、圧縮コイルバネ５が圧縮されるのに伴ってバネ保持体６が圧縮コイルバネ５の軸方向に摺動するものである。
【００４２】
この場合、制御弁１０の開弁作動時に圧縮コイルバネ５が圧縮されるのに伴って、バネ保持体６が圧縮コイルバネ５の中央部５ｃと一緒に軸方向に変位する。
【００４３】
このように、圧縮コイルバネ５の中央部における径方向の変形を摺動するバネ保持体６によって規制することで、圧縮コイルバネ５の振動を防止できることはもちろんのこと、バネ保持体６の外周面６ｂと本体１の内壁面１ｅ間に生じるフリクションによって、圧縮コイルバネ５から弁体２に作用する軸方向の振動を減衰することができる。
【００４４】
次に図７の（ａ），（ｂ）に示す他の実施の形態は、バネ保持体６を本体１内に摺動可能に介装し、このバネ保持体６に圧縮コイルバネ５に連結される連結部６ｃを形成するものである。
【００４５】
バネ保持体６の内周部には径方向（圧縮コイルバネ５方向）に突出する連結部６ｃが形成される。そして連結部６ｃに形成されたスリット６ｄに圧縮コイルバネ５が嵌合するようになっている。図７の（ｂ）に示すように、バネ保持体６は圧縮コイルバネ５の外周面および内周面から拘束するとともに、圧縮コイルバネ５の全周に渡って拘束する。なお、バネ保持体６の外周面６ｅは本体１の内壁面１ｅと摺接する。
【００４６】
以上の構成により、圧縮コイルバネ５が圧縮し、径方向に変形することをバネ保持体６によって抑えることができる。
【００４７】
また、バネ保持体６が圧縮コイルバネ５に嵌合するように構成することで、バネ保持体６の取り付け位置がずれることが回避される。さらには、バネ保持体６の外周面６ｅと本体１の内壁面１ｅとの間に生じるフリクションによって、弁体２に生じる軸方向の振動を減衰することもできる。
【００４８】
なお、バネ保持体６は、必ずしも圧縮コイルバネ５の全周に渡って嵌合されている必要はなく、例えば、図７の（ｃ）に示すように圧縮コイルバネ５の外周のある一部分に嵌合されていてもよい。
【００４９】
次に図８に示す他の実施の形態は、圧縮コイルバネ５を包囲する伸縮チューブ１１を設けるものである。伸縮チューブ１１は弾性材によって円筒状に形成される。
【００５０】
本実施の形態では、伸縮チューブ１１は圧縮コイルバネ５をその全長に渡って包囲するように形成される。
【００５１】
伸縮チューブ１１によって圧縮コイルバネ５周りを包囲することによって、制御弁１０の開弁作動時における圧縮コイルバネ５の圧縮時に、圧縮コイルバネ５の径方向の変形を防止することができる。
【００５２】
次に図９に示す他の実施の形態は、伸縮チューブ１１を圧縮コイルバネ５の中央部のみを包囲するように形成し、圧縮コイルバネ５の両端部を伸縮チューブ１１から突出させたものである。
【００５３】
この場合も、制御弁１０の開弁作動時における圧縮コイルバネ５の圧縮時に、圧縮コイルバネ５の径方向の変形を防止できるとともに、伸縮チューブ１１が圧縮コイルバネ５の全体を覆っていないため、作動流体は圧縮コイルバネ５及び伸縮チューブ１１の内外を通る流路を形成することができる。
【００５４】
なお、作動流体の流れを制御する弁体は球状に限らず、例えば円錐状に形成しても良い。また、弁体とバネ受け体を一体形成しても良い。
【００５５】
本発明は上記の実施の形態に限定されずに、その技術的な思想の範囲内において種々の変更がなしうることは明白である。
【図面の簡単な説明】
【図１】本発明の実施の形態を示す制御弁の断面図。
【図２】同じく（ａ）は非圧縮時の圧縮コイルバネ形状を示し、（ｂ）は圧縮時の圧縮コイルバネ形状を示す側面図。
【図３】他の実施の形態を示す制御弁の断面図。
【図４】他の実施の形態を示す制御弁の断面図。
【図５】他の実施の形態を示す制御弁の断面図。
【図６】他の実施の形態を示す制御弁の断面図。
【図７】（ａ）は他の実施の形態を示す制御弁の断面図、（ｂ）は同図のＡ−Ａ線に沿う断面図、（ｃ）はさらに他の実施の形態を示す制御弁の断面図。
【図８】他の実施の形態を示す制御弁の断面図。
【図９】他の実施の形態を示す制御弁の断面図。
【図１０】（ａ）は従来例を示す制御弁の断面図、（ｂ）は同じく制御弁の一部を拡大した断面図。
【符号の説明】
１本体
２弁体
１ｂバネ保持体
１ｃ規制面
１ｅ内壁面
３バネ受け体
３ｄバネ保持体
３ｅ規制面
４シート
５圧縮コイルバネ
５ｃ圧縮コイルバネ中央部
６バネ保持体
６ａ規制面
１０制御弁
１１伸縮チューブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a spring support structure that is used in, for example, a pressure control valve, a flow rate control valve, and the like, and a valve body is pressed against a seat by a spring force of a compression coil spring.
[0002]
[Prior art]
Conventionally, there is a structure shown in FIGS. 10A and 10B as a spring support structure of this type of control valve (see Patent Document 1).
[0003]
The valve shown in the figure is a spring-balanced valve in which the compression coil spring 20 is accommodated in the spring accommodating chamber 34 of the spring accommodating body 19 and the valve element 18 is pressed against the valve seat 13 by its elastic force. A spring holder 40 is provided at the opening side portion of the spring accommodating chamber 34. The spring holder 40 is made of a material having a lower elastic coefficient than the material constituting the spring container 19 and the compression coil spring 20, and holds the compression coil spring 20 in a state where the inner peripheral surface thereof is in contact with the compression coil spring 20. .
[0004]
According to this, since the compression coil spring 20 is held in a state where the spring holder 40 and the compression coil spring 20 are in close contact with each other, swinging of the compression coil spring 20 in the radial direction is restricted. The movement of the supported valve body 18 in the radial direction is restricted, and the generation of abnormal noise due to the vibration of the valve body 18 is suppressed.
[0005]
[Patent Document 1]
JP-A-2002-295702 [0006]
[Problems to be solved by the invention]
However, such a conventional control valve spring support structure suppresses the radial swing of the compression coil spring 20 by constraining the distal end portion of the compression coil spring 20 (the opening portion of the spring accommodating chamber 34). For example, as shown in FIG. 2B, the compression coil spring has the largest radial deformation and vibration near its center. Therefore, even if only the tip portion of the compression coil spring 20 is constrained, the deformation and vibration cannot be sufficiently suppressed.
[0007]
If deformation and vibration in the vicinity of the central portion of the compression coil spring 20 cannot be effectively suppressed, the valve is still triggered by generation of abnormal noise due to vibration of the compression coil spring 20 or deformation and vibration of the compression coil spring 20. There may be eccentricity of the body.
[0008]
Therefore, in the present invention, the deformation in the radial direction of the compression coil spring that occurs when the valve element is opened or the like is suppressed by restricting and constraining the vicinity of the central portion of the compression coil spring, and accompanying the deformation or vibration of the compression coil spring. An object of the present invention is to provide a spring support structure for a control valve that can effectively prevent the generation of abnormal noise.
[0009]
[Means for Solving the Problems]
The present invention includes a valve body that controls the flow of a working fluid, a seat on which the valve body is seated, and a compression coil spring that presses the valve body against the seat, and the valve body is separated from the seat while compressing the compression coil spring. Accordingly, the present invention is applied to a control valve in which the working fluid flows through the seat to the compression coil spring side.
[0010]
A spring holding body that restricts radial deformation of the compression coil spring is provided, the spring holding body is opposed to at least the central portion of the compression coil spring, and the deformation of the compression coil spring is restricted in the radial direction. To do.
[0011]
Thereby, generation | occurrence | production of the noise accompanying the deformation | transformation and vibration of a compression coil spring and the eccentricity of a valve body can be prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
FIG. 1 shows a spring support structure of a poppet type control valve 10 that controls the pressure and flow rate of a working fluid.
[0014]
The control valve 10 includes a spherical valve body 2 that controls the flow of the working fluid, a cylindrical main body 1 that houses the valve body 2, a seat 4 on which the valve body 2 is seated, and the valve body 2 that is seated on the seat 4. And an upstream pressure chamber 7 in which the working fluid flows inside the seat 4. When the differential pressure across the valve body 2 rises above a predetermined value, the valve body 2 moves away from the seat 4 while compressing the compression coil spring 5, and the working fluid is in the upstream pressure chamber in the seat 4 as indicated by the arrows in the figure. 7 flows to the downstream pressure chamber 8 (compression coil spring 5 side) in the main body 1.
[0015]
The compression coil spring 5 is formed by spirally winding a linear spring material. The compression coil spring 5 is disposed coaxially with the spring receiver 3, the valve body 2, and the seat 4, and is interposed between the main body 1 and the spring receiver 3 in a state compressed by a predetermined amount. One end 5 a of the compression coil spring 5 is seated on the fixed spring seat 1 a of the main body 1. The other end 5 b of the compression coil spring 5 is seated on the spring receiver 3.
[0016]
The spring receiver 3 has a movable spring seat 3 a for seating the other end 5 b of the compression coil spring 5, a recess 3 b for seating the valve body 2, and a shaft portion 3 c inserted inside the compression coil spring 5. The shaft portion 3 c has a gap between it and the inner peripheral portion of the compression coil spring 5.
[0017]
By the way, when the compression coil spring 5 is compressed from the uncompressed state in which the compression coil spring 5 extends straight in the axial direction ((a) in FIG. 2), the compression coil spring 5 is deformed in the radial direction, and the amount of deformation is the largest at the central portion 5c. It becomes larger ((b) of FIG. 2). Therefore, for example, even if the deformation of only the distal end portion or the proximal end portion of the compression coil spring 5 is restricted, the deformation near the center portion cannot be sufficiently suppressed.
[0018]
Therefore, as a gist of the present invention, the spring support structure is provided with a spring holding body 6 that restricts the deformation of the compression coil spring 5 in the radial direction, and the spring holding body 6 is provided at least in the central portion 5 c of the compression coil spring 5. It is made to oppose and it is set as the structure which controls the deformation | transformation of the center part 5c of the compression coil spring 5. FIG.
[0019]
In the present embodiment, the cylindrical spring holder 6 is formed separately from the main body 1 and is fixed in the main body 1. The spring holding body 6 has a regulating surface 6a facing the outside of the compression coil spring 5 on the inside thereof, and restrains the vicinity of the central portion of the compression coil spring 5 from the outer peripheral surface. Therefore, the central portion 5 c of the compression coil spring 5 is held coaxially with the valve body 2 by the spring holder 6. The spring holder 6 is not a separate body from the main body 1, and the regulating surface 6 a may be formed integrally with the main body 1.
[0020]
The compression coil spring 5 passes through the spring holder 6, and both end portions of the compression coil spring 5 protrude from the spring holder 6.
[0021]
As described above, in the spring support structure of the present invention, the spring holder 6 is compressed by restricting the deformation of the compression coil spring 5 in the radial direction against the central portion 5c where the deformation amount of the compression coil spring 5 is the largest. The vibration in the radial direction of the coil spring 5 can be suppressed, and the generation of abnormal noise due to this vibration can be effectively suppressed. Further, by suppressing the vibration of the compression coil spring 5, the eccentricity of the valve body 2, that is, the lateral force acting on the valve body 2 can be suppressed, and the valve opening operation can be stabilized.
[0022]
In the present embodiment, the restricting surface 6a of the spring holder 6 is configured such that both abut against each other without providing a gap in the outer peripheral portion of the compression coil spring 5.
[0023]
When the control valve 10 is opened, the regulating surface 6a is brought into sliding contact with the central portion 5c of the compression coil spring 5, whereby friction is generated between the regulation surface 6a and the compression coil spring 5, and the valve body 2 is utilized using this friction. A damping force can be applied to the axial vibration acting on the.
[0024]
In the present embodiment, both end portions of the compression coil spring 5 protrude from the spring holder 6 and the regulating surface 6a is in sliding contact only with the central portion 5c of the compression coil spring 5, but this is not restrictive, and the regulating surface 6a. It is good also as a structure which slidably contacts over the full length of the compression coil spring 5. FIG.
[0025]
As another embodiment, the restriction surface 6 a of the spring holder 6 may be opposed to the outer peripheral portion of the compression coil spring 5 with a gap to restrict deformation of the central portion 5 c of the compression coil spring 5.
[0026]
The clearance between the regulating surface 6a and the outer peripheral portion of the compression coil spring 5 is set smaller than the maximum deformation amount that the compression coil spring 5 deforms in the radial direction. Therefore, the restriction surface 6a and the outer peripheral portion of the compression coil spring 5 abut upon the valve opening operation, and the radial deformation of the compression coil spring 5 can be suppressed within a predetermined range.
[0027]
As described above, this embodiment allows a certain amount of radial deformation of the compression coil spring 5 by providing a predetermined gap between the regulating surface 6a and the outer peripheral portion of the compression coil spring 5. If the amount is within the predetermined range, it is possible to sufficiently suppress the generation of noise due to the deformation of the compression coil spring 5 and the eccentricity of the valve body 2 due to the deformation of the compression coil spring 5.
[0028]
Next, in another embodiment shown in FIG. 3, the cylindrical spring holder 6 is extended to a position where it abuts against the fixed-side spring seat 1 a of the main body 1, and the regulating surface 6 a of the spring holder 6 is the center of the compression coil spring 5. It is confronted across the end from the part.
[0029]
In this case, since the spring holding body 6 is disposed from the center to one end of the compression coil spring 5, it is possible to restrict the deformation of the compression coil spring 5 in the radial direction in a wider range. Moreover, since the area where the regulation surface 6a faces the compression coil spring 5 increases, the friction applied to the compression coil spring 5 during the valve opening operation increases, and the damping effect can be further enhanced. That is, the vibration in the axial direction that acts from the compression coil spring 5 to the valve body 2 can be effectively suppressed.
[0030]
Next, another embodiment shown in FIG. 4 will be described. In addition, the same code | symbol is attached | subjected to the same structure part as the said embodiment.
[0031]
A cylindrical spring holder 1 b protrudes from the fixed side spring seat 1 a of the main body 1 to the inside of the compression coil spring 5, and the regulation surface 1 c of the spring holder 1 b facing the inner peripheral portion of the compression coil spring 5 is the compression coil spring 5. It is set as the structure which controls the site | part which extends from one end (fixed side spring seat 1a side) to the center part.
[0032]
Further, the regulating surface 1 c is in contact with the inner peripheral portion of the compression coil spring 5 without a gap, and holds the compression coil spring 5 coaxially with the valve body 2.
[0033]
As described above, by restricting the deformation of the compression coil spring 5 in the radial direction from the inside of the compression coil spring 5, vibration of the compression coil spring 5 can be prevented, and eccentricity of the valve body due to vibration of the compression coil spring 5 can also be prevented. . Furthermore, when the regulating surface 1c and the inner peripheral portion of the compression coil spring 5 are in contact with each other, friction is generated, and the axial vibration acting from the compression coil spring 5 to the valve body 2 can be attenuated.
[0034]
In the present embodiment, the spring holding body 1b is integrally formed with the main body 1. However, the present invention is not limited to this, and the spring holding body 1b may be formed separately from the main body 1. Moreover, you may make it oppose with a predetermined clearance gap between the control surface 1c and the inner peripheral part of the compression coil spring 5. FIG.
[0035]
Next, another embodiment shown in FIG. 5 will be described. In addition, the same code | symbol is attached | subjected to the same structure part as the said embodiment.
[0036]
A cylindrical spring holder 3d is protruded from the movable side spring seat 3a of the spring receiver 3 to the inside of the compression coil spring 5, and this spring holder 3d is moved over the entire inner peripheral portion (base end (movable side spring seat) of the compression coil spring 5. 3a) to the tip (fixed spring seat side).
[0037]
The spring holder 3d has a regulating surface 3e facing the inner side of the compression coil spring 5 on the outer periphery thereof. The regulating surface 3 e abuts on the outer peripheral portion of the compression coil spring 5 without a gap, and holds the entire region including the central portion 5 c of the compression coil spring 5 coaxially with the valve body 2.
[0038]
The spring holding body 3d is slidably inserted into the guide hole 1d of the main body 1 at its tip 3f. Therefore, for example, the spring receiver 3 is displaced together with the valve body 2 at the same time when the valve body 2 is opened away from the seat 4, but the spring holder 3d integrally formed with the spring receiver 3 is also in the guide hole 1d. Is displaced in the axial direction while sliding.
[0039]
As described above, by restricting deformation of the compression coil spring 5 from the inside of the compression coil spring 5, vibration of the compression coil spring 5 can be prevented, and eccentricity of the valve body due to vibration of the compression coil spring 5 can also be prevented. Furthermore, when the regulation surface 3e and the inner peripheral portion of the compression coil spring 5 are in contact with each other, friction is generated, and the axial vibration acting from the compression coil spring 5 to the valve body 2 can be attenuated. Furthermore, since the spring holding body 3d is configured to slide along the guide hole 1d formed in the main body 1, there is also an advantage that it is easy to ensure the coaxiality with the valve body 2.
[0040]
In the present embodiment, the spring holder 3d is integrally formed with the spring receiver 3. However, the present invention is not limited to this, and the spring holder 3d may be formed separately from the spring receiver 3. Moreover, you may make it oppose with a predetermined clearance gap between the control surface 3e and the inner peripheral part of the compression coil spring 5. FIG.
[0041]
Next, another embodiment shown in FIG. 6 is provided with a cylindrical spring holder 6 that surrounds the vicinity of the central portion of the compression coil spring 5, so that the spring holder 6 can slide on the inner wall 1 e of the main body 1. The spring holding body 6 slides in the axial direction of the compression coil spring 5 as the compression coil spring 5 is compressed.
[0042]
In this case, as the compression coil spring 5 is compressed when the control valve 10 is opened, the spring holder 6 is displaced in the axial direction together with the central portion 5 c of the compression coil spring 5.
[0043]
In this way, by restricting the radial deformation at the central portion of the compression coil spring 5 by the sliding spring holder 6, the vibration of the compression coil spring 5 can be prevented, and the outer peripheral surface 6 b of the spring holder 6 can be prevented. And the inner wall surface 1e of the main body 1 can attenuate the vibration in the axial direction that acts on the valve body 2 from the compression coil spring 5.
[0044]
Next, in another embodiment shown in FIGS. 7A and 7B, a spring holder 6 is slidably interposed in the main body 1 and is connected to the compression coil spring 5 with the spring holder 6. The connecting portion 6c is formed.
[0045]
A connecting portion 6 c that protrudes in the radial direction (in the direction of the compression coil spring 5) is formed on the inner peripheral portion of the spring holder 6. The compression coil spring 5 is fitted into a slit 6d formed in the connecting portion 6c. As shown in FIG. 7B, the spring holder 6 is restrained from the outer peripheral surface and the inner peripheral surface of the compression coil spring 5 and is restrained over the entire circumference of the compression coil spring 5. The outer peripheral surface 6e of the spring holder 6 is in sliding contact with the inner wall surface 1e of the main body 1.
[0046]
With the above configuration, the spring holding body 6 can suppress the compression coil spring 5 from being compressed and deformed in the radial direction.
[0047]
Further, by configuring the spring holding body 6 so as to be fitted to the compression coil spring 5, it is possible to avoid shifting the mounting position of the spring holding body 6. Furthermore, the axial vibration generated in the valve body 2 can be attenuated by the friction generated between the outer peripheral surface 6 e of the spring holder 6 and the inner wall surface 1 e of the main body 1.
[0048]
The spring holding body 6 does not necessarily have to be fitted over the entire circumference of the compression coil spring 5; for example, as shown in FIG. May be.
[0049]
Next, another embodiment shown in FIG. 8 is provided with an expandable tube 11 surrounding the compression coil spring 5. The telescopic tube 11 is formed in a cylindrical shape by an elastic material.
[0050]
In the present embodiment, the telescopic tube 11 is formed so as to surround the compression coil spring 5 over its entire length.
[0051]
By surrounding the compression coil spring 5 around the expansion and contraction tube 11, it is possible to prevent the compression coil spring 5 from being deformed in the radial direction when the compression coil spring 5 is compressed when the control valve 10 is opened.
[0052]
Next, in another embodiment shown in FIG. 9, the expansion tube 11 is formed so as to surround only the central portion of the compression coil spring 5, and both end portions of the compression coil spring 5 are protruded from the expansion tube 11.
[0053]
Also in this case, since the compression coil spring 5 can be prevented from being deformed in the radial direction when the compression coil spring 5 is compressed during the valve opening operation of the control valve 10, and the telescopic tube 11 does not cover the entire compression coil spring 5. Can form a flow path that passes through the inside and outside of the compression coil spring 5 and the telescopic tube 11.
[0054]
The valve body that controls the flow of the working fluid is not limited to a spherical shape, and may be formed in a conical shape, for example. Further, the valve body and the spring receiving body may be integrally formed.
[0055]
The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a control valve showing an embodiment of the present invention.
2A is a side view showing a compression coil spring shape during non-compression, and FIG. 2B is a side view showing a compression coil spring shape during compression.
FIG. 3 is a cross-sectional view of a control valve showing another embodiment.
FIG. 4 is a cross-sectional view of a control valve showing another embodiment.
FIG. 5 is a cross-sectional view of a control valve showing another embodiment.
FIG. 6 is a cross-sectional view of a control valve showing another embodiment.
7A is a cross-sectional view of a control valve showing another embodiment, FIG. 7B is a cross-sectional view taken along the line AA of FIG. 7, and FIG. 7C is a control showing still another embodiment. Sectional drawing of a valve.
FIG. 8 is a cross-sectional view of a control valve showing another embodiment.
FIG. 9 is a cross-sectional view of a control valve showing another embodiment.
10A is a cross-sectional view of a conventional control valve, and FIG. 10B is an enlarged cross-sectional view of a part of the control valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Valve body 1b Spring holding body 1c Restriction surface 1e Inner wall surface 3 Spring receiving body 3d Spring holding body 3e Restriction surface 4 Seat 5 Compression coil spring 5c Compression coil spring center part 6 Spring holding body 6a Restriction surface 10 Control valve 11 Telescopic tube

Claims

A valve body that controls the flow of the working fluid, a seat on which the valve body is seated, and a compression coil spring that presses the valve body against the seat are actuated as the valve body moves away from the seat while compressing the compression coil spring. In the control valve in which the fluid flows through the seat to the compression coil spring side,
A spring holder that restricts the radial deformation of the compression coil spring is provided, the spring holder is opposed to at least the central portion of the compression coil spring, and the deformation of the compression coil spring is restricted in the radial direction. Control valve spring support structure.

2. The spring holding body has a restriction surface that abuts on an outer peripheral portion or an inner peripheral portion of the compression coil spring, and is configured to hold a central portion of the compression coil spring coaxially with the valve body. The control valve spring support structure according to claim 1.

The said spring holding body has the control surface which has a clearance gap in the outer peripheral part or inner peripheral part of the said compression coil spring, and was set as the structure which controls the deformation | transformation of the center part of a compression coil spring. The spring support structure of the control valve as described.

A spring receiver that moves together with the valve body is provided, a spring holder that penetrates the compression coil spring is formed in the spring receiver, and a guide hole is provided in the main body to slidably fit the tip of the spring receiver. 4. The spring support structure for a control valve according to claim 1, wherein the spring support structure is a control valve.

A main body for storing the compression coil spring is provided, and a spring holder is slidably disposed in the main body so as to be slidable in the axial direction of the compression coil spring. The spring support structure for a control valve according to claim 1 or 2, wherein the structure is configured to slide.

6. The control valve according to claim 5, wherein the spring holding body is formed in a cylindrical shape surrounding a compression coil spring, and an inner wall surface that slidably supports an outer peripheral surface of the spring holding body is provided on the main body. Spring support structure.

The spring support structure for a control valve according to claim 5 or 6, wherein a connecting portion connected to a compression coil spring is formed in the spring holder.

A valve body that controls the flow of the working fluid, a seat on which the valve body is seated, and a compression coil spring that presses the valve body against the seat are actuated as the valve body moves away from the seat while compressing the compression coil spring. In the control valve in which the fluid flows through the seat to the compression coil spring side,
A spring support structure for a control valve, characterized in that an expansion tube is provided to surround the compression coil spring.

9. The spring support structure for a control valve according to claim 8, wherein the expansion tube is disposed at a central portion of the compression coil spring, and both end portions of the compression coil spring protrude from the expansion tube.