JP2505787Y2 - Flow control valve - Google Patents
Flow control valveInfo
- Publication number
- JP2505787Y2 JP2505787Y2 JP13893089U JP13893089U JP2505787Y2 JP 2505787 Y2 JP2505787 Y2 JP 2505787Y2 JP 13893089 U JP13893089 U JP 13893089U JP 13893089 U JP13893089 U JP 13893089U JP 2505787 Y2 JP2505787 Y2 JP 2505787Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- collar
- flow rate
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Safety Valves (AREA)
Description
【考案の詳細な説明】 (産業上の利用分野) この考案は流体の流量を制御する流量制御弁に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a flow rate control valve for controlling the flow rate of a fluid.
(従来の技術) 従来、円筒状のバルブケースの両端に流体の流入口、
流出口を設け、バルブケース内に円柱状の弁体を挿入
し、バルブケースの内側壁と弁体の外側壁との隙間を流
体オリフィスとして流体の流量を制御するようにした流
量制御弁が知られている。例えば特開昭和62-1500021号
に開示された、内燃機関のブローバイガスの還流流量を
制御するPCVバルブがその例である。(Prior Art) Conventionally, a fluid inlet is provided at both ends of a cylindrical valve case,
A known flow control valve is one that has an outflow port, inserts a cylindrical valve body into the valve case, and uses the gap between the inner wall of the valve case and the outer wall of the valve body as a fluid orifice to control the flow rate of the fluid. Has been. An example thereof is the PCV valve disclosed in JP-A-62-1500021, which controls the flow-back flow rate of blow-by gas in an internal combustion engine.
このような流量制御バルブは軽量化をはかり、特に弁
体を軽くして微細な圧力差に対する応動性を良くするた
め、あるいはバルブの製造を簡易にするため、バルブケ
ースおよび弁体を合成樹脂製とし射出成形法などによっ
て製作されている。Such a flow rate control valve is made lightweight, especially in order to lighten the valve element to improve the responsiveness to a minute pressure difference, or to simplify the manufacture of the valve, the valve case and the valve element are made of synthetic resin. It is manufactured by the injection molding method.
(考案が解決しようとする課題) 上記のような流量制御弁はバルブケース内側壁と弁体
外側壁との隙間にオリフィス作用をさせ流量の絞り程度
を調整するものであるから、この隙間は正確でありかつ
長さ方向に対して均一でなければならない。(Problems to be solved by the invention) Since the flow control valve as described above adjusts the degree of throttle of the flow rate by applying an orifice action to the gap between the inner wall of the valve case and the outer wall of the valve body, this gap is accurate. Must be present and uniform along the length.
しかるに上記のような合成樹脂成形品では、この寸法
精度にバラツキがあり、隙間を正確かつ均一にすること
が困難である。これは素材の組成や成形条件等によって
製品寸法に差異が生ずるからである。また使用中の経時
変化として熱や水分による膨潤で寸法変化を生ずること
があるうえ、摩耗にも弱い。従って従来のものは正確な
流量制御をさせ、かつその機能を長期に維持することが
困難であった。However, in the synthetic resin molded product as described above, the dimensional accuracy varies, and it is difficult to make the gap accurate and uniform. This is because the product dimensions differ depending on the material composition and molding conditions. In addition, aging may cause dimensional swelling due to swelling due to heat and moisture, and it is also weak against wear. Therefore, it is difficult for the conventional device to control the flow rate accurately and maintain its function for a long period of time.
(課題を解決するための手段) この考案の流量制御弁は一方端に流出口、他方端に流
入口を設けた円筒状のバルブケースの内壁に硬質無機材
料でなるカラーを挿入固着し、流出口側の一端が先細り
となり、流入口側となる他端寄りに硬質無機材料でなる
カラーを嵌着した円柱状の弁体を、バルブケース内に移
動自在に挿入し、弁体をスプリングによって流入口方向
へ押圧するようにした合成樹脂製の流量制御バルブであ
る。この硬質無機材料とは例えば金属、セラミックなど
である。(Means for Solving the Problems) The flow control valve of the present invention has a collar made of a hard inorganic material inserted and fixed to the inner wall of a cylindrical valve case having an outflow port at one end and an inflow port at the other end. One end on the outlet side is tapered, and a cylindrical valve body with a collar made of a hard inorganic material fitted near the other end on the inlet side is movably inserted into the valve case, and the valve body is flowed by a spring. It is a flow control valve made of synthetic resin that is pressed in the direction of the inlet. The hard inorganic material is, for example, metal or ceramic.
(作用) この流量制御弁は、流入口と流出口の圧力差(例えば
流出口側の負圧)が生じ、漸増するに従がい弁を通過す
る流量が増加し、順次弁体はスプリングの力に抗して流
出口側に移動する。すると弁体一端の先細り部分がカラ
ー内壁に重なり、順次に流量を減少させる。圧力差に応
じて一層弁体が移動するとカラーと弁体のリングが重な
りオリフィス作用をして流量を絞る。カラーとリングと
は精密寸法に仕上げることができるうえ膨潤等の径時変
化がないので、オリフィスとなる隙間は正確で変化しな
い。また圧力差が大になるほどカラーとリングの重なり
長さは長くなり、その隙間は均一であるから圧力差によ
る流量増大傾向は隙間の重なり長さによって相殺され、
一定の微小流量となる。(Operation) In this flow control valve, a pressure difference between the inlet and the outlet (for example, negative pressure on the outlet side) is generated, the flow rate passing through the follower valve gradually increases, and the valve body sequentially has a spring force. Move to the outlet side against. Then, the tapered portion at one end of the valve body overlaps the inner wall of the collar, and the flow rate is gradually reduced. When the valve body further moves in accordance with the pressure difference, the collar and the ring of the valve body overlap each other to act as an orifice to reduce the flow rate. Since the collar and ring can be finished to precise dimensions and there is no change over time such as swelling, the gap that becomes the orifice is accurate and does not change. Also, the larger the pressure difference, the longer the overlapping length of the collar and the ring, and since the gap is uniform, the tendency of the flow rate increase due to the pressure difference is offset by the overlapping length of the gap,
It becomes a constant minute flow rate.
(実施例) 第1図に実施例を示す。流量制御弁1は内燃機関のブ
ローバイガスの還流量を制御するためのものであり、バ
ルブケース2と弁体5とスプリング6とでなる。バルブ
ケース2は合成樹脂でなり、底面に流入口7を設けた円
筒状のボディ3の開口端のつば部8と、一方端を流出口
9とした円筒状カバー4の他方端のつば部10とが溶着さ
れてなる。カバー4の内側壁には金属製カラー11が挿入
固着されている。カラー11はカバー4を射出成形すると
きインサート成形されるものである。カラー11の外径部
分には成形後の固着を十分にするためつば11bが設けら
れている。バルブケース2内には円柱状の合成樹脂製弁
体5が移動自在に挿入されている。弁体5の流出口9に
対向する一端は先細り部5aをなし、他端は切欠き12aを
複数個所に設けたフランジ12が形成され流入口7と隙間
dをへだてて対向している。フランジ12に近い位置に金
属製のリング13が嵌め込まれている。リング13の内径部
分には溝13bを備え嵌め込みの固着を確実にしている。
リング13は弁体5成形の際インサート成形される。リン
グ13の外径13aはカラー11の内径11aよりやや小になって
いる。フランジ12と、カバー4のつば部10内方に設けら
れた段付部との間にコイルスプリング6が配設される。(Example) An example is shown in FIG. The flow control valve 1 is for controlling the amount of recirculation of blow-by gas in the internal combustion engine, and includes a valve case 2, a valve body 5, and a spring 6. The valve case 2 is made of synthetic resin and has a flange 8 at the open end of a cylindrical body 3 having a bottom surface provided with an inflow port 7 and a flange 10 at the other end of the cylindrical cover 4 having one end as an outflow port 9. And are welded together. A metal collar 11 is inserted and fixed to the inner wall of the cover 4. The collar 11 is insert-molded when the cover 4 is injection-molded. A collar 11b is provided on the outer diameter portion of the collar 11 in order to ensure sufficient fixation after molding. A cylindrical synthetic resin valve body 5 is movably inserted into the valve case 2. One end of the valve body 5 facing the outflow port 9 forms a tapered portion 5a, and the other end of the valve body 5 is formed with a flange 12 provided with a plurality of notches 12a at a plurality of positions to face the inflow port 7 with a gap d therebetween. A metal ring 13 is fitted in a position close to the flange 12. A groove 13b is provided in the inner diameter portion of the ring 13 to secure the fitting and fixing.
The ring 13 is insert-molded when the valve body 5 is molded. The outer diameter 13a of the ring 13 is slightly smaller than the inner diameter 11a of the collar 11. The coil spring 6 is disposed between the flange 12 and the stepped portion provided inside the flange portion 10 of the cover 4.
この流量制御弁1は内燃機関のインテークマニホルド
の負圧が流出口9に伝わり、スプリング6のばね力に抗
して弁体5を流出口9方向に吸引し、流量が増加する。
(第2図X部)さらに負圧が増すと弁体5は一層流出口
9方向へ進むから弁体5の先端り部分5aがカラー11に重
なりはじめ順次流量が減少してゆく。(第2図Y部)さ
らに負圧が高くなるとカラー11とリング13とが重なり、
カラー内径11aとリング外径13aの隙間がオリフィスとな
り流量が絞られる(第2図Z)カラー11、リング13は共
に金属製であり内径11a、外径13aは精密な寸法精度を持
たせることができ、径時変化もないので微小な流量を正
確に制御し、かつこれを長期に維持することができる。
弁体5は一部分にリングを取付けたのみであるから、弁
体の軽さを損なう程度には至らず応動性を阻げない。In the flow rate control valve 1, negative pressure of the intake manifold of the internal combustion engine is transmitted to the outflow port 9, and the valve body 5 is attracted toward the outflow port 9 against the spring force of the spring 6 to increase the flow rate.
(X part in FIG. 2) When the negative pressure is further increased, the valve body 5 further advances toward the outlet 9, and the tip portion 5a of the valve body 5 begins to overlap the collar 11 and the flow rate is gradually reduced. (Y part in FIG. 2) When the negative pressure further increases, the collar 11 and the ring 13 overlap,
The gap between the collar inner diameter 11a and the ring outer diameter 13a serves as an orifice to reduce the flow rate (Fig. 2Z). Both the collar 11 and the ring 13 are made of metal, and the inner diameter 11a and the outer diameter 13a can have precise dimensional accuracy. Since it does not change over time, it is possible to accurately control a minute flow rate and maintain it for a long period of time.
Since only a part of the valve body 5 is provided with a ring, the lightness of the valve body is not impaired and the responsiveness is not impeded.
第2図において、X,Y,Zで示す各領域の流量幅は流量
のバラツキ幅である。カラーとリングを装着しない従来
のものは、第2図Zの領域に対応する流量バラツキ幅が
Wとなる。In FIG. 2, the flow width of each area indicated by X, Y, and Z is the width of variation in flow. In the conventional case in which the collar and the ring are not attached, the width of the flow rate variation corresponding to the area of Z in FIG. 2 is W.
このように高負圧域においてバラツキの少ない微小流
量を正確に制御することが必要とされるのは、例えば内
燃機関のアイドル運転時のように高負圧で燃料供給が少
いとき、ブローバイガスの混入量が大量でかつ変動があ
ると、燃焼不調になるからである。In such a high negative pressure range, it is necessary to accurately control the minute flow rate with little variation, for example, when the fuel supply is high and the negative pressure is low, such as during idle operation of the internal combustion engine, the blow-by gas This is because if there is a large amount of fluctuations in the mixture and the fluctuations occur, combustion will become sick.
(考案の効果) この考案の流量制御弁はカラーとリングの組み合せに
より、微小流量を正確に制御することができ、その機能
が径時変化により悪化することがない。また弁の応動性
も阻げることはないので微小な圧力差に対し迅速正確、
かつ安定した作動をするという効果がある。(Effect of the Invention) The flow rate control valve of the present invention can accurately control a minute flow rate by the combination of the collar and the ring, and its function is not deteriorated by the change over time. Also, since the valve responsiveness is not hindered, it is quick and accurate for minute pressure differences,
And there is an effect that it operates stably.
第1図はこの考案の実施例の断面図、第2図は弁の作動
特性を示す線図である。 2……バルブケース、5……弁体 6……スプリング、7……流入口 9……流出口、11……カラー 13……リングFIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a diagram showing the operating characteristics of a valve. 2 …… Valve case, 5 …… Valve body 6 …… Spring, 7 …… Inlet port 9 …… Outlet port, 11 …… Color 13 …… Ring
Claims (1)
円筒状の合成樹脂製バルブケースの内壁に硬質無機材料
でなるカラーを挿入固着し、流出口側の一端を先細りと
した円柱状の合成樹脂製弁体の他端寄りに硬質無機材料
でなるリングを嵌着し、リング外径寸法をカラー内径寸
法よりやや小として該弁体をバルブケース内に移動自在
に挿入し、バルブケース内に配設したスプリングで該弁
体を流入口方向へ押圧してなる流量制御弁。1. A collar made of a hard inorganic material is inserted and fixed to the inner wall of a cylindrical synthetic resin valve case having an outlet on one end and an inlet on the other end, and one end on the outlet side is tapered. A ring made of a hard inorganic material is fitted near the other end of a cylindrical synthetic resin valve body, and the valve body is movably inserted into the valve case with the outer diameter of the ring being slightly smaller than the inner diameter of the collar. A flow control valve in which a spring disposed in a valve case presses the valve body toward an inlet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13893089U JP2505787Y2 (en) | 1989-11-30 | 1989-11-30 | Flow control valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13893089U JP2505787Y2 (en) | 1989-11-30 | 1989-11-30 | Flow control valve |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0378182U JPH0378182U (en) | 1991-08-07 |
JP2505787Y2 true JP2505787Y2 (en) | 1996-07-31 |
Family
ID=31686004
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13893089U Expired - Lifetime JP2505787Y2 (en) | 1989-11-30 | 1989-11-30 | Flow control valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2505787Y2 (en) |
-
1989
- 1989-11-30 JP JP13893089U patent/JP2505787Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0378182U (en) | 1991-08-07 |
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