JP7178837B2 - flow control valve - Google Patents

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JP7178837B2
JP7178837B2 JP2018169519A JP2018169519A JP7178837B2 JP 7178837 B2 JP7178837 B2 JP 7178837B2 JP 2018169519 A JP2018169519 A JP 2018169519A JP 2018169519 A JP2018169519 A JP 2018169519A JP 7178837 B2 JP7178837 B2 JP 7178837B2
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valve
orifice
hole
valve body
needle
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JP2020041606A (en
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大介 松村
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Eagle Industry Co Ltd
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Description

本発明は、流量制御弁に関する。 The present invention relates to flow control valves.

従来から、流体の流量を制御する流量制御弁として、図６に示す流量制御弁５１が知られている。 2. Description of the Related Art Conventionally, a flow control valve 51 shown in FIG. 6 is known as a flow control valve for controlling the flow rate of fluid.

すなわちこの流量制御弁５１は、流入ポート５３および流出ポート５４を設けるとともに両ポート５３，５４間にオリフィス孔５５を設けたボディ５２と、オリフィス孔５５に差し込まれるニードル弁体５６と、ニードル弁体５６を変位させる作動ロッド５７と、を備え、作動ロッド５７の作動によりニードル弁体５６を変位させ、オリフィス孔５５における流路断面積を変化させることで、流量を制御する構成とされている。 That is, the flow control valve 51 comprises a body 52 having an inflow port 53 and an outflow port 54 and an orifice hole 55 between the ports 53 and 54, a needle valve body 56 inserted into the orifice hole 55, a needle valve body and an operating rod 57 that displaces the needle valve body 56 , and the operation of the operating rod 57 displaces the needle valve body 56 to change the cross-sectional area of the flow path in the orifice hole 55 , thereby controlling the flow rate.

特開２００３－４２３３３号公報JP-A-2003-42333

上記構成の流量制御弁５１は、先端を先細のテーパー面状としたニードル弁体５６を変位させることで流量を制御するため、小流量域で流量を精度良く制御することが可能とされている。 The flow control valve 51 configured as described above controls the flow rate by displacing the needle valve element 56 having a tapered surface with a tapered tip, so it is possible to control the flow rate with high precision in a small flow range. .

しかしながらその反面、弁の機能が、上記したように小流量域で流量を精度良く制御することに特化されているため、小流量域で流量を精度良く制御したうえで、大流量域でも流量を制御したい、との要望に応えることができない不都合がある。 However, on the other hand, the function of the valve is specialized to accurately control the flow rate in the small flow range as described above. There is an inconvenience that it is not possible to meet the desire to control the

本発明は、小流量域で流量を精度良く制御することができ、しかもそのうえで大流量域でも流量を制御することができる流量制御弁を提供することを課題とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a flow rate control valve capable of controlling the flow rate with high accuracy in a small flow rate range and furthermore capable of controlling the flow rate even in a large flow rate range.

上記課題を解決するため、本発明の流量制御弁は、流入ポートおよび流出ポートを設け、前記両ポート間に弁孔を設けたボディを備え、前記ボディの内部で前記流入ポートに通じる弁室側で前記弁孔の周縁部に設けられた弁座と、前記弁室内に位置して、前記弁座に接離可能に着座する弁体と、前記弁体を保持し、前記弁体と共に前記ボディ内で変位可能とされたスプリングカバーと、前記弁体が前記弁座に着座する方向に前記スプリングカバーを弾性付勢するスプリングと、で構成されるリフト弁構造を有する内部弁と、前記スプリングカバーに設けられたオリフィス孔と、前記オリフィス孔の前記弁孔側の開口周縁部に設けられたオリフィス弁座と、前記オリフィス孔に前記弁孔側から差し込まれ、前記弁室に近づく方向と遠ざかる方向とに往復動するニードル弁体と、駆動源に接続され、前記駆動源に駆動されて前記弁室と反対側から前記ニードル弁体を変位させる作動ロッドと、を備え、前記ニードル弁体は、前記弁室側を向いた先端側に、前記オリフィス孔の内径よりも小径で、前記オリフィス孔内に位置するときに前記オリフィス孔の内面との間にオリフィス流路を形成する先端部と、前記作動ロッドの作動にしたがい前記ニードル弁体が前記弁室側へストロークしたときに前記オリフィス弁座に着座する段差状の後端部と、前記先端部から径寸法を徐々に拡大し、前記オリフィス孔に嵌り合う径寸法になるとその径寸法のまま延びて前記後端部に連絡する部分と、を備え、前記内部弁は、前記オリフィス弁座に着座した前記ニードル弁体が前記弁室側へストロークして前記スプリングカバーを押圧し変位させることによって開弁することを特徴とする。 In order to solve the above problems, the flow control valve of the present invention includes a body provided with an inflow port and an outflow port, and a valve hole provided between the two ports. a valve seat provided on the periphery of the valve hole; a valve body positioned in the valve chamber and seated on the valve seat so as to be able to contact and separate from the valve seat; an internal valve having a lift valve structure composed of a spring cover displaceable inside and a spring elastically biasing the spring cover in a direction in which the valve body is seated on the valve seat; and the spring cover an orifice hole provided in the orifice hole, an orifice valve seat provided in the peripheral edge of the opening of the orifice hole on the valve hole side, and an orifice valve seat inserted into the orifice hole from the valve hole side in a direction approaching the valve chamber and a direction away from the valve chamber and an operating rod connected to a drive source and driven by the drive source to displace the needle valve body from the side opposite to the valve chamber, wherein the needle valve body a tip portion having a smaller diameter than the inner diameter of the orifice hole and forming an orifice flow path between itself and the inner surface of the orifice hole when positioned in the orifice hole, on the tip side facing the valve chamber; a stepped rear end that is seated on the orifice valve seat when the needle valve element strokes toward the valve chamber in accordance with the operation of the operating rod; and a portion that extends to communicate with the rear end portion when the diameter becomes a size that fits in the orifice valve seat, and the internal valve is such that the needle valve body seated on the orifice valve seat strokes toward the valve chamber side. The valve is opened by pressing and displacing the spring cover.

また、実施の態様として、上記記載の流量制御弁において、前記ニードル弁体は、前記オリフィス孔の内径よりも小径の先端部と、前記先端部から径寸法が徐々に拡大する形状のテーパー部と、前記オリフィス弁座に着座し、前記スプリングカバーを押圧し変位させる後端部とを有することを特徴とする。 Further, as an embodiment, in the above-described flow control valve, the needle valve body includes a tip portion having a smaller diameter than the inner diameter of the orifice hole and a tapered portion having a shape in which the diameter dimension gradually increases from the tip portion. and a rear end portion which is seated on the orifice valve seat and presses and displaces the spring cover.

上記構成を備える本発明の流量制御弁では、オリフィス孔に対しニードル弁体を変位させることにより小流量域で流量を精度良く制御することが可能とされ、スプリングカバーの変位に伴って弁体および弁座間の流体流路を開放することにより大流量域でも流量を制御することが可能とされる。したがって流量制御弁に、小流量域で流量を精度良く制御する機能と、大流量域でも流量を制御する機能とを双方共に持たせることが可能とされる。 In the flow control valve of the present invention having the above configuration, it is possible to accurately control the flow rate in a small flow rate range by displacing the needle valve body with respect to the orifice hole. By opening the fluid flow path between the valve seats, it is possible to control the flow rate even in a large flow range. Therefore, the flow control valve can have both the function of controlling the flow accurately in the small flow range and the function of controlling the flow even in the large flow range.

実施の形態に係る流量制御弁の要部断面図Principal part sectional drawing of the flow control valve which concerns on embodiment 同流量制御弁の作動状態を示す要部断面図Principal part cross-sectional view showing the operating state of the same flow control valve 同流量制御弁の作動状態を示す要部断面図Cross-sectional view of the main part showing the operating state of the same flow control valve 同流量制御弁の作動状態を示す要部断面図Principal part cross-sectional view showing the operating state of the same flow control valve 同流量制御弁の作動特性を示すグラフ図Graph showing the operating characteristics of the same flow control valve 背景技術に係る流量制御弁の要部断面図Cross-sectional view of a main part of a flow control valve according to background art

図１は、実施の形態に係る流量制御弁１を示している。流量制御弁１は、以下のように構成されている。 FIG. 1 shows a flow control valve 1 according to an embodiment. The flow control valve 1 is configured as follows.

すなわち流量制御弁１は、流体の流入ポート３および流出ポート４を設けた密閉構造のボディ（弁ボディ）２を備え、このボディ２の内部であって両ポート３，４間に仕切り壁５が設けられ、仕切り壁５に弁孔６が設けられ、弁孔６の周縁部であって流入ポート３に通じる弁室７側に弁座８が設けられている。 That is, the flow control valve 1 comprises a closed body (valve body) 2 having an inflow port 3 and an outflow port 4 for fluid. A valve hole 6 is provided in the partition wall 5 , and a valve seat 8 is provided on the peripheral edge of the valve hole 6 on the side of the valve chamber 7 communicating with the inflow port 3 .

弁室７内に位置して、弁座８に接離可能に着座する弁体９が設けられ、弁体９はスプリングカバー１０に保持されて、スプリングカバー１０とともに弁室７内で変位する。 A valve disc 9 is positioned in the valve chamber 7 and is removably seated on the valve seat 8 .

スプリングカバー１０およびボディ２間に復帰バネとしてのスプリング１１が介装され、スプリング１１は、弁体９が弁座８に着座する方向にスプリングカバー１０を弾性付勢している。この弾性付勢により弁体９は弁座８に着座しており、よってここに常時閉型の内部弁１２が設けられている。 A spring 11 as a return spring is interposed between the spring cover 10 and the body 2 , and the spring 11 elastically biases the spring cover 10 in the direction in which the valve body 9 is seated on the valve seat 8 . Due to this elastic bias, the valve body 9 is seated on the valve seat 8, so that a normally closed internal valve 12 is provided here.

スプリングカバー１０に、所定の内径寸法を備える円筒面状のオリフィス孔１３が設けられ、このオリフィス孔１３の弁孔６側の開口周縁部にオリフィス弁座１４が設けられている。 A cylindrical orifice hole 13 having a predetermined inner diameter is provided in the spring cover 10 , and an orifice valve seat 14 is provided on the peripheral edge of the opening of the orifice hole 13 on the valve hole 6 side.

また、オリフィス孔１３に弁孔６側からニードル弁体１５が差し込まれ、ニードル弁体１５は作動ロッド１６に保持されて、作動ロッド１６の作動にしたがって変位する。作動ロッド１６は、図示しない駆動源に接続される。ニードル弁体１５と作動ロッド１６は一体に形成されていても良い。 A needle valve body 15 is inserted into the orifice hole 13 from the valve hole 6 side, and the needle valve body 15 is held by an operating rod 16 and displaced as the operating rod 16 is operated. The operating rod 16 is connected to a drive source (not shown). The needle valve body 15 and the operating rod 16 may be integrally formed.

ニードル弁体１５は、オリフィス孔１３の内径よりも小径の円筒面状に形成された先端部１５ａと、先端部１５ａから径寸法が徐々に拡大する形状に形成されたテーパー部１５ｂと、オリフィス弁座１４に着座可能とされるとともに着座時にスプリングカバー１０を押圧し変位させることが可能な段差状に形成された後端部（オリフィス弁体部）１５ｃとを一体に有している。 The needle valve body 15 includes a tip portion 15a formed in a cylindrical surface shape with a smaller diameter than the inner diameter of the orifice hole 13, a tapered portion 15b formed in a shape that gradually increases in diameter from the tip portion 15a, and an orifice valve. It integrally has a stepped rear end portion (orifice valve body portion) 15c that can be seated on the seat 14 and that can press and displace the spring cover 10 when seated.

上記構成の流量制御弁１は、以下のように作動する。 The flow control valve 1 configured as described above operates as follows.

図１は、流量制御弁１の初動時の状態を示している。この初動時、弁体９は弁座８に着座しており、よって内部弁１２は閉弁している。また、ニードル弁体１５の先端部１５ａがオリフィス孔１３内に位置しており、よって先端部１５ａとオリフィス孔１３内面との間に所定の流路断面積を有するオリフィス流路１７が形成されている。したがってこのオリフィス流路１７を経由して流体が流入ポート３から流出ポート４へ流通する。初動時であるので図５のグラフ図では、グラフ横軸のストローク量が零とされ、このときの流量がポイントＰ１にて示されている。 FIG. 1 shows the state of the flow control valve 1 at the time of initial operation. At the time of this initial movement, the valve body 9 is seated on the valve seat 8, so the internal valve 12 is closed. Further, the tip portion 15a of the needle valve body 15 is positioned within the orifice hole 13, so that an orifice passage 17 having a predetermined flow passage cross-sectional area is formed between the tip portion 15a and the inner surface of the orifice hole 13. there is Therefore, the fluid flows from the inflow port 3 to the outflow port 4 via this orifice channel 17 . Since this is the initial motion, in the graph of FIG. 5, the stroke amount on the horizontal axis of the graph is zero, and the flow rate at this time is indicated by point P1.

上記初動時の状態から、作動ロッド１６が一方向へ作動してニードル弁体１５が弁室７側へストロークすると、図２に示すようにニードル弁体１５がオリフィス孔１３に深く差し込まれてニードル弁体１５のテーパー部１５ｂがオリフィス孔１３内に位置する。したがってオリフィス流路１７の流路断面積が徐々に減少し、流量も徐々に減少する（図５のグラフ図におけるポイントＰ２）。 When the operating rod 16 moves in one direction and the needle valve body 15 strokes toward the valve chamber 7 from the state of the initial movement, the needle valve body 15 is deeply inserted into the orifice hole 13 as shown in FIG. A tapered portion 15 b of the valve body 15 is positioned within the orifice hole 13 . Therefore, the channel cross-sectional area of the orifice channel 17 gradually decreases, and the flow rate also gradually decreases (point P2 in the graph of FIG . 5).

ついで、作動ロッド１６が更に一方向へ作動してニードル弁体１５が更に弁室７側へストロークすると、図３に示すようにニードル弁体１５の後端部１５ｃがオリフィス弁座１４に接触し着座する。したがってオリフィス流路１７が閉塞され、流量が一旦、零となる（図５のグラフ図におけるポイントＰ３）。 Then, when the operating rod 16 moves further in one direction and the needle valve body 15 further strokes toward the valve chamber 7, the rear end portion 15c of the needle valve body 15 comes into contact with the orifice valve seat 14 as shown in FIG. take a seat. Therefore, the orifice flow path 17 is blocked and the flow rate temporarily becomes zero (point P 3 in the graph of FIG. 5).

ついで、作動ロッド１６が更に一方向へ作動してニードル弁体１５が更に弁室７側へストロークすると、図４に示すようにニードル弁体１５の後端部１５ｃがスプリングカバー１０を押圧して変位させる。したがって弁体９が弁座８から離れ、内部弁１２が開弁し、弁体９および弁座８間の流体流路（外側流路）１８が開放され、この流体流路１８を経由して流体が流入ポート３から流出ポート４へ流通する。このときの作動は、内部弁１２がニードル弁構造ではなくリフト弁構造とされているため、流量が大流量とされる。またニードル弁体１５のストローク量に応じて弁体９のストローク量が増大し、流体流路１８の流路断面積が増大するので、ニードル弁体１５のストローク量に応じて流量が増大することになる（図５のグラフ図におけるポイントＰ３～ポイントＰ４）。 Then, when the operating rod 16 moves further in one direction and the needle valve body 15 further strokes toward the valve chamber 7, the rear end portion 15c of the needle valve body 15 presses the spring cover 10 as shown in FIG. Displace. Therefore, the valve body 9 is separated from the valve seat 8, the internal valve 12 is opened, the fluid flow path (outer flow path) 18 between the valve body 9 and the valve seat 8 is opened, and Fluid flows from the inflow port 3 to the outflow port 4 . At this time, the flow rate is large because the internal valve 12 has a lift valve structure instead of a needle valve structure. Further, the stroke amount of the valve body 9 increases according to the stroke amount of the needle valve body 15, and the cross-sectional area of the fluid flow path 18 increases. (point P 3 to point P 4 in the graph diagram of FIG. 5).

上記構成の流量制御弁１では、初動時の状態からオリフィス流路１７が閉塞されて流量が一旦、零となる状態までの領域（図５のグラフ図におけるポイントＰ１～ポイントＰ３）が小流量域とされ、それ以降の領域（図５のグラフ図におけるポイントＰ３～ポイントＰ４）が大流量域とされる。 In the flow control valve 1 configured as described above, the region (points P 1 to P 3 in the graph of FIG. 5) from the initial operation state to the state where the orifice passage 17 is blocked and the flow rate temporarily becomes zero is small. The region after that (point P 3 to point P 4 in the graph of FIG. 5) is defined as the large flow region.

したがって、小流量域ではニードル弁構造が作動するため、小流量域で流量を精度良く制御することができ、大流量域ではリフト弁構造が作動するため、大流量域でも流量を制御することができる流量制御弁１を提供することができる。 Therefore, since the needle valve structure operates in the small flow region, it is possible to control the flow accurately in the small flow region, and since the lift valve structure operates in the large flow region, it is possible to control the flow even in the large flow region. It is possible to provide a flow control valve 1 capable of

１ 流量制御弁
２ ボディ
３ 流入ポート
４ 流出ポート
５ 仕切り壁
６ 弁孔
７ 弁室
８ 弁座
９ 弁体
１０ スプリングカバー
１１ スプリング
１２ 内部弁
１３ オリフィス孔
１４ オリフィス弁座
１５ ニードル弁体
１５ａ 先端部
１５ｂ テーパー部
１５ｃ 後端部
１６ 作動ロッド
１７ オリフィス流路
１８ 流体流路 Reference Signs List 1 flow control valve 2 body 3 inflow port 4 outflow port 5 partition wall 6 valve hole 7 valve chamber 8 valve seat 9 valve body 10 spring cover 11 spring 12 internal valve 13 orifice hole 14 orifice valve seat 15 needle valve body 15a tip portion 15b Tapered portion 15c Rear end 16 Actuating rod 17 Orifice channel 18 Fluid channel

Claims (2)

流入ポートおよび流出ポートを設け、前記両ポート間に弁孔を設けたボディを備え、
前記ボディの内部で前記流入ポートに通じる弁室側で前記弁孔の周縁部に設けられた弁座と、
前記弁室内に位置して、前記弁座に接離可能に着座する弁体と、
前記弁体を保持し、前記弁体と共に前記ボディ内で変位可能とされたスプリングカバーと、
前記弁体が前記弁座に着座する方向に前記スプリングカバーを弾性付勢するスプリングと、
で構成されるリフト弁構造を有する内部弁と、
前記スプリングカバーに設けられたオリフィス孔と、
前記オリフィス孔の前記弁孔側の開口周縁部に設けられたオリフィス弁座と、
前記オリフィス孔に前記弁孔側から差し込まれ、前記弁室に近づく方向と遠ざかる方向とに往復動するニードル弁体と、
駆動源に接続され、前記駆動源に駆動されて前記弁室と反対側から前記ニードル弁体を変位させる作動ロッドと、
を備え、
前記ニードル弁体は、前記弁室側を向いた先端側に、
前記オリフィス孔の内径よりも小径で、前記オリフィス孔内に位置するときに前記オリフィス孔の内面との間にオリフィス流路を形成する先端部と、
前記作動ロッドの作動にしたがい前記ニードル弁体が前記弁室側へストロークしたときに前記オリフィス弁座に着座する段差状の後端部と、
前記先端部から径寸法を徐々に拡大し、前記オリフィス孔に嵌り合う径寸法になるとその径寸法のまま延びて前記後端部に連絡する部分と、
を備え、
前記内部弁は、前記オリフィス弁座に着座した前記ニードル弁体が前記弁室側へストロークして前記スプリングカバーを押圧し変位させることによって開弁することを特徴とする流量制御弁。 a body provided with an inflow port and an outflow port, and a valve hole provided between the two ports;
a valve seat provided on the peripheral edge of the valve hole on the side of the valve chamber communicating with the inflow port inside the body;
a valve body positioned in the valve chamber and removably seated on the valve seat;
a spring cover that holds the valve body and is displaceable within the body together with the valve body;
a spring that elastically biases the spring cover in a direction in which the valve body is seated on the valve seat;
an internal valve having a lift valve structure consisting of
an orifice hole provided in the spring cover;
an orifice valve seat provided at the opening peripheral edge of the orifice hole on the valve hole side;
a needle valve body that is inserted into the orifice from the valve hole side and reciprocates in a direction toward and away from the valve chamber ;
an operating rod connected to a drive source and driven by the drive source to displace the needle valve body from the side opposite to the valve chamber;
with
The needle valve body has a distal end side facing the valve chamber side,
a tip portion having a smaller diameter than the inner diameter of the orifice hole and forming an orifice flow path between itself and the inner surface of the orifice hole when positioned within the orifice hole;
a stepped rear end portion that is seated on the orifice valve seat when the needle valve body strokes toward the valve chamber in accordance with the actuation of the operating rod;
a portion whose diameter is gradually increased from the front end portion and, when the diameter size fits into the orifice hole, is extended to communicate with the rear end portion;
with
A flow rate control valve, wherein the internal valve is opened by the needle valve body seated on the orifice valve seat making a stroke toward the valve chamber to press and displace the spring cover. 請求項１記載の流量制御弁において、
前記ニードル弁体は、前記先端部から径寸法が徐々に拡大する形状の部分をテーパー部としている、ことを特徴とする流量制御弁。 The flow control valve according to claim 1,
The flow control valve, wherein the needle valve element has a tapered portion in which the diameter dimension gradually increases from the tip portion.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004211772A (en) 2002-12-27 2004-07-29 Noritz Corp Flow rate adjusting device and combustion device
JP2014092144A (en) 2012-11-07 2014-05-19 Aisan Ind Co Ltd Exhaust gas reflux valve
WO2017148621A1 (en) 2016-03-03 2017-09-08 Otto Egelhof Gmbh & Co. Kg Control valve and method for controlling such a control valve for a fluid circuit
JP2017227265A (en) 2016-06-22 2017-12-28 株式会社鷺宮製作所 Electric operated valve

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JPS61105374A (en) * 1984-10-29 1986-05-23 Nippon Fuirukon Kk Automatic changeover valve for filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004211772A (en) 2002-12-27 2004-07-29 Noritz Corp Flow rate adjusting device and combustion device
JP2014092144A (en) 2012-11-07 2014-05-19 Aisan Ind Co Ltd Exhaust gas reflux valve
WO2017148621A1 (en) 2016-03-03 2017-09-08 Otto Egelhof Gmbh & Co. Kg Control valve and method for controlling such a control valve for a fluid circuit
JP2017227265A (en) 2016-06-22 2017-12-28 株式会社鷺宮製作所 Electric operated valve

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