JP2009074656A - Constant flow rate valve with checking function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant flow rate valve with a checking function that is reduced in size and cost, wherein a constant flow rate valve and a check valve are incorporated integrally with each other. <P>SOLUTION: The constant flow rate valve 1 with a checking function includes a valve casing 10, a valve element 20, a compression spring 30 for making the flow rate constant, a checking compression spring 40, C-shaped retaining rings 50, 51 and guides 55, 56. The compression spring 30 for making the flow rate constant and the checking compression spring 40 are spring members for urging the valve element 20 to the upstream side. The compression spring 30 for making the flow rate constant is arranged spacedly from the checking compression spring 40 so that only the checking compression spring 40 having a small spring constant operates when water does not pass. As the pressure of the fluid becomes larger and the valve element 20 moves toward the downstream side, a gap between a small-diameter portion 16 of the valve casing 10 and a tapered portion 21 of the valve element 20 for making the flow rate constant becomes smaller so that the flow rate is kept constant. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、流体の流量を一定に保つための定流量弁に関し、特に、逆止弁の機能も併せ持つ定流量弁に関する。   The present invention relates to a constant flow valve for keeping a fluid flow rate constant, and more particularly to a constant flow valve that also has a check valve function.

従来から、流体の安定供給や有効利用等のために、一次側（流体供給側）の圧力が変動しても流量を一定に保つための定流量弁が提供されており、例えば、家庭の配水管や蒸気ボイラの給水系統等において定流量弁が使用されている。   Conventionally, constant flow valves have been provided to keep the flow rate constant even when the pressure on the primary side (fluid supply side) fluctuates, for the stable supply and effective use of fluids. Constant flow valves are used in water pipes and steam boiler water supply systems.

また、流体の逆流を防止するための逆止弁も多数提供されており、家庭の配水管や蒸気ボイラの給水系統等において上記定流量弁と共に使用されることも多い。ところで、従来は、定流量弁と逆止弁をそれぞれ用意して、別々に配管に設置しているため、広い設置場所を確保する必要があり、コストが高くなってしまうという問題があった。   Many check valves for preventing the back flow of fluid are also provided, and they are often used together with the constant flow valves in household water distribution pipes, steam boiler water supply systems, and the like. By the way, conventionally, since a constant flow valve and a check valve are separately prepared and separately installed on the pipe, it is necessary to secure a wide installation place, and there is a problem that the cost increases.

そこで、定流量弁と逆止弁を一体に構成した逆止機能付きの定流量弁が、下記特許文献１において開示されている。
特開２００５−１６３８２３号公報 Accordingly, a constant flow valve with a check function in which a constant flow valve and a check valve are integrally formed is disclosed in Patent Document 1 below.
JP 2005-163823 A

上記特許文献１では、流体の通過する流入口及び流出口が形成されたケース内に、変形によって流量を調整する下流側弾性部材と、流入口を封止するための上流側弾性部材と、下流側弾性部材を介して上流側弾性部材を流入口に押しつける圧縮バネを設置することで、定流量弁と逆止弁を一体化している。   In Patent Document 1, a downstream elastic member that adjusts the flow rate by deformation, an upstream elastic member for sealing the inflow port, and a downstream in a case in which an inlet and an outlet through which a fluid passes are formed. The constant flow valve and the check valve are integrated by installing a compression spring that presses the upstream elastic member against the inlet through the side elastic member.

ところが、上記逆止機能付き定流量弁では、流量の調整を弾性部材の変形により行い、逆止機能を圧縮バネの付勢力により弾性部材を流入口に押しつけることで行っており、流量調整機能と逆止機能とを独立した別々の手段により実現しているため、部品点数が増え、低コスト化、小型化には限界があった。   However, in the constant flow valve with a check function, the flow rate is adjusted by deformation of the elastic member, and the check function is performed by pressing the elastic member against the inlet by the biasing force of the compression spring. Since the check function is realized by independent means, the number of parts is increased, and there is a limit to cost reduction and miniaturization.

また、上記逆止機能付き定流量弁の流量調整機能は、弾性部材の変形により実現されているため、弾性部材が予想外に変形してしまうことで、流量の調整が安定しない可能性がある。   Further, since the flow rate adjustment function of the constant flow valve with a check function is realized by deformation of the elastic member, the elastic member may be deformed unexpectedly, and thus the flow rate adjustment may not be stable. .

本発明は、このような課題を解決するためになされたものであり、定流量弁と逆止弁を一体化した逆止機能付き定流量弁であって、小型化、低コスト化に適した逆止機能付き定流量弁を提供することを目的とする。   The present invention has been made to solve such problems, and is a constant flow valve with a check function in which a constant flow valve and a check valve are integrated, and is suitable for downsizing and cost reduction. An object of the present invention is to provide a constant flow valve with a check function.

上記課題を解決するために、本発明に係る逆止機能付き定流量弁は、流量を一定に保つための逆止機能付き定流量弁において、流体が流れる流路を内部に有する弁箱と、前記弁箱の流路に軸方向に往復移動可能に設置された弁体であって、軸方向に移動することで前記弁箱の流路内壁との隙間を変化させて流路断面積を変化させる定流量用弁部と、前記弁箱の流路内壁と接触して逆止弁として作用する逆止用弁部と、を有する弁体と、前記弁体を上流側へ付勢するバネ部材であって、非通水時に前記逆止用弁部を前記弁箱の流路内壁に圧接させて逆止弁を閉じた状態とするバネ部材と、を備えることを特徴とする。   In order to solve the above problems, a constant flow valve with a check function according to the present invention is a constant flow valve with a check function for keeping the flow rate constant, a valve box having a flow path through which a fluid flows, A valve element installed in the flow path of the valve box so as to be capable of reciprocating in the axial direction, and moving in the axial direction changes the gap with the inner wall of the flow path of the valve box to change the cross-sectional area of the flow path. A valve body having a constant flow valve section, a check valve section acting as a check valve in contact with the flow path inner wall of the valve box, and a spring member for biasing the valve body upstream And a spring member that closes the check valve by bringing the check valve portion into pressure contact with the inner wall of the flow path of the valve box when water is not flowing.

本発明に係る逆止機能付き定流量弁によれば、定流量弁と逆止弁を一体化した逆止機能付き定流量弁であって、小型化、低コスト化に適した逆止機能付き定流量弁を提供することができる。   The constant flow valve with a check function according to the present invention is a constant flow valve with a check function that integrates a constant flow valve and a check valve, and has a check function suitable for downsizing and cost reduction. A constant flow valve can be provided.

以下、図面を参照しながら、本発明の実施形態について詳細に説明する。まず、図１〜図４に基づいて、本実施形態に係る逆止機能付き定流量弁の構成について説明する。図１は、本実施形態に係る逆止機能付き定流量弁の構成を示す断面図である。図２は、本実施形態に係る逆止機能付き定流量弁を構成する部品の展開図である。図３は、本実施形態に係る弁箱の構成を示す断面図である。図４は、本実施形態に係る弁体の構成を示す正面図である。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, based on FIGS. 1-4, the structure of the constant flow valve with a check function which concerns on this embodiment is demonstrated. FIG. 1 is a cross-sectional view illustrating a configuration of a constant flow valve with a check function according to the present embodiment. FIG. 2 is a development view of components constituting the constant flow valve with a check function according to the present embodiment. FIG. 3 is a cross-sectional view showing the configuration of the valve box according to the present embodiment. FIG. 4 is a front view showing the configuration of the valve body according to the present embodiment.

図１及び図２に示すように、本実施形態に係る逆止機能付き定流量弁１は、弁箱１０、弁体２０、定流量用圧縮バネ３０、逆止用圧縮バネ４０、Ｃ形止め輪５０，５１及びガイド５５，５６を備えている。   As shown in FIGS. 1 and 2, the constant flow valve 1 with a check function according to this embodiment includes a valve box 10, a valve body 20, a constant flow compression spring 30, a check compression spring 40, and a C-shaped stop. Wheels 50 and 51 and guides 55 and 56 are provided.

弁箱１０は、内部に流路を有する弁本体を構成するステンレス製の円筒形状の部材である。図３に示すように、弁箱１０は、上流側の配管と接続される入口側接続部１１、下流側の配管と接続される出口側接続部１２とを有しており、図中左から右へ流体が通過するように構成されている。   The valve box 10 is a cylindrical member made of stainless steel that constitutes a valve body having a flow path inside. As shown in FIG. 3, the valve box 10 has an inlet side connection portion 11 connected to the upstream side piping, and an outlet side connection portion 12 connected to the downstream side piping, from the left in the figure. The fluid is configured to pass to the right.

弁箱１０の中央付近には上流側から下流側に向けて流路の内径が徐々に大きくなるテーパ部（シール面）１５が形成されている。また、テーパ部１５の上流側に隣接して、流量を規制するために内径が小さく絞られた小径部（オリフィス）１６が形成されている。   Near the center of the valve box 10, a tapered portion (seal surface) 15 is formed in which the inner diameter of the flow path gradually increases from the upstream side toward the downstream side. In addition, a small-diameter portion (orifice) 16 whose inner diameter is narrowed to restrict the flow rate is formed adjacent to the upstream side of the tapered portion 15.

弁体２０は、弁箱１０内に同軸に配置されるステンレス製の棒状のピン部材であり、図４に示すように、両端の小径の軸部２４よりも径が大きい中央付近の大径部２３には、上流側（図中左側）に、上流側から下流側に向けて径の小さくなる定流量用テーパ部（定流量用弁部）２１が形成されている。また、大径部２３の定流量用テーパ部２１の下流側に隣接して、上流側から下流側に向けて径の大きくなる逆止用テーパ部（逆止用弁部）２２が形成されている。また、逆止用テーパ部２２の中程には、リング溝が形成されており、このリング溝には、逆止用のＯリング２５が装着されている。   The valve body 20 is a stainless steel rod-shaped pin member disposed coaxially in the valve box 10 and, as shown in FIG. 4, a large-diameter portion near the center having a larger diameter than the small-diameter shaft portions 24 at both ends. 23 has a constant flow rate taper portion (constant flow rate valve portion) 21 whose diameter decreases from the upstream side toward the downstream side on the upstream side (left side in the figure). In addition, a check taper portion (check valve portion) 22 whose diameter increases from the upstream side to the downstream side is formed adjacent to the downstream side of the constant flow taper portion 21 of the large diameter portion 23. Yes. Further, a ring groove is formed in the middle of the check taper portion 22, and a check O-ring 25 is mounted in the ring groove.

詳細は後述するが、弁箱１０の小径部１６と、弁体２０の定流量用弁部としての定流量用テーパ部２１との隙間の大きさが変化することで、流量が調整される。また、弁箱１０のテーパ部１５と、弁体２０の逆止用弁部としての逆止用テーパ部２２に設置されたＯリング２５との接触により逆止機能が実現される。   Although details will be described later, the flow rate is adjusted by changing the size of the gap between the small diameter portion 16 of the valve box 10 and the constant flow rate taper portion 21 as the constant flow rate valve portion of the valve body 20. Further, the check function is realized by contact between the taper portion 15 of the valve box 10 and the O-ring 25 installed in the check taper portion 22 as the check valve portion of the valve body 20.

また、とくに本実施形態では、弁箱１０のテーパ部１５のテーパ角と、弁体２０の逆止用テーパ部２２のテーパ角が同じ角度に設定されており、テーパ部１５と逆止用テーパ部２２の表面が互いに平行に位置している。このため、Ｏリング２５が劣化等によって機能しなくなっても、テーパ部１５と逆止用テーパ部２２の表面が接触することで、逆止機能を担保することが可能である。   In the present embodiment, in particular, the taper angle of the taper portion 15 of the valve box 10 and the taper angle of the check taper portion 22 of the valve body 20 are set to the same angle. The surfaces of the portions 22 are positioned parallel to each other. For this reason, even if the O-ring 25 does not function due to deterioration or the like, it is possible to ensure the check function by contacting the surfaces of the taper portion 15 and the check taper portion 22.

ガイド５５，５６は、弁体２０が軸方向に往復移動可能なように、弁体２０の両端の軸部２４を支持する環状部材であり、弁箱１０内の上流側にガイド５５、下流側にガイド５６が設置されている。ガイド５５，５６の中央に設けられた小孔内に弁体２０の両側の軸部２４が支持される。ガイド５５，５６の小孔の径は、弁体２０の軸部２４の径よりも大きく、弁体２０の中央付近の大径部２３の径よりも小さく形成されている。ガイド５５，５６の設置間隔は、弁体２０の軸方向の長さよりも短く、大径部２３の軸方向長さよりも長い。よって、弁体２０は、軸部２４において、ガイド５５，５６に案内されて軸方向に往復移動可能に且つ抜けないように支持されることになる。   The guides 55 and 56 are annular members that support the shaft portions 24 at both ends of the valve body 20 so that the valve body 20 can reciprocate in the axial direction. A guide 56 is installed. The shaft portions 24 on both sides of the valve body 20 are supported in a small hole provided in the center of the guides 55 and 56. The diameters of the small holes of the guides 55 and 56 are larger than the diameter of the shaft portion 24 of the valve body 20 and smaller than the diameter of the large diameter portion 23 near the center of the valve body 20. The installation interval between the guides 55 and 56 is shorter than the axial length of the valve body 20 and longer than the axial length of the large diameter portion 23. Therefore, the valve body 20 is guided by the guides 55 and 56 in the shaft portion 24 so as to be able to reciprocate in the axial direction and not to come off.

Ｃ形止め輪５０，５１は、それぞれガイド５５，５６の外側に隣接して、弁箱１０の内壁に設けられたリング状溝内に嵌合設置される。このＣ形止め輪５０，５１により、ガイド５５，５６が軸方向に移動しないように弁箱１０に固定される。Ｃ形止め輪５０，５１は、それぞれ入口側接続部１１及び出口側接続部１２から弁箱１０の流路内に挿入され、上記リング状溝内に嵌め込まれて固定される。   The C-shaped retaining rings 50 and 51 are fitted and installed in ring-shaped grooves provided on the inner wall of the valve box 10 adjacent to the outside of the guides 55 and 56, respectively. The C-shaped retaining rings 50 and 51 are fixed to the valve box 10 so that the guides 55 and 56 do not move in the axial direction. The C-shaped retaining rings 50 and 51 are inserted into the flow path of the valve box 10 from the inlet side connecting portion 11 and the outlet side connecting portion 12, respectively, and are fitted into the ring-shaped groove and fixed.

定流量用圧縮バネ３０（第２バネ部材）は、定流量を実現するために、流路内を流れる流体の圧力によって下流側に移動する弁体２０を弾性力によって上流側に押し戻すことで、弁箱１０の小径部１６と弁体２０の定流量用テーパ部２１との隙間を調整する。   The constant flow compression spring 30 (second spring member) pushes the valve body 20 moving downstream by the pressure of the fluid flowing in the flow path back to the upstream side by an elastic force in order to realize a constant flow rate, The clearance between the small diameter portion 16 of the valve box 10 and the constant flow taper portion 21 of the valve body 20 is adjusted.

逆止用圧縮バネ４０（第１バネ部材）は、流体の逆流を防止するために、常時、弁体２０を上流側に付勢するように設置されており、流体が流れていない非通水時（定常状態）では、Ｏリング２５を弁箱１０のテーパ部１５に圧接して、逆止弁を閉じた状態とし、逆止を実現している。   The check compression spring 40 (first spring member) is installed so as to constantly urge the valve body 20 to the upstream side in order to prevent the backflow of the fluid, and is not water-permeable. At the time (steady state), the O-ring 25 is pressed against the tapered portion 15 of the valve box 10 to close the check valve, thereby realizing the check.

ここで、定流量用圧縮バネ３０の自由高さは14mm、バネ定数は0.53N/mm、逆止用圧縮バネ４０の自由高さは20mm、バネ定数は0.0709N/mmであり、定流量用圧縮バネ３０のほうが短く、バネ定数は大きい。   Here, the free height of the constant flow compression spring 30 is 14 mm, the spring constant is 0.53 N / mm, the free height of the check compression spring 40 is 20 mm, and the spring constant is 0.0709 N / mm. The compression spring 30 is shorter and has a larger spring constant.

また、逆止用圧縮バネ４０は、逆止用テーパ部２２の下流側端面２７とガイド５６との間に保持され、定流量用圧縮バネ３０は、上記端面２７の下流側に位置する端面２８とガイド５６との間に保持される。逆止弁が閉じた状態である非通水時の端面２７とガイド５６との距離は、逆止用圧縮バネ４０の自由高さよりも短く、非通水時においても、逆止用圧縮バネ４０は付勢力を発揮している。一方、非通水時の端面２８とガイド５６との距離は、定流量用圧縮バネ３０の自由高さよりも長くなるように設計されており、定流量用圧縮バネ３０の取り付け状態では、逆止用テーパ部２２、すなわち逆止用弁部に対して隙間が形成されている。よって、定流量用圧縮バネ３０は、非通水時には、付勢力を発揮していない自由状態にある。もちろん、定流量用圧縮バネ３０は、ガイド５６との間に隙間を形成するように配置しても良い。   The non-return compression spring 40 is held between the downstream end surface 27 of the non-return taper portion 22 and the guide 56, and the constant flow compression spring 30 is the end surface 28 positioned on the downstream side of the end surface 27. And the guide 56. The distance between the end face 27 and the guide 56 when the check valve is in a closed state is shorter than the free height of the check compression spring 40. Is exerting its power. On the other hand, the distance between the end face 28 and the guide 56 when not passing water is designed to be longer than the free height of the constant flow compression spring 30. A gap is formed with respect to the tapered portion 22, that is, the check valve portion. Therefore, the constant flow compression spring 30 is in a free state in which no urging force is exerted when water is not flowing. Of course, the constant flow compression spring 30 may be disposed so as to form a gap with the guide 56.

このように、非通水時には、定流量用圧縮バネ３０の端末は、少なくとも端面２８との間又はガイド５６との間に隙間が生じているため、上流側から流体が逆止機能付き定流量弁１内に流れ込んでくる開弁時には、定流量用圧縮バネ３０よりもバネ定数の小さい逆止用圧縮バネ４０だけが作用し、定流量用圧縮バネ３０は作用しないことになる。開弁後、流体の圧力に押されて徐々に弁体２０が下流側に移動し、定流量用圧縮バネ３０の設置隙間が無くなると、定流量用圧縮バネ３０も作用し始め、弁体２０を上流側に押し戻すように働くことになる。   Thus, when there is no water flow, a gap is formed at least between the end face 28 or the guide 56 at the end of the constant flow compression spring 30, so that the fluid flows from the upstream side with a check function. When the valve flows into the valve 1, only the check compression spring 40 having a spring constant smaller than that of the constant flow compression spring 30 acts, and the constant flow compression spring 30 does not act. After opening the valve, the valve body 20 is gradually moved downstream by the pressure of the fluid, and when the installation clearance of the constant flow compression spring 30 disappears, the constant flow compression spring 30 also starts to act, and the valve body 20 It works to push back to the upstream side.

また、弁箱１０の小径部１６に対向して位置する弁体２０の定流量用テーパ部２１は、上述したように、上流側から下流側に向けて径が小さくなる形状を有している。そして、弁体２０が最も上流側に寄った状態（弁が閉じた状態）のときに、径の小さい部分が小径部１６に位置するように構成されている。定流量用テーパ部２１の径が小さければ、小径部１６との間の隙間が大きく、流体の通過領域（流路断面積）が大きくなり、径が大きければ、同隙間が小さく、通過領域（流路断面積）が小さくなる。   Further, as described above, the constant flow rate taper portion 21 of the valve body 20 positioned facing the small diameter portion 16 of the valve box 10 has a shape whose diameter decreases from the upstream side toward the downstream side. . And when the valve body 20 is in the state closest to the upstream side (the valve is closed), the small diameter portion is positioned in the small diameter portion 16. If the diameter of the constant flow rate taper portion 21 is small, the gap between the small diameter portion 16 is large and the fluid passage region (flow passage cross-sectional area) is large. If the diameter is large, the gap is small and the passage region ( (Channel cross-sectional area) is reduced.

弁が閉じた状態から、流体の圧力が大きくなり、弁体２０が下流側に移動すると、小径部１６に位置する定流量用弁部としての定流量用テーパ部２１の径が段々と太くなり、隙間が小さくなるので、流路断面積が小さくなる。一方、弁体２０が下流側に移動するにつれて、各圧縮バネ３０，４０の弾性力も大きくなり、これら弾性力と、一次（入口）側の水圧と二次（出口）側の水圧との差圧とが釣り合う位置で、弁体２０は停止する。   When the pressure of the fluid increases from the state where the valve is closed and the valve body 20 moves downstream, the diameter of the constant flow taper portion 21 as the constant flow valve portion located in the small diameter portion 16 gradually increases. Since the gap is reduced, the cross-sectional area of the flow path is reduced. On the other hand, as the valve body 20 moves downstream, the elastic force of the compression springs 30 and 40 also increases, and the difference between the elastic force and the water pressure on the primary (inlet) side and the water pressure on the secondary (outlet) side. The valve body 20 stops at a position where the two are balanced.

ここで、弁体２０が下流側に移動するにつれて、差圧が大きくなっているが、反対に小径部１６における流路断面積が小さくなるので、定流量弁１内を通過する流量は一定に保たれることになる。   Here, as the valve body 20 moves downstream, the differential pressure increases. On the contrary, the flow passage cross section in the small diameter portion 16 decreases, so that the flow rate passing through the constant flow valve 1 is constant. Will be kept.

本実施形態において、逆止弁を開けるときに作用する逆止用圧縮バネ４０のバネ定数を小さくしたのは、本実施形態に係る逆止機能付き定流量弁１では、流体の圧力が小さい場合でも弁が開くことが望ましいからである。但し、開弁後も流体の圧力に抗して弁体２０を押し戻す圧縮バネの弾性力が弱いままだと、流体の圧力に負けて弁体２０を押し返すことができず、定流量調整が出来なくなってしまう。よって、本実施形態では、逆止弁が開いた後に作用する、バネ定数の大きい定流量用圧縮バネ３０をさらに設置している。   In the present embodiment, the spring constant of the check compression spring 40 that acts when the check valve is opened is reduced when the fluid pressure is small in the constant flow valve 1 with the check function according to the present embodiment. But it is desirable for the valve to open. However, if the elastic force of the compression spring that pushes back the valve body 20 against the fluid pressure remains weak even after the valve is opened, the valve body 20 cannot be pushed back against the fluid pressure, and the constant flow rate can be adjusted. It will disappear. Therefore, in this embodiment, the constant flow compression spring 30 having a large spring constant that acts after the check valve is opened is further installed.

このように、バネ定数の異なる２つのバネを用い、逆止弁が閉じた状態では第１の圧縮バネのみを作用させ、逆止弁が開いた後から作用する第２の圧縮バネをさらに設置しておけば、第１及び第２圧縮バネのバネ定数を調整することで、様々な用途に適した逆止機能付き定流量弁を構成することができる。   As described above, two springs having different spring constants are used, and when the check valve is closed, only the first compression spring is operated, and a second compression spring that is operated after the check valve is opened is further installed. In this case, by adjusting the spring constants of the first and second compression springs, a constant flow valve with a check function suitable for various applications can be configured.

もちろん、バネ定数の設定は、本実施形態のように逆止用圧縮バネのバネ定数が小さい場合だけでなく、逆止機能付き定流量弁が設置される系で求められる性能に適応させるべく、適宜、両方同じバネ定数にしても良いし、第２の圧縮バネのバネ定数を小さく設定しても良い。また、設置される環境によっては、一本の圧縮バネで、逆止用と定流量用の双方を兼用させることも可能である。   Of course, the setting of the spring constant is not limited to the case where the spring constant of the compression spring for check is small as in this embodiment, but to adapt to the performance required in the system where the constant flow valve with check function is installed, If necessary, both may have the same spring constant, or the spring constant of the second compression spring may be set small. In addition, depending on the installation environment, it is possible to use both a non-return and a constant flow rate with a single compression spring.

さらに、図１等に示すように、圧縮バネ３０，４０はコイルバネであり、定流量用圧縮バネ３０の外径よりも逆止用圧縮バネ４０の内径のほうが大きく、逆止用圧縮バネ４０の内側に定流量用圧縮バネ３０が同軸に設置されている。具体的には、棒状の弁体２０の逆止用テーパ部２２よりも下流側が、定流量用圧縮バネ３０の内部を軸方向に貫挿しており、弁体２０の軸部２４等を覆って配置されたこの定流量用圧縮バネ３０が、さらに逆止用圧縮バネ４０で覆われている。   Further, as shown in FIG. 1 and the like, the compression springs 30 and 40 are coil springs, and the inner diameter of the non-return compression spring 40 is larger than the outer diameter of the constant flow compression spring 30. A constant flow compression spring 30 is coaxially installed inside. Specifically, the downstream side of the checkered taper portion 22 of the rod-shaped valve body 20 penetrates the inside of the constant flow compression spring 30 in the axial direction, and covers the shaft portion 24 and the like of the valve body 20. The arranged constant flow compression spring 30 is further covered with a check compression spring 40.

このように、各圧縮バネ３０，４０を同軸に重ねて配置することで、逆止機能付き定流量弁１を小型化することができ、圧縮バネを別々に配置する場合に比べて部品点数を減らすこともできるので、低コスト化も実現できる。もちろん、本実施形態とは逆に、バネ定数の大きい定流量用圧縮バネ３０を外側に配置し、バネ定数の小さい逆止用圧縮バネ４０を外側に配置するように構成しても良い。   Thus, by arranging the compression springs 30 and 40 on the same axis, the constant flow valve 1 with a check function can be reduced in size, and the number of parts can be reduced compared to the case where the compression springs are separately arranged. Since it can be reduced, the cost can be reduced. Of course, contrary to the present embodiment, the constant flow compression spring 30 having a large spring constant may be disposed outside, and the non-return compression spring 40 having a small spring constant may be disposed outside.

以上、本実施形態に係る逆止機能付き定流量弁１の構成について詳細に説明したが、続いて、逆止機能付き定流量弁１の作用について、図面を参照しながら説明する。図５は、本実施形態に係る逆止機能付き定流量弁１の動作状態を示す図であり、図５（ａ）は、逆止機能付き定流量弁の非通水時の状態を示す図、図５（ｂ）は、逆止機能付き定流量弁の開弁時の状態を示す図、図５（ｃ）は、逆止機能付き定流量弁の通水時の状態を示す図である。   As mentioned above, although the structure of the constant flow valve 1 with a check function which concerns on this embodiment was demonstrated in detail, the effect | action of the constant flow valve 1 with a check function is demonstrated referring drawings. FIG. 5 is a view showing an operating state of the constant flow valve 1 with a check function according to the present embodiment, and FIG. 5A is a view showing a state when the constant flow valve with a check function is not passing water. FIG. 5B is a view showing a state when the constant flow valve with a check function is opened, and FIG. 5C is a view showing a state when the constant flow valve with a check function is flowing. .

図５（ａ）に示すように、定常状態である非通水時には、流体が流れていないため、圧縮バネによる弾性力が働くだけであるが、上述したように、定流量用圧縮バネ３０は逆止用テーパ部２２、すなわち逆止用弁部に対して隙間を空けて設置されているため、逆止用圧縮バネ４０だけが働いている。この逆止用圧縮バネ４０だけによる弾性力により、逆止用テーパ部２２のＯリング２５が弁箱１０のテーパ部１５に圧接され、逆止弁が閉じた状態となっている。   As shown in FIG. 5 (a), at the time of non-water passage in a steady state, no fluid flows, so only the elastic force is exerted by the compression spring. As described above, the constant flow compression spring 30 is Since the check taper portion 22, that is, the check valve portion is provided with a gap, only the check compression spring 40 works. Due to the elastic force of only the check compression spring 40, the O-ring 25 of the check taper portion 22 is pressed against the taper portion 15 of the valve box 10, and the check valve is closed.

逆止用圧縮バネ４０のバネ定数は、上述したように、定流量用圧縮バネ３０のバネ定数よりも小さいため、比較的弱い弾性力により、弁が閉じられていることになる。続いて、流体が流れ始めると、流体の圧力が弁にかかり、一次（入口）側の圧力と二次（出口）側の圧力との差圧による力が、逆止用圧縮バネ４０の弾性力を越えると、弁体２０が徐々に下流側へと動き始め、閉じられていた弁が開く。   Since the spring constant of the check compression spring 40 is smaller than the spring constant of the constant flow compression spring 30 as described above, the valve is closed by a relatively weak elastic force. Subsequently, when the fluid starts to flow, the pressure of the fluid is applied to the valve, and the force due to the differential pressure between the primary (inlet) side pressure and the secondary (outlet) side pressure is the elastic force of the check compression spring 40. The valve body 20 gradually starts to move downstream, and the closed valve is opened.

図５（ｂ）に示すように、逆止弁が開いた状態では、Ｏリング２５が弁箱１０のテーパ部１５から離れており、入口側から入ってくる流体は、小径部１６と定流量用テーパ部２２との隙間、Ｏリング２５とテーパ部１５との隙間を通過して、出口側へと抜けていく。   As shown in FIG. 5B, in the state where the check valve is opened, the O-ring 25 is separated from the tapered portion 15 of the valve box 10, and the fluid entering from the inlet side is in contact with the small diameter portion 16 and the constant flow rate. It passes through the gap between the taper portion 22 and the gap between the O-ring 25 and the taper portion 15, and then exits toward the outlet side.

流体の圧力が大きくなり、弁体２０が定流量用圧縮バネ３０の設置隙間以上に下流側へ移動すると、定流量用圧縮バネ３０の両端末が端面２８及びガイド５６に接触することになり、定流量用圧縮バネ３０の弾性力も作用し始める。定流量用圧縮バネ３０のバネ定数は、逆止用圧縮バネ４０よりも充分に大きいため、より大きな弾性力が弁体２０に作用することになり、弁体２０の下流側への移動が抑えられる。   When the pressure of the fluid increases and the valve body 20 moves downstream beyond the installation clearance of the constant flow compression spring 30, both ends of the constant flow compression spring 30 come into contact with the end face 28 and the guide 56, The elastic force of the constant flow compression spring 30 also starts to act. Since the spring constant of the constant flow compression spring 30 is sufficiently larger than that of the non-return compression spring 40, a larger elastic force acts on the valve body 20, and the downstream movement of the valve body 20 is suppressed. It is done.

徐々に、弁体２０が下流方向に移動すると、小径部１６に位置する弁体２０の定流量用テーパ部２１の径が大きくなり、小径部１６における流路の断面積が徐々に小さくなる。但し、弁体２０が下流側に移動するにつれて差圧も大きくなっているため、小径部１６を通過する流体の流量自体はほぼ一定に保たれる。   When the valve body 20 gradually moves in the downstream direction, the diameter of the constant flow rate taper portion 21 of the valve body 20 located in the small diameter portion 16 increases, and the cross-sectional area of the flow path in the small diameter portion 16 gradually decreases. However, since the differential pressure increases as the valve body 20 moves downstream, the flow rate of the fluid passing through the small diameter portion 16 is kept substantially constant.

そして、図５（ｃ）に示すように、差圧が大きくなり、各圧縮バネ３０，４０の弾性力に抗して弁体２０が最大限近く下流側に移動した場合には、定流量用テーパ部２１の最大径の部分が小径部１６に位置し、小径部１６における流路の断面積は、最も小さくなる。   And as shown in FIG.5 (c), when the differential pressure | voltage becomes large and the valve body 20 moves against the elastic force of each compression spring 30 and 40 near the maximum, it is for constant flow. The maximum diameter portion of the taper portion 21 is located in the small diameter portion 16, and the cross-sectional area of the flow path in the small diameter portion 16 is the smallest.

図６には、本実施形態に係る逆止機能付き定流量弁の流量特性を示す。横軸が差圧（kg/cm²）、縦軸が流量（L/min）を示している。同図に示すように、差圧が0から徐々に大きくなると、流量が増えており、これは、弁体２０が逆止用圧縮バネ４０の弾性力に逆らって下流側に移動して開弁した状態を示している。 FIG. 6 shows the flow characteristics of the constant flow valve with a check function according to this embodiment. The horizontal axis indicates the differential pressure (kg / cm ² ), and the vertical axis indicates the flow rate (L / min). As shown in the figure, when the differential pressure gradually increases from 0, the flow rate increases, and this is because the valve body 20 moves downstream against the elastic force of the check compression spring 40 to open the valve. Shows the state.

差圧が0.5を越えたあたりから、差圧がそれ以上大きくなっても流量がほぼ一定になっている。これは、差圧が大きくなって弁体２０が下流側に移動するにつれて、小径部１６と定流量用テーパ部２１との隙間（流路断面積）が小さくなることで、つまり、単位時間当たりの単位断面積における流量が増えても、流路断面積を小さくすることで、全体の流量を一定に保っている。   Since the differential pressure exceeds 0.5, the flow rate is almost constant even if the differential pressure increases further. This is because the gap (channel cross-sectional area) between the small diameter portion 16 and the constant flow rate taper portion 21 decreases as the differential pressure increases and the valve body 20 moves downstream, that is, per unit time. Even if the flow rate in the unit cross-sectional area increases, the overall flow rate is kept constant by reducing the cross-sectional area of the flow path.

以上、本実施形態に係る逆止機能付き定流量弁について詳細に説明したが、本実施形態によれば、定流量弁と逆止弁を一体化したので、設置される配管を短くし、小型化、低コスト化に適した逆止機能付き定流量弁を提供することができる。   As described above, the constant flow valve with a check function according to the present embodiment has been described in detail. However, according to the present embodiment, since the constant flow valve and the check valve are integrated, the installed pipe is shortened and the small size is reduced. It is possible to provide a constant flow valve with a check function suitable for reduction in cost and cost.

特に、逆止用圧縮バネと定流量用圧縮バネをコイルバネとして、同軸に重ねて配置しているので、支持用の部材を共有するなど、さらなる小型化、低コスト化を実現している。また、弁体に定流量用テーパ面と逆止用テーパ面を隣接して設置し、これらに対向するように、弁箱に小径部（オリフィス）とテーパ面（シール面）を隣接して設置していることも、小型化に寄与している。   In particular, since the non-return compression spring and the constant flow compression spring are arranged coaxially as coil springs, further miniaturization and cost reduction are realized, such as sharing a support member. Also, a constant flow rate taper surface and a non-return taper surface are installed adjacent to the valve body, and a small diameter part (orifice) and taper surface (seal surface) are installed adjacent to the valve box so as to face them. This also contributes to miniaturization.

また、本実施形態に係る逆止機能付き定流量弁は、逆止弁の開弁時には、バネ定数の小さい逆止用圧縮バネのみが作用するように構成しているので、簡単に逆止弁を開けることができると共に、定流量機能を発揮する際には、バネ定数の大きい定流量用圧縮バネも作用するように構成したので、差圧が大きい場合でも確実に定流量機能を実現できる。   In addition, the constant flow valve with a check function according to this embodiment is configured so that only the check compression spring having a small spring constant acts when the check valve is opened. When the constant flow rate function is exhibited, the constant flow rate compression spring having a large spring constant also acts, so that the constant flow rate function can be reliably realized even when the differential pressure is large.

以上、本発明の実施形態について詳細に説明したが、本発明の実施の形態は、上記実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々の変形が可能である。例えば、逆止機能付き定流量弁を構成する部品の形状、サイズ、材質等は、本発明の作用効果を得られる範囲内で適宜設計変更可能であることは言うまでもない。   As mentioned above, although embodiment of this invention was described in detail, embodiment of this invention is not limited to the said embodiment, A various deformation | transformation is possible within the range which does not deviate from the main point of this invention. . For example, it is needless to say that the shape, size, material, and the like of the parts constituting the constant flow valve with a check function can be appropriately changed within the range where the effects of the present invention can be obtained.

また、本実施形態では、逆止用圧縮バネを外側に配置し、内側に定流量用圧縮バネを配置したが、定流量用圧縮バネが外側で、逆止用圧縮バネを内側に設置しても良い。また、弁体を上流側に付勢するバネ部材として、コイルバネ以外にも板バネ等の他のバネ部材を用いても良い。   In this embodiment, the check compression spring is arranged outside and the constant flow compression spring is arranged inside. However, the constant flow compression spring is arranged outside, and the check compression spring is installed inside. Also good. In addition to the coil spring, other spring members such as a leaf spring may be used as the spring member for urging the valve body upstream.

図１は、本実施形態に係る逆止機能付き定流量弁の構成を示す断面図である。FIG. 1 is a cross-sectional view illustrating a configuration of a constant flow valve with a check function according to the present embodiment. 図２は、本実施形態に係る逆止機能付き定流量弁を構成する部品の展開図である。FIG. 2 is a development view of components constituting the constant flow valve with a check function according to the present embodiment. 図３は、本実施形態に係る本実施形態に係る弁箱の構成を示す断面図である。FIG. 3 is a cross-sectional view showing the configuration of the valve box according to the present embodiment according to the present embodiment. 図４は、本実施形態に係る弁体の構成を示す正面図である。FIG. 4 is a front view showing the configuration of the valve body according to the present embodiment. 図５は、本実施形態に係る逆止機能付き定流量弁の動作状態を示す図である。FIG. 5 is a diagram illustrating an operation state of the constant flow valve with a check function according to the present embodiment. 図６は、本実施形態に係る逆止機能付き定流量弁の流量特性を示す図である。FIG. 6 is a diagram showing the flow characteristics of the constant flow valve with a check function according to the present embodiment.

符号の説明Explanation of symbols

１ 逆止機能付き定流量弁
１０ 弁箱
１５ テーパ部
１６ 小径部
２０ 弁体
２１ 定流量用テーパ部（定流量用弁部）
２２ 逆止用テーパ部（逆止用弁部）
２３ 大径部
２４ 軸部
２５ Ｏリング
３０ 定流量用圧縮バネ（第２バネ部材）
４０ 逆止用圧縮バネ（第１バネ部材）
５０，５１ Ｃ形止め輪
５５，５６ ガイド DESCRIPTION OF SYMBOLS 1 Constant flow valve with check function 10 Valve box 15 Taper part 16 Small diameter part 20 Valve body 21 Taper part for constant flow (valve part for constant flow)
22 Taper for check (valve for check)
23 Large diameter portion 24 Shaft portion 25 O-ring 30 Compression spring for constant flow (second spring member)
40 Non-return compression spring (first spring member)
50, 51 C-type retaining ring 55, 56 Guide

Claims (4)

流量を一定に保つための逆止機能付き定流量弁において、
流体が流れる流路を内部に有する弁箱と、
前記弁箱の流路に軸方向に往復移動可能に設置された弁体であって、軸方向に移動することで前記弁箱の流路内壁との隙間を変化させて流路断面積を変化させる定流量用弁部と、前記弁箱の流路内壁と接触して逆止弁として作用する逆止用弁部と、を有する弁体と、
前記弁体を上流側へ付勢するバネ部材であって、非通水時に前記逆止用弁部を前記弁箱の流路内壁に圧接させて逆止弁を閉じた状態とするバネ部材と、
を備えることを特徴とする逆止機能付き定流量弁。 In constant flow valve with check function to keep the flow rate constant,
A valve box having a flow path through which fluid flows;
A valve element installed in the flow path of the valve box so as to be capable of reciprocating in the axial direction, and moving in the axial direction changes the gap with the inner wall of the flow path of the valve box to change the cross-sectional area of the flow path A valve body having a constant flow rate valve portion and a check valve portion that contacts the flow path inner wall of the valve box and acts as a check valve;
A spring member for urging the valve body upstream, wherein the check valve is closed by bringing the check valve portion into pressure contact with the flow path inner wall of the valve box when water is not flowing; ,
A constant flow valve with a check function. 前記バネ部材を第１バネ部材として、
前記弁体を上流側へ付勢する第２バネ部材であって、前記逆止弁が閉じた状態では自由状態となるように隙間を持って設置され、通水時に前記逆止弁が開いて前記弁体が前記隙間長さ以上に下流側に移動すると、前記弁体を前記上流側へ付勢し始める第２バネ部材をさらに備えることを特徴とする請求項１記載の逆止機能付き定流量弁。 The spring member as a first spring member,
A second spring member that urges the valve body upstream, and is installed with a gap so that the check valve is in a free state when the check valve is closed; 2. The fixed function with a check function according to claim 1, further comprising a second spring member that starts to bias the valve body toward the upstream side when the valve body moves downstream beyond the gap length. Flow valve. 前記第２バネ部材のバネ定数が、前記第１バネ部材のバネ定数よりも大きいことを特徴とする請求項２記載の逆止機能付き定流量弁。   The constant flow valve with a check function according to claim 2, wherein a spring constant of the second spring member is larger than a spring constant of the first spring member. 前記第１バネ部材及び前記第２バネ部材はコイルバネであり、一方のバネ部材の内径を他方のバネ部材の外径よりも大きくし、一方のバネ部材の内側に他方のバネ部材を同軸に重ねて配置したことを特徴とする請求項２又は３記載の逆止機能付き定流量弁。   The first spring member and the second spring member are coil springs, the inner diameter of one spring member is larger than the outer diameter of the other spring member, and the other spring member is coaxially stacked inside one spring member. The constant flow valve with a check function according to claim 2 or 3, characterized by being arranged.

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