JP6554053B2

JP6554053B2 - Differential pressure valve

Info

Publication number: JP6554053B2
Application number: JP2016050374A
Authority: JP
Inventors: 康治中山; 輝聖見津; 哲二相島
Original assignee: Toyota Motor Corp; Pacific Industrial Co Ltd
Current assignee: Toyota Motor Corp; Pacific Industrial Co Ltd
Priority date: 2016-03-15
Filing date: 2016-03-15
Publication date: 2019-07-31
Anticipated expiration: 2036-03-15
Also published as: JP2017166528A

Description

本発明は、上流側と下流側との差圧が一定の大きさ以上になると開弁する差圧弁に関する。 The present invention relates to a differential pressure valve which opens when the differential pressure between the upstream side and the downstream side becomes equal to or greater than a predetermined value.

従来、この種の差圧弁は、弁口に対して下流側から弁体が接離すると共に、その弁体が圧縮コイルバネ等により閉弁側に付勢された構造になっている（例えば、特許文献１参照）。 Conventionally, this type of differential pressure valve has a structure in which the valve body is in contact with and separated from the downstream side with respect to the valve port, and the valve body is biased toward the valve closing side by a compression coil spring or the like (for example, Reference 1).

特開２００７−１００８１４号公報（図２参照）Japanese Patent Laid-Open No. 2007-1000081 (see FIG. 2)

しかしながら、上記した従来の差圧弁では、ハンチング現象による騒音が問題になっていた。 However, in the conventional differential pressure valve described above, noise due to the hunting phenomenon has been a problem.

本発明は、上記事情に鑑みてなされたもので、従来より静粛性が高い差圧弁の提供を目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a differential pressure control valve which is quieter than the conventional one.

上記目的を達成するためになされた請求項１の発明は、屈曲した流路（１６）を有するベース部材（１１）と、前記流路（１６）の屈曲部（１６Ａ）の上流側を絞ってなる第１弁口（２４）と、前記ベース部材（１１）のうち前記屈曲部（１６Ａ）を挟んで前記第１弁口（２４）の反対側に形成されている小径嵌合孔部（２３）と、前記ベース部材（１１）のうち前記小径嵌合孔部（２３）より前記第１弁口（２４）から離れる側に形成され、前記小径嵌合孔部（２３）より内径が大きい大径嵌合孔部（２２）と、前記小径嵌合孔部（２３）に嵌合する小径嵌合軸部（３５）と前記大径嵌合孔部（２２）に嵌合する大径嵌合軸部（３８）とを有して前記ベース部材（１１）に対して直動し、前記第１弁口（２４）を開閉する第１弁体（３０）と、前記第１弁体（３０）を閉弁側に付勢する第１付勢手段（１５）と、前記大径嵌合孔部（２２）における前記小径嵌合孔部（２３）との段差面（２２Ｄ）と前記大径嵌合軸部（３８）との間に挟まれている特別空間（１７）と、前記第１弁体（３０）に形成され、前記第１弁口（２４）との対向面に開口する流入開口（５４Ａ）を一端に有すると共に、前記特別空間（１７）に連通する連通開口（５４Ｂ）を他端に有する流体導入路（５４）と、前記流体導入路（５４）の途中に設けられて、前記流入開口（５４Ａ）から前記連通開口（５４Ｂ）に流れる流体の全てが通過する第２弁口（５２）と、前記第２弁口（５２）に対して下流側から接離して前記第２弁口（５２）を開閉する第２弁体（５９）と、前記第２弁体（５９）を閉弁側に付勢する第２付勢手段（５８）と、前記大径嵌合孔部（２２）の内周面と前記大径嵌合軸部（３８）の外周面との間をシールするシール部材（４１）と、前記特別空間（１７）を前記流路（１６）における第１弁口（２４）より下流側に常時連通するオリフィス（１８）とを備え、前記第１弁体（３０）及び前記第２弁体（５９）が閉じた状態から、前記第２弁体（５９）は、前記流路（１６）のうち前記第１弁口（２４）より上流側と下流側との差圧の変化に起因して開弁し、前記第１弁体（３０）は、前記第２弁体（５９）の開弁により前記特別空間（１７）の圧力が前記流路（１６）の前記下流側の圧力から前記上流側の圧力に変わったことに起因して開弁する差圧弁（１０）である。 The invention according to claim 1 made to achieve the above object is to squeeze the upstream side of the base member (11) having a bent flow passage (16) and the bent portion (16A) of the flow passage (16). And a small diameter fitting hole (23) formed on the opposite side of the first valve port (24) across the bent portion (16A) of the base member (11). And the base member (11) is formed on the side away from the first valve port (24) from the small diameter fitting hole (23), and the inner diameter is larger than the small diameter fitting hole (23). Diameter fitting hole (22), small diameter fitting shaft (35) fitting into the small diameter fitting hole (23), and large diameter fitting fitting into the large diameter fitting hole (22) A first valve body (30) having a shaft portion (38) and moving linearly relative to the base member (11) to open and close the first valve port (24); A step between the first biasing means (15) for biasing the first valve body (30) toward the valve closing side and the small diameter fitting hole (23) in the large diameter fitting hole (22). A special space (17) sandwiched between a surface (22D) and the large-diameter fitting shaft portion (38), and the first valve body (30) are formed in the first valve port (24). A fluid introduction path (54) having at one end an inflow opening (54A) that opens to the opposite surface and a communication opening (54B) communicating with the special space (17) at the other end, and the fluid introduction path ( 54) , the second valve port (52) through which all of the fluid flowing from the inflow opening (54A) to the communication opening (54B) passes, and the second valve port (52). A second valve body (59) that opens and closes the second valve port (52) by contacting and separating from the downstream side, and the second valve body (59) is on the valve closing side Second energizing means (58) for energizing, and a seal member for sealing between the inner peripheral surface of the large-diameter fitting hole (22) and the outer peripheral surface of the large-diameter fitting shaft portion (38) 41) and an orifice (18) that always communicates the special space (17) downstream from the first valve port (24) in the flow path (16), the first valve body (30) and the From the state where the second valve body (59) is closed, the second valve body (59) has a differential pressure between the upstream side and the downstream side of the first valve port (24) in the flow path (16). Due to the change, the first valve element (30) opens the second valve element (59) so that the pressure in the special space (17) is on the downstream side of the flow path (16). The differential pressure valve (10) is opened due to the change from the pressure of (1) to the pressure on the upstream side .

請求項２の発明は、前記第１弁口（２４）の口径に比べて、前記小径嵌合軸部（３５）の外径が大きい請求項１に記載の差圧弁（１０）である。 The invention according to claim 2 is the differential pressure valve (10) according to claim 1, wherein the outer diameter of the small diameter fitting shaft (35) is larger than the diameter of the first valve port (24).

請求項３の発明は、前記小径嵌合軸部（３５）の外周面に形成されたリング収容溝（３５Ａ）と、前記リング収容溝（３５Ａ）に収容されたＣリング（４３）とを備え、前記Ｃリング（４３）に備えた切欠部が前記オリフィス（１８）になっている請求項１又は２に記載の差圧弁（１０）である。 The invention according to claim 3 comprises a ring receiving groove (35A) formed on the outer peripheral surface of the small diameter fitting shaft (35), and a C ring (43) received in the ring receiving groove (35A). The differential pressure valve (10) according to claim 1 or 2, wherein a notch provided in the C ring (43) is the orifice (18).

請求項４の発明は、前記流体導入路（５４）には、第１弁口（２４）の中心軸と平行に直線状に延びた直線部（５０）が備えられて、前記直線部（５０）に前記第２弁口（５２）が配置されている請求項１乃至３の何れか１の請求項に記載の差圧弁（１０）である。 According to the invention of claim 4, the fluid introduction passage (54) is provided with a straight portion (50) extending in a straight line parallel to the central axis of the first valve port (24). The differential pressure valve (10) according to any one of claims 1 to 3, wherein the second valve port (52) is disposed in the.

請求項５の発明は、前記第１弁体（３０）には、前記小径嵌合軸部（３５）と前記大径嵌合軸部（３８）との間に、前記小径嵌合軸部（３５）より小径で前記小径嵌合孔部（２３）に遊嵌される遊嵌合軸部（３６）が備えられ、前記連通開口（５４Ｂ）は、前記遊嵌合軸部（３６）の外周面に開口している請求項１乃至４の何れか１の請求項に記載の差圧弁（１０）である。 According to the fifth aspect of the present invention, the first valve body (30) includes the small diameter fitting shaft portion between the small diameter fitting shaft portion (35) and the large diameter fitting shaft portion (38). 35) A loose fitting shaft (36) loosely fitted to the small diameter fitting hole (23) with a smaller diameter than the small diameter, and the communication opening (54B) is the outer periphery of the loose fitting shaft (36) A differential pressure valve (10) according to any one of the preceding claims, which is open in a plane.

請求項６の発明は、前記第１弁体（３０）のうち前記第１弁口（２４）との対向面と反対側の面は、大気圧を受けている請求項１乃至５の何れか１の請求項に記載の差圧弁（１０）である。 The invention according to claim 6 is any one of claims 1 to 5, wherein the surface of the first valve body (30) opposite to the surface facing the first valve port (24) receives atmospheric pressure. A differential pressure valve (10) according to claim 1.

本発明の差圧弁（１０）では、第１弁口（２４）より下流側の流路下流部（９２）と特別空間（１７）との間はオリフィス（１８）によって常時連通し、第１弁口（２４）より上流側の流路上流部（９１）と特別空間（１７）の間は、第２弁体（５９）による第２弁口（５２）の開閉により連通状態と断絶状態とに切り替わる。そして、流路下流部（９２）の内圧の低下に伴って特別空間（１７）の内圧が低下すると第２弁口（５２）が開き、特別空間（１７）の内圧が流路上流部（９１）の内圧と近い状態になってから第２弁口（５２）が閉じる。そして、大径嵌合軸部（３８）に高い内圧がかかって第１弁体（３０）が開位置側に移動し、第１弁口（２４）が開いて流路上流部（９１）から流路下流部（９２）へと流体が流れる。また、第２弁口（５２）が閉じると、特別空間（１７）の流体がオリフィス（１８）を通って徐々に流路下流部（９２）へと流れ、特別空間（１７）の内圧が徐々に下がることで、第１弁体（３０）が徐々に閉位置側へと移動して第１弁口（２４）が閉じられる。これにより、本発明の差圧弁（１０）では、ハンチング現象が抑えられ、従来より静粛性が高くなる。 In the differential pressure valve (10) of the present invention, the flow path downstream portion (92) downstream of the first valve port (24) and the special space (17) are always in communication with each other by the orifice (18). Between the flow path upstream portion (91) and the special space (17) on the upstream side of the port (24), the second valve body (59) opens and closes the communication state and the disconnected state by opening and closing the second valve port (52). Switch. When the internal pressure in the special space (17) decreases with a decrease in the internal pressure in the flow path downstream portion (92), the second valve port (52) is opened, and the internal pressure in the special space (17) is increased in the flow path upstream portion (91 The second valve port (52) is closed after the internal pressure is close to the Then, a high internal pressure is applied to the large-diameter fitting shaft portion (38), the first valve body (30) is moved to the open position side, the first valve port (24) is opened, and the upstream portion (91) of the flow path is opened. The fluid flows to the downstream part (92) of the flow path. Also, when the second valve port (52) is closed, the fluid in the special space (17) flows gradually through the orifice (18) to the downstream flow path (92), and the internal pressure in the special space (17) gradually The first valve body (30) gradually moves to the closed position side and the first valve port (24) is closed. As a result, in the differential pressure valve (10) of the present invention, the hunting phenomenon is suppressed and the quietness becomes higher than in the prior art.

また、請求項２の差圧弁（１０）のように、第１弁口（２４）の口径に比べて小径嵌合軸部（３５）の外径を大きくすれば、第１弁口（２４）が開いたときに小径嵌合軸部（３５）にかかる内圧によっても第１弁体（３０）を開弁側に移動又は保持することができる。 If the outer diameter of the small diameter fitting shaft (35) is made larger than the diameter of the first valve port (24) as in the differential pressure valve (10) of claim 2, the first valve port (24) The first valve body (30) can be moved or held to the valve opening side also by the internal pressure applied to the small diameter fitting shaft portion (35) when the valve opening is opened.

さらに、オリフィス（１８）に関しては、第１弁体（３０）又はベース部材（１１）に流路径が小さい孔を形成してオリフィスとしてもよいし、請求項３の発明のように、小径嵌合軸部（３５）の外周面に備えたＣリング（４３）の切欠部をオリフィス（１８）としてもよい。また、請求項４及び５の構成により、流体導入路（５４）の構成が簡素になる。 Furthermore, regarding the orifice (18), a hole having a small flow passage diameter may be formed in the first valve body (30) or the base member (11) to form an orifice, and as in the invention of claim 3, the small diameter fitting The cutout portion of the C ring (43) provided on the outer peripheral surface of the shaft portion (35) may be the orifice (18). Moreover, the structure of the fluid introduction path (54) becomes simple by the structure of Claims 4 and 5.

本発明の一実施形態に係る差圧弁の第１弁口と第２弁口とが閉じた状態の側断面図The sectional side view in the state where the 1st valve mouth and the 2nd valve mouth of the differential pressure valve concerning one embodiment of the present invention closed 差圧弁の第１弁口が閉じ、第２弁口が開いた状態の側断面図Side sectional view of the differential valve with the first valve port closed and the second valve port opened 差圧弁の第１弁口と第２弁口とが開いた状態の側断面図Side sectional view of the differential valve with the first valve port and the second valve port opened 差圧弁の第１弁口が開き、第２弁口が閉じた状態の側断面図Side sectional view of the differential valve with the first valve port open and the second valve port closed

以下、本発明の一実施形態の差圧弁１０を図１〜図４に基づいて説明する。なお、この差圧弁１０は、重力方向に対して任意の姿勢で使用可能であるが、以下の説明では、図１〜図５の上下方向を差圧弁１０の上下方向として説明する。 Hereinafter, a differential pressure valve 10 according to an embodiment of the present invention will be described with reference to FIGS. Although this differential pressure valve 10 can be used in any posture with respect to the direction of gravity, in the following description, the vertical direction in FIGS. 1 to 5 will be described as the vertical direction of the differential pressure valve 10.

図１に示すように、本実施形態の差圧弁１０のバルブボディ１２は、例えば、直方体の一部を切除した形状をなし、上下に貫通する貫通孔２０を有する。貫通孔２０には、上から順番に雌螺子部２１、大径嵌合孔部２２、小径嵌合孔部２３、第１弁口２４及び流入管接続部２５が備えられ、それらは第１弁口２４を除く、雌螺子部２１、大径嵌合孔部２２、小径嵌合孔部２３、流入管接続部２５の順番で内径が段階的に小さくなっていて、流入管接続部２５の上端部が絞られて第１弁口２４になっている。また、第１弁口２４における小径嵌合孔部２３側の開口縁からは環状突条２４Ｔが突出していて、その環状突条２４Ｔの上面が第１弁口２４の弁座２４Ｚになっている。 As shown in FIG. 1, the valve body 12 of the differential pressure valve 10 according to the present embodiment has, for example, a shape obtained by cutting out a part of a rectangular parallelepiped, and has a through hole 20 penetrating vertically. The through-hole 20 includes a female screw portion 21, a large-diameter fitting hole portion 22, a small-diameter fitting hole portion 23, a first valve port 24, and an inflow pipe connecting portion 25 in order from the top. The inner diameter is gradually reduced in the order of the female screw 21, the large diameter fitting hole 22, the small diameter fitting hole 23, and the inflow pipe connection 25 except the mouth 24, and the upper end of the inflow pipe connection 25 The part is squeezed into a first valve port 24. An annular ridge 24T protrudes from the opening edge of the first valve port 24 on the small diameter fitting hole 23 side, and the upper surface of the annular ridge 24T is a valve seat 24Z of the first valve port 24. .

小径嵌合孔部２３の下端寄り位置とバルブボディ１２の一側面との間には、流出管接続部１９が形成されている。また、流出管接続部１９における小径嵌合孔部２３側の端部が絞られて排出口１９Ａになっている。そして、流入管接続部２５から小径嵌合孔部２３を通過して流出管接続部１９へと流体が流れる流路１６が構成されている。また、流路１６における小径嵌合孔部２３が、本発明に係る屈曲部１６Ａになっている。 An outflow pipe connection 19 is formed between the lower end of the small diameter fitting hole 23 and one side of the valve body 12. Further, the end on the small diameter fitting hole portion 23 side of the outflow pipe connection portion 19 is narrowed to form a discharge port 19A. Then, a flow path 16 in which the fluid flows from the inflow pipe connection portion 25 through the small diameter fitting hole portion 23 to the outflow pipe connection portion 19 is configured. The small diameter fitting hole 23 in the flow passage 16 is a bent portion 16A according to the present invention.

バルブボディ１２の雌螺子部２１には、ストッパリング１３が螺合装着されている。そのストッパリング１３は、円筒状をなし、その外周面には雄螺子部１３Ａが形成され、内周面には雌螺子部１３Ｂが形成されている。また、ストッパリング１３の外周面の上端部からは鍔部１３Ｆが側方に張り出し、ストッパリング１３の下端面の内縁部からは位置決突部１３Ｔが下方に突出している。さらに、ストッパリング１３の上面における周方向の複数位置には、工具孔１３Ｈが穿孔されている。そして、鍔部１３Ｆがバルブボディ１２の上面に当接し、位置決突部１３Ｔの下面がバルブボディ１２の雌螺子部２１と大径嵌合孔部２２との境界部分に配置されている。 A stopper ring 13 is screwed to the female screw portion 21 of the valve body 12. The stopper ring 13 has a cylindrical shape, a male screw portion 13A is formed on the outer peripheral surface thereof, and a female screw portion 13B is formed on the inner peripheral surface thereof. Further, from the upper end portion of the outer peripheral surface of the stopper ring 13, a collar portion 13F protrudes laterally, and from the inner edge portion of the lower end surface of the stopper ring 13, a positioning protrusion 13T protrudes downward. Further, tool holes 13H are bored at a plurality of circumferential positions on the upper surface of the stopper ring 13. The flange portion 13F abuts on the upper surface of the valve body 12, and the lower surface of the positioning protrusion 13T is disposed at the boundary between the female screw portion 21 of the valve body 12 and the large diameter fitting hole 22.

ストッパリング１３の雌螺子部１３Ｂには、調整リング１４が螺合装着されている。調整リング１４は、円盤状をなし、外周面に雄螺子部１４Ａを有すると共に、中央に貫通孔１４Ｂを有する。また、貫通孔１４Ｂの周囲の複数位置には、工具孔１４Ｈが穿孔され、調整リング１４の下面には、貫通孔１４Ｂより内径が大きいバネ受容凹部１４Ｃが形成されている。 An adjustment ring 14 is screwed onto the female screw portion 13B of the stopper ring 13. The adjusting ring 14 has a disk shape, has an external thread 14A on the outer peripheral surface, and has a through hole 14B at the center. Tool holes 14H are bored at a plurality of positions around the through hole 14B, and a spring receiving recess 14C having a larger inside diameter than the through hole 14B is formed on the lower surface of the adjustment ring 14.

本実施形態では、バルブボディ１２とストッパリング１３と調整リング１４とから本発明に係るベース部材１１が構成されている。そして、このベース部材１１の内部に、第１弁体３０が収容されている。第１弁体３０は、弁体本体３１に押えリング４０、詰栓４４等を組み付けてなる。弁体本体３１は、上下に延びる円柱部３２の下端部と上端寄り位置とから第１円盤部３３と第２円盤部３４とが側方に張り出した構造になっている。下端部の第１円盤部３３は、小径嵌合孔部２３の内径より外径が小さく、その下面には外縁部と内縁部とを除く全体を陥没させてパッキン装着部３３Ａが形成されている。そして、パッキン装着部３３Ａにパッキン４２が収容されて、例えば接着剤で固定されている。 In the present embodiment, the base member 11 according to the present invention is constituted by the valve body 12, the stopper ring 13 and the adjustment ring 14. The first valve body 30 is accommodated in the base member 11. The first valve body 30 is formed by assembling the presser ring 40, the plug 44, and the like to the valve body main body 31. The valve body 31 has a structure in which a first disc portion 33 and a second disc portion 34 project laterally from the lower end portion and the upper end position of the vertically extending cylindrical portion 32. The first disk portion 33 at the lower end has an outer diameter smaller than the inner diameter of the small diameter fitting hole 23, and the packing attachment portion 33A is formed on the lower surface of the first disk portion 33 with the entire outer edge and inner edge depressed. . The packing 42 is accommodated in the packing mounting portion 33A and fixed, for example, with an adhesive.

第２円盤部３４は、第１円盤部３３より厚くなっていて、その外周面の下端部が側方に僅かに突出し、その突出部分を有する第２円盤部３４の下端部全体が、本発明に係る小径嵌合軸部３５になっている。そして、小径嵌合軸部３５が、小径嵌合孔部２３に僅かな隙間を空けて嵌合されている。 The second disc portion 34 is thicker than the first disc portion 33, and the lower end portion of the outer peripheral surface of the second disc portion 34 slightly protrudes sideward, and the entire lower end portion of the second disc portion 34 having the projecting portion is the present invention It is the small diameter fitting shaft part 35 concerning. Then, the small diameter fitting shaft 35 is fitted in the small diameter fitting hole 23 with a slight gap.

小径嵌合軸部３５の外周面にはリング収容溝３５Ａが形成され、そこにＣリング４３が収容されている。Ｃリング４３は、例えば、樹脂製又はエラストマー製の平板状のリングにおける周方向の一部を切除して本発明に係る切欠部を備えている。また、Ｃリング４３は、僅かに弾性縮径された状態で小径嵌合孔部２３の内周面に当接している。そして、Ｃリング４３の切欠部が、本発明に係るオリフィス１８になっている。 A ring accommodating groove 35A is formed on the outer peripheral surface of the small diameter fitting shaft 35, and the C ring 43 is accommodated therein. The C ring 43 is provided with a notch according to the present invention, for example, by cutting out a part in the circumferential direction of a flat ring made of resin or elastomer. Further, the C ring 43 is in contact with the inner peripheral surface of the small diameter fitting hole portion 23 in a state of being slightly elastically contracted. And the notch part of C ring 43 is the orifice 18 which concerns on this invention.

第２円盤部３４の外周面の上端部からは、フランジ部３７Ａが側方に張り出し、そのフランジ部３７Ａの上面外縁部から断面四角形の環状突条３７Ｂが突出している。また、環状突条３７Ｂの内側には押えリング４０が圧入され、その押えリング４０と環状突条３７Ｂとフランジ部３７Ａとから本発明に係る大径嵌合軸部３８が構成されている。さらに、押えリング４０の外周面の上端部からはフランジ部４０Ｆが張り出していて、そのフランジ部４０Ｆと環状突条３７Ｂとに環状シール４１（本発明の「シール部材」に相当する）が挟持されている。また、フランジ部４０Ｆの外周面と環状突条３７Ｂ及びフランジ部３７Ａの外周面は面一になって大径嵌合軸部３８全体の外周面を構成している。そして、大径嵌合軸部３８が大径嵌合孔部２２に僅かな隙間を空けて嵌合されると共に、環状シール４１の一部が大径嵌合軸部３８の外周面から突出して大径嵌合孔部２２の内周面に密着している。 From the upper end portion of the outer peripheral surface of the second disk portion 34, a flange portion 37A protrudes laterally, and an annular ridge 37B having a rectangular cross section protrudes from the upper surface outer edge portion of the flange portion 37A. Further, a pressing ring 40 is press-fit into the inside of the annular ridge 37B, and the large diameter fitting shaft 38 according to the present invention is constituted by the pressing ring 40, the annular ridge 37B and the flange 37A. Further, a flange portion 40F protrudes from the upper end portion of the outer peripheral surface of the pressing ring 40, and an annular seal 41 (corresponding to the "seal member" of the present invention) is held between the flange portion 40F and the annular projection 37B. ing. Further, the outer peripheral surface of the flange portion 40F and the outer peripheral surface of the annular ridge 37B and the flange portion 37A are flush with each other to constitute the entire outer peripheral surface of the large diameter fitting shaft portion 38. Then, the large diameter fitting shaft 38 is fitted in the large diameter fitting hole 22 with a slight gap, and a part of the annular seal 41 protrudes from the outer peripheral surface of the large diameter fitting shaft 38. The large diameter fitting hole 22 is in close contact with the inner peripheral surface.

第２円盤部３４のうち小径嵌合軸部３５と大径嵌合軸部３８との間は、小径嵌合軸部３５より僅かに外径が小さい遊嵌合軸部３６になっていて、大径嵌合孔部２２と小径嵌合孔部２３とに跨がって嵌合されている。 Between the small diameter fitting shaft portion 35 and the large diameter fitting shaft portion 38 of the second disk portion 34, a loose fitting shaft portion 36 having a slightly smaller outer diameter than the small diameter fitting shaft portion 35 is provided. The large diameter fitting hole 22 and the small diameter fitting hole 23 are fitted across each other.

第１弁体３０は、大径嵌合軸部３８と大径嵌合孔部２２との嵌合と、小径嵌合軸部３５と小径嵌合孔部２３との嵌合とによって、ベース部材１１に直動可能に支持されている。また、第２円盤部３４と調整リング１４との間には、圧縮コイルバネ１５（本発明の「第１付勢手段」に相当する）が収容され、その圧縮コイルバネ１５の弾発力によって、第１弁体３０が下方に付勢されている。なお、圧縮コイルバネ１５の上端部は、調整リング１４のバネ受容凹部１４Ｃに受容され、第２円盤部３４の上面には、バネ受容凹部１４Ｃと同様のバネ受容凹部３４Ａが形成されている。 The first valve body 30 is a base member by fitting the large diameter fitting shaft 38 and the large diameter fitting hole 22 and fitting the small diameter fitting shaft 35 and the small diameter fitting hole 23. 11 is supported so as to be linearly movable. In addition, a compression coil spring 15 (corresponding to the “first biasing means” of the present invention) is accommodated between the second disc portion 34 and the adjustment ring 14, and the elastic force of the compression coil spring 15 causes the compression coil spring 15 to The single valve body 30 is biased downward. The upper end portion of the compression coil spring 15 is received by the spring receiving recess 14C of the adjustment ring 14, and a spring receiving recess 34A similar to the spring receiving recess 14C is formed on the upper surface of the second disk portion 34.

第１弁体３０は、図１に示すように弁座２４Ｚとの当接よって直動範囲の下端位置（第１弁口２４の閉弁位置でもある）に位置決めされる一方、図３に示すように大径嵌合軸部３８と位置決突部１３Ｔとの当接によって直動範囲の上端位置に位置決めされる。 While the first valve body 30 is positioned at the lower end position of the linear movement range (which is also the closed position of the first valve port 24) by contact with the valve seat 24Z as shown in FIG. As described above, the contact between the large diameter fitting shaft portion 38 and the positioning projection 13T positions the upper end position of the linear movement range.

大径嵌合軸部３８と、大径嵌合孔部２２における小径嵌合孔部２３との間の段差面２２Ｄと間は、本発明に係る特別空間１７になっている。また、第１弁体３０が閉弁位置に配置された状態でも、大径嵌合軸部３８が段差面２２Ｄから離間していて特別空間１７が消滅しないようになっている。 The space between the large diameter fitting shaft 38 and the small diameter fitting hole 23 of the large diameter fitting hole 22 is a special space 17 according to the present invention. Further, even when the first valve body 30 is disposed at the valve closing position, the large diameter fitting shaft 38 is separated from the step surface 22D so that the special space 17 does not disappear.

第１弁体３０には、円柱部３２の中心部を貫通する縦孔５０と、遊嵌合軸部３６を径方向に貫通する横孔５１とが形成されて互いに直交している。また、縦孔５０のうち横孔５１より下側位置には段差面５０Ｄが設けられ、段差面５０Ｄより上側の内径が段付き状に大きくなっていて、さらに、縦孔５０の上端部は、雌螺子孔５３になっている。なお、横孔５１の内径は、縦孔５０のうち段差面５０Ｄより下側部分の内径と略同一になっている。 The first valve body 30 is formed with a vertical hole 50 penetrating the central portion of the cylindrical portion 32 and a horizontal hole 51 penetrating the loose fitting shaft portion 36 in a radial direction, which are orthogonal to each other. Further, a step surface 50D is provided at a position below the horizontal hole 51 in the vertical hole 50, and the inner diameter above the step surface 50D is increased in a stepped shape, and the upper end portion of the vertical hole 50 is A female screw hole 53 is formed. The inner diameter of the horizontal hole 51 is substantially the same as the inner diameter of the lower portion of the vertical hole 50 than the step surface 50D.

雌螺子孔５３には、詰栓４４が螺合装着されている。詰栓４４は、上側から順番にフランジ部４４Ａ、雄螺子部４４Ｂ、孔嵌合部４４Ｃ及びバネ嵌合部４４Ｄを備えてなり、下方に向かって段階的に外径が縮径している。また、孔嵌合部４４Ｃの外周面には、Ｏリング溝が形成され、そこにＯリング４５が装着されている。そして、フランジ部４４Ａが円柱部３２の上面に当接する位置まで雄螺子部４４Ｂが第１弁体３０の雌螺子孔５３に締め込まれ、Ｏリング４５が縦孔５０の内周面に密着している。これにより、縦孔５０の上端部が閉塞され、縦孔５０と横孔５１とから本発明に係る流体導入路５４が構成されている。そして、縦孔５０の下端部の開口が、本発明に係る流入開口５４Ａをなし、遊嵌合軸部３６の外周面における横孔５１の開口が、本発明に係る連通開口５４Ｂになし、さらには、段差面５０Ｄの開口が本発明に係る第２弁口５２になっている。なお、オリフィス１８における流体の通過面積に比べて、第２弁口５２における流体の通過面積は、極めて大きくなっている。 A plug 44 is screwed into the female screw hole 53. The plug 44 includes a flange portion 44A, a male screw portion 44B, a hole fitting portion 44C and a spring fitting portion 44D in order from the upper side, and the outer diameter thereof is gradually reduced toward the lower side. In addition, an O-ring groove is formed on the outer peripheral surface of the hole fitting portion 44C, and the O-ring 45 is attached thereto. Then, the male screw portion 44B is tightened in the female screw hole 53 of the first valve body 30 to a position where the flange portion 44A abuts on the upper surface of the cylindrical portion 32, and the O ring 45 adheres closely to the inner peripheral surface of the vertical hole 50. ing. Thereby, the upper end part of the vertical hole 50 is obstruct | occluded, and the fluid introduction path 54 which concerns on this invention from the vertical hole 50 and the horizontal hole 51 is comprised. The opening at the lower end of the vertical hole 50 forms the inflow opening 54A according to the present invention, the opening of the lateral hole 51 on the outer peripheral surface of the loose fitting shaft portion 36 forms the communication opening 54B according to the present invention, and The opening of the step surface 50D is the second valve port 52 according to the present invention. In addition, compared with the passage area of the fluid in the orifice 18, the passage area of the fluid in the second valve port 52 is extremely large.

縦孔５０のうち段差面５０Ｄと詰栓４４との間には、ボール状の第２弁体５９と圧縮コイルバネ５８（本発明の「第２付勢手段」に相当する）とが収容されている。そして、圧縮コイルバネ５８によって第２弁体５９が第２弁口５２を閉弁する位置に付勢されている。なお、第２弁体５９の上端部は、詰栓４４のバネ嵌合部４４Ｄの外側に嵌合されている。 A ball-shaped second valve body 59 and a compression coil spring 58 (corresponding to the “second biasing means of the present invention”) are accommodated between the step surface 50D of the vertical hole 50 and the plug 44. There is. Then, the second valve body 59 is biased by the compression coil spring 58 to a position where the second valve port 52 is closed. The upper end portion of the second valve body 59 is fitted to the outside of the spring fitting portion 44D of the plug 44.

ベース部材１１と第１弁体３０との隙間のうち小径嵌合軸部３５と大径嵌合軸部３８との挟まれかつ特別空間１７を含む空間は、流体導入路５４のうち第２弁口５２より上側部分と常時連通している内圧保持空間９３になっている。そして、第２弁口５２が開くと、内圧保持空間９３と流路１６における第１弁口２４より上流側部分（以下、これを「流路上流部９１」という）とが連通し、第２弁口５２が閉じると、内圧保持空間９３と流路上流部９１とが断絶される。また、第２弁口５２の開閉に拘わらず、内圧保持空間９３と流路１６における第１弁口２４より下流側部分（以下、これを「流路下流部９２」という）とがオリフィス１８によって常時連通している。 The space between the small diameter fitting shaft 35 and the large diameter fitting shaft 38 in the gap between the base member 11 and the first valve body 30 and including the special space 17 is the second valve of the fluid introduction passage 54. It is an internal pressure holding space 93 that is always in communication with the upper part of the port 52. Then, when the second valve port 52 is opened, the internal pressure holding space 93 and the upstream side portion of the flow path 16 from the first valve port 24 (hereinafter, this is referred to as “flow path upstream portion 91”) are communicated. When the valve port 52 is closed, the internal pressure holding space 93 and the upstream channel portion 91 are disconnected. Further, regardless of the opening and closing of the second valve port 52, the internal pressure holding space 93 and the downstream portion of the flow path 16 from the first valve port 24 (hereinafter referred to as “flow path downstream portion 92”) It is always in communication.

本実施形態の差圧弁１０の構成に関する説明は、以上である。次に、この差圧弁１０の作用効果について説明する。差圧弁１０は、例えば、第１弁体３０の上面で大気圧を受け、流入管接続部２５及び流出管接続部１９に配管が接続されて、流入管接続部２５から第１弁口２４を通って流出管接続部１９へと流体が流れ得るようにセットされる。また、内圧保持空間９３は、オリフィス１８によって流路下流部９２と連通しているので、第１弁口２４が閉じかつ第２弁口５２が閉じてから暫く経過すると内圧保持空間９３と流路下流部９２とが同じ内圧になる。この状態を以下、初期状態という。 The description regarding the structure of the differential pressure valve 10 of this embodiment is above. Next, the function and effect of the differential pressure valve 10 will be described. In the differential pressure valve 10, for example, the upper surface of the first valve body 30 receives atmospheric pressure, piping is connected to the inflow pipe connection 25 and the outflow pipe connection 19, and the first valve port 24 is connected to the inflow pipe connection 25. It is set so that fluid can flow through to the outlet pipe connection 19. Further, since the internal pressure holding space 93 is in communication with the flow path downstream portion 92 by the orifice 18, the internal pressure holding space 93 and the flow path will be kept for a while after the first valve port 24 is closed and the second valve port 52 is closed. The downstream portion 92 has the same internal pressure. This state is hereinafter referred to as the initial state.

ここで、流路上流部９１の内圧Ｐ１は、大気圧及び流路下流部９２の内圧Ｐ２より大きい一定の値になっている。一方の流路下流部９２の内圧Ｐ２は変化し、その内圧Ｐ２の変化が所定の範囲に収まるように差圧弁１０が以下のように作動する。 Here, the internal pressure P1 of the flow path upstream portion 91 is a constant value larger than the atmospheric pressure and the internal pressure P2 of the flow path downstream portion 92. The internal pressure P2 of one flow passage downstream portion 92 changes, and the differential pressure valve 10 operates as follows so that the change of the internal pressure P2 falls within a predetermined range.

即ち、初期状態から流路下流部９２の内圧Ｐ２と共に内圧保持空間９３の内圧Ｐ３が徐々に低くなり、内圧保持空間９３と流路上流部９１との差圧ΔＰが第１基準差圧ΔＰ１０を超えると、図２に示すように第２弁体５９が閉弁位置から上昇して第２弁口５２が開く。すると、流路上流部９１の流体が内圧保持空間９３に流れ込み、内圧保持空間９３の内圧Ｐ３が流路上流部９１の内圧Ｐ１に近づき、図３に示すように、第１弁体３０が上昇して第１弁口２４が開くと共に、第２弁体５９が降下して第２弁口５２が閉じる（図４参照）。 That is, the internal pressure P3 of the internal pressure holding space 93 gradually decreases with the internal pressure P2 of the flow path downstream portion 92 from the initial state, and the differential pressure ΔP between the internal pressure holding space 93 and the flow path upstream portion 91 becomes the first reference differential pressure ΔP10. If it exceeds, as shown in FIG. 2, the 2nd valve body 59 will rise from a valve closing position, and the 2nd valve port 52 will open. Then, the fluid in the flow path upstream portion 91 flows into the internal pressure holding space 93, the internal pressure P3 in the internal pressure holding space 93 approaches the internal pressure P1 in the flow path upstream portion 91, and as shown in FIG. Then, while the first valve port 24 is opened, the second valve body 59 is lowered and the second valve port 52 is closed (see FIG. 4).

また、第１弁口２４が開くと、流路上流部９１から小径嵌合孔部２３に流れ込んだ流体によって、小径嵌合軸部３５の下面にかかる圧力が上昇し、このことによって第１弁体３０がさらに上方に移動する。ここで、第１弁口２４の上流側の流路上流部９１より下流側の流路下流部９２が広いこと等による流体の圧力損失により、小径嵌合軸部３５に下面にかかる流路下流部９２の内圧は、流路上流部９１の内圧Ｐ１より小さくなる。これにより、内圧保持空間９３から流路下流部９２へとオリフィス１８を通って徐々に流体が流れる。よって、第２弁口５２が閉じた当初は、大径嵌合軸部３８が内圧保持空間９３の高い内圧Ｐ３を受けて第１弁体３０が開いた状態に維持されるが、時間の経過と共に内圧保持空間９３の内圧が徐々に下がって第１弁体３０を上方に押し上げる力も徐々に下がる。そして、第１弁体３０が徐々に降下してやがて第１弁口２４が閉じ、差圧弁１０が初期状態に戻る（図１参照）。 Further, when the first valve port 24 is opened, the pressure applied to the lower surface of the small diameter fitting shaft 35 is increased by the fluid flowing from the flow path upstream portion 91 into the small diameter fitting hole 23, thereby causing the first valve The body 30 moves further upward. Here, due to the pressure loss of fluid due to the flow passage downstream portion 92 on the downstream side of the flow passage upstream portion 91 on the upstream side of the first valve port 24 being wider, the flow passage downstream applied to the lower surface of the small diameter fitting shaft 35 The internal pressure of the portion 92 is smaller than the internal pressure P1 of the flow channel upstream portion 91. Thereby, the fluid gradually flows from the internal pressure holding space 93 to the flow passage downstream portion 92 through the orifice 18. Therefore, at the beginning of closing of the second valve port 52, the large diameter fitting shaft 38 receives the high internal pressure P3 of the internal pressure holding space 93, and the first valve body 30 is maintained in the open state. At the same time, the internal pressure of the internal pressure holding space 93 gradually decreases, and the force for pushing the first valve body 30 upward also gradually decreases. Then, the first valve body 30 gradually descends and eventually the first valve port 24 closes, and the differential pressure valve 10 returns to the initial state (see FIG. 1).

このように本実施形態の差圧弁１０では、特別空間１７を含む内圧保持空間９３に流路上流部９１の内圧Ｐ１の流体を閉じ込め、その内圧保持空間９３の内圧Ｐ３を利用して第１弁体３０が開き、内圧保持空間９３の閉じ込められた流体がオリフィス１８を通して流路下流部９２側に徐々に抜けるように構成したことで、第１弁体３０が開いてから即座に閉じることが防がれる。即ち、本実施形態の差圧弁１０によれば、ハンチング現象が防がれ、従来より静粛性が高くなる。 As described above, in the differential pressure control valve 10 of the present embodiment, the fluid of the internal pressure P1 of the flow path upstream portion 91 is confined in the internal pressure holding space 93 including the special space 17, and the first valve is utilized using the internal pressure P3 of the internal pressure holding space 93. By configuring the body 30 to open and the trapped fluid in the internal pressure holding space 93 to gradually come out through the orifice 18 toward the flow passage downstream portion 92, it is prevented that the first valve body 30 is opened and then closed immediately. It is broken. That is, according to the differential pressure control valve 10 of the present embodiment, the hunting phenomenon is prevented, and the quietness becomes higher than in the prior art.

［他の実施形態］
本発明は、前記実施形態に限定されるものではなく、上記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。 [Other embodiments]
The present invention is not limited to the above-described embodiment, and can be implemented with various modifications other than those described above without departing from the scope of the invention.

１０差圧弁
１１ベース部材
１２バルブボディ
１５圧縮コイルバネ（第１付勢手段）
１６流路
１６Ａ屈曲部
１７特別空間
１８オリフィス
２２大径嵌合孔部
２２Ｄ段差面
２３小径嵌合孔部
２４第１弁口
３０第１弁体
３５小径嵌合軸部
３５Ａリング収容溝
３６遊嵌合軸部
３８大径嵌合軸部
４１環状シール（シール部材）
４３Ｃリング
５０縦孔（直線部）
５１横孔
５２第２弁口
５４流体導入路
５４Ａ流入開口
５４Ｂ連通開口
５８圧縮コイルバネ（第２付勢手段）
５９第２弁体
９１流路上流部
９２流路下流部 DESCRIPTION OF SYMBOLS 10 Differential pressure valve 11 Base member 12 Valve body 15 Compression coil spring (1st biasing means)
DESCRIPTION OF SYMBOLS 16 flow path 16A bending part 17 special space 18 orifice 22 large diameter fitting hole 22D step surface 23 small diameter fitting hole 24 first valve port 30 first valve body 35 small diameter fitting shaft 35A ring accommodation groove 36 loose fitting Joint shaft part 38 Large diameter fitting shaft part 41 Annular seal (seal member)
43 C ring 50 vertical hole (straight section)
51 horizontal hole 52 second valve port 54 fluid introduction path 54A inflow opening 54B communication opening 58 compression coil spring (second biasing means)
59 Second valve body 91 Channel upstream portion 92 Channel downstream portion

Claims

A base member (11) having a bent channel (16);
A first valve port (24) formed by throttling the upstream side of the bent portion (16A) of the flow path (16);
A small-diameter fitting hole (23) formed on the opposite side of the first valve port (24) across the bent portion (16A) of the base member (11);
A large diameter fitting formed on the base member (11) on the side away from the first valve port (24) from the small diameter fitting hole (23) and having a larger inside diameter than the small diameter fitting hole (23) A hole (22),
A small-diameter fitting shaft portion (35) that fits into the small-diameter fitting hole portion (23) and a large-diameter fitting shaft portion (38) that fits into the large-diameter fitting hole portion (22). A first valve body (30) which linearly moves relative to the base member (11) and opens and closes the first valve port (24);
First biasing means (15) for biasing the first valve body (30) toward the valve closing side;
A special space (17) sandwiched between the step surface (22D) of the large-diameter fitting hole (22) with the small-diameter fitting hole (23) and the large-diameter fitting shaft (38). )When,
The first valve body (30) has an inflow opening (54A) at one end that opens to a surface facing the first valve port (24), and a communication opening that communicates with the special space (17) ( A fluid introduction path (54) having 54B) at the other end;
A second valve port (52) provided in the middle of the fluid introduction path (54) through which all of the fluid flowing from the inflow opening (54A) to the communication opening (54B) passes;
A second valve body (59) that opens and closes the second valve port (52) by contacting and separating from the second valve port (52) from the downstream side;
Second biasing means (58) for biasing the second valve body (59) toward the valve closing side;
A seal member (41) for sealing between the inner peripheral surface of the large-diameter fitting hole (22) and the outer peripheral surface of the large-diameter fitting shaft portion (38);
And an orifice (18) for always communicating the special space (17) downstream of the first valve port (24) in the flow path (16);
From the state where the first valve body (30) and the second valve body (59) are closed, the second valve body (59) is connected to the first valve port (24) of the flow path (16). The first valve body (30) is opened due to a change in differential pressure between the upstream side and the downstream side, and the pressure in the special space (17) is increased by opening the second valve body (59). A differential pressure valve (10) which opens due to the change of the pressure on the downstream side of the flow passage (16) to the pressure on the upstream side .

The differential pressure valve (10) according to claim 1, wherein the outer diameter of the small diameter fitting shaft (35) is larger than the diameter of the first valve port (24).

A ring accommodating groove (35A) formed on an outer peripheral surface of the small diameter fitting shaft (35);
A C ring (43) accommodated in the ring accommodating groove (35A),
The differential pressure valve (10) according to claim 1 or 2, wherein a notch provided in the C-ring (43) is the orifice (18).

The fluid introduction passage (54) is provided with a straight portion (50) linearly extending in parallel with the central axis of the first valve port (24), and the second valve port is provided in the straight portion (50). Differential pressure valve (10) according to any one of the preceding claims, wherein (52) is arranged.

The first valve body (30) has a smaller diameter than the small diameter fitting shaft portion (35) between the small diameter fitting shaft portion (35) and the large diameter fitting shaft portion (38). A loose fitting shaft portion (36) that is loosely fitted in the fitting hole portion (23) is provided,
The differential pressure valve (10) according to any one of claims 1 to 4, wherein the communication opening (54B) opens on an outer peripheral surface of the loose fitting shaft portion (36).

The surface according to any one of claims 1 to 5, wherein the surface of the first valve body (30) opposite to the surface facing the first valve port (24) receives atmospheric pressure. Differential pressure valve (10).