JP6527268B1

JP6527268B1 - Rodless check valve

Info

Publication number: JP6527268B1
Application number: JP2018078791A
Authority: JP
Inventors: 藤田　典弘; 典弘藤田
Original assignee: Nakakin Co Ltd
Current assignee: Nakakin Co Ltd
Priority date: 2018-04-17
Filing date: 2018-04-17
Publication date: 2019-06-05
Anticipated expiration: 2038-04-17
Also published as: JP2019184028A

Abstract

【課題】逆止弁としての機能を十分に発揮することができるロッドレス逆止弁を提供することを目的としている。【解決手段】ロッドレス逆止弁１は、第１接続部２１と、弁座２２と、第１フランジ部２３とを有する第１本体部２と、筒状部３１と、第２フランジ部３２と、第２接続部３３とを有する第２本体部３と、弁座２２に進退自在かつ抜脱不能に装着される有底筒状の弁体４１と、弁体４１の他端部に突出して複数設けられる複数の突出部４２とを有する弁部材４と、弁体４１を第１フランジ部２３の他端部に向けて付勢するコイルばね５と、第１フランジ部２３の他端部及び筒状部３１の一端部と弁体４１の筒部４１ａとの間の隙間Ｅを密閉可能に介装されるパッキング６とを備えている。【選択図】図２An object of the present invention is to provide a rodless check valve capable of sufficiently exhibiting the function as a check valve. A rodless check valve (1) includes a first body (2) having a first connection portion (21), a valve seat (22) and a first flange portion (23), a cylindrical portion (31) and a second flange portion (32). A second main body 3 having a second connection portion 33, a bottomed cylindrical valve body 41 attached to the valve seat 22 so as to be retractable and non-removable, and the other end of the valve body 41 A valve member 4 having a plurality of projections 42 provided in a plurality, a coil spring 5 urging the valve body 41 toward the other end of the first flange portion 23, the other end of the first flange portion 23, A packing 6 is provided so as to seal the gap E between one end of the cylindrical portion 31 and the cylindrical portion 41 a of the valve body 41. [Selected figure] Figure 2

Description

本発明は、流体の流入圧力（流量）に応じて、流体の流入を制限する閉塞姿勢と、流体の流入を許容する開放姿勢と、を切り替えるロッドレス逆止弁に関する。 The present invention relates to a rodless check valve that switches between a closed attitude that restricts the inflow of fluid and an open attitude that allows the inflow of fluid according to the inflow pressure (flow rate) of the fluid.

従来の逆止弁として、例えば、スプリングディスク式の逆止弁が知られている（例えば、特許文献１参照）。このようなスプリングディスク式の逆止弁は、図４に示すような構成となっている。 As a conventional non-return valve, for example, a spring disc type non-return valve is known (see, for example, Patent Document 1). Such a spring disc type non-return valve is configured as shown in FIG.

すなわち、一般的なスプリングディスク式の逆止弁１０１は、一端部（図示左端部）に流体ｆ１が流入する流入口１２１ａと、他端部（図示右端部）が開口する開口部１２１ｂと、を有する円筒状の第１接続部１２１と、第１接続部１２１の他端部から径方向外側に延びるとともに、第１接続部１２１の他端部から径方向外側に延びる立ち上がり部分の他端側に弁座１２２ａを有するドーナツ板状の第１フランジ部１２２と、第１フランジ部１２２の外周部から他端側に円筒状に延びる第１筒状部１２３と、を備える第１本体部１０２と、一端部が第１筒状部１２３の他端部に着脱可能に連結され、他端側に円筒状に延びる第２筒状部１３１と、第２筒状部１３１の他端部から径方向内側に延びるドーナツ板状の第２フランジ部１３２と、一端部が第２フランジ部１３２の他端部に接続され、他端部に流体ｆ１が流出する流出口１３３ａを有する円筒状の第２接続部１３３と、を備える第２本体部１０３と、第１筒状部１２３と第２筒状部１３１との連結部分の内周側に装着され、中央部に形成された円筒状の支持孔１４１と、支持孔１４１の周囲に複数形成され、流体ｆ１が流通可能な複数の連通孔１４２と、を有する円板状のばね受け部（スペーサ）１０４と、第１フランジ部１２２の弁座１２２ａの他端側に進退自在に設けられ、一端部に設けられ弁座１２２ａに押圧接触して対向する第１接続部１２１の開口部１２１ｂを覆う円盤状の弁体１５１と、弁体１５１の他端部の中央部に突出して設けられ、ばね受け部１０４の支持孔１４１に挿通される円柱状の弁棒（ロッド）１５２と、を備える弁部材１０５と、一端部が弁棒１５２の周囲に装着され、弁体１５１の他端部に接触配置されるとともに、他端部がばね受け部１０４の一端部に圧縮状態で接触配置され、弁体１５１を弁座１２２ａに向けて付勢するコイルばね１０６と、備えている。 That is, a general spring disc type check valve 101 has an inlet 121a into which the fluid f1 flows in at one end (left end in the drawing) and an opening 121b in which the other end (right end in the drawing) opens. On the other end side of a cylindrical first connection portion 121 and a rising portion extending radially outward from the other end of the first connection portion 121 and extending radially outward from the other end of the first connection portion 121 A first body portion 102 having a doughnut-plate-shaped first flange portion 122 having a valve seat 122a, and a first cylindrical portion 123 cylindrically extending from the outer peripheral portion of the first flange portion 122 to the other end side; One end is detachably connected to the other end of the first cylindrical portion 123, and the second cylindrical portion 131 cylindrically extends to the other end, and radially inward from the other end of the second cylindrical portion 131 A donut plate-like second flange portion 132 extending A second main body portion 103 having a cylindrical second connection portion 133 connected to the other end portion of the second flange portion 132 and having an outflow port 133a from which the fluid f1 flows out at the other end portion; A plurality of cylindrical support holes 141 are provided on the inner peripheral side of the connection portion between the cylindrical portion 123 and the second cylindrical portion 131, and a plurality of cylindrical support holes 141 are formed in the central portion. A disk-shaped spring receiving portion (spacer) 104 having a plurality of flowable communication holes 142, and the other end side of the valve seat 122a of the first flange portion 122 is provided at one end portion. A disc-shaped valve body 151 covering the opening 121b of the first connection portion 121 opposed to the valve seat 122a in pressure contact with the valve seat 122a and a central portion of the other end of the valve body 151 A cylindrical valve rod (rod) inserted into the support hole 141 And a valve member 105 having one end portion mounted on the periphery of the valve rod 152 and disposed in contact with the other end portion of the valve body 151, and the other end portion compressed in one end portion of the spring receiving portion 104 And a coil spring 106 for biasing the valve body 151 toward the valve seat 122a.

かくして、上記のように構成される逆止弁１０１は、上流側の流体ｆ１の圧力が下流側の流体ｆ１の圧力よりも低いとき、コイルばね１０６によって付勢された弁体１５１が弁座１２２ａを閉塞することによって、流体ｆ１の流入を制限する閉塞姿勢と、上流側の流体ｆ１の圧力が下流側の流体ｆ１の圧力よりも高いとき、弁体１５１がコイルばね１０６の付勢力に抗して弁座１２２ａから離間して弁座１２２ａを開放することによって、流体ｆ１の流入を許容する開放姿勢と、を切り替えるようになっている。 Thus, in the check valve 101 configured as described above, when the pressure of the upstream fluid f1 is lower than the pressure of the downstream fluid f1, the valve body 151 biased by the coil spring 106 has the valve seat 122a. The valve body 151 resists the biasing force of the coil spring 106 when the closed posture restricts the inflow of the fluid f1 and the pressure of the upstream fluid f1 is higher than the pressure of the downstream fluid f1. By opening the valve seat 122a by separating it from the valve seat 122a, it is possible to switch between an open position allowing the inflow of the fluid f1.

特公昭５０−１０８６号公報Japanese Patent Publication No. 50-1086

しかしながら、上記従来の逆止弁１０１では、弁棒１５２がばね受け部１０４の支持孔１４１に挿通されているから、例えば、流体ｆ１の圧力変動が頻繁に発生し、閉塞姿勢と開放姿勢との切り替えが短時間に繰り返し行われるとき（いわゆる、チャタリングが発生するとき）、弁棒１５２が径方向に激しく振動してばね受け部１０４の支持孔１４１に衝突し、弁棒１５２及びばね受け部１０４の支持孔１４１が摩耗して損傷することがある。しかるに、このように弁棒１５２及びばね受け部１０４の支持孔１４１が摩耗して損傷すると、弁体１５１及び弁棒１５２が弁座１２２ａに対して傾斜した方向に進退することとなるから、閉塞姿勢において、弁体１５１と弁座１２２ａとの間に隙間Ｅ１が生成され、弁体１５１が弁座１２２ａを完全に閉塞することができず、もって、逆止弁としての機能を十分に発揮することができないといった問題があった。 However, in the conventional check valve 101, since the valve rod 152 is inserted through the support hole 141 of the spring receiving portion 104, for example, pressure fluctuation of the fluid f1 frequently occurs, and the closed attitude and the open attitude are different. When the switching is repeatedly performed in a short time (so-called chattering), the valve rod 152 vibrates radially and collides with the support hole 141 of the spring receiving portion 104, and the valve rod 152 and the spring receiving portion 104. The support holes 141 may be worn and damaged. However, when the valve rod 152 and the support hole 141 of the spring receiving portion 104 are worn and damaged in this manner, the valve body 151 and the valve rod 152 move back and forth in the inclined direction with respect to the valve seat 122a. In the posture, the gap E1 is generated between the valve body 151 and the valve seat 122a, and the valve body 151 can not completely close the valve seat 122a, thereby sufficiently exerting the function as a check valve. There was a problem that I could not do it.

そこで、本発明は、上述の問題に鑑み、逆止弁としての機能を十分に発揮することができるロッドレス逆止弁を提供することを目的としている。 Then, in view of the above-mentioned problem, an object of the present invention is to provide a rodless check valve which can fully exhibit a function as a check valve.

上記本発明の目的は、以下の手段によって達成される。なお、括弧内は、後述する実施形態の参照符号を付したものであるが、本発明はこれに限定されるものではない。 The object of the present invention is achieved by the following means. In addition, although the inside of a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

請求項１の発明に係るロッドレス逆止弁（１）は、流体（ｆ）の流入側に配置される第１本体部（２）と、
前記流体（ｆ）の流出側に配置される第２本体部（３）と、
前記第２本体部（３）の内部に設けられる弁部材（４）と、
前記弁部材（４）を付勢する付勢部材（コイルばね５）と、
シール部材（パッキング６）と、を備え、
前記第１本体部（２）は、
外周部（２２ａ）に設けられ前記流体（ｆ）が流通可能な第１連通孔（２２ｂ）と、前記流出側の他端部が開口する開口部（２２ｃ）と、を有する筒状の弁座（２２）と、
前記弁座（２２）に設けられる第１フランジ部（２３）と、を有し、
前記第２本体部（３）は、
前記流入側の一端部が前記第１フランジ部（２３）の前記流出側の他端部に設けられると共に、内周部に前記弁座（２２）が配置され、さらに、前記第１連通孔（２２ｂ）を介して前記流体（ｆ）が流通可能な内部空間（Ｃ）を有する筒状部（３１）と、
前記筒状部（３１）の前記流出側の他端部に設けられる第２フランジ部（３２）と、を有し、
前記弁部材（４）は、
前記弁座（２２）の外周部に進退自在かつ抜脱不能に装着され、前記第１連通孔（２２ｂ）を開閉可能に前記弁座（２２）の外周部（２２ａ）を覆う筒部（４１ａ）と、該筒部（４１ａ）の前記流出側の他端部に設けられ前記弁座（２２）の開口部（２２ｃ）を覆う底部（４１ｂ）と、を有する弁体（４１）と、
前記弁体（４１）の前記流出側の他端部に突出して複数設けられ、夫々の間に前記流体（ｆ）が流通可能な第２連通孔（４２ａ）を有する複数の突出部（４２）と、を有し、
前記付勢部材（コイルばね５）は、
前記流入側の一端部が前記複数の突出部（４２）の周囲に装着され、前記弁体（４１）の前記流出側の他端部に接触配置されるとともに、前記流出側の他端部が前記第２フランジ部（３２）の前記流入側の一端部に圧縮状態で接触配置され、前記弁体（４１）を前記第１フランジ部（２３）の前記流出側の他端部に向けて付勢し、
前記シール部材（パッキング６）は、
前記第１フランジ部（２３）の前記流出側の他端部及び／又は前記筒状部（３１）の前記流入側の一端部と、前記弁体（４１）の前記筒部（４１ａ）と、の間の隙間を密閉可能に介装し、
前記弁座（２２）の外周部（２２ａ）は、外形が前記流出側に向かって縮径するテーパ形状に形成され、
前記弁体（４１）の前記筒部（４１ａ）の内周部（４１ｃ）は、内形が前記流出側に向かって縮径するテーパ形状に形成されてなることを特徴としている。 The rodless check valve (1) according to the invention of claim 1 comprises a first body (2) disposed on the inflow side of the fluid (f);
A second body (3) disposed on the outflow side of the fluid (f);
A valve member (4) provided inside the second main body (3);
A biasing member (coil spring 5) for biasing the valve member (4);
And a sealing member (packing 6),
The first body portion (2) is
A cylindrical valve seat having a first communication hole (22b) provided in the outer peripheral portion (22a) and capable of circulating the fluid (f), and an opening (22c) opened by the other end on the outflow side (22),
And a first flange portion (23) provided on the valve seat (22);
The second main body (3) is
One end on the inflow side is provided at the other end on the outflow side of the first flange portion (23), the valve seat (22) is disposed on the inner peripheral portion, and the first communication hole ( 22b) a tubular portion (31) having an internal space (C) through which the fluid (f) can flow.
And a second flange portion (32) provided at the other end of the cylindrical portion (31) on the outflow side,
The valve member (4) is
A cylindrical portion (41a) which is mounted on the outer periphery of the valve seat (22) so as to be able to move forward and backward and can not be removed, and which covers the outer periphery (22a) of the valve seat (22) so as to open and close the first communication hole A valve body (41) having a bottom portion (41b) provided at the other end of the outflow side of the cylindrical portion (41a) and covering the opening (22c) of the valve seat (22);
A plurality of projecting portions (42) having a plurality of second communication holes (42a) which are provided in a projecting manner at the other end on the outflow side of the valve body (41), and between which the fluid (f) can flow. And
The biasing member (coil spring 5) is
One end on the inflow side is mounted around the plurality of protrusions (42), and is disposed in contact with the other end on the outflow side of the valve body (41), and the other end on the outflow side is The second flange portion (32) is disposed in contact with one end portion on the inflow side of the second flange portion (32) in a compressed state, and the valve body (41) is directed toward the other end portion on the outflow side of the first flange portion (23). Turn
The seal member (packing 6) is
The other end of the outflow side of the first flange portion (23) and / or the one end of the inflow side of the cylindrical portion (31), and the cylindrical portion (41a) of the valve body (41); It interposed a gap between sealably,
The outer peripheral portion (22a) of the valve seat (22) is formed in a tapered shape whose outer diameter decreases toward the outflow side,
The inner peripheral portion (41c) of the cylindrical portion (41a) of the valve body (41) is characterized in that the inner shape is formed in a tapered shape whose diameter decreases toward the outflow side .

請求項２の発明に係るロッドレス逆止弁（１）は、流体（ｆ）の流入側に配置される第１本体部（２）と、
前記流体（ｆ）の流出側に配置される第２本体部（３）と、
前記第２本体部（３）の内部に設けられる弁部材（４）と、
前記弁部材（４）を付勢する付勢部材（コイルばね５）と、
シール部材（パッキング６）と、を備え、
前記第１本体部（２）は、
外周部（２２ａ）に設けられ前記流体（ｆ）が流通可能な第１連通孔（２２ｂ）と、前記流出側の他端部が開口する開口部（２２ｃ）と、を有する筒状の弁座（２２）と、
前記弁座（２２）に設けられる第１フランジ部（２３）と、を有し、
前記第２本体部（３）は、
前記流入側の一端部が前記第１フランジ部（２３）の前記流出側の他端部に設けられると共に、内周部に前記弁座（２２）が配置され、さらに、前記第１連通孔（２２ｂ）を介して前記流体（ｆ）が流通可能な内部空間（Ｃ）を有する筒状部（３１）と、
前記筒状部（３１）の前記流出側の他端部に設けられる第２フランジ部（３２）と、を有し、
前記弁部材（４）は、
前記弁座（２２）の外周部に進退自在かつ抜脱不能に装着され、前記第１連通孔（２２ｂ）を開閉可能に前記弁座（２２）の外周部（２２ａ）を覆う筒部（４１ａ）と、該筒部（４１ａ）の前記流出側の他端部に設けられ前記弁座（２２）の開口部（２２ｃ）を覆う底部（４１ｂ）と、を有する弁体（４１）と、
前記弁体（４１）の前記流出側の他端部に突出して複数設けられ、夫々の間に前記流体（ｆ）が流通可能な第２連通孔（４２ａ）を有する複数の突出部（４２）と、を有し、
前記付勢部材（コイルばね５）は、
前記流入側の一端部が前記複数の突出部（４２）の周囲に装着され、前記弁体（４１）の前記流出側の他端部に接触配置されるとともに、前記流出側の他端部が前記第２フランジ部（３２）の前記流入側の一端部に圧縮状態で接触配置され、前記弁体（４１）を前記第１フランジ部（２３）の前記流出側の他端部に向けて付勢し、
前記シール部材（パッキング６）は、
前記第１フランジ部（２３）の前記流出側の他端部及び／又は前記筒状部（３１）の前記流入側の一端部と、前記弁体（４１）の前記筒部（４１ａ）と、の間の隙間を密閉可能に介装し、
前記第１フランジ部（２３）は、前記弁体（４１）の前記筒部（４１ａ）が挿入可能な溝部（２３ａ）を有し、
前記溝部（２３ａ）の内周部（２３ａ２）は、内形が前記流出側に向かって拡形するテーパ形状に形成され、
前記弁体（４１）の前記筒部（４１ａ）の外周部（４１ｄ）は、外形が前記流出側に向かって拡形するテーパ形状に形成されてなることを特徴としている。 The rodless check valve (1) according to the invention of claim 2 comprises a first body (2) disposed on the inflow side of the fluid (f);
A second body (3) disposed on the outflow side of the fluid (f);
A valve member (4) provided inside the second main body (3);
A biasing member (coil spring 5) for biasing the valve member (4);
And a sealing member (packing 6),
The first body portion (2) is
A cylindrical valve seat having a first communication hole (22b) provided in the outer peripheral portion (22a) and capable of circulating the fluid (f), and an opening (22c) opened by the other end on the outflow side (22),
And a first flange portion (23) provided on the valve seat (22);
The second main body (3) is
One end on the inflow side is provided at the other end on the outflow side of the first flange portion (23), the valve seat (22) is disposed on the inner peripheral portion, and the first communication hole ( 22b) a tubular portion (31) having an internal space (C) through which the fluid (f) can flow.
And a second flange portion (32) provided at the other end of the cylindrical portion (31) on the outflow side,
The valve member (4) is
A cylindrical portion (41a) which is mounted on the outer periphery of the valve seat (22) so as to be able to move forward and backward and can not be removed, and which covers the outer periphery (22a) of the valve seat (22) so as to open and close the first communication hole A valve body (41) having a bottom portion (41b) provided at the other end of the outflow side of the cylindrical portion (41a) and covering the opening (22c) of the valve seat (22);
A plurality of projecting portions (42) having a plurality of second communication holes (42a) which are provided in a projecting manner at the other end on the outflow side of the valve body (41), and between which the fluid (f) can flow. And
The biasing member (coil spring 5) is
One end on the inflow side is mounted around the plurality of protrusions (42), and is disposed in contact with the other end on the outflow side of the valve body (41), and the other end on the outflow side is The second flange portion (32) is disposed in contact with one end portion on the inflow side of the second flange portion (32) in a compressed state, and the valve body (41) is directed toward the other end portion on the outflow side of the first flange portion (23). Turn
The seal member (packing 6) is
The other end of the outflow side of the first flange portion (23) and / or the one end of the inflow side of the cylindrical portion (31), and the cylindrical portion (41a) of the valve body (41); Interposing the gap between the
The first flange portion (23) has a groove (23a) into which the cylindrical portion (41a) of the valve body (41) can be inserted.
An inner peripheral portion (23a2) of the groove portion (23a) is formed in a tapered shape whose inner shape expands toward the outflow side,
An outer peripheral portion (41d) of the cylindrical portion (41a) of the valve body (41) is characterized in that the outer shape is formed in a tapered shape expanding toward the outflow side .

次に、本発明の効果について、図面の参照符号を付して説明する。なお、括弧内は、後述する実施形態の参照符号を付したものであるが、本発明はこれに限定されるものではない。 Next, the effects of the present invention will be described with reference to the drawings. In addition, although the inside of a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

請求項１の発明によれば、弁体（４１）の筒部（４１ａ）が、弁座（２２）の外周部（２２ａ）に進退自在かつ抜脱不能に装着され、外周部（２２ａ）に流体（ｆ）が流通可能な第１連通孔（２２ｂ）を開閉可能に弁座（２２）の外周部（２２ａ）を覆うようになっている。これにより、従来のように弁棒（ロッド）及びばね受け部の支持孔を設ける必要がなくなるから、閉塞姿勢において、弁体（４１）が弁座（２２）を完全に閉塞することができ、もって、逆止弁としての機能を十分に発揮することができる。
さらに、請求項１の発明によれば、弁座（２２）の外周部（２２ａ）の外形が、流出側に向かって縮径するテーパ形状に形成され、弁体（４１）の筒部（４１ａ）の内周部（４１ｃ）の内形が、流出側に向かって縮径するテーパ形状に形成されているから、弁体（４１）の弁座（２２）の外周部（２２ａ）に対するがたつきを低減することができ、もって、逆止弁としての機能をさらに十分に発揮することができる。 According to the invention of claim 1, the cylindrical portion (41a) of the valve body (41) is attached to the outer peripheral portion (22a) of the valve seat (22) so as to be able to move forward and backward and can not be removed. The outer peripheral portion (22a) of the valve seat (22) is covered so as to be able to open and close the first communication hole (22b) through which the fluid (f) can flow. As a result, it is not necessary to provide support holes for the valve rod (rod) and the spring receiver as in the prior art, so that the valve body (41) can completely close the valve seat (22) in the closed position. Therefore, the function as a check valve can be sufficiently exhibited.
Furthermore, according to the invention of claim 1, the outer shape of the outer peripheral portion (22a) of the valve seat (22) is formed in a tapered shape in which the diameter decreases toward the outflow side, and the cylindrical portion (41a) of the valve body (41) Of the valve body (41) against the outer peripheral portion (22a) of the valve seat (22). Stickiness can be reduced, so that the function as a check valve can be more fully exhibited.

請求項２の発明によれば、弁体（４１）の筒部（４１ａ）が、弁座（２２）の外周部（２２ａ）に進退自在かつ抜脱不能に装着され、外周部（２２ａ）に流体（ｆ）が流通可能な第１連通孔（２２ｂ）を開閉可能に弁座（２２）の外周部（２２ａ）を覆うようになっている。これにより、従来のように弁棒（ロッド）及びばね受け部の支持孔を設ける必要がなくなるから、閉塞姿勢において、弁体（４１）が弁座（２２）を完全に閉塞することができ、もって、逆止弁としての機能を十分に発揮することができる。
さらに、請求項２の発明によれば、第１フランジ部（２３）が、弁体（４１）の筒部（４１ａ）が挿入可能な溝部（２３ａ）を有しているから、閉塞姿勢において、弁体（４１）の筒部（４１ａ）が第１連通孔（２２ｂ）をより完全に閉塞することができ、もって、逆止弁としての機能をより十分に発揮することができる。さらに、請求項３の発明によれば、溝部（２３ａ）の内周部（２３ａ２）の内形が、他端側に向けて拡径するテーパ形状に形成され、弁体（４１）の筒部（４１ａ）の外周部（４１ｄ）の外形が、他端側に向けて拡径するテーパ形状に形成されているから、弁体（４１）の溝部（２３ａ）の内周部（２３ａ２）に対するがたつきを低減することができ、もって、逆止弁としての機能をさらに十分に発揮することができる。 According to the second aspect of the present invention, the cylindrical portion (41a) of the valve body (41) is mounted on the outer peripheral portion (22a) of the valve seat (22) so as to be able to move forward and backward and can not be removed. The outer peripheral portion (22a) of the valve seat (22) is covered so as to be able to open and close the first communication hole (22b) through which the fluid (f) can flow. As a result, it is not necessary to provide support holes for the valve rod (rod) and the spring receiver as in the prior art, so that the valve body (41) can completely close the valve seat (22) in the closed position. Therefore, the function as a check valve can be sufficiently exhibited.
Furthermore, according to the invention of claim 2, the first flange portion (23) has a groove portion (23a) into which the cylindrical portion (41a) of the valve body (41) can be inserted. The cylindrical portion (41a) of the valve body (41) can more completely close the first communication hole (22b), and thereby the function as a check valve can be more fully exhibited. Furthermore, according to the invention of claim 3, the inner shape of the inner peripheral portion (23a2) of the groove portion (23a) is formed in a tapered shape in which the diameter increases toward the other end side, and the cylindrical portion of the valve body (41) Since the outer shape of the outer peripheral portion (41d) of (41a) is formed in a tapered shape expanding toward the other end side, the inner peripheral portion (23a2) of the groove portion (23a) of the valve body (41) The tackiness can be reduced, and thus the function as a check valve can be more fully exhibited.

本発明の一実施形態に係るロッドレス逆止弁を例示し、第２本体部を取り外した状態を示す分解斜視図である。It is a disassembled perspective view which illustrates the rodless check valve which concerns on one Embodiment of this invention, and shows the state which removed the 2nd main-body part. 閉塞姿勢における同ロッドレス逆止弁の縦断面図である。It is a longitudinal cross-sectional view of the same rodless check valve in a closed posture. 開放姿勢における同ロッドレス逆止弁の縦断面図である。It is a longitudinal cross-sectional view of the same rodless check valve in an open posture. 従来の実施形態に係るロッドレス逆止弁の縦断面図である。It is a longitudinal cross-sectional view of the rodless non-return valve concerning the conventional embodiment.

以下に、本発明に係るロッドレス逆止弁の一実施形態について、図面を参照して具体的に説明する。なお、以下の説明において、上下左右の方向を示す場合は、図示正面から見た場合の上下左右をいうものとする。 Hereinafter, an embodiment of a rodless check valve according to the present invention will be specifically described with reference to the drawings. In addition, in the following description, when showing the direction of the upper and lower sides and right and left, it shall mean the upper and lower sides and left and right when it sees from illustration front.

図２及び図３に示すように、ロッドレス逆止弁１は、流体ｆの流入圧力（流量）に応じて、流体ｆの流入を制限する閉塞姿勢（図２参照）と、流体ｆの流入を許容する開放姿勢（図３参照）と、を切り替えるものである。より具体的に説明すると、このロッドレス逆止弁１は、図２及び図３に示すように、第１本体部２と、第２本体部３と、弁部材４と、コイルばね５（付勢部材の一例）と、パッキング６（シール部材の一例）と、を備えている。以下、この各構成について詳しく説明することとする。 As shown in FIGS. 2 and 3, the rodless check valve 1 has a closed posture (see FIG. 2) that restricts the inflow of the fluid f according to the inflow pressure (flow rate) of the fluid f, and the inflow of the fluid f. It is to switch between an open position to allow (see FIG. 3). More specifically, as shown in FIGS. 2 and 3, the rodless check valve 1 includes a first main body 2, a second main body 3, a valve member 4 and a coil spring 5 (biased. An example of a member) and packing 6 (an example of a sealing member) are provided. Each of these configurations will be described in detail below.

＜第１本体部の説明＞
第１本体部２は、図１〜図３に示すように、一端部（図２及び図３に示す流入側）に流体ｆが流入する流入口２１ａを有する筒状の第１接続部２１と、第１接続部２１の他端部（図２及び図３に示す流出側）に突出して設けられ、外周部２２ａに流体ｆが流通可能な第１連通孔２２ｂと、他端部が開口する開口部２２ｃと、を有する筒状の弁座２２と、第１接続部２１の外周部２１ｂから径方向外側に延びるドーナツ板状の第１フランジ部２３と、を備えている。なお、この第１本体部２は、例えば、耐食性及び加工性に優れたステンレス鋼（ＳＵＳ３１６Ｌ）等の合金を切削加工することによって、第１接続部２１、弁座２２、第１フランジ部２３を一体形成したものである。 <Description of First Main Body>
As shown in FIGS. 1 to 3, the first main body 2 has a cylindrical first connection portion 21 having an inlet 21 a into which the fluid f flows in at one end (inflow side shown in FIGS. 2 and 3) The first connection hole 22b is provided on the other end (the outflow side shown in FIGS. 2 and 3) of the first connection portion 21 so as to protrude, and the fluid f can flow in the outer peripheral portion 22a. A cylindrical valve seat 22 having an opening 22c, and a donut plate-shaped first flange 23 extending radially outward from the outer peripheral portion 21b of the first connection portion 21 are provided. The first main body portion 2 is formed by, for example, cutting an alloy such as stainless steel (SUS316L) having excellent corrosion resistance and workability, thereby forming the first connection portion 21, the valve seat 22, and the first flange portion 23. It is integrally formed.

ところで、この第１接続部２１は、図１〜図３に示すように、外周部２１ｂの一端部に装着される接続アダプタ（図示せず）を介して、流入口２１ａに連通可能に流入管（図示せず）を接続する円筒状の接続管であり、両端部が開口するとともに、内周部に流体ｆが流通可能な内部空間Ａを有している。 By the way, as shown in FIGS. 1 to 3, the first connection portion 21 can communicate with the inflow port 21a via a connection adapter (not shown) attached to one end of the outer peripheral portion 21b. It is a cylindrical connecting pipe for connecting (not shown), has both ends open, and has an inner space A through which fluid f can flow.

一方、弁座２２は、図１〜図３に示すように、第１接続部２１の他端部（図２及び図３に示す流出側）に突出するように第１接続部２１と一体形成された円筒状の部材であって、一端部（図２及び図３に示す流入側）が第１接続部２１の他端部の開口部に連通するように開口している。なお、この弁座２２の内径は、第１接続部２１の内径と同一となっており、この同一内径の弁座２２及び第１接続部２１は、内形が滑らかに連続する円管形状となっている。 On the other hand, as shown in FIGS. 1 to 3, the valve seat 22 is integrally formed with the first connection portion 21 so as to project to the other end (the outflow side shown in FIGS. 2 and 3) of the first connection portion 21. The one end (the inflow side shown in FIGS. 2 and 3) of the cylindrical member is open so as to communicate with the opening of the other end of the first connection portion 21. The inner diameter of the valve seat 22 is the same as the inner diameter of the first connection portion 21. The valve seat 22 of the same inner diameter and the first connection portion 21 have a circular tubular shape in which the inner shape is smoothly continuous. It has become.

しかして、上記のように形成される弁座２２は、図１〜図３に示すように、外周部２２ａの周方向に等配され夫々矩形状に貫通する複数個（例えば、４個）の第１連通孔２２ｂと、他端部が円形状に開口する開口部２２ｃと、を有し、さらに、内周部に流体ｆが流通可能な内部空間Ｂを有している。 Thus, the valve seat 22 formed as described above is, as shown in FIGS. 1 to 3, a plurality of (for example, four) valve seats which are equally distributed in the circumferential direction of the outer peripheral portion 22a and penetrate each in a rectangular shape. A first communication hole 22 b and an opening 22 c whose other end opens in a circular shape are provided, and further, an inner space B in which the fluid f can flow is provided in the inner peripheral portion.

この弁座２２の外周部２２ａには、後述する弁体４１の筒部４１ａが進退自在かつ抜脱不能に装着されている。すなわち、図２に示すように、閉塞姿勢において、弁体４１の筒部４１ａが第１フランジ部２３の他端部（図２及び図３に示す流出側）に近接する方向（左方向）に移動したとき、弁体４１の筒部４１ａが弁座２２の第１連通孔２２ｂを閉塞するようになっている。そして、図３に示すように、開放姿勢において、弁体４１の筒部４１ａが第１フランジ部２３の他端部（図２及び図３に示す流出側）から離接する方向（右方向）に移動したとき、弁体４１の筒部４１ａが弁座２２の第１連通孔２２ｂを開放するようになっている。なお、図２及び図３に示すように、閉塞姿勢及び開放姿勢において、弁座２２の開口部２２ｃは、弁体４１の底部４１ｂによって常に覆われている。このため、弁座２２の内部空間Ｂは、弁座２２の開口部２２ｃを介して筒状部３１の内部空間Ｃと連通していない。 On an outer peripheral portion 22 a of the valve seat 22, a cylindrical portion 41 a of a valve body 41 to be described later is mounted so as to be able to advance and retract and to be non-removable. That is, as shown in FIG. 2, in the closed posture, in the direction (left direction) in which the cylindrical portion 41a of the valve body 41 approaches the other end (the outflow side shown in FIGS. 2 and 3) of the first flange portion 23. When moved, the cylindrical portion 41 a of the valve body 41 closes the first communication hole 22 b of the valve seat 22. Then, as shown in FIG. 3, in the open position, in the direction (right direction) in which the cylindrical portion 41 a of the valve body 41 separates from the other end of the first flange portion 23 (the outflow side shown in FIGS. 2 and 3) When moved, the cylindrical portion 41 a of the valve body 41 opens the first communication hole 22 b of the valve seat 22. As shown in FIGS. 2 and 3, the opening 22 c of the valve seat 22 is always covered by the bottom 41 b of the valve body 41 in the closed posture and the open posture. Therefore, the internal space B of the valve seat 22 does not communicate with the internal space C of the cylindrical portion 31 through the opening 22 c of the valve seat 22.

さらに詳しく弁座２２の外周部２２ａについて説明すると、図２及び図３の上部に拡大して示すように、弁座２２の外周部２２ａは、外形が他端側（図２及び図３に示す流出側）に向かって縮径するテーパ形状に形成され、弁体４１の筒部４１ａの内周部４１ｃは、内形が他端側（図２及び図３に示す流出側）に向かって縮径するテーパ形状に形成されている。 Further, the outer periphery 22a of the valve seat 22 will be described in detail with reference to the outer periphery 22a of the valve seat 22, the outer periphery 22a of the valve seat 22 has the other end side (shown in FIGS. 2 and 3) The inner peripheral portion 41c of the cylindrical portion 41a of the valve body 41 has an inner shape that is contracted toward the other end (the outflow side shown in FIGS. 2 and 3). It is formed in a tapered shape.

ところで、弁座２２の外周部２２ａ及び弁体４１の筒部４１ａの内周部４１ｃのテーパ角は、同一であって、比較的緩やかな角度（例えば、１０度以下、本実施形態では、例えば、５度である）となっている。しかして、このように、弁座２２の外周部２２ａ及び弁体４１の筒部４１ａの内周部４１ｃのテーパ角を比較的緩やかな角度としておくことにより、弁座２２及び弁体４１の筒部４１ａの移動方向（左右方向）の長さ（ストローク）を十分に確保することができる。これにより、弁体４１の筒部４１ａが進退自在に移動する際、弁座２２の中心軸線Ｏ１（図２及び図３参照）と、筒部４１ａの中心軸線Ｏ２（図２及び図３参照）とが同一軸線上となるように進退自在に移動させることができ、もって、ガイド機構としての役割を発揮させることができる。また、本実施形態によれば、弁座２２の外周部２２ａの外形が、他端側（図２及び図３に示す流出側）に向かって縮径するテーパ形状に形成され、弁体４１の筒部４１ａの内周部４１ｃの内形が、他端側（図２及び図３に示す流出側）に向かって縮径するテーパ形状に形成されているから、弁体４１の弁座２２の外周部２２ａに対するがたつきを低減することができ、もって、逆止弁としての機能をさらに十分に発揮することができる。 The taper angles of the outer peripheral portion 22a of the valve seat 22 and the inner peripheral portion 41c of the cylindrical portion 41a of the valve body 41 are the same and relatively gentle (for example, 10 degrees or less, for example, in the present embodiment) It is 5 degrees). Thus, by setting the taper angles of the outer peripheral portion 22a of the valve seat 22 and the inner peripheral portion 41c of the cylindrical portion 41a of the valve body 41 relatively loose, the cylinders of the valve seat 22 and the valve body 41 are The length (stroke) of the moving direction (left and right direction) of the portion 41a can be sufficiently secured. Thereby, when the cylinder part 41a of the valve body 41 moves forward and backward freely, the central axis O1 of the valve seat 22 (see FIGS. 2 and 3) and the central axis O2 of the cylinder 41a (see FIGS. 2 and 3) Can be moved back and forth so that they are on the same axis, so that the role as a guide mechanism can be exhibited. Further, according to the present embodiment, the outer shape of the outer peripheral portion 22 a of the valve seat 22 is formed in a tapered shape in which the diameter decreases toward the other end side (the outflow side shown in FIGS. 2 and 3). The inner shape of the inner peripheral portion 41c of the cylindrical portion 41a is formed in a tapered shape in which the diameter decreases toward the other end (the outflow side shown in FIGS. 2 and 3). It is possible to reduce rattling with respect to the outer peripheral portion 22a, and thus it is possible to more fully exhibit the function as a check valve.

一方、第１フランジ部２３は、図１〜図３に示すように、第１接続部２１の外周部２１ｂの他端部から径方向外側に延びるように一体形成されたドーナツ板状の部材である。この第１フランジ部２３は、他端部の外縁部に、後述する筒状部３１の一端部の外縁部を突き合わせた状態で、両外縁部をクランプバンド（図示せず）で圧接することにより、筒状部３１が着脱可能に連結されるようになっている。 On the other hand, as shown in FIGS. 1 to 3, the first flange portion 23 is a donut plate member integrally formed so as to extend radially outward from the other end of the outer peripheral portion 21 b of the first connection portion 21. is there. The first flange portion 23 is brought into pressure contact with a clamp band (not shown) in a state where the outer edge portion of one end portion of the cylindrical portion 31 described later abuts on the outer edge portion of the other end portion. The tubular portion 31 is detachably connected.

また、この第１フランジ部２３は、他端部の中央部に設けられ、後述する弁体４１の筒部４１ａが挿入可能な円環状の溝部２３ａと、溝部２３ａの内周部２３ａ２の外縁部に設けられ、パッキング６の一部が装着可能な円環状の第１環状溝２３ｂと、を有している。 Further, the first flange portion 23 is provided at the center of the other end portion, and an annular groove portion 23a into which a cylinder portion 41a of the valve body 41 described later can be inserted, and an outer edge portion of an inner peripheral portion 23a2 of the groove portion 23a. And an annular first annular groove 23b to which a part of the packing 6 can be attached.

ところで、この溝部２３ａの外周部２３ａ１（内周側の内壁の外周部）は、図２及び図３の上部に拡大して示すように、外形が他端側（図２及び図３に示す流出側）に向かって縮径するテーパ形状に形成されている。この溝部２３ａの外周部２３ａ１のテーパ角は、弁座２２の外周部２２ａ及び後述する弁体４１の筒部４１ａの内周部４１ｃのテーパ角と同一であって、溝部２３ａの外周部２３ａ１の外形は、弁座２２の外周部２２ａの外形と滑らかに連続するテーパ形状に形成されている。しかるに、溝部２３ａの外周部２３ａ１の外形が、他端側（図２及び図３に示す流出側）に向かって縮径するテーパ形状に形成されているから、弁体４１の溝部２３ａの外周部２３ａ１に対するがたつきを低減することができ、もって、逆止弁としての機能をより十分に発揮させることができる。 By the way, the outer periphery 23a1 of the groove 23a (the outer periphery of the inner wall on the inner periphery) has an outer shape on the other end side (the outflow shown in FIGS. 2 and 3) as shown enlarged in the upper part of FIGS. It is formed in the taper shape which diameter-reduces toward the side). The taper angle of the outer periphery 23a1 of the groove 23a is the same as the taper angle of the outer periphery 22a of the valve seat 22 and the inner periphery 41c of the cylinder 41a of the valve body 41 described later. The outer shape is formed in a tapered shape that is smoothly continuous with the outer shape of the outer peripheral portion 22 a of the valve seat 22. However, since the outer shape of the outer peripheral portion 23a1 of the groove portion 23a is formed in a tapered shape which reduces in diameter toward the other end side (the outflow side shown in FIGS. 2 and 3), the outer peripheral portion of the groove portion 23a of the valve body 41 The rattle with respect to 23a1 can be reduced, so that the function as a check valve can be more fully exhibited.

一方、溝部２３ａの内周部２３ａ２（外周側の内壁の内周部）は、図２及び図３の上部に拡大して示すように、内形が他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成され、後述する弁体４１の筒部４１ａの外周部４１ｄは、外形が他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成されている。この溝部２３ａの内周部２３ａ２及び弁体４１の筒部４１ａの外周部４１ｄのテーパ角は同一であって、好ましくは、２５度以上４５度未満（本実施形態では、例えば、３０度）である。しかるに、本実施形態によれば、溝部２３ａの内周部２３ａ２の内形が、他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成され、弁体４１の筒部４１ａの外周部４１ｄの外形が、他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成されているから、弁体４１の溝部２３ａの内周部２３ａ２に対するがたつきを低減することができ、もって、逆止弁としての機能をさらに十分に発揮することができる。 On the other hand, the inner peripheral portion 23a2 (inner peripheral portion of the inner wall on the outer peripheral side) of the groove portion 23a has the other end side (shown in FIGS. 2 and 3) as shown enlarged in the upper part of FIGS. The outer peripheral portion 41d of the cylindrical portion 41a of the valve body 41, which will be described later, is expanded in diameter toward the other end (the outflow side shown in FIGS. 2 and 3). It is formed in a tapered shape. The taper angles of the inner peripheral portion 23a2 of the groove portion 23a and the outer peripheral portion 41d of the cylindrical portion 41a of the valve body 41 are the same, preferably 25 degrees or more and less than 45 degrees (for example, 30 degrees in this embodiment) is there. However, according to the present embodiment, the inner shape of the inner peripheral portion 23a2 of the groove portion 23a is formed in a tapered shape in which the diameter increases toward the other end side (the outflow side shown in FIGS. 2 and 3) Since the outer shape of the outer peripheral portion 41d of the cylindrical portion 41a is formed in a tapered shape in which the diameter increases toward the other end side (the outflow side shown in FIGS. 2 and 3), the inner periphery of the groove 23a of the valve body 41 The rattle with respect to the portion 23a2 can be reduced, so that the function as a check valve can be more sufficiently exhibited.

他方、第１環状溝２３ｂは、後述する弁体４１の筒部４１ａの外周部４１ｄに対向する位置に設けられた縦断面半円形状の装着溝であって、この第１環状溝２３ｂにパッキング６の一部を装着することによって、溝部２３ａの内周部２３ａ２（第１フランジ部２３の他端部）と、弁体４１の筒部４１ａと、の間の隙間Ｅを密閉することができるようになっている。 On the other hand, the first annular groove 23b is a mounting groove having a semicircular longitudinal cross section provided at a position facing the outer peripheral portion 41d of the cylinder portion 41a of the valve body 41 described later. By mounting a part of 6, the gap E between the inner peripheral portion 23a2 of the groove 23a (the other end of the first flange portion 23) and the cylindrical portion 41a of the valve body 41 can be sealed. It is supposed to be.

しかして、このように、第１フランジ部２３は、後述する弁体４１の筒部４１ａが挿入可能な溝部２３ａを有しているから、閉塞姿勢において、弁体４１の筒部４１ａが第１連通孔２２ｂをより完全に閉塞することができ、もって、逆止弁としての機能をより十分に発揮することができる。 Thus, as described above, since the first flange portion 23 has the groove portion 23a into which the cylinder portion 41a of the valve body 41 described later can be inserted, the cylinder portion 41a of the valve body 41 is the first in the closed posture. The communication hole 22b can be closed more completely, so that the function as a check valve can be more fully exhibited.

＜第２本体部の説明＞
第２本体部３は、図２及び図３に示すように、一端部が第１フランジ部２３の他端部に着脱可能に連結される円筒状の筒状部３１と、一端部が筒状部３１の他端部に着脱可能に連結され、他端部から径方向内側に延びるドーナツ板状の第２フランジ部３２と、一端部が第２フランジ部３２の他端部に一体形成され、他端部に流体ｆが流出する流出口３３ａを有する筒状の第２接続部３３と、を備えている。なお、この第２本体部３は、筒状部３１からなる部材と、第２フランジ部３２及び第２接続部３３とからなる部材と、の２部材で構成されており、夫々の部材は、例えば、第１本体部２と同一のステンレス鋼（ＳＵＳ３１６Ｌ）等の合金を切削加工することにより形成したものである。 <Description of Second Main Body>
As shown in FIGS. 2 and 3, the second main body portion 3 has a cylindrical tubular portion 31 whose one end is detachably connected to the other end of the first flange portion 23, and one end is cylindrical. A donut plate-shaped second flange 32 which is detachably connected to the other end of the portion 31 and extends radially inward from the other end, and one end is integrally formed with the other end of the second flange 32, And a cylindrical second connection portion 33 having an outlet 33a from which the fluid f flows out at the other end. The second main body portion 3 is composed of two members, a member formed of the cylindrical portion 31 and a member formed of the second flange portion 32 and the second connection portion 33, and the respective members are For example, it is formed by cutting an alloy such as stainless steel (SUS316L) that is the same as the first main body 2.

ところで、この筒状部３１は、図２及び図３に示すように、一端部が第１フランジ部２３の他端部に着脱可能に連結されると共に、内周部に弁座２２が配置され、さらに、第１連通孔２２ｂを介して流体ｆが流通可能な内部空間Ｃを有する円筒状の部材であって、内径が第１接続部２１、弁座２２、第２接続部３３の内径よりも大きい円環形状に形成されている。しかして、このように形成される筒状部３１は、一端部から径方向内側に延びるとともに、弁体４１の筒部４１ａが挿入可能な内周部３１ａ１を有するドーナツ板状の内フランジ部３１ａを有している。 By the way, as shown in FIGS. 2 and 3, the cylindrical portion 31 has one end portion detachably connected to the other end portion of the first flange portion 23 and the valve seat 22 is disposed on the inner peripheral portion. Further, it is a cylindrical member having an internal space C through which the fluid f can flow through the first communication hole 22 b, and the inner diameter is determined by the inner diameters of the first connection portion 21, the valve seat 22, and the second connection portion 33. Is also formed in a large annular shape. Thus, the cylindrical portion 31 formed in this manner extends radially inward from one end, and a donut plate-like inner flange portion 31a having an inner peripheral portion 31a1 into which the cylindrical portion 41a of the valve body 41 can be inserted. have.

この内フランジ部３１ａは、図２及び図３の上部に拡大して示すように、内周部３１ａ１の内縁部に設けられ、第１フランジ部２３の第１環状溝２３ｂとともに、パッキング６が装着可能な円環状の第２環状溝３１ａ２を有している。この第２環状溝３１ａ２は、弁体４１の筒部４１ａの外周部４１ｄに対向する位置に設けられた縦断面部分円形状の装着溝である。 The inner flange portion 31a is provided at the inner edge portion of the inner peripheral portion 31a1 as shown in an enlarged manner in the upper part of FIGS. 2 and 3, and the packing 6 is mounted together with the first annular groove 23b of the first flange portion 23. It has a possible annular second annular groove 31a2. The second annular groove 31a2 is a mounting groove having a circular cross-section, which is provided at a position facing the outer peripheral portion 41d of the cylindrical portion 41a of the valve body 41.

しかして、このような第２環状溝３１ａ２に、パッキング６を装着するにあたっては、第１環状溝２３ｂにパッキング６の一部を装着した状態で、第１フランジ部２３に筒状部３１を連結させる。これにより、第２環状溝３１ａ２にパッキング６の残部が装着され、もって、第１フランジ部２３及び筒状部３１の外縁部をクランプバンド（図示せず）で圧接することにすることにより、第１環状溝２３ｂ及び第２環状溝３１ａ２にパッキング６が挟持されることとなる。しかして、このように第１環状溝２３ｂ及び第２環状溝３１ａ２にパッキング６を装着することによって、溝部２３ａの内周部２３ａ２（第１フランジ部２３の他端部）及び内フランジ部３１ａの内周部３１ａ１（筒状部３１の一端部）と、弁体４１の筒部４１ａと、の間の隙間Ｅを密閉することができる。 Thus, when mounting the packing 6 in such a second annular groove 31a2, the tubular portion 31 is connected to the first flange portion 23 in a state where a part of the packing 6 is mounted in the first annular groove 23b. Let As a result, the remaining part of the packing 6 is attached to the second annular groove 31a2, and by pressing the outer edge parts of the first flange part 23 and the cylindrical part 31 with a clamp band (not shown), The packing 6 is held between the first annular groove 23 b and the second annular groove 31 a 2. Thus, by mounting the packing 6 in the first annular groove 23 b and the second annular groove 31 a 2 in this manner, the inner peripheral portion 23 a 2 (the other end of the first flange portion 23) of the groove 23 a and the inner flange portion 31 a The gap E between the inner circumferential portion 31a1 (one end of the cylindrical portion 31) and the cylindrical portion 41a of the valve body 41 can be sealed.

ところで、この内フランジ部３１ａの内周部３１ａ１は、図２及び図３の上部に拡大して示すように、内形が他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成されている。この内フランジ部３１ａの内周部３１ａ１のテーパ角は、溝部２３ａの内周部２３ａ２及び弁体４１の筒部４１ａの外周部４１ｄのテーパ角と同一であって、内フランジ部３１ａの内周部３１ａ１の内形は、第１環状溝２３ｂ及び第２環状溝３１ａ２を除いて、溝部２３ａの内周部２３ａ２の内形と滑らかに連続するテーパ形状に形成されている。しかして、このように、内フランジ部３１ａの内周部３１ａ１の内形が、他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成され、弁体４１の筒部４１ａの外周部４１ｄの外形が、他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成されているから、内フランジ部３１ａの内周部３１ａ１に対するがたつきを低減することができ、もって、逆止弁としての機能をさらに十分に発揮することができる。また、このように、内フランジ部３１ａの内周部３１ａ１の内形が、他端側（図２及び図３に示す流出側）に向かって拡径するテーパ形状に形成され、弁体４１の筒部４１ａの外周部４１ｄの外形が、他端側（図２及び図３に示す流出側）に向かって拡径する、上記内フランジ部３１ａの内周部３１ａ１のテーパ角と同一のテーパ角であるテーパ形状に形成されていることによって、パッキング６が多少経年劣化してきても、溝部２３ａの内周部２３ａ２（第１フランジ部２３の他端部）及び内フランジ部３１ａの内周部３１ａ１（筒状部３１の一端部）と、弁体４１の筒部４１ａと、の間の隙間Ｅの密閉状態を維持することができる。 By the way, the inner peripheral portion 31a1 of the inner flange portion 31a is expanded toward the other end side (the outflow side shown in FIGS. 2 and 3) as shown in the upper part of FIGS. It is formed in a tapered shape. The taper angle of the inner peripheral portion 31a1 of the inner flange portion 31a is the same as the taper angle of the inner peripheral portion 23a2 of the groove portion 23a and the outer peripheral portion 41d of the cylindrical portion 41a of the valve body 41. The inner shape of the portion 31a1 is formed in a tapered shape that is smoothly continuous with the inner shape of the inner peripheral portion 23a2 of the groove 23a except for the first annular groove 23b and the second annular groove 31a2. Thus, as described above, the inner shape of the inner peripheral portion 31a1 of the inner flange portion 31a is formed in a tapered shape that increases in diameter toward the other end (the outflow side shown in FIGS. 2 and 3) The outer shape of the outer peripheral portion 41d of the cylindrical portion 41a is formed in a tapered shape in which the diameter increases toward the other end side (the outflow side shown in FIGS. 2 and 3), so the inner peripheral portion 31a1 of the inner flange portion 31a It is possible to reduce rattling, and thereby, the function as a check valve can be more fully exhibited. Further, as described above, the inner shape of the inner peripheral portion 31a1 of the inner flange portion 31a is formed in a tapered shape in which the diameter increases toward the other end side (the outflow side shown in FIGS. 2 and 3) The outer diameter of the outer peripheral portion 41d of the cylindrical portion 41a is the same as the taper angle of the inner peripheral portion 31a1 of the inner flange portion 31a where the diameter increases toward the other end (the outflow side shown in FIGS. 2 and 3) Due to the tapered shape, even if the packing 6 has deteriorated a little with time, the inner peripheral portion 23a2 of the groove 23a (the other end of the first flange portion 23) and the inner peripheral portion 31a1 of the inner flange 31a The sealed state of the gap E between (one end of the cylindrical portion 31) and the cylindrical portion 41a of the valve body 41 can be maintained.

他方、第２フランジ部３２は、図２及び図３に示すように、一端部が筒状部３１の他端部に着脱可能に連結され、他端部から径方向内側に延びるドーナツ板状の部材である。この第２フランジ部３２は、一端部の外縁部に筒状部３１の他端部の外縁部を突き合わせた状態で、両外縁部をクランプバンド（図示せず）で圧接することにより、筒状部３１に着脱可能に連結されるようになっている。 On the other hand, as shown in FIGS. 2 and 3, the second flange portion 32 is in the form of a donut plate whose one end is detachably connected to the other end of the cylindrical portion 31 and extends radially inward from the other end. It is a member. The second flange portion 32 has a cylindrical shape by pressure-contacting both outer edge portions with a clamp band (not shown) in a state where the outer edge portion of the other end portion of the cylindrical portion 31 abuts on the outer edge portion of one end portion. The unit 31 is detachably connected.

ところで、この第２フランジ部３２は、図２及び図３に示すように、一端部の中央部に突出して設けられ、外周部にコイルばね５の他端部が装着可能な円環状の突出部３２ａを有している。この突出部３２ａの周縁部（第２フランジ部３２の一端部）は、コイルばね５の他端部が接触配置されるばね受け部として機能している。 By the way, as shown in FIGS. 2 and 3, the second flange portion 32 is provided so as to project at the central portion of one end portion, and is an annular projecting portion to which the other end portion of the coil spring 5 can be attached It has 32a. The peripheral edge portion (one end portion of the second flange portion 32) of the projecting portion 32a functions as a spring receiving portion with which the other end portion of the coil spring 5 is disposed in contact.

より詳しく説明すると、この突出部３２ａは、図３に示す開放状態において、後述する弁部材４の複数の突出部４２の他端部が当接し、弁部材４の他端側への移動を規制する部材として機能している。 More specifically, in the open state shown in FIG. 3, the projection 32a abuts on the other end of a plurality of projections 42 of the valve member 4 described later, and restricts the movement of the valve member 4 to the other end. Function as a member to

また、この突出部３２ａの内径は、径方向に対向する弁部材４の複数の突出部４２の間隔と同一になっている。これにより、弁部材４の複数の突出部４２の他端部を突出部３２ａに確実に当接させることができ、もって、開放状態において、弁部材４の複数の突出部４２が振動することがなくなる。それゆえ、筒状部３１の内部空間Ｃから後述する複数の突出部４２の内部空間Ｆに流体ｆを安定的に流入させることができる。 Further, the inner diameter of the protrusion 32a is equal to the distance between the plurality of protrusions 42 of the valve member 4 facing in the radial direction. As a result, the other ends of the plurality of projections 42 of the valve member 4 can be reliably made to abut on the projections 32 a, whereby the plurality of projections 42 of the valve member 4 vibrate in the open state. It disappears. Therefore, the fluid f can be stably made to flow from the internal space C of the cylindrical portion 31 into the internal spaces F of the plurality of projecting portions 42 described later.

一方、第２接続部３３は、図２及び図３に示すように、一端部が第２フランジ部３２の他端部に一体形成され、他端部に流体ｆが流出する流出口３３ａを有する円筒状の部材である。この第２接続部３３は、外周部の他端部に装着される接続アダプタ（図示せず）を介して、流出口３３ａに連通可能に流出管（図示せず）を接続する円筒状の接続管である。なお、この第２接続部３３は、両端部が開口するとともに、内周部に流体ｆが流通可能な内部空間Ｄを有している。この内部空間Ｄは、図３に示すように、第２接続部３３の一端部の開口部を介して、複数の突出部４２の内部空間Ｆと連通している。また、第２接続部３３の内径は、第１接続部２１及び弁座２２の内径と同一であって、第１接続部２１及び第２接続部３３には、夫々同一の内径となる流入管及び流出管（何れも図示せず）を接続することができるようになっている。 On the other hand, as shown in FIGS. 2 and 3, the second connection portion 33 has one end formed integrally with the other end of the second flange portion 32, and the other end has an outlet 33a from which the fluid f flows out. It is a cylindrical member. The second connection portion 33 is a cylindrical connection that connects an outlet pipe (not shown) to be able to communicate with the outlet 33a via a connection adapter (not shown) attached to the other end of the outer peripheral portion. It is a tube. The second connection portion 33 is open at both ends and has an inner space D in which the fluid f can flow in the inner peripheral portion. As shown in FIG. 3, the internal space D communicates with the internal spaces F of the plurality of projecting portions 42 via the opening at one end of the second connection portion 33. In addition, the inner diameter of the second connection portion 33 is the same as the inner diameter of the first connection portion 21 and the valve seat 22, and the inflow pipe having the same inner diameter as the first connection portion 21 and the second connection portion 33 respectively. And an outlet pipe (both not shown) can be connected.

＜弁部材の説明＞
弁部材４は、図１〜図３に示すように、弁座２２の外周部２２ａに進退自在かつ抜脱不能に装着される有底筒状の弁体４１と、弁体４１の他端部に突出して複数本（例えば、６本）設けられ、夫々の間に流体ｆが流通可能な第２連通孔４２ａ（隣り合う部材の間の隙間）を有する複数の突出部４２と、を備えている。なお、この弁部材４は、例えば、耐食性に優れたステンレス鋼（ＳＵＳ３１６）等の合金を切削加工することによって、弁体４１及び複数の突出部４２を一体形成したものである。 <Description of valve member>
As shown in FIGS. 1 to 3, the valve member 4 has a bottomed cylindrical valve body 41 attached to the outer peripheral portion 22 a of the valve seat 22 so as to be able to move forward and backward and can not be removed. And a plurality of (for example, six) projecting portions, each having a plurality of projecting portions 42 having second communication holes 42a (gaps between adjacent members) through which fluid f can flow. There is. In addition, this valve member 4 integrally forms the valve body 41 and the some protrusion part 42 by cutting an alloy, such as stainless steel (SUS316) which was excellent in corrosion resistance, for example.

ところで、この弁体４１は、図１〜図３に示すように、弁座２２の外周部２２ａに進退自在かつ抜脱不能に装着される一端側が開口する有底筒状の部材であって、他端部がコイルばね５の一端部が接触配置されるばね受け部として機能している。 By the way, as shown in FIGS. 1 to 3, the valve body 41 is a bottomed cylindrical member having one end open that is mounted on the outer peripheral portion 22 a of the valve seat 22 so as to be movable back and forth and can not be removed. The other end portion functions as a spring receiving portion in which one end portion of the coil spring 5 is disposed in contact.

しかして、このような弁体４１は、図１〜図３に示すように、一端部に設けられ第１連通孔２２ｂを開閉可能に弁座２２の外周部２２ａを僅かな隙間をあけて覆う円筒状の筒部４１ａと、筒部４１ａの他端部に一体形成され弁座２２の開口部２２ｃを僅かな隙間をあけて覆う円板状の底部４１ｂと、を有している。しかるに、図２の上部に拡大して示すように、閉塞状態において、筒部４１ａの一端部は、第１フランジ部２３の溝部２３ａに挿入されたとき、溝部２３ａの外周部２３ａ１に接触し、溝部２３ａの内周部２３ａ２及び溝部２３ａの底部２３ａ３（溝部２３ａの外周部２３ａ１と溝部２３ａの内周部２３ａ２と接続する他端側部）に僅かな隙間をあけて接触しないようになっている。これにより、弁体４１の筒部４１ａの一端部が、溝部２３ａの内周部２３ａ２及び溝部２３ａの底部２３ａ３に僅かな隙間をあけて接触しないから、筒部４１ａが溝部２３ａの内周部２３ａ２及び溝部２３ａの底部２３ａ３を押圧することがなくなり、もって、筒部４１ａ及び第１フランジ部２３の溝部２３ａの変形を低減することができる。またさらに、弁体４１の筒部４１ａが、弁座２２の外周部２２ａを僅かな隙間をあけて覆うとともに、弁体４１の底部４１ｂが、弁座２２の開口部２２ｃを僅かな隙間をあけて覆うから、弁体４１が弁座２２に接触する接触抵抗がなくなり、弁体４１の移動がスムーズになるとともに、弁体４１及び弁座２２の摩耗を低減することができる。 Thus, as shown in FIGS. 1 to 3, such a valve body 41 is provided at one end and covers the outer peripheral portion 22a of the valve seat 22 with a slight gap so as to be able to open and close the first communication hole 22b. It has a cylindrical cylindrical portion 41a, and a disk-like bottom portion 41b integrally formed at the other end of the cylindrical portion 41a and covering the opening 22c of the valve seat 22 with a slight gap. However, as shown enlarged in the upper part of FIG. 2, in the closed state, one end of the cylindrical portion 41 a contacts the outer peripheral portion 23 a 1 of the groove 23 a when inserted into the groove 23 a of the first flange 23. There is a slight gap between the inner circumferential portion 23a2 of the groove portion 23a and the bottom 23a3 of the groove portion 23a (the other side portion connecting the outer circumferential portion 23a1 of the groove portion 23a and the inner circumferential portion 23a2 of the groove portion 23a) so as not to contact . As a result, one end of the cylindrical portion 41a of the valve body 41 does not contact the inner peripheral portion 23a2 of the groove 23a and the bottom 23a3 of the groove 23a with a slight gap, so the cylindrical portion 41a is the inner peripheral portion 23a2 of the groove 23a And since it does not press the bottom part 23a3 of the groove part 23a, a deformation | transformation of the groove part 23a of the cylinder part 41a and the 1st flange part 23 can be reduced. Furthermore, while the cylindrical portion 41a of the valve body 41 covers the outer peripheral portion 22a of the valve seat 22 with a slight gap, the bottom 41b of the valve body 41 opens a slight gap with the opening 22c of the valve seat 22. Since the valve body 41 is in contact with the valve seat 22 without contact, the movement of the valve body 41 becomes smooth, and wear of the valve body 41 and the valve seat 22 can be reduced.

一方、複数の突出部４２は、図１〜図３（特に、図１参照）に示すように、弁体４１の他端部に突出して複数本（例えば、６本）設けられ、夫々の間に流体ｆが流通可能な第２連通孔４２ａ（隣り合う突出部４２の間の隙間）を有する部材である。この複数の突出部４２は、図１に示すように、弁体４１の他端部の外縁部から他端側にまっすぐ延びる柱状部材であって、夫々周方向に間隔をあけて等配されている。この複数の突出部４２の内周部には、図３に示すように、第２連通孔４２ａから流入した流体ｆが流入可能な複数の突出部４２の内部空間Ｆが設けられており、複数の突出部４２の内部空間Ｆに流通した流体ｆは、他端側に連通する第２接続部３３の内部空間Ｄに流出することとなる。 On the other hand, as shown in FIGS. 1 to 3 (in particular, refer to FIG. 1), a plurality of (for example, six) protruding portions 42 are provided so as to protrude from the other end of the valve body 41. The second communication hole 42a (a gap between the adjacent projections 42) through which the fluid f can flow. The plurality of protrusions 42 are columnar members extending straight from the outer edge of the other end of the valve body 41 to the other end as shown in FIG. 1 and are equally spaced apart in the circumferential direction. There is. As shown in FIG. 3, internal spaces F of a plurality of protrusions 42 into which the fluid f flowing in from the second communication hole 42a can flow are provided on the inner peripheral portions of the plurality of protrusions 42, The fluid f circulated in the internal space F of the projecting portion 42 flows out to the internal space D of the second connection portion 33 communicated with the other end side.

＜コイルばねの説明＞
コイルばね５は、例えば、耐食性に優れたステンレス鋼（ＳＵＳ３１６）等の合金を棒状に形成したものを巻回することによって、付勢力を付与したものであって、図１〜図３に示すように、一端部が複数の突出部４２の周囲に隙間をあけて装着され、弁体４１の他端部に接触配置されるとともに、他端部が突出部３２ａの周縁部（第２フランジ部３２の一端部）に圧縮状態で接触配置され、弁体４１を第１フランジ部２３の他端部に向けて付勢する付勢部材である。なお、本実施形態においては、コイルばね５の一端部が複数の突出部４２の周囲に隙間をあけて装着させる例を示したが、密着させて装着しても良い。しかしながら、隙間をあけて装着させた方が好ましい。隙間をあけて装着させることによって、複数の突出部４２とコイルばね５との間に付着している流体ｆを洗浄し易くなり、もって、異物の発生を生じ難くすることができるためである。 <Description of coil spring>
The coil spring 5 is provided with a biasing force by, for example, winding an alloy formed of a stainless steel (SUS 316) or the like excellent in corrosion resistance into a rod shape, as shown in FIGS. 1 to 3. The first end of the valve body 41 is mounted on the other end of the valve body 41 in contact with the other end of the valve body 41, and the other end is the peripheral portion of the projection 32a (the second flange 32). The biasing member is disposed in contact with the one end portion of the first flange portion 23 in a compressed state, and biases the valve body 41 toward the other end portion of the first flange portion 23. In the present embodiment, an example is shown in which one end of the coil spring 5 is attached around the plurality of projecting parts 42 with a gap, but may be attached closely. However, it is preferable to open with a gap. By opening the gap and attaching it, the fluid f adhering between the plurality of projections 42 and the coil spring 5 can be easily cleaned, and generation of foreign matter can be suppressed.

＜パッキングの説明＞
パッキング６は、例えば、エチレンプロピレンジエンゴム（ＥＰＤＭ）等のゴム弾性を有するエラストマーにより形成されたＯリングであって、図１〜図３に示すように、溝部２３ａの内周部２３ａ２（第１フランジ部２３の他端部）及び内フランジ部３１ａの内周部３１ａ１（筒状部３１の一端部）と、弁体４１の筒部４１ａと、の間の隙間Ｅを密閉可能に介装されるシール部材である。このパッキング６は、図２の上部に拡大して示すように、閉塞状態において、筒部４１ａの一端部が、第１フランジ部２３の溝部２３ａに挿入されたとき、筒部４１ａの外周部４１ｄに接触することによって、溝部２３ａの内周部２３ａ２及び内フランジ部３１ａの内周部３１ａ１と、弁体４１の筒部４１ａと、の間の隙間Ｅを密閉するものである。 <Description of packing>
The packing 6 is, for example, an O-ring formed of an elastomer having rubber elasticity such as ethylene propylene diene rubber (EPDM), and as shown in FIGS. 1 to 3, the inner circumferential portion 23a2 of the groove 23a (first The clearance E between the other end of the flange portion 23 and the inner peripheral portion 31a1 (one end of the cylindrical portion 31) of the inner flange portion 31a and the cylindrical portion 41a of the valve body 41 is sealingly interposed. Seal member. As shown in an enlarged manner in the upper part of FIG. 2, when the one end of the cylindrical portion 41 a is inserted into the groove 23 a of the first flange portion 23 in the closed state, the packing 6 is an outer peripheral portion 41 d of the cylindrical portion 41 a. The gap E between the inner circumferential portion 23a2 of the groove portion 23a and the inner circumferential portion 31a1 of the inner flange portion 31a and the cylindrical portion 41a of the valve body 41 is sealed.

＜ロッドレス逆止弁の動作の説明＞
かくして、上記のように構成されるロッドレス逆止弁１は、以下のように動作する。 <Description of operation of rodless check valve>
Thus, the rodless check valve 1 configured as described above operates as follows.

すなわち、図２に示すように、閉塞姿勢において、第１接続部２１の内部空間Ａ及び弁座２２の内部空間Ｂに流通する流体ｆの圧力が、筒状部３１の内部空間Ｃ、複数の突出部４２の内部空間Ｆ及び第２接続部３３の内部空間Ｄを流通する流体ｆの圧力よりも低いとき、コイルばね５によって付勢された弁体４１の筒部４１ａが、第１フランジ部２３の他端部に近接する方向に移動する。これにより、弁座２２の第１連通孔２２ｂを閉塞するとともに、筒部４１ａの一端部が、第１フランジ部２３の溝部２３ａに挿入され、パッキング６が、筒部４１ａの外周部４１ｄに接触することによって、溝部２３ａの内周部２３ａ２及び内フランジ部３１ａの内周部３１ａ１と、弁体４１の筒部４１ａと、の間の隙間Ｅを密閉することとなる。しかるに、第１接続部２１の内部空間Ａ及び弁座２２の内部空間Ｂに流通する流体ｆは、筒状部３１の内部空間Ｃ、複数の突出部４２の内部空間Ｆ及び第２接続部３３の内部空間Ｄへの流入が制限されることとなる。 That is, as shown in FIG. 2, in the closed posture, the pressure of the fluid f flowing to the internal space A of the first connection portion 21 and the internal space B of the valve seat 22 When the pressure of the fluid f flowing in the internal space F of the projecting portion 42 and the internal space D of the second connection portion 33 is lower, the cylindrical portion 41 a of the valve body 41 biased by the coil spring 5 is the first flange portion Move in the direction close to the other end of 23. As a result, the first communication hole 22b of the valve seat 22 is closed, and one end of the cylindrical portion 41a is inserted into the groove 23a of the first flange portion 23, and the packing 6 contacts the outer peripheral portion 41d of the cylindrical portion 41a. By doing this, the gap E between the inner peripheral portion 23a2 of the groove 23a and the inner peripheral portion 31a1 of the inner flange portion 31a and the cylindrical portion 41a of the valve body 41 is sealed. However, the fluid f flowing in the internal space A of the first connection portion 21 and the internal space B of the valve seat 22 is the internal space C of the cylindrical portion 31 and the internal spaces F of the plurality of projecting portions 42 and the second connection portion 33. The inflow to the internal space D of is limited.

ところで、本実施形態においては、流入管（図示せず）から流入する流体ｆは、第１接続部２１の流入口２１ａから第１接続部２１の内部空間Ａに流通し、弁座２２の内部空間Ｂに流通することとなるが、弁体４１の筒部４１ａが弁座２２の第１連通孔２２ｂを閉塞しているから、弁座２２の内部空間Ｂに流通する流体ｆが、筒状部３１の内部空間Ｃに流入することはない。仮に、弁座２２の内部空間Ｂに流通する流体ｆが、第１連通孔２２ｂ及び弁座２２の開口部２２ｃを介して溝部２３ａの内周部２３ａ２及び内フランジ部３１ａの内周部３１ａ１と、弁体４１の筒部４１ａと、の間の隙間Ｅに流入した場合であっても、パッキング６が、筒部４１ａの外周部４１ｄに接触することによって、溝部２３ａの内周部２３ａ２及び内フランジ部３１ａの内周部３１ａ１と、弁体４１の筒部４１ａと、の間の隙間Ｅが密閉されているから、筒状部３１の内部空間Ｃに流入することはない。 By the way, in the present embodiment, the fluid f flowing from the inflow pipe (not shown) flows from the inflow port 21a of the first connection portion 21 to the internal space A of the first connection portion 21 and the inside of the valve seat 22 Since the cylinder portion 41a of the valve body 41 closes the first communication hole 22b of the valve seat 22, the fluid f flowing in the internal space B of the valve seat 22 has a cylindrical shape. It does not flow into the internal space C of the part 31. Temporarily, the fluid f circulating in the internal space B of the valve seat 22 passes through the first communication hole 22b and the opening 22c of the valve seat 22, and the inner circumferential portion 23a2 of the groove 23a and the inner circumferential portion 31a1 of the inner flange portion 31a. Even when it flows into the gap E between the cylindrical portion 41a of the valve body 41, the packing 6 contacts the outer peripheral portion 41d of the cylindrical portion 41a, whereby the inner peripheral portion 23a2 of the groove 23a and the inside Since the gap E between the inner peripheral portion 31 a 1 of the flange portion 31 a and the cylindrical portion 41 a of the valve body 41 is sealed, it does not flow into the internal space C of the cylindrical portion 31.

一方、図３に示すように、開放姿勢において、第１接続部２１の内部空間Ａ及び弁座２２の内部空間Ｂに流通する流体ｆの圧力が、筒状部３１の内部空間Ｃ、複数の突出部４２の内部空間Ｆ及び第２接続部３３の内部空間Ｄを流通する流体ｆの圧力よりも高いとき、弁体４１の筒部４１ａが、コイルばね５の付勢力に抗して第１フランジ部２３の他端部から離接する方向に移動することとなる。これにより、弁座２２の第１連通孔２２ｂが開放され、筒部４１ａの一端部が、第１フランジ部２３の溝部２３ａから離脱し、パッキング６が、筒部４１ａの外周部４１ｄに接触しなくなり、溝部２３ａの内周部２３ａ２及び内フランジ部３１ａの内周部３１ａ１と、弁体４１の筒部４１ａと、の間の隙間Ｅが開通することとなる。しかして、第１接続部２１の内部空間Ａ及び弁座２２の内部空間Ｂに流通する流体ｆは、筒状部３１の内部空間Ｃ、複数の突出部４２の内部空間Ｆ及び第２接続部３３の内部空間Ｄへの流入が許容されることとなる。 On the other hand, as shown in FIG. 3, in the open posture, the pressure of the fluid f flowing in the internal space A of the first connection portion 21 and the internal space B of the valve seat 22 When the pressure of the fluid f flowing in the internal space F of the projecting portion 42 and the internal space D of the second connection portion 33 is higher, the cylindrical portion 41 a of the valve body 41 resists the biasing force of the coil spring 5. It moves in the direction away from the other end of the flange portion 23. Thereby, the first communication hole 22b of the valve seat 22 is opened, one end of the cylindrical portion 41a is separated from the groove 23a of the first flange portion 23, and the packing 6 contacts the outer peripheral portion 41d of the cylindrical portion 41a. As a result, the gap E between the inner peripheral portion 23a2 of the groove 23a and the inner peripheral portion 31a1 of the inner flange portion 31a and the cylindrical portion 41a of the valve body 41 is opened. Thus, the fluid f circulating in the internal space A of the first connection portion 21 and the internal space B of the valve seat 22 is the internal space C of the cylindrical portion 31, the internal space F of the plurality of projecting portions 42, and the second connection portion The inflow to the internal space D of 33 will be permitted.

しかるに、流入管（図示せず）から流入する流体ｆは、第１接続部２１の流入口２１ａから第１接続部２１の内部空間Ａに流通し、弁座２２の内部空間Ｂに流通する。次いで、弁座２２の内部空間Ｂに流通する流体ｆは、第１連通孔２２ｂを介して溝部２３ａの内周部２３ａ２及び内フランジ部３１ａの内周部３１ａ１と、弁体４１の筒部４１ａと、の間の隙間Ｅに流入し、筒状部３１の内部空間Ｃに流入する。次いで、筒状部３１の内部空間Ｃに流入する流体ｆは、複数の突出部４２の第２連通孔４２ａ及び弁座２２の開口部２２ｃを介して複数の突出部４２の内部空間Ｆに流入し、第２接続部３３の内部空間Ｄに流入する。そして、第２接続部３３の内部空間Ｄに流入する流体ｆは、第２接続部３３の流出口３３ａから流出管（図示せず）に流出することとなる。 However, the fluid f flowing in from the inflow pipe (not shown) flows from the inflow port 21 a of the first connection portion 21 to the internal space A of the first connection portion 21 and flows to the internal space B of the valve seat 22. Next, the fluid f circulating in the internal space B of the valve seat 22 is the inner peripheral portion 23a2 of the groove portion 23a and the inner peripheral portion 31a1 of the inner flange portion 31a via the first communication hole 22b, and the cylindrical portion 41a of the valve body 41 , And flows into the internal space C of the cylindrical portion 31. Then, the fluid f flowing into the internal space C of the cylindrical portion 31 flows into the internal space F of the plurality of protrusions 42 via the second communication holes 42 a of the plurality of protrusions 42 and the openings 22 c of the valve seat 22. Flows into the internal space D of the second connection portion 33. Then, the fluid f flowing into the internal space D of the second connection portion 33 flows out from the outlet 33 a of the second connection portion 33 to an outflow pipe (not shown).

かくして、このようにして、ロッドレス逆止弁１は、流体ｆの流入圧力に応じて、流体ｆの流入を制限する閉塞姿勢（図２参照）と、流体ｆの流入を許容する開放姿勢（図３参照）と、を切り替えることができることとなる。 Thus, in this manner, the rodless check valve 1 has a closed attitude (see FIG. 2) that restricts the inflow of the fluid f and an open attitude that allows the inflow of the fluid f in accordance with the inflow pressure of the fluid f. 3) and can be switched.

しかして、以上説明した本実施形態によれば、弁体４１の筒部４１ａが、弁座２２の外周部２２ａに進退自在かつ抜脱不能に装着され、外周部２２ａに流体ｆが流通可能な第１連通孔２２ｂを開閉可能に弁座２２の外周部２２ａを覆うようになっている。これにより、従来のように弁棒（ロッド）及びばね受け部の支持孔を設ける必要がなくなるから、閉塞姿勢において、弁体４１が弁座２２を完全に閉塞することができ、もって、逆止弁としての機能を十分に発揮することができることとなる。 Thus, according to the present embodiment described above, the cylindrical portion 41a of the valve body 41 is attached to the outer peripheral portion 22a of the valve seat 22 so as to be able to move forward and backward and can not be removed, and the fluid f can flow The outer peripheral portion 22a of the valve seat 22 is covered so as to be able to open and close the first communication hole 22b. As a result, it is not necessary to provide support holes for the valve rod (rod) and the spring receiving portion as in the prior art, so that the valve body 41 can completely close the valve seat 22 in the closed position. It will be possible to fully exhibit the function as a valve.

なお、本実施形態において示した形状等はあくまで一例であり、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。例えば、本実施形態においては、第１本体部２は、第１接続部２１、弁座２２、第１フランジ部２３を一体形成したものであったが、別体で形成してもよい。また、第１本体部２は、第１フランジ部２３の外周部から他端側に円筒状に延びる筒状部を有する構成であってもよい。 In addition, the shape etc. which were shown in this embodiment are an example to the last, and a various deformation | transformation and change are possible within the range of the summary of this invention described in the claim. For example, in the present embodiment, the first body portion 2 integrally forms the first connection portion 21, the valve seat 22, and the first flange portion 23, but may be separately formed. Further, the first main body portion 2 may be configured to have a cylindrical portion cylindrically extending from the outer peripheral portion of the first flange portion 23 to the other end side.

一方、本実施形態においては、第２本体部３は、筒状部３１からなる１部材と、第２フランジ部３２と第２接続部３３とからなる１部材と、の２部材で構成されていたが、これらを一体で形成してもよい。 On the other hand, in the present embodiment, the second main body portion 3 is configured by two members of one member consisting of the cylindrical portion 31 and one member consisting of the second flange portion 32 and the second connection portion 33. However, they may be integrally formed.

また、本実施形態においては、第１フランジ部２３の他端部の外縁部に、筒状部３１の一端部の外縁部を突き合わせた状態で、両外縁部をクランプバンド（図示せず）で圧接することにより、筒状部３１が第１フランジ部２３に着脱可能に連結されるようになっている例を示したが、それに限らず、一体的に形成しても良い。 Further, in the present embodiment, with the outer edge of the one end of the cylindrical portion 31 butted against the outer edge of the other end of the first flange portion 23, both outer edges are clamp bands (not shown). Although the cylindrical portion 31 is detachably connected to the first flange portion 23 by pressure contact, the present invention is not limited thereto, and the cylindrical portion 31 may be integrally formed.

さらに、本実施形態においては、第２フランジ部３２の一端部の外縁部に筒状部３１の他端部の外縁部を突き合わせた状態で、両外縁部をクランプバンド（図示せず）で圧接することにより、第２フランジ部３２が筒状部３１に着脱可能に連結されるようになっている例を示したが、それに限らず、一体的に形成しても良い。 Furthermore, in the present embodiment, in a state where the outer edge of the other end of the cylindrical portion 31 is in contact with the outer edge of the one end of the second flange 32, the outer edges are crimped with a clamp band (not shown) By doing this, the example in which the second flange portion 32 is detachably connected to the cylindrical portion 31 is shown, but the invention is not limited thereto, and may be integrally formed.

一方、本実施形態においては、パッキング６が、第１フランジ部２３の他端部及び筒状部３１の一端部と、弁体４１の筒部４１ａと、の間の隙間Ｅを密閉可能に介装されている例を示したが、これに限らず、第１フランジ部２３の他端部に形成された溝部２３ａと、弁体４１の筒部４１ａと、の間の隙間のみを密閉可能に介装されるものや、筒状部３１の一端部から径方向内側に延びる内フランジ部３１ａの内周部３１ａ１と弁体４１の筒部４１ａと、の間の隙間のみを密閉可能に介装されるものであってもよい。 On the other hand, in the present embodiment, the packing 6 is capable of sealing the gap E between the other end of the first flange portion 23 and the one end of the cylindrical portion 31 and the cylindrical portion 41 a of the valve body 41. Although an example of mounting is shown, the present invention is not limited to this, and only the gap between the groove 23a formed at the other end of the first flange 23 and the cylinder 41a of the valve body 41 can be sealed. Or the gap between the inner peripheral portion 31a1 of the inner flange portion 31a extending radially inward from one end of the cylindrical portion 31 and the cylindrical portion 41a of the valve body 41 so as to be sealed. It may be

１ロッドレス逆止弁
２第１本体部
３第２本体部
４弁部材
５コイルばね（付勢部材）
６パッキング（シール部材）
２１第１接続部
２１ａ流入口
２１ｂ外周部
２２弁座
２２ａ外周部
２２ｂ第１連通孔
２２ｃ開口部
２３第１フランジ部
２３ａ溝部
２３ａ１外周部
２３ａ２内周部
２３ａ３底部
２３ｂ第１環状溝
３１筒状部
３１ａ内フランジ部
３１ａ１内周部
３１ａ２第２環状溝
３２第２フランジ部
３２ａ突出部
３３第２接続部
３３ａ流出口
４１弁体
４１ａ筒部
４１ｂ底部
４１ｃ内周部
４１ｄ外周部
４２複数の突出部
４２ａ第２連通孔
ｆ流体
Ａ第１接続部の内部空間
Ｂ弁座の内部空間
Ｃ筒状部の内部空間
Ｄ第２接続部の内部空間
Ｅ隙間
Ｆ複数の突出部の内部空間

1 rodless check valve 2 first main body 3 second main body 4 valve member 5 coil spring (biasing member)
6 Packing (seal member)
21 first connection portion 21a inflow port 21b outer peripheral portion 22 valve seat 22a outer peripheral portion 22b first communication hole 22c opening 23 first flange portion 23a groove portion 23a1 outer peripheral portion 23a2 inner peripheral portion 23a3 bottom portion 23b first annular groove 31 cylindrical portion 31a inner flange portion 31a1 inner circumferential portion 31a2 second annular groove 32 second flange portion 32a projecting portion 33 second connecting portion 33a outlet port 41 valve body 41a cylindrical portion 41b bottom portion 41c inner circumferential portion 41d outer circumferential portion 42 plural projecting portions 42a Second communication hole f Fluid A Internal space of first connecting portion B Internal space of valve seat C Internal space of cylindrical portion D Internal space of second connecting portion E Gap F Internal space of multiple protrusions

Claims

A first body disposed on the inflow side of the fluid;
A second main body disposed on the outflow side of the fluid;
A valve member provided inside the second main body;
A biasing member for biasing the valve member;
And a sealing member,
The first body portion is
A cylindrical valve seat having a first communication hole provided in an outer peripheral portion, through which the fluid can flow, and an opening opened at the other end on the outflow side;
And a first flange portion provided on the valve seat,
The second body portion is
One end portion on the inflow side is provided at the other end portion on the outflow side of the first flange portion, the valve seat is disposed on an inner peripheral portion, and the fluid flows through the first communication hole. A tubular part having a possible internal space,
And a second flange portion provided at the other end of the outflow side of the cylindrical portion,
The valve member is
A cylindrical portion is attached to an outer peripheral portion of the valve seat so as to be able to move forward and backward and can not be removed, and covers the outer peripheral portion of the valve seat so as to open and close the first communication hole; A valve body having a bottom portion provided and covering an opening of the valve seat;
And a plurality of projecting portions provided in a projecting manner at the other end on the outflow side of the valve body, and having a second communication hole through which the fluid can flow between them.
The biasing member is
One end on the inflow side is mounted around the plurality of protrusions, and is disposed in contact with the other end on the outflow side of the valve body, and the other end on the outflow side is the second flange portion One end of the inflow side is disposed in contact in a compressed state, and the valve body is biased toward the other end of the first flange portion on the outflow side,
The seal member is
The gap between the other end on the outflow side of the first flange portion and / or the one end on the inflow side of the cylindrical portion and the cylindrical portion of the valve body is sealingly interposed .
The outer peripheral portion of the valve seat is formed in a tapered shape whose outer diameter decreases toward the outflow side,
The rodless check valve in which the inner peripheral part of the said cylinder part of the said valve body is formed in the taper shape which an internal shape diameter- reduces toward the said outflow side .

A first body disposed on the inflow side of the fluid;
A second main body disposed on the outflow side of the fluid;
A valve member provided inside the second main body;
A biasing member for biasing the valve member;
And a sealing member,
The first body portion is
A cylindrical valve seat having a first communication hole provided in an outer peripheral portion, through which the fluid can flow, and an opening opened at the other end on the outflow side;
And a first flange portion provided on the valve seat,
The second body portion is
One end portion on the inflow side is provided at the other end portion on the outflow side of the first flange portion, the valve seat is disposed on an inner peripheral portion, and the fluid flows through the first communication hole. A tubular part having a possible internal space,
And a second flange portion provided at the other end of the outflow side of the cylindrical portion,
The valve member is
A cylindrical portion is attached to an outer peripheral portion of the valve seat so as to be able to move forward and backward and can not be removed, and covers the outer peripheral portion of the valve seat so as to open and close the first communication hole; A valve body having a bottom portion provided and covering an opening of the valve seat;
And a plurality of projecting portions provided in a projecting manner at the other end on the outflow side of the valve body, and having a second communication hole through which the fluid can flow between them.
The biasing member is
One end on the inflow side is mounted around the plurality of protrusions, and is disposed in contact with the other end on the outflow side of the valve body, and the other end on the outflow side is the second flange portion One end of the inflow side is disposed in contact in a compressed state, and the valve body is biased toward the other end of the first flange portion on the outflow side,
The seal member is
The gap between the other end on the outflow side of the first flange portion and / or the one end on the inflow side of the cylindrical portion and the cylindrical portion of the valve body is sealingly interposed.
The first flange portion has a groove portion into which the cylindrical portion of the valve body can be inserted.
The inner circumferential portion of the groove portion is formed in a tapered shape in which an inner shape expands toward the outflow side,
The rodless check valve in which the outer peripheral part of the said cylinder part of the said valve body is formed in the taper shape which an external shape expands toward the said outflow side .