JP4486826B2 - Check valve manufacturing method - Google Patents

Check valve manufacturing method Download PDF

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JP4486826B2
JP4486826B2 JP2004023621A JP2004023621A JP4486826B2 JP 4486826 B2 JP4486826 B2 JP 4486826B2 JP 2004023621 A JP2004023621 A JP 2004023621A JP 2004023621 A JP2004023621 A JP 2004023621A JP 4486826 B2 JP4486826 B2 JP 4486826B2
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seat member
valve seat
check valve
tubular body
valve
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茂 久保田
幹郎 松島
志信 河村
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Saginomiya Seisakusho Inc
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Description

この発明は、逆止弁の製造方法に関し、特に、管体内蔵型の逆止弁の製造方法に関するものである。 This invention relates to a method of manufacturing a check valve, in particular, to a method for manufacturing a tube with built-in check valve.

各種の流体回路に用いられる逆止弁として、管継手を兼ねた管体内に弁座部材と弁体とを含む逆止弁組立体が挿入固定された管体内蔵型の逆止弁が知られている。   As a check valve used in various fluid circuits, a check valve with a built-in tube body in which a check valve assembly including a valve seat member and a valve body is inserted and fixed in a pipe body that also serves as a pipe joint is known. ing.

管体内蔵型の逆止弁における逆止弁組立体の管体に対する固定が、管体外周のかしめによって行われた構造のものがある（特許文献１）。   There is a structure in which the check valve assembly is fixed to the pipe body in the pipe built-in type check valve by caulking the outer periphery of the pipe body (Patent Document 1).

かしめ結合は、管体が銅管等、銅系金属で構成されているものであれば、問題がないが、耐食性を得るために、管体がステンレス鋼で構成されていると、硬度等の問題によって良好なかしめ結合を行うことが難しくなる。   Caulking is not a problem if the tube is made of a copper-based metal such as a copper tube, but in order to obtain corrosion resistance, if the tube is made of stainless steel, the hardness etc. The problem makes it difficult to achieve good caulking.

このため、ステンレス鋼製の管体による逆止弁では、弁座部材の外周にリング状の中間フランジ部を設け、この中間フランジ部を両側から２個の管体によって挟み、中間フランジ部と２個の管体の３者をＴＩＧ溶接することが提案されている（例えば、特許文献２）。   For this reason, in a check valve using a stainless steel tube, a ring-shaped intermediate flange is provided on the outer periphery of the valve seat member, and this intermediate flange is sandwiched between two tubes from both sides. It has been proposed to TIG weld three of the individual pipe bodies (for example, Patent Document 2).

しかし、中間フランジ部を２個の管体によって挟んで３者をＴＩＧ溶接するものは、管体の部品点数が増え、しかも、溶接不良やピンホール等により外部リークの虞れがあり、生産上の歩留まりが悪い。
特開平７−１７４２４９号公報 特開２００２−１４７６８１号公報 However, when the intermediate flange is sandwiched between two pipes and the three members are TIG welded, the number of parts of the pipes increases, and there is a risk of external leakage due to poor welding or pinholes. Yield is bad.
JP 7-174249 A Japanese Patent Laid-Open No. 2002-147681

この発明が解決しようとする課題は、溶接構造の管体内蔵型の逆止弁で、部品点数の増加、流体の管体外部へのリークを生じることがなく、優れた信頼性を得ると共に、製造上の不良品の発生を低減することである。   The problem to be solved by the present invention is a check valve with a built-in tubular body with a welded structure, without increasing the number of parts, causing leakage of fluid to the outside of the tubular body, obtaining excellent reliability, This is to reduce the production of defective products.

この発明による逆止弁の製造方法は、管体内に、弁座部材と弁体とを含む逆止弁組立体を挿入して前記弁座部材を前記管体に嵌合させ、前記弁座部材が前記管体に嵌合された状態で、回転する円板溶接電極を前記管体の外周面に押し付けて前記円板溶接電極と前記管体とを相対的に前記管体の外周面周りに回転させて前記弁座部材の外周面と前記管体の内周面との間を前記管体の外周面側から全周シーム溶接することにより、前記弁座部材を前記管体に固定し、全周シーム溶接の間中、溶接用電極を兼ねた位置決め部材を前記弁座部材に当接させて前記逆止弁組立体の前記管体内における軸線方向の位置決めを行うことを特徴とする。 In the check valve manufacturing method according to the present invention, a check valve assembly including a valve seat member and a valve body is inserted into a pipe body, the valve seat member is fitted to the pipe body, and the valve seat member is inserted. In a state in which the disc welding electrode is fitted to the tubular body, the rotating disc welding electrode is pressed against the outer circumferential surface of the tubular body, and the disc welding electrode and the tubular body are relatively moved around the outer circumferential surface of the tubular body. Rotating and fixing the valve seat member to the pipe body by welding the entire circumference from the outer peripheral surface side of the pipe body between the outer peripheral face of the valve seat member and the inner peripheral face of the pipe body , During the entire circumference seam welding, a positioning member that also serves as a welding electrode is brought into contact with the valve seat member to position the check valve assembly in the axial direction in the tubular body .

この発明によれば、管体内に挿入されて嵌合された逆止弁組立体の弁座部材が、その外周面と管体の内周面との間の、管体の外周面側からの全周シーム溶接により管体に固定され、全周シーム溶接の間中、溶接用電極を兼ねた位置決め部材を弁座部材に当接させて逆止弁組立体の管体内における軸線方向の位置決めが行われているから、流体の管体外部へのリークや、管体と弁座部材との隙間からの流体漏れの虞れがなく、製造上の不良品発生の低減を実現でき、管体も一つで済み、部品点数が増えることがない。 According to the present invention, the valve seat member of the check valve assembly inserted and fitted into the tubular body is between the outer circumferential surface and the inner circumferential surface of the tubular body from the outer circumferential surface side of the tubular body. It is fixed to the pipe body by all-around seam welding, and during the all-around seam welding, a positioning member that also serves as a welding electrode is brought into contact with the valve seat member to position the check valve assembly in the axial direction in the pipe body. Since there is no risk of fluid leaking to the outside of the pipe body or fluid leakage from the gap between the pipe body and the valve seat member, the production of defective products can be reduced, and the pipe body is also One is enough and the number of parts does not increase.

この発明による製造方法により製造される逆止弁の一つの形態を、図１を参照して説明する。 One form state of the check valve manufactured by the manufacturing method according to the present invention will be described with reference to FIG.

逆止弁１０は、管継手を兼ねたストレート管による管体１１を有し、管体１１内の軸線方向中間部に逆止弁組立体１２が配置されている。   The check valve 10 includes a tubular body 11 that is a straight pipe that also serves as a pipe joint, and a check valve assembly 12 is disposed in an intermediate portion in the axial direction in the tubular body 11.

逆止弁組立体１２は、弁ポート１３を有する弁座部材１４と、弁座部材１４に取り付けられて実質的な弁座面をなすゴム状弾性体製のＯリング１５と、弁座部材１４に係合固定された篭状のホルダ部材１６と、ホルダ部材１６内に設けられた板状の弁体１７とにより構成されている。弁体１７は、両面に作用する流体圧の差により図にて上下方向に移動し、Ｏリング１５に着座することにより、弁ポート１３を閉じて逆止作用を行う。   The check valve assembly 12 includes a valve seat member 14 having a valve port 13, a rubber-like elastic O-ring 15 attached to the valve seat member 14 to form a substantial valve seat surface, and the valve seat member 14. And a plate-like valve body 17 provided in the holder member 16. The valve body 17 moves in the vertical direction in the figure due to the difference in fluid pressure acting on both surfaces, and sits on the O-ring 15 to close the valve port 13 and perform a check action.

管体１１、弁座部材１４、ホルダ部材１６、弁体１７のすべてがステンレス鋼により構成されている。Ｏリング１５の表面は、弁体１７の貼り付き防止のために、非粘着処理、例えば、ＤＬＣ（ダイヤモンド・ライク・カーボン）コーティングされている。   The pipe body 11, the valve seat member 14, the holder member 16, and the valve body 17 are all made of stainless steel. The surface of the O-ring 15 is coated with a non-adhesive treatment such as DLC (Diamond Like Carbon) to prevent the valve element 17 from sticking.

弁座部材１４の外径は、管体１１の内径にほぼ等しいか、管体１１の内径より少し小さく、弁座部材１４は、管体１１に嵌合した状態での、図示のような弁座部材１４の外周面と管体１１の内周面との間の、管体１１の外周面１１Ａ側からの全周シーム溶接によって管体１１に固定されている。このシーム溶接部は、図１において符号１８により示されている。 The outer diameter of the valve seat member 14 is substantially equal to the inner diameter of the tube body 11 or slightly smaller than the inner diameter of the tube body 11, and the valve seat member 14 is fitted to the tube body 11 as shown in the figure. The outer peripheral surface of the seat member 14 and the inner peripheral surface of the tube body 11 are fixed to the tube body 11 by all-around seam welding from the outer peripheral surface 11A side of the tube body 11. This seam weld is indicated by reference numeral 18 in FIG.

逆止弁１０の製造は、図２に示されているように、管体１１の一方の端部より管体１１内に逆止弁組立体１２の全体を挿入し、溶接用電極を兼ねた位置決め部材５１を弁座部材１４に当接させて逆止弁組立体１２の管体１１内における軸線方向の位置決めを行う。   As shown in FIG. 2, the check valve 10 is manufactured by inserting the entire check valve assembly 12 into the tube body 11 from one end of the tube body 11 and also serving as a welding electrode. The positioning member 51 is brought into contact with the valve seat member 14 to position the check valve assembly 12 in the axial direction in the tube body 11.

この後、図２に示すように、溶接用電極を兼ねた位置決め部材５１を弁座部材１４に当接させて逆止弁組立体１２の管体１１内における軸線方向の位置決めを行った状態で、回転（自転）する円板溶接電極５２を管体１１の外周面１１Ａ（管体１１と弁座部材１４とが径方向に重合している部位の外周面１１Ａ）に押し付け、管体１１を自身の中心軸線周りに回転させ、管体１１の全周に亘ってシーム溶接を行う。すなわち、全周シーム溶接の間中、溶接用電極を兼ねた位置決め部材５１を弁座部材１４に当接させて逆止弁組立体１２の管体１１内における軸線方向の位置決めを行っている。 After that, as shown in FIG. 2, the positioning member 51 that also serves as a welding electrode is brought into contact with the valve seat member 14 and the check valve assembly 12 is positioned in the axial direction in the tubular body 11. Then, the rotating (autorotating) disk welding electrode 52 is pressed against the outer peripheral surface 11A of the tube body 11 (the outer peripheral surface 11A where the tube body 11 and the valve seat member 14 are superposed in the radial direction). It is rotated around its own central axis, and seam welding is performed over the entire circumference of the tube body 11. That is, during the entire circumference seam welding, the positioning member 51 that also serves as a welding electrode is brought into contact with the valve seat member 14 to position the check valve assembly 12 in the axial direction in the tubular body 11.

このシーム溶接の深さが管体１１の管肉厚より大きい値に設定されていることにより、図示のように弁座部材１４の外周面と管体１１の内周面との間が管体１１の外周面側から全周に亘って気密にシーム溶接され、弁座部材１４が管体１１に固定される。 Since the depth of the seam welding is set to a value larger than the pipe wall thickness of the pipe body 11 , the pipe body has a gap between the outer peripheral surface of the valve seat member 14 and the inner peripheral surface of the pipe body 11 as shown in the figure. The valve seat member 14 is fixed to the tubular body 11 by air-tight seam welding over the entire circumference from the outer peripheral surface side of 11.

この実施形態の製造方法により製造された逆止弁１０は、溶接構造の管体内蔵型の逆止弁であって、管体１１内に挿入された逆止弁組立体１２の弁座部材１４がシーム溶接（シーム溶接部１８）により管体１１に固定されているから、管体１１の外部への流体リークや、管体１１と弁座部材１４との隙間からの流体漏れの虞れがなく、製造上の不良品発生の低減を実現でき、管体１１も一つで済み、部品点数が増えることがない。 The check valve 10 manufactured by the manufacturing method according to this embodiment is a welded structure built-in check valve, and is a valve seat member 14 of the check valve assembly 12 inserted into the tube 11. Is fixed to the tube body 11 by seam welding (the seam welded portion 18), there is a risk of fluid leakage to the outside of the tube body 11 and fluid leakage from the gap between the tube body 11 and the valve seat member 14. In addition, the production of defective products can be reduced, and only one tube 11 is required, so that the number of parts does not increase.

この発明の製造方法により製造される逆止弁は、上述したものに限定されることなく、たとえば、図３に示されているように、弁座面が、Ｏリング１５に代えて、弁座部材１４に焼付装着されたリング状のゴム状弾性部材１９によって構成される構造のものでよい。この場合も、ゴム状弾性部材１９の表面は、弁体１７の貼り付き防止のために、非粘着処理、例えば、ＤＬＣ（ダイヤモンド・ライク・カーボン）コーティングされていることが好ましい。 Check valve manufactured by the manufacturing method of the present invention is not limited to be the above mentioned, for example, as shown in FIG. 3, the valve seat surface, in place of the O-ring 15, It may have a structure constituted by a ring-like rubber-like elastic member 19 baked on the valve seat member 14. Also in this case, the surface of the rubber-like elastic member 19 is preferably coated with a non-adhesive treatment, for example, DLC (Diamond Like Carbon) to prevent the valve element 17 from sticking.

また、管体１１や弁座部材１４は、シーム溶接が可能である限り、この実施形態で説明したステンレス鋼以外の材質のものであってもよい。   Moreover, the pipe body 11 and the valve seat member 14 may be made of a material other than the stainless steel described in this embodiment as long as seam welding is possible.

この発明の製造方法により製造される逆止弁の一つの形態を示す断面図である。It is a cross-sectional view showing one form state of the check valve manufactured by the manufacturing method of the present invention. この発明による逆止弁の製造方法の一つの実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the manufacturing method of the non-return valve by this invention. この発明の製造方法により製造される逆止弁の他の形態を示す断面図である。It is a sectional view showing another form state of the check valve produced by the method of the present invention.

符号の説明Explanation of symbols

１０ 逆止弁
１１ 管体
１２ 逆止弁組立体
１３ 弁ポート
１４ 弁座部材
１５ Ｏリング
１６ ホルダ部材
１７ 弁体
１８ シーム溶接部
１９ ゴム状弾性部材
５２ 円板溶接電極 DESCRIPTION OF SYMBOLS 10 Check valve 11 Tubing body 12 Check valve assembly 13 Valve port 14 Valve seat member 15 O-ring 16 Holder member 17 Valve body 18 Seam welding part 19 Rubber-like elastic member 52 Disc welding electrode

Claims (1)

管体内に弁座部材と弁体とを含む逆止弁組立体を挿入して前記弁座部材を前記管体に嵌合させ、
前記弁座部材が前記管体に嵌合された状態で、回転する円板溶接電極を前記管体の外周面に押し付けて前記円板溶接電極と前記管体とを相対的に前記管体の外周面周りに回転させて前記弁座部材の外周面と前記管体の内周面との間を前記管体の外周面側から全周シーム溶接することにより、前記弁座部材を前記管体に固定し、
前記全周シーム溶接の間中、溶接用電極を兼ねた位置決め部材を前記弁座部材に当接させて前記逆止弁組立体の前記管体内における軸線方向の位置決めを行う
ことを特徴とする逆止弁の製造方法。 Inserting a check valve assembly including a valve seat member and a valve body into the pipe body, and fitting the valve seat member to the pipe body;
In a state where the valve seat member is fitted to the tubular body, a rotating disk welding electrode is pressed against the outer peripheral surface of the tubular body so that the disk welding electrode and the tubular body are relatively moved relative to the tubular body. The valve seat member is rotated around the outer peripheral surface and seam welded from the outer peripheral surface side of the tubular body between the outer peripheral surface of the valve seat member and the inner peripheral surface of the tubular body, thereby removing the valve seat member from the tubular body. Fixed to
During the all-round seam welding, a positioning member that also serves as a welding electrode is brought into contact with the valve seat member to position the check valve assembly in the axial direction in the pipe body. Manufacturing method of stop valve.
JP2004023621A 2004-01-30 2004-01-30 Check valve manufacturing method Expired - Lifetime JP4486826B2 (en)

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JP2004023621A JP4486826B2 (en) 2004-01-30 2004-01-30 Check valve manufacturing method

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JP4486826B2 true JP4486826B2 (en) 2010-06-23

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JP7362558B2 (en) * 2020-07-17 2023-10-17 株式会社鷺宮製作所 Check valves and refrigeration cycle systems
CN216200856U (en) * 2021-10-22 2022-04-05 台州韩进泵业有限公司 Novel flange for water inlet of jet pump

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