JP2015025507A - Four-way selector valve and method of welding lockscrew of four-way selector valve - Google Patents

Four-way selector valve and method of welding lockscrew of four-way selector valve Download PDF

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JP2015025507A
JP2015025507A JP2013155374A JP2013155374A JP2015025507A JP 2015025507 A JP2015025507 A JP 2015025507A JP 2013155374 A JP2013155374 A JP 2013155374A JP 2013155374 A JP2013155374 A JP 2013155374A JP 2015025507 A JP2015025507 A JP 2015025507A
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valve
fixing screw
piston
guide plate
welding
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JP5916139B2 (en
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雅弘 村田
Masahiro Murata
雅弘 村田
宏光 木村
Hiromitsu Kimura
宏光 木村
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Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/0655—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with flat slides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Housings (AREA)
  • Multiple-Way Valves (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a four-way selector valve such that a lockscrew for fixing a piston to coupling metal fittings is securely prevented from being loosened, the number of components is decreased, and trouble in manufacture is saved.SOLUTION: A piston valve is accommodated in a valve housing. The piston valve comprises first and second pistons 1 and 2, coupling metal fittings 3, and a valve body. The piston 1 comprises a packing 11, a guide plate 12, a toothed lock spring 13, and a reinforcing plate 14. The piston 2 comprises a packing 21, a guide plate 22, a toothed lock spring 23, and a reinforcing plate 24. The piston 1 is fixed to a vertical plate 31 of the coupling metal fittings 3 with lockscrews N1, N2. The piston 2 is fixed to a vertical plate 32 of the coupling metal fittings 3 with lockscrews N3, N4. Molten layers P1, P2 are formed by resistance welding at a contact place between the lockscrew N1 and the guide plate 12 and at a contact place between the lockscrew N2 and the guide plate 12. Molten layers P3, P4 are formed by resistance welding at a contact place between the lockscrew N3 and the guide plate 22 and at a contact place between the lockscrew N4 and the guide plate 22.

Description

本発明は、椀状の弁体を保持する連結金具の両端にピストンを有するピストン弁と、ピストン弁を収容する弁ハウジングとを有し、流体の圧力でピストン弁を移動して流路を切り換えるようにした四方切換弁に関し、詳細にはそのピストン弁の構造及びその固定ねじの溶接方法に関する。   The present invention has a piston valve having pistons at both ends of a coupling fitting that holds a bowl-shaped valve body, and a valve housing that houses the piston valve, and the flow path is switched by moving the piston valve with fluid pressure. More specifically, the present invention relates to a structure of the piston valve and a method of welding the fixing screw.

従来、この種の四方切換弁におけるピストン弁として、例えば特開２００９−１４４８８０号公報（特許文献１）に開示されたピストン装置がある。この特許文献１には、従来のピストン装置は、補助ばねとパッキンを挟持プレートで挟み、プレート部材を当てがってリベットでかしめ固定することでピストン単体を組み立てている。そして、このピストン単体の２つを連結板（連結金具）の端部にそれぞれボルト（固定ねじ）にて締結したものである。また、他の例として、挟持プレート、パッキン、補助ばね及びプレート部材を備え、これらの部材をボルトにて連結板に締結したものが開示されている。そして、これら従来のピストン装置では、かしめプレートあるいはプレート部材により、ボルトの回り止めを行うようにしている。   Conventionally, as a piston valve in this type of four-way switching valve, for example, there is a piston device disclosed in Japanese Unexamined Patent Application Publication No. 2009-144880 (Patent Document 1). According to Patent Document 1, a conventional piston device assembles a single piston by sandwiching an auxiliary spring and packing with a sandwiching plate, applying a plate member, and fixing with a rivet. The two pistons are fastened to the ends of the connecting plate (connecting bracket) with bolts (fixing screws). As another example, there is disclosed a sandwiching plate, a packing, an auxiliary spring, and a plate member that are fastened to a connecting plate with bolts. In these conventional piston devices, the bolts are prevented from rotating by caulking plates or plate members.

特開２００９−１４４８８０号公報JP 2009-144880 A

前記従来のピストン弁（ピストン装置）では、ボルトの回り止めのために、かしめプレートやプレート部材を用いるようにしている。このようにボルトの回り止めは、ピストン装置の耐久性を高めるために必要であるが、かしめプレートやプレート部材を用いると、部品点数が増加するとともに組み付け作業に手間がかかり、コストアップになるという問題がある。   In the conventional piston valve (piston device), a caulking plate or a plate member is used to prevent the bolt from rotating. In this way, the rotation prevention of the bolt is necessary to increase the durability of the piston device. However, when a caulking plate or a plate member is used, the number of parts increases and the assembling work takes time and the cost increases. There's a problem.

本発明は、四方切換弁において、ピストンを連結金具に固定する固定ねじのゆるみを確実に防止して高耐久性を確保するとともに、部品点数と製造上の手間を低減することを課題とする。   In the four-way switching valve, an object of the present invention is to reliably prevent loosening of a fixing screw that fixes a piston to a connecting metal fitting to ensure high durability, and to reduce the number of parts and manufacturing labor.

請求項１の四方切換弁は、筒状の弁ハウジングと、連結金具の両端にピストンが取り付けられるとともに前記連結金具の中央に椀状の弁体を保持して前記弁ハウジング内に収容されたピストン弁と、前記弁体に対向して前記弁ハウジング内に配置された弁座とを備え、前記２つのピストンにより、前記弁ハウジング内を中央部の主弁室と該主弁室の両側の２つの副弁室とを画定し、前記２つの副弁室のうち減圧された副弁室内と前記主弁室内との差圧により前記ピストン弁を移動して、前記弁座及び弁ハウジングに接続される配管を流れる流体の流路を切り換えるようにした四方切換弁において、前記各ピストンは、前記弁ハウジングの内周に摺接するパッキンと、該パッキンを前記連結金具の端部の立板側に押圧する導電性のガイド板とを有し、該ピストンは、前記ガイド板及び前記パッキンを貫通して前記立板にねじ止めされる導電性の固定ねじにより前記連結金具に固定され、前記固定ねじと前記ガイド板との当接箇所、または、前記固定ねじと前記立板との螺合部が、抵抗溶接されていることを特徴とする。   The four-way switching valve according to claim 1 is a piston that is accommodated in a tubular valve housing and a piston that is attached to both ends of the coupling fitting and that has a hook-like valve body in the center of the coupling fitting. A valve seat and a valve seat disposed in the valve housing so as to face the valve body, and the two pistons cause a central main valve chamber and two on both sides of the main valve chamber to be inside the valve housing. One sub-valve chamber is defined, and the piston valve is moved by a differential pressure between the sub-valve chamber and the main valve chamber, which is reduced in pressure between the two sub-valve chambers, and is connected to the valve seat and the valve housing. In the four-way switching valve that switches the flow path of the fluid flowing through the piping, each piston presses the packing against the inner periphery of the valve housing, and the packing toward the upright side of the end of the connecting fitting A conductive guide plate The piston is fixed to the coupling metal by a conductive fixing screw that passes through the guide plate and the packing and is screwed to the standing plate, and a contact portion between the fixing screw and the guide plate, Or the screwing part of the said fixing screw and the said standing board is resistance-welded, It is characterized by the above-mentioned.

請求項２の四方切換弁における固定ねじの溶接方法は、前記ピストンの同一ピストン側に２つの前記固定ねじを有し、前記固定ねじと前記ガイド板との当接箇所が前記抵抗溶接されている請求項１に記載の四方切換弁における固定ねじの溶接方法であって、前記同一ピストンにおける２つの固定ねじ間に溶接電流を通電して当該２つの固定ねじを抵抗溶接するようにしたことを特徴とする。   The fixing screw welding method in the four-way switching valve according to claim 2 has two fixing screws on the same piston side of the piston, and the contact point between the fixing screw and the guide plate is resistance-welded. The fixing screw welding method for a four-way switching valve according to claim 1, wherein a welding current is passed between the two fixing screws of the same piston so that the two fixing screws are resistance-welded. And

請求項３の四方切換弁における固定ねじの溶接方法は、請求項２に記載の四方切換弁における固定ねじの溶接方法であって、前記抵抗溶接の前に、前記固定ねじと前記ガイド板との当接箇所の、前記固定ねじまたは前記ガイド板の何れか一方に凸部を形成しておくことを特徴とする。   The fixing screw welding method in the four-way switching valve according to claim 3 is a welding method of the fixing screw in the four-way switching valve according to claim 2, wherein the fixing screw and the guide plate are welded before the resistance welding. A convex portion is formed on either one of the fixing screw or the guide plate at the contact portion.

請求項４の四方切換弁における固定ねじの溶接方法は、前記固定ねじと前記立板との螺合部が前記抵抗溶接されている請求項１に記載の四方切換弁における固定ねじの溶接方法であって、前記２つのピストンにおける一方のピストン側の固定ねじと他方のピストン側の固定ねじとの間に溶接電流を通電して当該２つの固定ねじを抵抗溶接するようにしたことを特徴とする。   The fixing screw welding method in the four-way switching valve according to claim 4 is a welding method of the fixing screw in the four-way switching valve according to claim 1, wherein a screwing portion between the fixing screw and the vertical plate is resistance-welded. The two pistons are resistance-welded by energizing a welding current between one piston-side fixing screw and the other piston-side fixing screw of the two pistons. .

請求項１の四方切換弁によれば、ピストン弁の各ピストンは、弁ハウジングの内周に摺接するパッキンと、パッキンを連結金具の端部の立板側に押圧する導電性のガイド板とを有し、ピストンは、ガイド板及びパッキンを貫通して立板にねじ止めされる導電性の固定ねじにより連結金具に固定され、固定ねじとガイド板との当接箇所、または、固定ねじと立板との螺合部が、抵抗溶接されているので、この抵抗溶接による溶融層により固定ねじのゆるみを確実に防止することができ、また、ゆるみ防止のために他の部材を要せず、組み付け作業も容易になる。   According to the four-way switching valve of the first aspect, each piston of the piston valve includes a packing that is slidably contacted with the inner periphery of the valve housing, and a conductive guide plate that presses the packing toward the upright side of the end of the coupling metal. The piston is fixed to the connecting bracket by a conductive fixing screw that passes through the guide plate and the packing and is screwed to the standing plate, and the abutment point between the fixing screw and the guide plate, or the fixing screw and the standing screw. Since the screwed portion with the plate is resistance welded, it is possible to reliably prevent the fixing screw from loosening by the molten layer by this resistance welding, and no other member is required to prevent loosening, Assembly work is also easy.

請求項２の四方切換弁における固定ねじの溶接方法によれば、請求項１の四方切換弁が得られるとともに、同一ピストンにおける２つの固定ねじ間に溶接電流を通電して当該２つの固定ねじを抵抗溶接するので、同じ側の固定ねじに電極を接続すればよいので、溶接作業が容易になる。   According to the welding method of the fixing screw in the four-way switching valve of claim 2, the four-way switching valve of claim 1 is obtained, and a welding current is passed between the two fixing screws in the same piston so that the two fixing screws are connected. Since resistance welding is performed, it is only necessary to connect the electrode to the fixing screw on the same side, so that the welding operation is facilitated.

請求項３の四方切換弁における固定ねじの溶接方法によれば、請求項２の効果が得られるとともに、凸部の箇所での電気抵抗が高くなり固定ねじとガイド板とをより確実に溶接することができる。   According to the fixing screw welding method in the four-way switching valve of claim 3, the effect of claim 2 can be obtained, and the electric resistance at the convex portion is increased, so that the fixing screw and the guide plate are welded more reliably. be able to.

請求項４の四方切換弁における固定ねじの溶接方法によれば、請求項１の四方切換弁が得られるとともに、連結金具を挟む２つのピストン側の固定ねじに対して２極の電極を挟みこむように接続するので、電極と固定ねじとを容易に確実に接続できる。   According to the welding method of the fixing screw in the four-way switching valve of claim 4, the four-way switching valve of claim 1 is obtained, and a two-pole electrode is sandwiched between the two piston-side fixing screws that sandwich the coupling fitting. Therefore, the electrode and the fixing screw can be easily and reliably connected.

本発明の実施形態における四方切換弁の一部破砕側面図である。It is a partially fractured side view of the four-way switching valve in the embodiment of the present invention. 第１実施形態の四方切換弁におけるピストン弁の一部破砕要部拡大図である。It is a partial crushing principal part enlarged view of the piston valve in the four-way selector valve of 1st Embodiment. 第１実施形態のピストン弁における固定ねじの溶接方法を示す図である。It is a figure which shows the welding method of the fixing screw in the piston valve of 1st Embodiment. 第１実施形態における凸部の例を示す図である。It is a figure which shows the example of the convex part in 1st Embodiment. 第２実施形態の四方切換弁におけるピストン弁の一部破砕要部拡大図である。It is a partial crushing principal part enlarged view of the piston valve in the four-way selector valve of 2nd Embodiment. 第２実施形態のピストン弁における固定ねじの溶接方法を示す図である。It is a figure which shows the welding method of the fixing screw in the piston valve of 2nd Embodiment.

次に、本発明の実施形態について説明する。図１は実施形態における四方切換弁の一部破砕側面図である。この実施形態の四方切換弁は、円筒状の主弁室Ａ、第１及び第２の副弁室Ｂ１，Ｂ２を構成する弁ハウジング１０と、弁ハウジング１０内に収容されたピストン弁２０と、弁ハウジング１０内に配置された弁座３０とを備えている。ピストン弁２０は、第１のピストン１と、第２のピストン２と、ステンレス製の連結金具３と、椀状の弁体４とで構成されている。第１及び第２のピストン１，２は連結金具３の両端にそれぞれ取り付けられ、弁体４は連結金具３の中央の嵌合孔３ａ内に嵌め込まれて連結金具３に保持されている。   Next, an embodiment of the present invention will be described. FIG. 1 is a partially broken side view of a four-way switching valve in an embodiment. The four-way switching valve of this embodiment includes a cylindrical main valve chamber A, a valve housing 10 that constitutes the first and second auxiliary valve chambers B1, B2, a piston valve 20 housed in the valve housing 10, And a valve seat 30 disposed in the valve housing 10. The piston valve 20 includes a first piston 1, a second piston 2, a stainless steel coupling fitting 3, and a bowl-shaped valve body 4. The first and second pistons 1 and 2 are respectively attached to both ends of the connection fitting 3, and the valve body 4 is fitted into the fitting hole 3 a at the center of the connection fitting 3 and held by the connection fitting 3.

第１及び第２のピストン１，２は、弁ハウジング１０内を中央部の主弁室Ａとその両側の２つの副弁室Ｂ１，Ｂ２とを画定している。この四方切換弁には図示しない例えばパイロット弁が接続されており、このパイロット弁により高圧流体が副弁室Ｂ１または副弁室Ｂ２に供給される。このとき、他方の副弁室Ｂ２または副弁室Ｂ１は低圧側に導通される。これにより、一方の副弁室Ｂ１または副弁室Ｂ２が高圧になるとともに、他方の副弁室Ｂ２または副弁室Ｂ１が減圧される。そして、ピストン１及びピストン２に加わる圧力の差圧によりピストン弁２０が移動して弁体４の位置が切り換えられ、弁座３０及び弁ハウジング１０に接続される配管４０ａ〜４０ｄを流れる流体の流路が切り換わる。   The first and second pistons 1 and 2 define a main valve chamber A at the center and two sub valve chambers B1 and B2 on both sides of the valve housing 10. For example, a pilot valve (not shown) is connected to the four-way switching valve, and high pressure fluid is supplied to the sub valve chamber B1 or the sub valve chamber B2 by the pilot valve. At this time, the other sub valve chamber B2 or sub valve chamber B1 is conducted to the low pressure side. Thereby, one sub valve chamber B1 or sub valve chamber B2 becomes high pressure, and the other sub valve chamber B2 or sub valve chamber B1 is decompressed. Then, the piston valve 20 is moved by the differential pressure between the pressures applied to the piston 1 and the piston 2, the position of the valve body 4 is switched, and the flow of fluid flowing through the pipes 40a to 40d connected to the valve seat 30 and the valve housing 10 The road changes.

図２は第１実施形態の四方切換弁におけるピストン弁２０の一部破砕要部拡大図である。第１のピストン１は、弁ハウジング１０の内周に摺接するパッキン１１、ガイド板１２、菊ばね（板ばね）１３及び補強板１４で構成されている。パッキン１１は弾性素材であり、ガイド板１２、菊ばね１３及び補強板１４はそれぞれステンレス製である。パッキン１１と菊ばね１３はガイド板１２と補強板１４に挟まれ、図示しないリベットによりこれらパッキン１１、菊ばね１３、ガイド板１２、補強板１４が一体に組み付けられている。連結金具３の立板３１にはねじ孔３１１，３１２が形成されており、固定ねじＮ１と固定ねじＮ２が、ガイド板１２、パッキン１１、菊ばね１３及び補強板１４を貫通して立板３１のねじ孔３１１，３１２にそれぞれねじ止めされている。これにより、ピストン１が連結金具３の端部に固定されている。   FIG. 2 is an enlarged view of a part of the crushing part of the piston valve 20 in the four-way switching valve of the first embodiment. The first piston 1 includes a packing 11 slidably contacting the inner periphery of the valve housing 10, a guide plate 12, a chrysanthemum spring (plate spring) 13, and a reinforcing plate 14. The packing 11 is an elastic material, and the guide plate 12, the chrysanthemum spring 13, and the reinforcing plate 14 are each made of stainless steel. The packing 11 and the chrysanthemum spring 13 are sandwiched between the guide plate 12 and the reinforcing plate 14, and the packing 11, the chrysanthemum spring 13, the guide plate 12, and the reinforcing plate 14 are assembled together by rivets (not shown). Screw holes 311 and 312 are formed in the standing plate 31 of the connection fitting 3, and the fixing screw N <b> 1 and the fixing screw N <b> 2 pass through the guide plate 12, the packing 11, the chrysanthemum spring 13 and the reinforcing plate 14, and the standing plate 31. The screw holes 311 and 312 are respectively screwed. As a result, the piston 1 is fixed to the end of the connection fitting 3.

同様に、第２のピストン２は、弁ハウジング１０の内周に摺接するパッキン２１、ガイド板２２、菊ばね２３及び補強板２４で構成されている。パッキン２１は弾性素材であり、ガイド板２２、菊ばね２３及び補強板２４はそれぞれステンレス製である。パッキン２１と菊ばね２３はガイド板２２と補強板２４に挟まれ、図示しないリベットによりこれらパッキン２１、菊ばね２３、ガイド板２２、補強板２４が一体に組み付けられている。連結金具３の立板３２側に押圧されている。立板３２にはねじ孔３２１，３２２が形成されており、固定ねじＮ３と固定ねじＮ４が、ガイド板２２、パッキン２１、菊ばね２３及び補強板２４を貫通して立板３２のねじ孔３２１，３２２にそれぞれねじ止めされている。これにより、ピストン２が連結金具３の端部に固定されている。   Similarly, the second piston 2 includes a packing 21 slidably contacting the inner periphery of the valve housing 10, a guide plate 22, a chrysanthemum spring 23, and a reinforcing plate 24. The packing 21 is an elastic material, and the guide plate 22, the chrysanthemum spring 23, and the reinforcing plate 24 are each made of stainless steel. The packing 21 and the chrysanthemum spring 23 are sandwiched between a guide plate 22 and a reinforcing plate 24, and the packing 21, chrysanthemum spring 23, guide plate 22, and reinforcing plate 24 are assembled together by a rivet (not shown). It is pressed to the upright plate 32 side of the connecting fitting 3. Screw holes 321 and 322 are formed in the standing plate 32, and the fixing screw N 3 and the fixing screw N 4 penetrate the guide plate 22, the packing 21, the chrysanthemum spring 23 and the reinforcing plate 24, and the screw holes 321 of the standing plate 32. , 322 are respectively screwed. As a result, the piston 2 is fixed to the end of the connection fitting 3.

固定ねじＮ１とガイド板１２との当接箇所、固定ねじＮ２とガイド板１２との当接箇所には、それぞれ抵抗溶接による溶融層Ｐ１，Ｐ２が形成されている。また、固定ねじＮ３とガイド板２２との当接箇所、固定ねじＮ４とガイド板２２との当接箇所には、それぞれ抵抗溶接による溶融層Ｐ３，Ｐ４が形成されている。この溶融層Ｐ１，Ｐ２，Ｐ３，Ｐ４により、固定ねじＮ１，Ｎ２，Ｎ３，Ｎ４のゆるみ（回転）が防止される。   Molten layers P1 and P2 are formed by resistance welding at the contact points between the fixing screw N1 and the guide plate 12 and at the contact points between the fixing screw N2 and the guide plate 12, respectively. In addition, melted layers P3 and P4 are formed by resistance welding at the contact point between the fixing screw N3 and the guide plate 22 and at the contact point between the fixing screw N4 and the guide plate 22, respectively. The molten layers P1, P2, P3, and P4 prevent loosening (rotation) of the fixing screws N1, N2, N3, and N4.

図３は第１実施形態のピストン弁２０における固定ねじＮ１，Ｎ２の溶接方法を示す図である。この第１実施形態では、固定ねじＮ１と固定ねじＮ２とを立板３１にねじ止めして第１のピストン１を固定した後、図３(A) に示すように、固定ねじＮ１と固定ねじＮ２とに電極を接触させ、溶接電源により固定ねじＮ１と固定ねじＮ２との間に溶接電流を通電する。これにより、図３(B) に矢印で示すように固定ねじＮ１→ガイド板１２→固定ねじＮ２と溶接電流を流し、前記溶融層Ｐ１，Ｐ２を形成する。なお、固定ねじＮ３，Ｎ４についても同様に、固定ねじＮ３と固定ねじＮ４の間に溶接電流を通電し、固定ねじＮ３→ガイド板２２→固定ねじＮ４と溶接電流を流し、前記溶融層Ｐ３，Ｐ４を形成する。   FIG. 3 is a diagram showing a welding method for the fixing screws N1 and N2 in the piston valve 20 of the first embodiment. In the first embodiment, the fixing screw N1 and the fixing screw N2 are screwed to the upright plate 31 to fix the first piston 1, and then, as shown in FIG. An electrode is brought into contact with N2, and a welding current is applied between the fixing screw N1 and the fixing screw N2 by a welding power source. As a result, as shown by the arrow in FIG. 3B, the welding current flows through the fixing screw N1 → the guide plate 12 → the fixing screw N2, thereby forming the molten layers P1 and P2. Similarly, for the fixing screws N3 and N4, a welding current is passed between the fixing screw N3 and the fixing screw N4, and a welding current is passed between the fixing screw N3 → the guide plate 22 → the fixing screw N4, and the molten layer P3, P4 is formed.

固定ねじＮ１，Ｎ２とガイド板１２との接触部の抵抗、固定ねじＮ３，Ｎ４とガイド板２２との接触部の抵抗をそれぞれ高めるために、固定ねじＮ１，Ｎ２，Ｎ３，Ｎ４またはガイド板１２，２２の接触面に凸部を設けるようにしてもよい。例えば、図４(A) のような点状の凸部ａ、図４(B) のような線状の凸部ｂ、あるいは図４(C) のような曲線状の凸部ｃを設けるようにしてもよい。また、固定ねじＮ１，Ｎ２とガイド板１２との間、固定ねじＮ３，Ｎ４とガイド板２２との間に、ワッシャを設けて接触部の抵抗を高めるようにしてもよい。   In order to increase the resistance of the contact portion between the fixing screws N1, N2 and the guide plate 12 and the resistance of the contact portion between the fixing screws N3, N4 and the guide plate 22, respectively, the fixing screws N1, N2, N3, N4 or the guide plate 12 , 22 may be provided with convex portions. For example, a dot-like convex portion a as shown in FIG. 4A, a linear convex portion b as shown in FIG. 4B, or a curved convex portion c as shown in FIG. 4C is provided. It may be. Further, a washer may be provided between the fixing screws N1, N2 and the guide plate 12 and between the fixing screws N3, N4 and the guide plate 22 to increase the resistance of the contact portion.

なお、ピストン弁２０において、固定ねじＮ１，Ｎ２あるいは固定ねじＮ３，Ｎ４をねじ止めして溶接する際には、図１に示すキャップ部１０ａ，１０ｂを外した弁ハウジング１０内に、弁体４を保持した連結金具３を配置した状態で作業をする必要がある。これは、ピストン弁２０を先に組み付けてしまうと、弁座３０があるためピストン弁２０を弁ハウジング１０内に配置することができないためである。少なくとも両方のピストン１，２を連結金具３に取り付けておくことはできない。したがって、少なくとも一方のピストンについては内側からの加工等を行うことができない。しかしながら、本発明による抵抗溶接によれば、いずれの固定ねじＮ１，Ｎ２，Ｎ３，Ｎ４も弁ハウジング１０の端部から露出させることができるので、容易に作業を行うことができる。   In the piston valve 20, when the fixing screws N1, N2 or the fixing screws N3, N4 are screwed and welded, the valve body 4 is inserted into the valve housing 10 from which the cap portions 10a, 10b shown in FIG. It is necessary to work in a state in which the connecting metal fitting 3 holding the is disposed. This is because if the piston valve 20 is assembled first, the piston valve 20 cannot be disposed in the valve housing 10 because of the valve seat 30. At least both of the pistons 1 and 2 cannot be attached to the connecting fitting 3. Therefore, at least one piston cannot be processed from the inside. However, according to the resistance welding according to the present invention, any of the fixing screws N1, N2, N3, and N4 can be exposed from the end of the valve housing 10, so that the operation can be easily performed.

図５は第２実施形態の四方切換弁におけるピストン弁２０の一部破砕要部拡大図である。この第２実施形態と第１実施形態との違いは、固定ねじＮ１，Ｎ２，Ｎ３，Ｎ４に対する溶接箇所の違いだけである。その他の構成は同様でああり、重複する説明は省略する。   FIG. 5 is an enlarged view of part of the crushing part of the piston valve 20 in the four-way switching valve of the second embodiment. The only difference between the second embodiment and the first embodiment is the difference in the welding locations for the fixing screws N1, N2, N3, and N4. Other configurations are the same, and redundant description is omitted.

この第２実施形態では、固定ねじＮ１と固定ねじＮ２を立板３１のねじ孔３１１，３１２にそれぞれねじ止めした螺合部には、それぞれ抵抗溶接による溶融層Ｐ５，Ｐ６が形成されている。また、固定ねじＮ３と固定ねじＮ４を立板３２のねじ孔３２１，３２２にそれぞれねじ止めした螺合部には、それぞれ抵抗溶接による溶融層Ｐ７，Ｐ８が形成されている。そして、この溶融層Ｐ５，Ｐ６，Ｐ７，Ｐ８により、固定ねじＮ１，Ｎ２，Ｎ３，Ｎ４のゆるみ（回転）が防止される。   In the second embodiment, melted layers P5 and P6 are formed by resistance welding at screwed portions where the fixing screw N1 and the fixing screw N2 are screwed into the screw holes 311 and 312 of the upright plate 31, respectively. In addition, melted layers P7 and P8 are formed by resistance welding at screwed portions where the fixing screw N3 and the fixing screw N4 are screwed into the screw holes 321 and 322 of the upright plate 32, respectively. Then, the melted layers P5, P6, P7, and P8 prevent the fixing screws N1, N2, N3, and N4 from loosening (rotating).

図６は第２実施形態のピストン弁２０における固定ねじＮ１，Ｎ３の溶接方法を示す図である。この第２実施形態では、図６(A) に示すように、固定ねじＮ１と固定ねじＮ３とに電極を接触させ、溶接電源により固定ねじＮ１と固定ねじＮ３との間に溶接電流を通電する。これにより、図６(B) に矢印で示すように固定ねじＮ１→立板３１→連結金具３→立板３２→固定ねじＮ３と溶接電流を流し、前記溶融層Ｐ５，Ｐ７を形成する。なお、固定ねじＮ２，Ｎ４についても同様に、固定ねじＮ２と固定ねじＮ４の間に溶接電流を通電し、固定ねじＮ２→立板３１→連結金具３→立板３２→固定ねじＮ４と溶接電流を流し、前記溶融層Ｐ６，Ｐ８を形成する。このように、第２実施形態におけるピストン弁２０はステンレス製の連結金具３を介して抵抗溶接している。   FIG. 6 is a view showing a welding method for the fixing screws N1 and N3 in the piston valve 20 of the second embodiment. In the second embodiment, as shown in FIG. 6A, electrodes are brought into contact with the fixing screw N1 and the fixing screw N3, and a welding current is passed between the fixing screw N1 and the fixing screw N3 by a welding power source. . As a result, as shown by an arrow in FIG. 6B, a welding current flows through the fixing screw N1, the upright plate 31, the connecting bracket 3, the upright plate 32, and the fixing screw N3, thereby forming the molten layers P5 and P7. Similarly, with respect to the fixing screws N2 and N4, a welding current is passed between the fixing screw N2 and the fixing screw N4, and the fixing screw N2, the standing plate 31, the connecting bracket 3, the standing plate 32, and the fixing screw N4 and the welding current. The molten layers P6 and P8 are formed. As described above, the piston valve 20 in the second embodiment is resistance-welded through the stainless steel coupling fitting 3.

なお、固定ねじＮ１と固定ねじＮ４に通電して、溶融層Ｐ５，Ｐ８を形成し、固定ねじＮ２と固定ねじＮ３に通電して、溶融層Ｐ６，Ｐ７を形成するようにしてもよい。さらに、ピストン１側の二つの螺合部間、あるいはピストン２側の二つの螺合部間での抵抗のバラツキがすくない場合は、固定ねじＮ１と固定ねじＮ２に同一電極を接続し、固定ねじＮ３と固定ねじＮ４に同一電極を接続し、溶融層Ｐ５，Ｐ６，Ｐ７，Ｐ８を一度に形成するようにしてもよい。   Alternatively, the fixing screws N1 and N4 may be energized to form the molten layers P5 and P8, and the fixing screws N2 and N3 may be energized to form the molten layers P6 and P7. Further, when the resistance variation between the two screwed portions on the piston 1 side or between the two screwed portions on the piston 2 side is not sufficient, the same electrode is connected to the fixing screw N1 and the fixing screw N2, and the fixing screw The same electrode may be connected to N3 and the fixing screw N4 to form the molten layers P5, P6, P7, and P8 at a time.

以上の実施形態では、パッキン、菊ばね、ガイド板及び補強板をリベットにより一体に組み付け、それを固定ねじで連結金具に固定するようにしているが、組み付けるためのリベットを用いずに、固定ねじにより連結金具に固定するようにしてもよい。   In the above embodiment, the packing, chrysanthemum spring, guide plate, and reinforcing plate are assembled together by rivets, and fixed to the connecting bracket with fixing screws. However, without using the rivets for assembly, the fixing screws You may make it fix to a connection metal fitting.

以上の実施形態では固定ねじでピストンを連結金具に固定及び溶接するようにしているが、参考例として、固定ねじの代わりにリベット等の溶接片をもちい、この溶接片を介して電流を流して溶接片と連結金具とを抵抗溶接し、その溶融層によりピストンを連結金具に固定するようにしてもよい。なお、従来は、リベットで固定する場合にリベットのピストンの裏側を潰す必要があるが、四方切換弁の構造上、裏側を潰すのは極めて困難であるが、このように溶接片と連結金具とを溶接で固定するのでその必要がない。   In the above embodiment, the piston is fixed and welded to the connecting bracket with a fixing screw, but as a reference example, a welding piece such as a rivet is used instead of the fixing screw, and an electric current is passed through this welding piece. The weld piece and the connection fitting may be resistance-welded, and the piston may be fixed to the connection fitting by the molten layer. Conventionally, when fixing with a rivet, it is necessary to crush the back side of the piston of the rivet, but it is extremely difficult to crush the back side due to the structure of the four-way switching valve. This is not necessary because it is fixed by welding.

Ａ 主弁室
Ｂ１ 第１の副弁室
Ｂ２ 第２の副弁室
１０ 弁ハウジング
２０ ピストン弁
３０ 弁座
１ 第１のピストン
１１ パッキン
１２ ガイド板
１３ 菊ばね
１４ 補強板
２ 第２のピストン２
２１ パッキン
２２ ガイド板
２３ 菊ばね
２４ 補強板
３ 連結金具
３ａ 嵌合孔
３１ 立板
３１１ ねじ孔
３１２ ねじ孔
３２ 立板
３２１ ねじ孔
３２２ ねじ孔
４ 弁体
Ｎ１ 固定ねじ
Ｎ２ 固定ねじ
Ｎ３ 固定ねじ
Ｎ４ 固定ねじ
Ｐ１ 溶融層
Ｐ２ 溶融層
Ｐ３ 溶融層
Ｐ４ 溶融層
Ｐ５ 溶融層
Ｐ６ 溶融層
Ｐ７ 溶融層
Ｐ８ 溶融層 A main valve chamber B1 first subvalve chamber B2 second subvalve chamber 10 valve housing 20 piston valve 30 valve seat 1 first piston 11 packing 12 guide plate 13 chrysanthemum spring 14 reinforcing plate 2 second piston 2
21 Packing 22 Guide plate 23 Chrysanthemum spring 24 Reinforcement plate 3 Connecting bracket 3a Fitting hole 31 Standing plate 311 Screw hole 312 Screw hole 32 Standing plate 321 Screw hole 322 Screw hole 4 Valve body N1 Fixing screw N2 Fixing screw N3 Fixing screw N4 Fixing Screw P1 Molten layer P2 Molten layer P3 Molten layer P4 Molten layer P5 Molten layer P6 Molten layer P7 Molten layer P8 Molten layer

Claims (4)

筒状の弁ハウジングと、連結金具の両端にピストンが取り付けられるとともに前記連結金具の中央に椀状の弁体を保持して前記弁ハウジング内に収容されたピストン弁と、前記弁体に対向して前記弁ハウジング内に配置された弁座とを備え、前記２つのピストンにより、前記弁ハウジング内を中央部の主弁室と該主弁室の両側の２つの副弁室とを画定し、前記２つの副弁室のうち減圧された副弁室内と前記主弁室内との差圧により前記ピストン弁を移動して、前記弁座及び弁ハウジングに接続される配管を流れる流体の流路を切り換えるようにした四方切換弁において、
前記各ピストンは、前記弁ハウジングの内周に摺接するパッキンと、該パッキンを前記連結金具の端部の立板側に押圧する導電性のガイド板とを有し、該ピストンは、前記ガイド板及び前記パッキンを貫通して前記立板にねじ止めされる導電性の固定ねじにより前記連結金具に固定され、前記固定ねじと前記ガイド板との当接箇所、または、前記固定ねじと前記立板との螺合部が、抵抗溶接されていることを特徴とする四方切換弁。 A cylindrical valve housing, pistons attached to both ends of the coupling fitting, a piston valve held in the valve housing holding a bowl-shaped valve body in the center of the coupling fitting, and the valve body are opposed to each other. A valve seat arranged in the valve housing, and the two pistons define a central main valve chamber and two sub valve chambers on both sides of the main valve chamber in the valve housing, A flow path of fluid flowing through a pipe connected to the valve seat and the valve housing by moving the piston valve by a differential pressure between the decompressed sub valve chamber and the main valve chamber of the two sub valve chambers. In the four-way switching valve designed to switch,
Each piston has a packing that is slidably contacted with the inner periphery of the valve housing, and a conductive guide plate that presses the packing toward the upright side of the end portion of the coupling fitting, and the piston includes the guide plate And a conductive fixing screw that passes through the packing and is screwed to the upright plate, and is fixed to the coupling metal, or a contact portion between the fixing screw and the guide plate, or the fixing screw and the upright plate A four-way switching valve characterized in that the screwed portion is resistance-welded. 前記ピストンの同一ピストン側に２つの前記固定ねじを有し、前記固定ねじと前記ガイド板との当接箇所が前記抵抗溶接されている請求項１に記載の四方切換弁における固定ねじの溶接方法であって、前記同一ピストンにおける２つの固定ねじ間に溶接電流を通電して当該２つの固定ねじを抵抗溶接するようにしたことを特徴とする四方切換弁における固定ねじの溶接方法。   2. The method for welding a fixing screw in a four-way switching valve according to claim 1, wherein two fixing screws are provided on the same piston side of the piston, and a contact portion between the fixing screw and the guide plate is resistance-welded. A welding method for fixing screws in a four-way switching valve, wherein a welding current is passed between the two fixing screws in the same piston so that the two fixing screws are resistance-welded. 前記抵抗溶接の前に、前記固定ねじと前記ガイド板との当接箇所の、前記固定ねじまたは前記ガイド板の何れか一方に凸部を形成することを特徴とする請求項２に記載の四方切換弁における固定ねじの溶接方法。   The four-way according to claim 2, wherein a convex portion is formed on one of the fixing screw and the guide plate at a contact portion between the fixing screw and the guide plate before the resistance welding. A welding method for fixing screws in a switching valve. 前記固定ねじと前記立板との螺合部が前記抵抗溶接されている請求項１に記載の四方切換弁における固定ねじの溶接方法であって、前記２つのピストンにおける一方のピストン側の固定ねじと他方のピストン側の固定ねじとの間に溶接電流を通電して当該２つの固定ねじを抵抗溶接するようにしたことを特徴とする四方切換弁における固定ねじの溶接方法。   2. The method for welding a fixing screw in a four-way switching valve according to claim 1, wherein a threaded portion between the fixing screw and the upright plate is resistance-welded, and the fixing screw on one piston side of the two pistons A welding method for a fixing screw in a four-way switching valve, wherein a welding current is passed between the first fixing screw and the other fixing screw on the other piston side so that the two fixing screws are resistance-welded.
JP2013155374A 2013-07-26 2013-07-26 Fixing method of connecting fitting and piston in four-way switching valve and welding method of fixing screw in four-way switching valve Expired - Fee Related JP5916139B2 (en)

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