JP2010257866A - Pressure switch - Google Patents

Pressure switch Download PDF

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JP2010257866A
JP2010257866A JP2009108883A JP2009108883A JP2010257866A JP 2010257866 A JP2010257866 A JP 2010257866A JP 2009108883 A JP2009108883 A JP 2009108883A JP 2009108883 A JP2009108883 A JP 2009108883A JP 2010257866 A JP2010257866 A JP 2010257866A
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layer
cap member
joint
pressure switch
clad
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JP5291526B2 (en
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Hiroshi Shibata
浩 柴田
Takehide Motofuji
壮英 本藤
Kazuhiro Izumiya
和博 泉屋
Fumio Kanezaki
文雄 金崎
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Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To join a joint and a cap member reliably in a pressure switch in which a fluid is introduced from the joint into a pressure container constituted of the cap member, and fluid pressure is detected by a pressure detecting part to simplify a manufacturing process and reduce intermediate stocks in work-in-process. <P>SOLUTION: At the outer periphery of a pedestal part 11 of the joint 1 made of brass, a tapered face 11a is formed. A clad member 3 of a washer state is used where a first layer 31 made of the brass and a second layer 32 made of stainless steel are laminated. At the outer periphery of the first layer 31, the tapered face 31a is formed in advance. The clad member 3 is interposed between the pedestal part 11 and the cap member 21 made of the stainless steel. The first layer 31 and the pedestal part 11 are welded by a fiber laser at the whole circumference of a V-groove 7 constituted of the tapered faces 11a, 31a. The whole circumference of the outer periphery of the joining part of the second layer 32 and the cap member 21 is welded by the fiber laser. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、冷凍サイクルにおける冷媒等の流体の圧力の変化に応じて接点が開閉する圧力スイッチに関し、詳細には圧力検知部と継手との接続構造を改良した圧力スイッチに関する。   The present invention relates to a pressure switch whose contact opens and closes according to a change in pressure of a fluid such as a refrigerant in a refrigeration cycle, and more particularly to a pressure switch having an improved connection structure between a pressure detector and a joint.

従来、圧力スイッチとして例えば図６に示すものがある。この圧力スイッチは、検出対象の流体が流れる配管に接続される継手１０と、圧力検知部２０と、スイッチ部４と、カシメ板５と、ポリアミド樹脂のケース６とを有している。圧力検知部２０は、継手１０に接続されたキャップ部材２０ａと、キャップ部材２０ａと共に圧力容器を構成する円板２０ｂと、円板２０ｂの所定量以上の変形を規制するワッシャ状のストッパ２０ｃとで構成されている。   Conventional pressure switches include those shown in FIG. This pressure switch has a joint 10 connected to a pipe through which a fluid to be detected flows, a pressure detection unit 20, a switch unit 4, a crimping plate 5, and a case 6 of polyamide resin. The pressure detection unit 20 includes a cap member 20a connected to the joint 10, a disk 20b that forms a pressure vessel together with the cap member 20a, and a washer-like stopper 20c that restricts deformation of the disk 20b by a predetermined amount or more. It is configured.

スイッチ部４は、中央に軸孔４１ａが形成されたガイド４１と、ガイド４１の軸孔４１ａに嵌挿された軸４２と、ガイド４１の周囲に嵌合する円筒状の端子台４３とを有している。キャップ部材２０ａ、円板２０ｂ及びストッパ２０ｃの外周はカシメ板５により端子台４３の端部にカシメにより固着されている。端子台４３には、Ｃ端子４４とＬ端子４５が固定され、Ｃ端子４４には接点板４４ａが取り付けられている。そして、接点板４４ａにはＣ接点４４ｂが、Ｌ端子４５にはＬ接点４５ａが取り付けられている。また、端子台４３はケース６内に収納されている。   The switch unit 4 includes a guide 41 having a shaft hole 41 a formed at the center, a shaft 42 fitted into the shaft hole 41 a of the guide 41, and a cylindrical terminal block 43 fitted around the guide 41. is doing. The outer peripheries of the cap member 20a, the disk 20b, and the stopper 20c are fixed to the end of the terminal block 43 by caulking plates 5 by caulking. A C terminal 44 and an L terminal 45 are fixed to the terminal block 43, and a contact plate 44 a is attached to the C terminal 44. A C contact 44b is attached to the contact plate 44a, and an L contact 45a is attached to the L terminal 45. The terminal block 43 is accommodated in the case 6.

以上の構成により、継手１０の導入路１０ａを介して流体が、キャップ部材２０ａと円板２０ｂから構成される圧力容器内に導入され、流体の圧力に応じて円板２０ｂが変形して軸４２を押す。そして、圧力が予め設定された設定圧力になると、軸４２に連動してＣ接点４４ｂがＬ接点４５ａに接触してスイッチがＯＮとなる。これにより、流体の圧力が設定圧力に達したことを検知できる。   With the above configuration, the fluid is introduced into the pressure vessel constituted by the cap member 20a and the disc 20b through the introduction path 10a of the joint 10, and the disc 20b is deformed according to the pressure of the fluid, and the shaft 42 is deformed. Press. When the pressure reaches a preset pressure, the C contact 44b contacts the L contact 45a in conjunction with the shaft 42, and the switch is turned on. Thereby, it can be detected that the pressure of the fluid has reached the set pressure.

ここで、継手１０は黄銅製（真鍮製）、キャップ部材２０ａはステンレス製（ＳＵＳ製）であり、継手１０とキャップ部材２０ａとは、ろう付けにより接合されている。また、この従来の圧力スイッチと同様に、継手とキャップ部材とをろう付けにより接合するようにした圧力スイッチが、例えば特開２００２−５５０１２号公報に開示されている。   Here, the joint 10 is made of brass (made of brass), the cap member 20a is made of stainless steel (made of SUS), and the joint 10 and the cap member 20a are joined by brazing. Similarly to this conventional pressure switch, a pressure switch in which a joint and a cap member are joined by brazing is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-55012.

特開２００２−５５０１２号公報JP 2002-55012 A

前記従来の圧力スイッチの製造工程では、継手１０とキャップ部材２０ａとのろう付けを、バーナーろう付け及び炉中ろう付けにより行われている。このため、フラックスや焼けを落とすために、酸洗いを行う必要がある。酸洗いを行うことは環境保護や公害防止という観点から好ましくなかった。   In the manufacturing process of the conventional pressure switch, the joint 10 and the cap member 20a are brazed by burner brazing and in-furnace brazing. For this reason, it is necessary to perform pickling in order to remove flux and burn. Pickling is not preferable from the viewpoint of environmental protection and pollution prevention.

また、従来の圧力スイッチの製造に際しては、継手１０とキャップ部材２０ａとをろう付けにより接合した仕掛部品を作り、その後で、この仕掛部品に円板２０ｂとストッパ２０ｃとを組合わせてプラズマ溶接することにより、圧力検知部２０を製造する。そして、この圧力検知部２０をスイッチ部４と組み付けるようにしている。   Further, when manufacturing a conventional pressure switch, an in-process part is produced by joining the joint 10 and the cap member 20a by brazing, and thereafter, the in-process part is combined with a disk 20b and a stopper 20c and plasma-welded. Thus, the pressure detector 20 is manufactured. The pressure detection unit 20 is assembled with the switch unit 4.

このため、継手１０とキャップ部材２０ａとを接合した仕掛部品という中間在庫品があり、コスト的に問題がある。また、継手１０がキャップ部材２０ａに予め接合されてしまうので、仕様やタイプの異なる継手を用いる場合の自由度が低いという問題がある。   For this reason, there is an intermediate stock product called a work-in-process part in which the joint 10 and the cap member 20a are joined, which is problematic in terms of cost. Further, since the joint 10 is joined to the cap member 20a in advance, there is a problem that the degree of freedom when using joints with different specifications and types is low.

本発明は、流体を継手からキャップ部材で構成される圧力検知部に導入して、流体の圧力を検知する圧力スイッチにおいて、継手とキャップ部材を確実に接合するとともに、継手を後付けできるようにし、製造工程を簡略化して仕掛部品等の中間在庫品を減らすことを課題とする。   The present invention introduces a fluid from a joint to a pressure detection unit constituted by a cap member, and in a pressure switch for detecting the pressure of the fluid, the joint and the cap member are securely joined, and the joint can be retrofitted, It is an object to simplify the manufacturing process and reduce intermediate inventory such as work-in-progress parts.

請求項１の圧力スイッチは、圧力検知対象の流体が流れる配管に接続される金属製の継手と、該継手から流体が導入される金属製のキャップ部材を有する圧力検知部と、該圧力検知部に連動するスイッチ部とを備えた圧力スイッチにおいて、前記継手に、前記キャップ部材側に位置するとともに前記キャップ部材内に流体を導入する導入路を有する薄型円柱状の台座部が形成され、前記台座部と同径のワッシャ状のクラッド部材であって、前記継手と同じ金属材料の第１層と前記キャップ部材と同じ金属材料の第２層とを積層したクラッド部材を備え、前記クラッド部材が、第１層を前記台座部側に第２層を前記キャップ部材側にして、該台座部と該キャップ部材との間に介在され、少なくとも該台座部と第１層との接合部周縁の全周に凹部が形成され、前記第１層と前記台座部との全周の前記凹部にて該第１層と該台座部とが溶接により接合され、前記第２層と前記キャップ部材とが該第２層の全周にて溶接により接合されていることを特徴とする。   The pressure switch according to claim 1 includes a metal joint connected to a pipe through which a fluid to be pressure-detected flows, a pressure detector having a metal cap member into which fluid is introduced from the joint, and the pressure detector In the pressure switch including the switch unit interlocking with the thin-film columnar pedestal portion that is located on the cap member side and has an introduction path for introducing a fluid into the cap member is formed in the joint, and the pedestal A washer-like clad member having the same diameter as the part, comprising a clad member in which a first layer of the same metal material as the joint and a second layer of the same metal material as the cap member are laminated, the clad member comprising: The first layer is on the pedestal side and the second layer is on the cap member side, and is interposed between the pedestal and the cap member, and at least the entire circumference of the periphery of the joint between the pedestal and the first layer Recessed into Formed, the first layer and the pedestal portion are joined by welding in the concave portion of the entire circumference of the first layer and the pedestal portion, and the second layer and the cap member are bonded to the second layer. It is characterized by being joined by welding all around.

請求項２の圧力スイッチは、請求項１に記載の圧力スイッチであって、前記継手及び第１層が黄銅、前記キャップ部材及び第２層がステンレス材で構成されていることを特徴とする。   A pressure switch according to a second aspect is the pressure switch according to the first aspect, wherein the joint and the first layer are made of brass, and the cap member and the second layer are made of a stainless material.

請求項３の圧力スイッチは、請求項１または２に記載の圧力スイッチであって、前記第１層と前記台座部、前記第２層と前記キャップ部材が、それぞれファイバーレーザーにより溶接されていることを特徴とする。   The pressure switch according to claim 3 is the pressure switch according to claim 1 or 2, wherein the first layer and the pedestal, and the second layer and the cap member are respectively welded by a fiber laser. It is characterized by.

請求項４の圧力スイッチは、請求項２または３に記載の圧力スイッチであって、前記クラッド部材が、前記第１層をなす黄銅板と前記第２層をなすステンレス板とを接合したクラッド用板材を該黄銅側の外形と孔部にダレが発生するように打ち抜くことにより形成されたものであることを特徴とする。   The pressure switch according to claim 4 is the pressure switch according to claim 2 or 3, wherein the clad member joins the brass plate forming the first layer and the stainless steel plate forming the second layer. It is characterized by being formed by punching a plate material so that sagging occurs in the brass-side outer shape and hole.

請求項１の圧力スイッチによれば、クラッド部材の第１層と継手の台座部との間の凹部に対してファイバーレーザー等のビーム径の小さなレーザー光を照射することにより、金属光沢のある第１層及び台座部であってもレーザー光の照射方向と反対方向への反射を低減することができるので、ビーム径が小さく出力の小さなレーザー光でも第１層と台座部とを容易に溶接することができる。したがって、酸洗いの工程を必要としない。また、レーザー光の出力を小さく設定することにより、黄銅等の溶接時に生じる亜鉛の蒸発によるフュームの付着やボイドの発生を低減することができ、接合部分の仕上がりが良くなる。また、それと同時に、他部品への熱の影響を低減できるので、キャップ部材を有する圧力検知部を先に組み付けておき、このキャップ部材に対して後つけで継手を接合することができるので、継手とキャップ部材とを接合した仕掛部品という中間在庫品が不要となる。   According to the pressure switch of the first aspect, the laser beam having a small metallic diameter such as a fiber laser is irradiated to the concave portion between the first layer of the clad member and the pedestal portion of the joint, so that the first metallic gloss is obtained. Even in the case of a single layer and a pedestal, reflection in the direction opposite to the direction of laser light irradiation can be reduced, so that the first layer and the pedestal can be easily welded even with a laser beam having a small beam diameter and a small output. be able to. Therefore, the pickling process is not required. Further, by setting the output of the laser light small, it is possible to reduce fume adhesion and void generation due to the evaporation of zinc that occurs during welding of brass or the like, and the finish of the joined portion is improved. At the same time, since the influence of heat on other parts can be reduced, the pressure detection unit having the cap member can be assembled first, and the joint can be joined later to the cap member. An intermediate stock product called a work-in-process part in which the cap member and the cap member are joined is no longer necessary.

請求項２の圧力スイッチによれば、請求項１の効果に加えて、継手が黄銅で構成されているので、製造が容易にコストも低減できる。   According to the pressure switch of the second aspect, in addition to the effect of the first aspect, since the joint is made of brass, the manufacturing can be easily performed and the cost can be reduced.

請求項３の圧力スイッチによれば、請求項１または２の効果に加えて、溶接時にビーム径の小さなレーザー光を容易に得ることができるので、小型化に対応できる。   According to the pressure switch of the third aspect, in addition to the effect of the first or second aspect, it is possible to easily obtain a laser beam having a small beam diameter at the time of welding.

請求項４の圧力スイッチによれば、請求項１または２または３の効果に加えて、クラッド用板材を打ち抜くとき、黄銅側の外形と孔部にダレが発生するように打ち抜くことにより、可塑性の高い黄銅側が先に切断されてから弾性の高いステンレス側が切断されるので、クラッド用板材の黄銅とステンレスとの接合部分での剥がれ等が生じないので、このクラッド用板材の厚みすなわちクラッド部材の厚みを薄くすることででき、圧力スイッチを小型化することができる。   According to the pressure switch of claim 4, in addition to the effect of claim 1, 2 or 3, when punching the clad plate material, by punching so that the outer shape and the hole on the brass side are sagged, Since the high-elasticity stainless steel side is cut after the high brass side is cut first, no peeling occurs at the joint between the brass and stainless steel of the clad plate, so the thickness of the clad plate, ie the thickness of the clad member The pressure switch can be reduced in size.

本発明の実施形態の圧力スイッチの縦断面図である。It is a longitudinal cross-sectional view of the pressure switch of embodiment of this invention. 同圧力スイッチの要部拡大図である。It is a principal part enlarged view of the same pressure switch. 実施形態における溶接箇所を説明する図である。It is a figure explaining the welding location in embodiment. 実施形態におけるクラッド部材の打ち抜きの方向を説明する図である。It is a figure explaining the direction of punching of the clad member in an embodiment. 実施形態におけるキャップ部材とクラッド部材の他の溶接例を説明する図である。It is a figure explaining the other welding example of the cap member and clad member in embodiment. 従来の圧力スイッチの一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the conventional pressure switch.

次に、本発明の圧力スイッチの実施の形態を図面を参照して説明する。図１は第１実施形態の圧力スイッチの縦断面図、図２は同圧力スイッチの要部拡大図であり、図２の左半分は縦断面を示し、右半分は外観側面を示している。なお、前掲の図６と同様な要素及び対応する要素には同符号を付記して重複する詳細な説明は省略する。   Next, an embodiment of a pressure switch of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of the pressure switch of the first embodiment, FIG. 2 is an enlarged view of a main part of the pressure switch, the left half of FIG. 2 shows a longitudinal section, and the right half shows an external side view. It should be noted that the same elements as those in FIG. 6 described above and the corresponding elements are denoted by the same reference numerals, and detailed description thereof is omitted.

この実施形態の圧力スイッチでは、継手１と圧力検知部２のキャップ部材２１との間にクラッド部材３が介在されている。圧力検知部２、キャップ部材２１、円板２２及びストッパ２３は、図６における圧力検知部２０、キャップ部材２０ａ、円板２０ｂ及びストッパ２０ｃと構造及び作用は同じであるが、ステンレス製（ＳＵＳ製）のキャップ部材２１がクラッド部材３に対してレーザーにより溶接されている点が異なる。なお、キャップ部材２１の中心には接続孔２１ａが形成されている。   In the pressure switch of this embodiment, the clad member 3 is interposed between the joint 1 and the cap member 21 of the pressure detector 2. The pressure detector 2, the cap member 21, the disk 22 and the stopper 23 have the same structure and function as the pressure detector 20, the cap member 20a, the disk 20b and the stopper 20c in FIG. ) Is welded to the clad member 3 by a laser. A connection hole 21 a is formed at the center of the cap member 21.

継手１は黄銅製（真鍮製）であり、キャップ部材２１側に位置するように薄型円柱状の台座部１１が形成され、さらにこの台座部１１には、前記キャップ部材２１の接続孔２１ａに嵌合するように台座部１１より径の小さな薄型円柱状のボス部１２が形成されている。そして、この台座部１１とボス部１２を貫通するように、キャップ部材２１内に流体を導入する導入路１ａが形成されている。また、この継手１には導入路１ａに連通するとともに図示しない配管に接続するための雌ネジ部１ｂが形成されている。さらに、台座部１１の外周の端部にはテーパ面１１ａが全周に亘って形成されている。   The joint 1 is made of brass (made of brass), and a thin cylindrical pedestal portion 11 is formed so as to be positioned on the cap member 21 side. Further, the pedestal portion 11 is fitted into the connection hole 21 a of the cap member 21. A thin cylindrical boss portion 12 having a smaller diameter than the pedestal portion 11 is formed so as to match. An introduction path 1 a for introducing a fluid into the cap member 21 is formed so as to penetrate the pedestal portion 11 and the boss portion 12. The joint 1 is formed with a female screw portion 1b that communicates with the introduction path 1a and is connected to a pipe (not shown). Furthermore, the taper surface 11a is formed in the outer peripheral edge part of the base part 11 over the perimeter.

クラッド部材３は、継手１の台座部１１と同径のワッシャ状の形状をしており、中心に前記継手１のボス部１２に嵌合する抜き孔３ａが形成されている。このクラッド部材３は、継手１と同じ黄銅製の第１層３１とキャップ部材２１と同じステンレス製の第２層３２とを積層したものである。第１層３１と第２層３２はその境界部分で金属原子が互いに拡散した状態で接合されたものである。   The clad member 3 has a washer-like shape with the same diameter as the pedestal portion 11 of the joint 1, and a hole 3 a that fits the boss portion 12 of the joint 1 is formed at the center. The clad member 3 is formed by laminating the same first brass layer 31 as the joint 1 and the same second stainless steel layer 32 as the cap member 21. The first layer 31 and the second layer 32 are joined in a state where metal atoms diffuse to each other at the boundary portion.

そして、クラッド部材３の抜き孔３ａが継手１のボス部１２に嵌合されるとともに、このボス部１２がキャップ部材２１の接続孔２１ａに嵌合されている。これにより、クラッド部材３は、第１層３１を台座部１１側にし、第２層３２をキャップ部材２１側にし、この台座部１１とキャップ部材２１との間に介在されている。   The opening 3 a of the cladding member 3 is fitted into the boss 12 of the joint 1, and the boss 12 is fitted into the connection hole 21 a of the cap member 21. Thus, the clad member 3 is interposed between the pedestal 11 and the cap member 21 with the first layer 31 on the pedestal 11 side and the second layer 32 on the cap member 21 side.

また、クラッド部材３の第１層３１の外周端部には、テーパ面３１ａが全周に亘って形成されている。この第１層３１のテーパ面３１ａは台座部１１のテーパ面１１ａと共にＶ溝７を構成している。このＶ溝７は、台座部１１及び第１層３１の中心方向に窪んだ凹部をなし、台座部１１と第１層３１の接合部の全周に形成されている。そして、図３に示すように、このＶ溝７の箇所で、台座部１１と第１層３１とが全周に亘ってレーザーにより溶接され、第２層３２とキャップ部材２１との境界部分で全周に亘ってレーザーにより溶接されている。すなわち、台座部１１と第１層３１の黄銅同士の溶接を行い、キャップ部材２１と第２層３２とのステンレス同士の溶接を行う。これにより、継手１がクラッド部材３を介してキャップ部材２１に固着され、継手１、キャップ部材２１及び円板２２による圧力容器の気密性が保たれる。   Further, a tapered surface 31 a is formed over the entire circumference at the outer peripheral end of the first layer 31 of the cladding member 3. The tapered surface 31 a of the first layer 31 constitutes the V groove 7 together with the tapered surface 11 a of the pedestal portion 11. The V-groove 7 forms a recess that is recessed in the center direction of the pedestal 11 and the first layer 31, and is formed on the entire circumference of the joint between the pedestal 11 and the first layer 31. As shown in FIG. 3, the pedestal 11 and the first layer 31 are welded by laser over the entire circumference at the V groove 7, and at the boundary between the second layer 32 and the cap member 21. The entire circumference is welded by laser. That is, the brass of the base part 11 and the first layer 31 is welded, and the stainless steel of the cap member 21 and the second layer 32 is welded. Thereby, the joint 1 is fixed to the cap member 21 via the clad member 3, and the airtightness of the pressure vessel by the joint 1, the cap member 21 and the disc 22 is maintained.

この実施形態の圧力スイッチの製造工程の一例は次のとおりである。まず、キャップ部材２１、円板２２及びストッパ２３を組み付けて、これらの周囲をプラズマ溶接し、圧力検知部２を形成する。この圧力検知部２をＯリング８を介してスイッチ部４に当て付け、カシメ板５により端子台４３の端部（スイッチ部４）にカシメにより固着する。そして、その後、キャップ部材２１に対して、クラッド部材３を介して継手１を前記のように溶接し、固着する。   An example of the manufacturing process of the pressure switch of this embodiment is as follows. First, the cap member 21, the disk 22, and the stopper 23 are assembled, and the surroundings are plasma-welded to form the pressure detection unit 2. The pressure detection unit 2 is applied to the switch unit 4 via the O-ring 8 and is fixed to the end portion (switch unit 4) of the terminal block 43 by the crimping plate 5 by crimping. Then, the joint 1 is welded and fixed to the cap member 21 through the clad member 3 as described above.

また、他の製造工程の例としては、次のとおりである。まず、キャップ部材２１、円板２２及びストッパ２３を組み付けて、これらの周囲をプラズマ溶接し、圧力検知部２を形成する。この圧力検知部２のキャップ部材２１に対して、クラッド部材３を介して継手１を前記のように溶接し、固着する。その後、この圧力検知部２をＯリング８を介してスイッチ部４に当て付け、カシメ板５により端子台４３の端部（スイッチ部４）にカシメにより固着する。   Moreover, as an example of another manufacturing process, it is as follows. First, the cap member 21, the disk 22, and the stopper 23 are assembled, and the surroundings are plasma-welded to form the pressure detection unit 2. The joint 1 is welded and fixed to the cap member 21 of the pressure detection unit 2 through the clad member 3 as described above. Thereafter, the pressure detection unit 2 is applied to the switch unit 4 via the O-ring 8 and is fixed to the end portion (switch unit 4) of the terminal block 43 by the crimping plate 5 by crimping.

レーザーによる溶接はＹｂ（イッテリビウム）ファイバーレーザー溶接により行う。ファイバーレーザーはビーム径の小さなレーザービームを得ることができ、例えばビーム径を０．２ミリ程度にすることができる。これにより、クラッド部材３の半径方向に深く鋭く溶接され、第１層３１と第２層３２の界面を超えることなく、かつ、溶接幅を厚くすることなく溶接することができる。   Laser welding is performed by Yb (ytterbium) fiber laser welding. The fiber laser can obtain a laser beam having a small beam diameter, and for example, the beam diameter can be reduced to about 0.2 mm. Thus, the clad member 3 is welded deeply and sharply in the radial direction, and can be welded without exceeding the interface between the first layer 31 and the second layer 32 and without increasing the weld width.

クラッド部材３の第１層３１と継手１の台座部１１との間のＶ溝７に対してビーム径の小さなレーザー光を照射すると、金属光沢のある黄銅でも、レーザー光の照射方向と反対方向への反射を低減することができるので、レーザー光のエネルギーを十分吸収させることができ、容易に溶接することができる。   When laser light with a small beam diameter is irradiated to the V groove 7 between the first layer 31 of the clad member 3 and the pedestal portion 11 of the joint 1, even in brass with metallic luster, the direction opposite to the laser light irradiation direction Therefore, the energy of the laser beam can be sufficiently absorbed and welding can be easily performed.

図４はクラッド部材３の打ち抜きの方向を説明する図である。図４(A) はクラッド部材３の外形を形成する工程を説明した図である。前記第１層となる黄銅板３１′とステンレス板３２′とを接合したクラッド用板材３′に対して、黄銅側の外形にダレが発生するようにステンレス板３２′側から図の矢印のように打ち抜き型（パンチ）Ａにより打ち抜く。これにより、黄銅板３１′が第１層３１″となりステンレス板３２′が第２層３２″となるクラッド部材３″を形成する。なお、テーパ面３１ａは通常はこの打ち抜きとは別の加工工程で形成される。図４(B) は、外形が形成されたクラッド部材３″をワッシャ状にするために孔をあける工程を説明した図である。この工程においても、クラッド部材に形成された孔の断面において、黄銅側の孔の角部にダレが発生するように打ち抜くとよい。このように打ち抜くことにより、可塑性の高い黄銅板３１′が先に切断されてから弾性の高いステンレス板３２′が切断されるので、この黄銅板３１′とステンレス板３２′との接合部分での剥がれ等が生じずに、クラッド部材３を形成することができる。したがって、クラッド用板材３′の厚みを薄くし、クラッド部材３の厚みを薄くすることできる。これにより、圧力スイッチを小型化することができる。以上のようにクラッド部材３の外形加工と孔加工とを別の打ち抜き工程で行う例を説明したが、外形加工と孔加工を１回の工程で行う方法として、いわゆるコンパウンド加工も可能である。   FIG. 4 is a view for explaining the direction of punching of the clad member 3. FIG. 4A is a diagram illustrating a process of forming the outer shape of the clad member 3. As shown by the arrows in the figure from the stainless steel plate 32 'side, the brass plate 31' and the stainless steel plate 32 ', which are the first layer, are joined to the clad plate material 3' so that the outer shape on the brass side is sag. Punching is performed with a punching die (punch) A. As a result, a clad member 3 ″ is formed in which the brass plate 31 ′ becomes the first layer 31 ″ and the stainless steel plate 32 ′ becomes the second layer 32 ″. The tapered surface 31a is usually a different processing step from this punching. 4B is a diagram illustrating a process of making a hole in order to make the clad member 3 ″ having the outer shape into a washer shape. Also in this step, it is preferable to punch out so that sagging occurs at the corner of the hole on the brass side in the cross section of the hole formed in the clad member. By punching in this way, the highly elastic brass plate 31 'is cut first, and then the highly elastic stainless plate 32' is cut. Therefore, at the joined portion of the brass plate 31 'and the stainless plate 32', The clad member 3 can be formed without peeling or the like. Therefore, the thickness of the clad plate 3 'can be reduced and the thickness of the clad member 3 can be reduced. Thereby, a pressure switch can be reduced in size. As described above, the example in which the outer shape processing and the hole processing of the clad member 3 are performed in different punching processes has been described. However, as a method of performing the outer shape processing and the hole processing in one step, so-called compound processing is also possible.

レーザー溶接時には、シールドガス内で、図１に示す軸Ｌを回転軸としてワーク（組み付け品）を回転しながらレーザービームを照射する。このレーザービームの出力と回転速度は適宜選定すればよい。例えば、黄銅を溶接する際に発生する亜鉛の蒸気の発生を抑えるために、レーザービームの出力を抑えるようにするとよい。また、ワークの溶接スピード（回転速度）は、接合部分への溶け込みが確実となる程度に設定するとよい。   At the time of laser welding, a laser beam is irradiated in the shielding gas while rotating the workpiece (assembled product) with the axis L shown in FIG. 1 as the rotation axis. What is necessary is just to select suitably the output and rotational speed of this laser beam. For example, in order to suppress the generation of zinc vapor generated when welding brass, the output of the laser beam may be suppressed. Moreover, it is good to set the welding speed (rotation speed) of a workpiece | work to such an extent that the melt | dissolution to a junction part is ensured.

以上の実施形態では、キャップ部材２１とクラッド部材３の第２層３２との径が異なる場合について説明したが、例えば図５のように、キャップ部材２１にクラッド部材３と同径のリング状の台座部２１ｂを形成し、この台座部２１ｂと第２層３２との境界部分でレーザー溶接してもよい。   In the above embodiment, the case where the cap member 21 and the second layer 32 of the clad member 3 have different diameters has been described. For example, as shown in FIG. 5, the cap member 21 has a ring shape having the same diameter as the clad member 3. A pedestal portion 21 b may be formed, and laser welding may be performed at a boundary portion between the pedestal portion 21 b and the second layer 32.

なお、使用するレーザー光の波長は1μmであり、このときの金属の反射率は電気伝導率によるが、黄銅よりも反射率が高い金属として、例えば銀、銅、金、アルミニウムなどがある。従って、継手１の金属材料として、特に銅、アルミニウム等を用いる場合にも本発明を適用できる。   The wavelength of the laser beam used is 1 μm, and the reflectivity of the metal at this time depends on the electrical conductivity, but examples of metals having higher reflectivity than brass include silver, copper, gold, and aluminum. Therefore, the present invention can also be applied to the case where copper, aluminum or the like is used as the metal material of the joint 1.

以上のように、ファイバーレーザー溶接により継手１とキャップ部材２１を固着しているので、酸洗いの工程を必要としない。また、レーザー光の出力を小さく設定することにより、黄銅の溶接時に生じる亜鉛の蒸発によるフュームの付着やボイドの発生を低減することができ、接合部分の仕上がりが良くなる。また、キャップ部材２１を有する圧力検知部２を先に組み付けておき、このキャップ部材２１に対して後つけで継手１を接合しているので、継手１とキャップ部材２１とを接合した仕掛部品という中間在庫品が不要となる。   As described above, since the joint 1 and the cap member 21 are fixed by fiber laser welding, a pickling process is not required. Further, by setting the output of the laser light small, it is possible to reduce fume adhesion and void generation due to the evaporation of zinc that occurs during the welding of brass, and the finished joint portion is improved. Moreover, since the pressure detection part 2 which has the cap member 21 is assembled | attached first, and the joint 1 is joined to this cap member 21 by retrofitting, it is called the in-process component which joined the joint 1 and the cap member 21. Intermediate inventory is not required.

なお、実施形態では凹部をＶ溝７として形成しているが、この凹部はある程度の深さがあれば断面Ｕ字状、断面コ字状の溝でもよい。   In the embodiment, the concave portion is formed as the V-groove 7, but the concave portion may be a groove having a U-shaped cross section or a U-shaped cross section as long as it has a certain depth.

また、実施形態における継手１は導通路１ａに通じる雌ネジ１ｂに対して配管をねじ込むタイプ（フレアタイプ）であるが、導通路１ａに通じる孔を有し、その回りに雄ネジ部を形成して配管を外側にねじ込むタイプのものでもよい。このように継手１として別のタイプのものを製造するときでも、継手１を後付けできるので、圧力検知部２及びスイッチ部４は予め調整済みのものとすることができ、製造時の自由度が高くなる。   Further, the joint 1 in the embodiment is a type (flare type) in which a pipe is screwed into a female screw 1b that communicates with the conduction path 1a, but has a hole that communicates with the conduction path 1a, and a male thread portion is formed around the hole. It is also possible to use a type in which the pipe is screwed outward. As described above, even when another type of joint 1 is manufactured, the joint 1 can be retrofitted, so that the pressure detection unit 2 and the switch unit 4 can be adjusted in advance, and the degree of freedom in manufacturing can be increased. Get higher.

１ 継手
２ 圧力検知部
３ クラッド部材
４ スイッチ部
７ Ｖ溝（凹部）
１ａ 導入路
１１ 台座部
１１ａ テーパ面
１２ ボス部
２１ キャップ部材
２２ 円板
２３ ストッパ
３１ 第１層
３１ａ テーパ面
３２ 第２層 DESCRIPTION OF SYMBOLS 1 Joint 2 Pressure detection part 3 Clad member 4 Switch part 7 V groove (recessed part)
DESCRIPTION OF SYMBOLS 1a Introduction path 11 Base part 11a Tapered surface 12 Boss part 21 Cap member 22 Disc 23 Stopper 31 1st layer 31a Tapered surface 32 2nd layer

Claims (4)

圧力検知対象の流体が流れる配管に接続される金属製の継手と、該継手から流体が導入される金属製のキャップ部材を有する圧力検知部と、該圧力検知部に連動するスイッチ部とを備えた圧力スイッチにおいて、
前記継手に、前記キャップ部材側に位置するとともに前記キャップ部材内に流体を導入する導入路を有する薄型円柱状の台座部が形成され、
前記台座部と同径のワッシャ状のクラッド部材であって、前記継手と同じ金属材料の第１層と前記キャップ部材と同じ金属材料の第２層とを積層したクラッド部材を備え、
前記クラッド部材が、第１層を前記台座部側に第２層を前記キャップ部材側にして、該台座部と該キャップ部材との間に介在され、
少なくとも該台座部と第１層との接合部周縁の全周に凹部が形成され、
前記第１層と前記台座部との全周の前記凹部にて該第１層と該台座部とが溶接により接合され、前記第２層と前記キャップ部材とが該第２層の全周にて溶接により接合されていることを特徴とする圧力スイッチ。 A metal joint connected to a pipe through which a fluid subject to pressure detection flows, a pressure detection unit having a metal cap member into which fluid is introduced from the joint, and a switch unit interlocking with the pressure detection unit Pressure switch
The joint is formed with a thin cylindrical pedestal portion that is located on the cap member side and has an introduction path for introducing fluid into the cap member,
A washer-like clad member having the same diameter as the pedestal portion, comprising a clad member in which a first layer of the same metal material as the joint and a second layer of the same metal material as the cap member are laminated,
The clad member is interposed between the pedestal portion and the cap member with the first layer on the pedestal portion side and the second layer on the cap member side,
A recess is formed at least around the periphery of the joint between the pedestal and the first layer,
The first layer and the pedestal portion are joined by welding at the recesses on the entire circumference of the first layer and the pedestal portion, and the second layer and the cap member are disposed on the entire circumference of the second layer. A pressure switch characterized by being joined by welding. 前記継手及び第１層が黄銅、前記キャップ部材及び第２層がステンレス材で構成されていることを特徴とする請求項１に記載の圧力スイッチ。   The pressure switch according to claim 1, wherein the joint and the first layer are made of brass, and the cap member and the second layer are made of stainless steel. 前記第１層と前記台座部、前記第２層と前記キャップ部材が、それぞれファイバーレーザーにより溶接されていることを特徴とする請求項１または２に記載の圧力スイッチ。   The pressure switch according to claim 1 or 2, wherein the first layer and the pedestal portion, the second layer and the cap member are welded by a fiber laser, respectively. 前記クラッド部材が、前記第１層となる黄銅板と前記第２層となるステンレス板とを接合したクラッド用板材を該黄銅側の外形と孔部にダレが発生するように打ち抜くことにより形成されたものであることを特徴とする請求項２または３に記載の圧力スイッチ。   The clad member is formed by punching a clad plate material obtained by joining a brass plate serving as the first layer and a stainless steel plate serving as the second layer so that sagging occurs in the outer shape and hole portion on the brass side. The pressure switch according to claim 2, wherein the pressure switch is a switch.
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