JP2020130238A - Welding structure of endoscope conduit - Google Patents
Welding structure of endoscope conduit Download PDFInfo
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- JP2020130238A JP2020130238A JP2019023878A JP2019023878A JP2020130238A JP 2020130238 A JP2020130238 A JP 2020130238A JP 2019023878 A JP2019023878 A JP 2019023878A JP 2019023878 A JP2019023878 A JP 2019023878A JP 2020130238 A JP2020130238 A JP 2020130238A
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- 238000003466 welding Methods 0.000 title abstract description 33
- 238000003780 insertion Methods 0.000 claims abstract description 19
- 230000037431 insertion Effects 0.000 claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 230000001678 irradiating effect Effects 0.000 claims 1
- 230000035515 penetration Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 23
- 238000012986 modification Methods 0.000 description 23
- 230000004048 modification Effects 0.000 description 23
- 239000011324 bead Substances 0.000 description 16
- 238000012545 processing Methods 0.000 description 8
- 238000007796 conventional method Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001574 biopsy Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、管同士を裏波溶接した内視鏡管路の溶接構造に関する。 The present invention relates to a welded structure of an endoscopic conduit in which tubes are back wave welded to each other.
従来、内視鏡では、二つの管路を繋ぎ合わせることによって処置具等を挿通する管路を形成している（例えば、特許文献１を参照）。二つの管は、一方の管を他方の管に挿入した後、重なり合っている部分を溶接することによって接続される。特許文献１では、内周面に形成される段差に処置具が引っかかることを防止するため、管路の接続部分の内周面まで溶接（裏波溶接）している。 Conventionally, in an endoscope, a pipe line through which a treatment tool or the like is inserted is formed by connecting two pipe lines (see, for example, Patent Document 1). The two tubes are connected by inserting one tube into the other and then welding the overlapping portions. In Patent Document 1, in order to prevent the treatment tool from being caught on the step formed on the inner peripheral surface, welding (back wave welding) is performed up to the inner peripheral surface of the connecting portion of the pipeline.
図１１は、従来の管路の形成方法を説明するための図（その１）である。図１２は、従来の管路の接続方法を説明するための図（その２）である。まず、第１管２００に第２管２０１を挿入する。この際、第１管路２００と第２管路２０１とは、領域Ｒ200において重なり合う（図１１参照）。 FIG. 11 is a diagram (No. 1) for explaining a conventional method of forming a pipeline. FIG. 12 is a diagram (No. 2) for explaining a conventional method of connecting pipelines. First, the second pipe 201 is inserted into the first pipe 200. At this time, the first pipeline 200 and the second pipeline 201 overlap each other in the region R 200 (see FIG. 11).
その後、第１管路２００および第２管路２０１の外周側から、レーザ光Ｌ200（図１１参照）を照射して、溶接する。溶接後、第１管路２００と第２管路２０１とを接続する溶接部２０３が形成される。この際、第１管路２００と第２管路２０１とは、各々の端部が溶融される隅肉溶接がなされる。隅肉溶接では、端部の溶融物同士が混ざり合い、その後固化する。この際、第１管路２００と第２管路２０１との間に隙間Ｓ200があると、溶融物がその隙間に広がるため、溶接部にえぐれ２０４が生じる（図１２参照）。えぐれ２０４は、溶接部２０３の薄肉化を招き、接合強度の低下の原因となる。 Then, the laser beam L 200 (see FIG. 11) is irradiated from the outer peripheral side of the first pipe line 200 and the second pipe line 201 to perform welding. After welding, a welded portion 203 connecting the first pipe line 200 and the second pipe line 201 is formed. At this time, the first pipe line 200 and the second pipe line 201 are fillet welded so that their respective ends are melted. In fillet welding, the melts at the ends are mixed and then solidified. At this time, if there is a gap S 200 between the first pipe line 200 and the second pipe line 201, the melt spreads in the gap, so that a gouge 204 is formed in the welded portion (see FIG. 12). The gouge 204 causes the welded portion 203 to be thinned, which causes a decrease in joint strength.
本発明は、上記に鑑みてなされたものであって、接合強度が低下することなく裏波溶接された管路同士の接合構造を得ることができる内視鏡管路の溶接構造を提供することを目的とする。 INDUSTRIAL APPLICABILITY The present invention has been made in view of the above, and provides a welded structure of an endoscopic pipeline capable of obtaining a joint structure between pipelines welded by back waves without lowering the joint strength. With the goal.
上述した課題を解決し、目的を達成するために、本発明に係る内視鏡管路の溶接構造は、第一の管路の一端に第二の管路の一部を挿入し、該挿入部分を溶接して連通管路を形成する内視鏡管路の溶接構造において、前記第一の管路は、前記第二の管路に連なって前記連通管路の一部を形成する小径部と、前記小径部の間口から当該第一の管路の中心軸方向に延設し、内径が前記小径部の内径よりも大きい大径部と、前記大径部の間口と反対側の端部に形成される段部とを有し、前記第二の管路は、前記第一の管路の一端に挿入され、外径が前記大径部の内径よりも小さい管路接続部であって、当該第二の管路の中心軸方向における長さが前記第一の管路への挿入長よりも長い管路接続部を有し、前記段部と前記管路接続部とが対向する対向領域を含み、かつ前記大径部の開口側の端部が非含有の領域であって、前記第一の管路の周方向の全周に亘る領域にレーザ光を照射して、前記第一の管路の外表面から前記第一の管路の厚さ方向に前記第二の管路の内周面まで裏波溶接された溶接部が形成されることを特徴とする。 In order to solve the above-mentioned problems and achieve the object, the welded structure of the endoscopic pipeline according to the present invention has a part of the second pipeline inserted into one end of the first pipeline. In the welded structure of an endoscopic pipe line in which a portion is welded to form a communication line, the first line is connected to the second line and a small diameter portion forming a part of the communication line. A large-diameter portion extending from the frontage of the small-diameter portion in the direction of the central axis of the first pipeline and having an inner diameter larger than the inner diameter of the small-diameter portion, and an end portion opposite to the frontage of the large-diameter portion. The second pipeline is a pipeline connection portion that is inserted into one end of the first pipeline and whose outer diameter is smaller than the inner diameter of the large diameter portion. A pipe connecting portion whose length in the central axis direction of the second pipeline is longer than the insertion length into the first pipeline, and the step portion and the pipeline connecting portion face each other. A region including a region and the end portion on the opening side of the large-diameter portion is a non-containing region, and a region extending over the entire circumference in the circumferential direction of the first pipeline is irradiated with laser light to obtain the first It is characterized in that a welded portion is formed by back wave welding from the outer surface of the first pipe line to the inner peripheral surface of the second pipe line in the thickness direction of the first pipe line.
本発明に係る内視鏡管路の溶接構造は、上記発明において、前記大径部と前記管路接続部との間には、隙間が形成されることを特徴とする。 The welded structure of the endoscopic pipeline according to the present invention is characterized in that, in the above invention, a gap is formed between the large diameter portion and the pipeline connecting portion.
本発明によれば、接合強度が低下することなく裏波溶接された管路同士の接合構造を得ることができるという効果を奏する。 According to the present invention, there is an effect that a joint structure between pipelines welded by back wave can be obtained without lowering the joint strength.
以下、本発明を実施するための形態（以下、「実施の形態」という）を添付図面に基づいて詳細に説明する。なお、図面は模式的なものであり、各部の寸法の関係や比率は、現実と異なる。また、図面の相互間においても、互いの寸法の関係や比率が異なる部分が含まれる。 Hereinafter, embodiments for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The drawings are schematic, and the relationships and ratios of the dimensions of each part are different from the actual ones. Further, even between the drawings, there are parts in which the relationship and ratio of the dimensions are different from each other.
（実施の形態）
図１は、本発明の一実施の形態にかかる内視鏡システムの概略構成を示す図である。図１に示す内視鏡システム１は、被検体内に先端部を挿入することによって被検体内の画像を撮像する内視鏡２と、内視鏡２の先端から出射する照明光を発生する照明部（図示せず）を有し、内視鏡２が撮像した撮像信号に所定の信号処理を施すとともに、内視鏡システム１全体の動作を統括的に制御する処理装置３と、処理装置３の信号処理により生成された体内画像を表示する表示装置４と、を備える。
(Embodiment)
FIG. 1 is a diagram showing a schematic configuration of an endoscope system according to an embodiment of the present invention. The endoscope system 1 shown in FIG. 1 generates an endoscope 2 that captures an image in the subject by inserting the tip portion into the subject, and an illumination light emitted from the tip of the endoscope 2. A processing device 3 and a processing device that have an illumination unit (not shown), perform predetermined signal processing on the image pickup signal captured by the endoscope 2, and collectively control the operation of the entire endoscope system 1. A display device 4 for displaying an in-vivo image generated by the signal processing of 3 is provided.
内視鏡２は、可撓性を有する細長形状をなす挿入部２１と、挿入部２１の基端側に接続され、各種の操作信号の入力を受け付ける操作部２２と、操作部２２から挿入部２１が延びる方向と異なる方向に延び、処理装置３（照明部を含む）に接続する各種ケーブルを内蔵するユニバーサルコード２３と、を備える。 The endoscope 2 has a flexible and elongated insertion portion 21, an operation portion 22 connected to the base end side of the insertion portion 21 and receiving input of various operation signals, and an insertion portion from the operation unit 22. It includes a universal cord 23 that extends in a direction different from the extending direction of 21 and incorporates various cables that connect to the processing device 3 (including the lighting unit).
挿入部２１は、光を受光して光電変換することにより信号を生成する画素が２次元状に配列された撮像素子を内蔵した先端部２４と、複数の節輪によって構成された湾曲自在な湾曲部２５と、湾曲部２５の基端側に接続され、可撓性を有する長尺状の可撓管部２６と、を有する。挿入部２１は、被検体の体腔内に挿入され、外光の届かない位置にある生体組織などの被写体を撮像素子によって撮像する。 The insertion portion 21 has a tip portion 24 having a built-in image pickup element in which pixels that generate a signal by receiving light and performing photoelectric conversion are arranged in a two-dimensional manner, and a bendable curvature composed of a plurality of nodes. It has a portion 25 and a long flexible tube portion 26 connected to the proximal end side of the curved portion 25 and having flexibility. The insertion unit 21 is inserted into the body cavity of the subject and images a subject such as a living tissue at a position where outside light does not reach by the image sensor.
操作部２２は、湾曲部２５を上下方向および左右方向に湾曲させる湾曲ノブ２２１と、被検体の体腔内に生検鉗子、電気メスおよび検査プローブ等の処置具を挿入する処置具挿入部２２２と、処理装置３に加えて、送気手段、送水手段、画面表示制御等の周辺機器の操作指示信号を入力する操作入力部である複数のスイッチ２２３と、を有する。処置具挿入部２２２から挿入される処置具は、先端部２４の処置具チャンネル（図示せず）を経由して開口部（図示せず）から表出する。 The operation unit 22 includes a bending knob 221 that bends the bending part 25 in the vertical and horizontal directions, and a treatment tool insertion part 222 that inserts a treatment tool such as a biopsy forceps, an electric knife, and an inspection probe into the body cavity of the subject. In addition to the processing device 3, a plurality of switches 223, which are operation input units for inputting operation instruction signals of peripheral devices such as an air supply means, a water supply means, and screen display control, are provided. The treatment tool inserted from the treatment tool insertion portion 222 is exposed from the opening (not shown) via the treatment tool channel (not shown) of the tip portion 24.
ユニバーサルコード２３は、ライトガイドと、複数の信号線をまとめた集合ケーブルとを少なくとも内蔵している。集合ケーブルは、撮像信号を伝送するための信号線や、撮像素子を駆動するための駆動信号を伝送するための信号線、内視鏡２（撮像素子）に関する固有情報などを含む情報を送受信するための信号線を含む。 The universal cord 23 includes at least a light guide and a collective cable in which a plurality of signal lines are grouped. The collective cable transmits / receives information including a signal line for transmitting an image pickup signal, a signal line for transmitting a drive signal for driving the image pickup element, and unique information about the endoscope 2 (image sensor). Includes signal lines for.
続いて、挿入部２１と操作部２２との接続部分について、図２および図３を参照して説明する。図２は、図１に示す内視鏡の要部の内部構造を説明する図である。図３は、図２に示す内部構造の断面を示す図であって、第１接続管路２７と第２接続管路２８との接合前の状態を示す図である。図２、３に示す内部構造は、処置具挿入部２２２を含むその近傍の構造を示している。具体的に、図２、３に示す内部構造は、第１接続管路２７と、第２接続管路２８とを備える。また、製品を識別するための機器固有識別子（ＵＤＩ）１００が付与されている。ＵＤＩ１００は、レーザ加工によって接続管路２７の本体に形成される。第１接続管路２７および第２接続管路２８は、ステンレス鋼（例えばＳＵＳ３０４）を用いて形成される。
なお、本実施の形態において、第１接続管路２７は第一の管路に相当し、第２接続管路２８は第二の管路に相当する。
Subsequently, the connection portion between the insertion portion 21 and the operation portion 22 will be described with reference to FIGS. 2 and 3. FIG. 2 is a diagram illustrating an internal structure of a main part of the endoscope shown in FIG. FIG. 3 is a diagram showing a cross section of the internal structure shown in FIG. 2 and is a diagram showing a state before joining the first connecting pipe line 27 and the second connecting pipe line 28. The internal structure shown in FIGS. 2 and 3 shows a structure in the vicinity thereof including the treatment tool insertion portion 222. Specifically, the internal structure shown in FIGS. 2 and 3 includes a first connecting line 27 and a second connecting line 28. In addition, a device-specific identifier (UDI) 100 for identifying the product is assigned. The UDI 100 is formed in the main body of the connecting pipeline 27 by laser processing. The first connecting line 27 and the second connecting line 28 are formed using stainless steel (for example, SUS304).
In the present embodiment, the first connecting line 27 corresponds to the first line, and the second connecting line 28 corresponds to the second line.
第１接続管路２７は、一端側が二股の管状をなす。具体的に、第１接続管路２７の第１接続部２７１が、該二股の一方に設けられている。第１接続管路２７において、二股の他方には、処置具挿入部２２２に接続する第２接続部２７２が設けられている。さらに第１接続管路２７の他端には、第２接続管２８に接続する第３接続部２７３が設けられている。 The first connecting pipe line 27 has a bifurcated tubular shape on one end side. Specifically, the first connection portion 271 of the first connection pipeline 27 is provided on one of the bifurcations. In the first connection line 27, a second connection portion 272 that connects to the treatment tool insertion portion 222 is provided on the other side of the bifurcation. Further, at the other end of the first connecting pipe 27, a third connecting portion 273 connected to the second connecting pipe 28 is provided.
第２接続管路２８は、一端に挿入部２１の管路に接続する第１接続部２８１が設けられ、他端には第１接続管路２７の第３接続部２７３に接続する第２接続部２８２が設けられている。第２接続管路の第２接続部２８２は、第１接続管路の第３接続部２７３に差し込まれ、管路接続部に相当する。 The second connection line 28 is provided with a first connection part 281 connected to the line of the insertion part 21 at one end, and a second connection connected to the third connection part 273 of the first connection line 27 at the other end. A portion 282 is provided. The second connection portion 282 of the second connection pipeline is inserted into the third connection portion 273 of the first connection pipeline and corresponds to the pipeline connection portion.
図３に示す内部構造において、処置具挿入部２２２に挿入された処置具５は、第１接続管路２７と第２接続管路２８とによって形成される管路を進入する。具体的に、処置具５は、第１接続管路２７の第２接続部２７２から第１接続管路２７の内部に進入し、第２接続管路２８を経て挿入部２１に進入する。また、第１接続管路２７と第２接続管路２８とによって形成される連通管路には、気体や液体等の媒体が流通する場合もある。
この際、第１接続管路２７の内周のなす径と、第２接続管路２８の内周のなす径とが、異なる場合、単に突き合わせただけだと、接続部分において段差が生じる。この段差に処置具５が引っかかってしまうと、処置具５がスムーズに挿入できない。本実施の形態では、溶接部３０によってこの段差を滑らかにして、処置具５の引っかかりを防止する。
In the internal structure shown in FIG. 3, the treatment tool 5 inserted into the treatment tool insertion portion 222 enters the pipeline formed by the first connection pipeline 27 and the second connection pipeline 28. Specifically, the treatment tool 5 enters the inside of the first connection line 27 from the second connection part 272 of the first connection line 27, and enters the insertion part 21 via the second connection line 28. Further, a medium such as gas or liquid may circulate in the communication line formed by the first connection line 27 and the second connection line 28.
At this time, if the diameter formed by the inner circumference of the first connecting pipe 27 and the diameter formed by the inner circumference of the second connecting pipe 28 are different, a step is generated at the connecting portion if they are simply butted against each other. If the treatment tool 5 is caught in this step, the treatment tool 5 cannot be smoothly inserted. In the present embodiment, the welded portion 30 smoothes the step to prevent the treatment tool 5 from being caught.
次に、上述した内部構造における第１接続管路２７と、第２接続管路２８との接合部分について図４を参照して説明する。図４は、図３に示す内部構造の管路の接続部分の構成を説明する断面図である。第１接続管路２７と第２接続管路２８とは、裏波溶接されてなる溶接部３０によって接合されている。溶接部３０は、周方向の全周に亘って連続して形成される溶接ビードからなる。溶接部３０には、第１接続管路２７の内周面側において溶接ビードが露出した露出部３１が形成される。第１接続管路２７の第３接続部２７３は、開口側の端部２７３ａが、溶接されずに残存する。 Next, the joint portion between the first connecting line 27 and the second connecting line 28 in the above-mentioned internal structure will be described with reference to FIG. FIG. 4 is a cross-sectional view illustrating the configuration of the connecting portion of the pipeline of the internal structure shown in FIG. The first connecting line 27 and the second connecting line 28 are joined by a welded portion 30 formed by back wave welding. The welded portion 30 is made of a weld bead that is continuously formed over the entire circumference in the circumferential direction. The welded portion 30 is formed with an exposed portion 31 in which the weld bead is exposed on the inner peripheral surface side of the first connecting pipeline 27. In the third connection portion 273 of the first connection pipeline 27, the end portion 273a on the opening side remains without being welded.
続いて、上述した内部構造における第１接続管路２７と、第２接続管路２８との接合について図５、６を参照して説明する。図５は、本発明の一実施の形態にかかる接続管路の溶接を説明する図（その１）である。図６は、本発明の一実施の形態にかかる接続管路の溶接を説明する図（その２）である。図５および図６では、第１接続管路２７の中心軸と、第２接続管路２８の中心軸とを、軸Ｎ1に一致させている。 Subsequently, the connection between the first connecting line 27 and the second connecting line 28 in the above-mentioned internal structure will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram (No. 1) for explaining welding of a connecting pipeline according to an embodiment of the present invention. FIG. 6 is a diagram (No. 2) for explaining welding of the connecting pipeline according to the embodiment of the present invention. 5 and 6, the central axis of the first connecting pipeline 27, the center axis of the second connecting pipeline 28 is made to coincide with the axis N 1.
第１接続管路２７の第３接続部２７３の内面には、径ｒ1を有し、開口を形成する大径部２７３ｂと、大径部２７３ｂの径ｒ1よりも小さい径ｒ2を有する小径部２７３ｃとが形成される。大径部２７３ｂは、小径部２７３ｃの間口から軸Ｎ1方向に延設される。ここで、小径部２７３ｃの間口とは、大径部２７３ｂに連なる側の開口をさす。
第２接続管２８の外周のなす径ｒ3は、大径部２７３ｂの径ｒ1よりも小さい。
第２接続管２８の内周のなす径ｒ4は、上述した処置具５が挿通できる範囲であれば、小径部２７３ｃの径ｒ2に対して同じであっても、大きくても小さくてもよいが、上述した段差が大きいほど、溶接部３０を形成する効果が大きい。
ここで、第１接続管路２７の肉厚は、第２接続管路２８の肉厚と同じであってもよいし、異なっていてもよい。第１接続管路２７は、例えば、大径部２７３ｂの径ｒ1がφ６ｍｍ、肉厚が０．４ｍｍである。
The inner surface of the third connecting portion 273 of the first connecting pipeline 27 has a diameter r 1 and has a large diameter portion 273 b forming an opening and a diameter r 2 smaller than the diameter r 1 of the large diameter portion 273 b . A small diameter portion 273c is formed. The large diameter portion 273b extends in the axis N 1 direction from the frontage of the small diameter portion 273c. Here, the frontage of the small diameter portion 273c refers to the opening on the side connected to the large diameter portion 273b.
The diameter r 3 formed by the outer circumference of the second connecting pipe 28 is smaller than the diameter r 1 of the large diameter portion 273b.
The diameter r 4 formed by the inner circumference of the second connecting pipe 28 may be the same as, larger or smaller than the diameter r 2 of the small diameter portion 273c as long as the above-mentioned treatment tool 5 can be inserted. However, the larger the above-mentioned step, the greater the effect of forming the welded portion 30.
Here, the wall thickness of the first connecting line 27 may be the same as or different from the wall thickness of the second connecting line 28. The first connecting pipe line 27 has, for example, a large diameter portion 273b having a diameter r 1 of φ6 mm and a wall thickness of 0.4 mm.
ここで、大径部２７３ｂの中心軸（軸Ｎ1）方向の長さｄ1は、第２接続管路２８の中心軸（軸Ｎ1）方向の長さｄ2よりも短い。 Here, the length d 1 of the large-diameter portion 273b in the central axis (axis N 1 ) direction is shorter than the length d 2 in the central axis (axis N 1 ) direction of the second connecting line 28.
まず、第１接続管路２７の第３接続部２７３の内部に、第２接続管路２８の第２接続部２８２を挿入する（図５参照）。具体的には、第２接続管路２８の第２接続部２８２が、大径部２７３ｂに収容されている。 First, the second connection portion 282 of the second connection pipeline 28 is inserted into the inside of the third connection portion 273 of the first connection pipeline 27 (see FIG. 5). Specifically, the second connection portion 282 of the second connection pipeline 28 is housed in the large diameter portion 273b.
第２接続管路２８の第２接続部２８２が第１接続管路２７の第３接続部２７３に挿入された状態では、第２接続管路２８の第２接続部２８２の端部２８３が、大径部２７３ｂの間口と反対側の端部に形成される段部２７３ｄに当接している（図６参照）。ここで、大径部２７３ｂの間口とは、小径部２７３ｃに連なる側と反対側の開口であり、第１接続管路２７の端部の開口をさす。
本実施の形態では、第２接続管路２８の第２接続部２８２の端部２８３と第１接続管路２７の第３接続部２７３とが突き合わさっている領域を、衝合領域４０という。衝合領域４０は、第２接続管路の第２接続部２８２の端部２８３（端面）に倣った環状をなす領域であり、対向領域に相当する。第１接続管路の第３接続部２７３に第２接続管路の第２接続部２８２が挿入された状態では、図示しない治具によって、第１接続管路２７と第２接続管路２８との位置関係が固定される。
In a state where the second connecting portion 282 of the second connecting pipeline 28 is inserted into the third connecting portion 273 of the first connecting pipeline 27, the end portion 283 of the second connecting portion 282 of the second connecting pipeline 28 is It is in contact with the stepped portion 273d formed at the end opposite to the frontage of the large diameter portion 273b (see FIG. 6). Here, the frontage of the large-diameter portion 273b is an opening on the side opposite to the side connected to the small-diameter portion 273c, and refers to the opening at the end of the first connecting pipeline 27.
In the present embodiment, the region where the end portion 283 of the second connecting portion 282 of the second connecting pipe 28 and the third connecting portion 273 of the first connecting pipe 27 abut is referred to as an abutting region 40. The conflux region 40 is an annular region that follows the end portion 283 (end face) of the second connection portion 282 of the second connection pipeline, and corresponds to an opposite region. In a state where the second connection portion 282 of the second connection pipeline is inserted into the third connection portion 273 of the first connection pipeline, the first connection pipeline 27 and the second connection pipeline 28 are connected by a jig (not shown). The positional relationship of is fixed.
ここで、大径部２７３ｂと第２接続管路２８の第２接続部２８２との間には、隙間Ｓ1が形成される。隙間Ｓ1の形成のため、大径部２７３ｂの内周面と、第２接続管路２８の第２接続部２８２の外周面とは、非接触の状態が維持される。このとき、第１接続管路２７の中心軸と、第２接続管路２８の中心軸とは、それぞれ軸Ｎ1と一致する。第１接続管路２７の中心軸と、第２接続管路２８の中心軸とが、それぞれ軸Ｎ1と一致しない場合は、第２接続管路２８の第２接続部２８２の外周面の一部が、大径部２７３ｂに接触した状態となる。 Here, a gap S 1 is formed between the large diameter portion 273b and the second connecting portion 282 of the second connecting pipeline 28. Due to the formation of the gap S 1 , the inner peripheral surface of the large diameter portion 273b and the outer peripheral surface of the second connecting portion 282 of the second connecting pipeline 28 are maintained in a non-contact state. At this time, the central axis of the first connecting line 27 and the central axis of the second connecting line 28 coincide with the axis N 1 , respectively. If the central axis of the first connecting line 27 and the central axis of the second connecting line 28 do not match the axis N 1 , one of the outer peripheral surfaces of the second connecting part 282 of the second connecting line 28. The portion is in contact with the large diameter portion 273b.
その後、レーザ光Ｌを照射して、第１接続管路２７と第２接続管路２８とを接合する。レーザ光Ｌは、第１接続管路２７の外周側から照射される。この際、レーザ光Ｌは、軸Ｎ1と直交する方向において第１接続管路２７と第２接続管路２８とが重なり合う位置であって、光軸ＮLが衝合領域４０を含み、かつ大径部２７３ｂの軸Ｎ1方向の端部であって、小径部２７３ｃに連なる側と反対側の端部（端部２７３ａ）を含まない領域に照射される。本実施の形態では、レーザ光Ｌの光軸ＮLが、衝合領域４０における軸Ｎ1方向の中央部を通過する。 After that, the laser beam L is irradiated to join the first connecting line 27 and the second connecting line 28. The laser beam L is emitted from the outer peripheral side of the first connecting pipe line 27. At this time, the laser beam L is at a position where the first connecting line 27 and the second connecting line 28 overlap in the direction orthogonal to the axis N 1 , the optical axis N L includes the abutting region 40, and a shaft N 1 direction of the end portion of the large-diameter portion 273b, is irradiated to the region not including an end portion of the side continuous to the small-diameter portion 273c opposite the (end 273a). In this embodiment, the optical axis N L of the laser beam L passes through the central portion of the axial N 1 direction in the abutment region 40.
ここで、図４に示す溶接部３０（溶接ビード）の形成に用いるレーザ光は、発振周期をナノ秒から数秒単位で制御可能である。レーザ光は、溶接位置および溶接領域を制御するという観点で、ファイバレーザなど、照射領域を制御可能な装置を用いて生成されることが好ましい。 Here, the laser beam used for forming the welded portion 30 (weld bead) shown in FIG. 4 can control the oscillation period in units of nanoseconds to several seconds. The laser beam is preferably generated using a device capable of controlling the irradiation region, such as a fiber laser, from the viewpoint of controlling the welding position and the welding region.
レーザ光Ｌの照射位置を、第１接続管路２７の周方向に移動させながら、溶接ビードを形成することによって、図４に示す溶接部３０が形成される。また、溶接時、レーザ光Ｌによって、第２接続管路２８の内周まで溶融させて溶接ビードを形成する。これによって、露出部３１を有する溶接部３０が形成される。溶接部３０によって接合された第１管路２７および第２管路２８は、第１管路２７の小径部２７３ｃと、第２管路２８の内周面とによって連通管路を形成する。 The welded portion 30 shown in FIG. 4 is formed by forming a weld bead while moving the irradiation position of the laser beam L in the circumferential direction of the first connecting pipe line 27. Further, at the time of welding, the laser beam L melts the inner circumference of the second connecting pipe line 28 to form a welding bead. As a result, the welded portion 30 having the exposed portion 31 is formed. The first pipeline 27 and the second pipeline 28 joined by the welded portion 30 form a communication pipeline by the small diameter portion 273c of the first pipeline 27 and the inner peripheral surface of the second pipeline 28.
溶接部３０の中心軸（軸Ｎ1）方向の長さｄB1（ビード幅）は、第２接続管路２８の第２接続部２８２のうち大径部２７３ｂに収容されている部分の中心軸（軸Ｎ1）方向の長さｄ1よりも短い。これによって、溶接部３０によって接合された第１接続管路２７と第２接続管路２８とにおいて、第１接続管路２７の第３接続部２７３の第１接続部２７１に連なる側と反対側の端部であって、第１接続管路２７の軸Ｎ1方向の端部２７３ａは、溶融せずに残存した状態となっている。端部２７３ａを残すことによって、溶融金属（溶金）が隙間Ｓ1、Ｓ2に流れ込んだ場合に、端部２７３ａ側から溶金を確保できる。この結果、溶接部分におけるアンダーフィル（えぐれ）の発生を抑制できる。この際、ビード幅を大きくすることによって、溶金の量を調整することができる。例えば、ビード幅（長さｄB1）は、隙間Ｓ1の軸Ｎ1方向と直交する方向の長さ（（径ｒ1−径ｒ3）／２）の６倍程度に設定される。また、大径部２７３ｂの中心軸（軸Ｎ1）方向の長さｄ1は、ビード幅（長さｄB1）よりも大きい。 The length d B1 (bead width) in the direction of the central axis (axis N 1 ) of the welded portion 30 is the central axis of the portion of the second connecting portion 282 of the second connecting pipe 28 that is housed in the large diameter portion 273b. It is shorter than the length d 1 in the (axis N 1 ) direction. As a result, in the first connecting line 27 and the second connecting line 28 joined by the welded part 30, the side opposite to the side connected to the first connecting part 271 of the third connecting part 273 of the first connecting line 27. The end portion 273a of the first connecting pipeline 27 in the axis N 1 direction is in a state of remaining without being melted. By leaving the end portion 273a, when the molten metal (molten metal) flows into the gaps S 1 and S 2 , the molten metal can be secured from the end portion 273a side. As a result, the occurrence of underfill (gouge) in the welded portion can be suppressed. At this time, the amount of molten metal can be adjusted by increasing the bead width. For example, the bead width (length d B1 ) is set to be about 6 times the length ((diameter r 1 − diameter r 3 ) / 2) in the direction orthogonal to the axis N 1 direction of the gap S 1 . Further, the length d 1 in the central axis (axis N 1 ) direction of the large diameter portion 273 b is larger than the bead width (length d B 1 ).
図７は、接合後の管路の一例を示す図である。図７は、第２接続管路２８０の内径が、第１接続管路２７０の内径よりも大きい例を示している。図７では、第１接続管路２７０と、第２接続管路２８０とが、溶接部３１０によって接合されている。また、第１接続管路２７０と、第２接続管路２８０との各中心軸は、軸Ｎ10と一致している。この際、第１接続管路２７０と、第２接続管路２８０との間には、隙間Ｓ10が形成されている。図７に示す溶接部３１０には、えぐれが発生していないことが分かる。また、内周面において、第１接続管路２７０と、第２接続管路２８０とが、滑らかに連なっていることも分かる。 FIG. 7 is a diagram showing an example of a pipeline after joining. FIG. 7 shows an example in which the inner diameter of the second connecting pipe 280 is larger than the inner diameter of the first connecting pipe 270. In FIG. 7, the first connecting line 270 and the second connecting line 280 are joined by a welded portion 310. Further, each central axis of the first connecting line 270 and the second connecting line 280 coincides with the axis N 10 . At this time, a gap S 10 is formed between the first connecting line 270 and the second connecting line 280. It can be seen that the welded portion 310 shown in FIG. 7 is not gouged. It can also be seen that the first connecting line 270 and the second connecting line 280 are smoothly connected on the inner peripheral surface.
以上説明した本発明の実施の形態では、第２接続管路２８の挿入長さ（ここでは長さｄ1）を、溶接部３０を形成する溶接ビードの長さ（ここでは長さｄB1）よりも大きくし、溶接部３０形成後であっても、第１接続管路２７の端部２７３ａを残存させた。第１接続管路２７の端部２７３ａを残存させて溶接部３２を形成することによって、本実施の形態によれば、接合強度が低下することなく裏波溶接された管路同士の接合構造を得ることができる。 In the embodiment of the present invention described above, the insertion length of the second connecting pipe line 28 (here, the length d 1 ) is set to the length of the weld bead forming the welded portion 30 (here, the length d B 1 ). Even after the welded portion 30 was formed, the end portion 273a of the first connecting pipe line 27 remained. By forming the welded portion 32 by leaving the end portion 273a of the first connecting pipeline 27 remaining, according to the present embodiment, a joint structure between the pipelines welded in the back wave is formed without lowering the joint strength. Obtainable.
また、上述した実施の形態によれば、裏波溶接され、第１接続管路２７の内周面と、露出部３１と、第２接続管路２８の内周面とが滑らかに連なるため、処置具５を挿入した際にも引っかかりを防止できる。 Further, according to the above-described embodiment, the inner peripheral surface of the first connecting pipe line 27, the exposed portion 31, and the inner peripheral surface of the second connecting pipe line 28 are smoothly connected by back wave welding. Even when the treatment tool 5 is inserted, it can be prevented from being caught.
（実施の形態の変形例１）
次に、本発明の実施の形態の変形例１について説明する。本変形例１において接続対象となる第１接続管路および第２接続管路は、実施の形態で説明した第１接続管路２７および第２接続管路２８と同じであるため、説明を省略する。上述した実施の形態では、第１接続管路２７と第２接続管路２８とを突き合わせて溶接するものとして説明したが、本変形例１は、接合前の段階において第２接続管路２８の第２接続部２８２の端部２８３と、第１接続管路２７の第３接続部２７３の段部２７３ｄとが、非接触であり、両者の間に隙間が生じている。
(Modification 1 of the embodiment)
Next, a modification 1 of the embodiment of the present invention will be described. Since the first connection line and the second connection line to be connected in the first modification are the same as the first connection line 27 and the second connection line 28 described in the embodiment, the description thereof will be omitted. To do. In the above-described embodiment, the first connecting line 27 and the second connecting line 28 have been described as being butted and welded to each other, but in the present modification 1, the second connecting line 28 is welded at a stage before joining. The end portion 283 of the second connecting portion 282 and the step portion 273d of the third connecting portion 273 of the first connecting line 27 are not in contact with each other, and a gap is formed between the two.
本変形例における第１接続管路２７と、第２接続管路２８との接合部分について図８、９を参照して説明する。図８は、本発明の実施の形態の変形例１にかかる接続管路の溶接を説明する図（その１）である。図９は、本発明の実施の形態の変形例１にかかる接続管路の溶接を説明する図（その２）である。 The joint portion between the first connecting line 27 and the second connecting line 28 in this modification will be described with reference to FIGS. 8 and 9. FIG. 8 is a diagram (No. 1) for explaining welding of the connecting pipeline according to the first modification of the embodiment of the present invention. FIG. 9 is a diagram (No. 2) for explaining welding of the connecting pipeline according to the first modification of the embodiment of the present invention.
まず、第１接続管路２７の第３接続部２７３の内部に、第２接続管路２８の第２接続部２８２を挿入する（図８参照）。具体的には、第２接続管路２８の第２接続部２８２が、大径部２７３ｂに収容されている。 First, the second connection portion 282 of the second connection pipeline 28 is inserted into the inside of the third connection portion 273 of the first connection pipeline 27 (see FIG. 8). Specifically, the second connection portion 282 of the second connection pipeline 28 is housed in the large diameter portion 273b.
第２接続管路の第２接続部２８２が第１接続管路２７の第３接続部２７３に挿入された状態では、第２接続管路２８の第２接続部２８２の端部２８３と、大径部２７３ｂと小径部２７３ｃとが形成する段部２７３ｄとが、非接触であり、両者の間に隙間Ｓ2が生じている。第２接続管路２８の第２接続部２８２のうち大径部２７３ｂに収容されている部分の中心軸（軸Ｎ1）方向の長さｄ3は、大径部２７３ｂの中心軸（軸Ｎ1）方向の長さｄ1よりも短い。 When the second connection portion 282 of the second connection pipeline is inserted into the third connection portion 273 of the first connection pipeline 27, the end portion 283 of the second connection portion 282 of the second connection pipeline 28 is large. The step portion 273d formed by the diameter portion 273b and the small diameter portion 273c is not in contact with each other, and a gap S 2 is formed between the two . The length d 3 of the portion of the second connecting portion 282 of the second connecting pipe 28 in the direction of the central axis (axis N 1 ) of the portion accommodated in the large diameter portion 273b is the central axis (axis N) of the large diameter portion 273b. 1 ) Shorter than the length d 1 in the direction.
本変形例１では、第２接続管路２８の第２接続部２８２の端部２８３と第１接続管路２７の第３接続部２７３の段部２７３ｄとが対向する領域を、対向領域４１という。対向領域４１は、第２接続管路２８の第２接続部２８２の端部２８３（端面）に倣った環状をなす領域であって、第２接続管路２８の第２接続部２８２の端部２８３と段部２７３ｄとが向かい合う領域である。第１接続管路２７の第３接続部２７３に第２接続管路２８の第２接続部２８２が挿入された状態では、図示しない治具によって、第１接続管路２７と第２接続管路２８との位置関係が固定される。また、大径部２７３ｂと、第２接続管路２８の第２接続部２８２との間には、隙間Ｓ1が形成されている。
ここで、軸Ｎ1と直交する方向における隙間Ｓ1の長さｄS1と、軸Ｎ1方向における隙間Ｓ2の長さｄS2とは、同じである。なお、後述する溶接部３２が形成できれば、互いに異なる長さであってもよい。
In the first modification, the region where the end portion 283 of the second connection portion 282 of the second connection pipeline 28 and the step portion 273d of the third connection portion 273 of the first connection pipeline 27 face each other is referred to as an opposite region 41. .. The facing region 41 is an annular region that follows the end portion 283 (end surface) of the second connecting portion 282 of the second connecting pipeline 28, and is an end portion of the second connecting portion 282 of the second connecting pipeline 28. This is an area where the 283 and the step portion 273d face each other. In a state where the second connection portion 282 of the second connection pipeline 28 is inserted into the third connection portion 273 of the first connection pipeline 27, the first connection pipeline 27 and the second connection pipeline 27 are used by a jig (not shown). The positional relationship with 28 is fixed. Further, a large-diameter portion 273b, between the second connecting portion 282 of the second connecting pipeline 28, the gap S 1 is formed.
Here, the length d S1 of the gap S 1 in the direction perpendicular to the axis N 1, and the length d S2 of the gap S 2 in the axial N 1 direction, the same. If the welded portions 32 described later can be formed, the lengths may be different from each other.
その後、レーザ光Ｌを照射して、第１接続管路２７と第２接続管路２８とを接合する。第１接続管路２７と第２接続管路２８とは、溶接部３２によって接合される。レーザ光Ｌは、第１接続管路２７の外周側から照射される。この際、レーザ光Ｌは、軸Ｎ1と直交する方向において第１接続管路２７と第２接続管路２８とが重なり合う位置であって、光軸ＮLが対向領域４１を通過する位置に照射される。本変形例１では、レーザ光Ｌの光軸ＮLが、対向領域４１における軸Ｎ1方向の中央部を通過する。 After that, the laser beam L is irradiated to join the first connecting line 27 and the second connecting line 28. The first connecting line 27 and the second connecting line 28 are joined by a welded portion 32. The laser beam L is emitted from the outer peripheral side of the first connecting pipe line 27. At this time, the laser beam L is at a position where the first connecting line 27 and the second connecting line 28 overlap in a direction orthogonal to the axis N 1, and the optical axis N L passes through the facing region 41. Be irradiated. In the first modification, the optical axis N L of the laser beam L passes through the central portion of the axial N 1 direction in the opposing region 41.
レーザ光Ｌの照射位置を、第１接続管路２７の周方向に移動させながら、溶接ビードを形成することによって、図９に示す溶接部３２が形成される。また、溶接時、レーザ光Ｌによって、第２接続管路２８の内周まで溶融させて溶接ビードを形成する。これによって、露出部３３を有する溶接部３２が形成される。 The welded portion 32 shown in FIG. 9 is formed by forming a weld bead while moving the irradiation position of the laser beam L in the circumferential direction of the first connecting pipe line 27. Further, at the time of welding, the laser beam L melts the inner circumference of the second connecting pipe line 28 to form a welding bead. As a result, the welded portion 32 having the exposed portion 33 is formed.
溶接部３２の中心軸（軸Ｎ1）方向の長さｄB2は、大径部２７３ｂの中心軸（軸Ｎ1）方向の長さｄ1よりも短い。これによって、溶接部３２によって接合された第１接続管路２７と第２接続管路２８とにおいて、第１接続管路２７の第３接続部２７３の第１接続部２７１に連なる側と反対側の端部であって、第１接続管路２７の軸Ｎ1方向の端部２７３ａは、溶融せずに残存した状態となっている。例えば、ビード幅（長さｄB2）は、長さｄS1、ｄS2のうちの大きい方の長さの６倍程度に設定される。
ここで、上述した従来の隅肉溶接では、溶金が隙間Ｓ1や隙間Ｓ２に流れ込み、溶金が不足することで第２接続管路２８の外周面に、えぐれが発生する。
これに対し、本変形例１では、端部２７３ａを残すことによって、隙間Ｓ1や隙間Ｓ２に流れ込む溶金を確保できる。この結果、第２接続管路２８の外周面のえぐれ発生を抑制できる。
The length d B2 of the welded portion 32 in the central axis (axis N 1 ) direction is shorter than the length d 1 of the large diameter portion 273 b in the central axis (axis N 1 ) direction. As a result, in the first connecting line 27 and the second connecting line 28 joined by the welded part 32, the side opposite to the side connected to the first connecting part 271 of the third connecting part 273 of the first connecting line 27. The end portion 273a of the first connecting pipeline 27 in the axis N 1 direction is in a state of remaining without being melted. For example, the bead width (length d B2 ) is set to be about 6 times the longer of the lengths d S1 and d S2 .
Here, in the conventional fillet welding as described above,溶金flows into the gap S 1 and the gap S 2, on the outer peripheral surface of the second connecting pipeline 28 by insufficient溶金, hollowed occurs.
In contrast, in the present modified example 1, by leaving the ends 273a, it can be secured溶金flowing into the gaps S 1 and the clearance S 2. As a result, it is possible to suppress the occurrence of scooping on the outer peripheral surface of the second connecting pipeline 28.
以上説明した本変形例１では、第２接続管路２８の挿入長さ（ここでは長さｄ3）を、溶接部３２を形成する溶接ビードの長さ（ここでは長さｄB2）よりも大きくし、溶接部３２の形成後であっても、第１接続管路２７の端部２７３ａを残存させた。第１接続管路２７の端部２７３ａを残存させて溶接部３２を形成することによって、本変形例によれば、接合強度が低下することなく裏波溶接された管路同士の接合構造を得ることができる。 In the present modification 1 described above, the insertion length (here, length d 3 ) of the second connecting pipe line 28 is larger than the length of the weld bead (here, length d B2 ) forming the welded portion 32. The size was increased so that the end portion 273a of the first connecting pipeline 27 remained even after the welded portion 32 was formed. By forming the welded portion 32 by leaving the end portion 273a of the first connecting pipeline 27 remaining, according to this modification, a joint structure between pipelines welded by back wave is obtained without lowering the joint strength. be able to.
（実施の形態の変形例２）
次に、本発明の実施の形態の変形例２について説明する。図１０は、本発明の実施の形態の変形例２にかかる接続管路の溶接を説明する図である。本変形例２は、実施の形態で説明した第１接続管路２７に代えて第１接続管路２７Ａを備える。第２接続管路２８は、上述した実施の形態と同じであるため、説明を省略する。
(Modification 2 of the embodiment)
Next, a modification 2 of the embodiment of the present invention will be described. FIG. 10 is a diagram illustrating welding of a connecting pipeline according to a modification 2 of the embodiment of the present invention. The second modification includes the first connecting line 27A instead of the first connecting line 27 described in the embodiment. Since the second connecting line 28 is the same as the above-described embodiment, the description thereof will be omitted.
第１接続管路２７Ａは、第１接続管路２７と同様、一端側が二股の管状をなす。本変形例２にかかる第１接続管路２７Ａは、上述した第１接続管路２７の第３接続部２７３において、大径部２７３ｂに代えて大径部２７３ｅを有する。小径部２７３ｃは、上述した実施の形態と同じである。 Like the first connecting pipe 27, the first connecting pipe 27A has a bifurcated tubular shape on one end side. The first connection line 27A according to the second modification has a large diameter part 273e instead of the large diameter part 273b in the third connection part 273 of the first connection line 27 described above. The small diameter portion 273c is the same as that of the above-described embodiment.
大径部２７３ｅは、小径部２７３ｃに連なる側から軸Ｎ1方向に延設される。大径部２７３ｅは、小径部２７３ｃに連なる側から他端側の間口に向かって拡径した形状をなす。ここで、大径部２７３ｅの最小の径、すなわち、小径部２７３ｃに連なる側の端部の径は、第２接続管２８の外周のなす径ｒ3よりも大きい。 The large diameter portion 273e extends in the axis N 1 direction from the side connected to the small diameter portion 273c. The large diameter portion 273e has a shape in which the diameter increases from the side connected to the small diameter portion 273c toward the frontage on the other end side. Here, the minimum diameter of the large diameter portion 273 e, i.e., the diameter of the end portion of the side continuous to the small diameter portion 273 c, greater than the forming diameter r 3 of the outer periphery of the second connecting pipe 28.
第１接続管路２７と第２接続管路２８とを接合する際には、まず、第１接続管路２７Ａの第３接続部２７３の大径部２７３ｅに、第２接続管路２８の第２接続部２８２を挿入する。その後、レーザ光を照射して、第１接続管路２７Ａと第２接続管路２８とを接合する。接合後は、上述した実施の形態と同様、第１接続管路２７Ａの第３接続部２７３の第１接続部２７１に連なる側と反対側の端部であって、第１接続管路２７Ａの軸Ｎ1方向の端部２７３ａが、溶融せずに残存した状態となる。 When joining the first connecting line 27 and the second connecting line 28, first, the large diameter portion 273e of the third connecting part 273 of the first connecting line 27A is connected to the second connecting line 28. 2 Insert the connection portion 282. After that, a laser beam is irradiated to join the first connecting line 27A and the second connecting line 28. After joining, as in the above-described embodiment, the end of the first connecting line 27A, which is the end opposite to the side connected to the first connecting part 271 of the third connecting part 273, is the first connecting line 27A. The end portion 273a in the axis N 1 direction remains without melting.
上述した本変形例２によれば、第１接続管路２７Ａにおいて、第２接続管路２８が挿入される側の開口が拡径している場合であっても、上述した実施の形態と同様の効果を得ることができる。 According to the above-described second modification, even when the opening on the side where the second connection line 28 is inserted is widened in the first connection line 27A, it is the same as that of the above-described embodiment. The effect of can be obtained.
ここまで、本発明を実施するための形態を説明してきたが、本発明は上述した実施の形態によってのみ限定されるべきものではない。例えば、上述した実施の形態では、内視鏡の構成を例に説明したが、マニピュレータ等、接続する二つの管路を有する構造を備えた装置であれば適用可能である。 Although the embodiments for carrying out the present invention have been described so far, the present invention should not be limited only to the above-described embodiments. For example, in the above-described embodiment, the configuration of the endoscope has been described as an example, but any device having a structure having two connecting pipelines, such as a manipulator, can be applied.
また、上述した実施の形態および変形例では、第１接続管路２７と第２接続管路２８との間に隙間が形成されているものとして説明したが、隙間なく挿入（嵌合）される構成としてもよい。 Further, in the above-described embodiments and modifications, it has been described that a gap is formed between the first connecting pipe 27 and the second connecting pipe 28, but the gap is inserted (fitted) without a gap. It may be configured.
また、上述した実施の形態および変形例にかかる溶接部の各溶接ビードは、形状や大きさがすべてにおいて、または一部において互いに異なっていてもよい。また、溶接ビードの個数や配置は、要求される捻り強度に応じて適宜変更することができる。 Further, the weld beads of the welded portions according to the above-described embodiments and modifications may be different in shape and size in all or in part. Further, the number and arrangement of the weld beads can be appropriately changed according to the required torsional strength.
また、上述した実施の形態および変形例では、レーザ光によるレーザ溶接を行うものとして説明したが、接合方法はこれに限らない。例えば、電子ビーム溶接等の公知の溶接技術を用いることも可能である。 Further, in the above-described embodiments and modifications, laser welding with a laser beam has been described, but the joining method is not limited to this. For example, it is also possible to use a known welding technique such as electron beam welding.
本発明は、特許請求の範囲に記載した技術的思想を逸脱しない範囲内において、様々な実施の形態を含みうるものである。 The present invention may include various embodiments within the scope of the technical ideas described in the claims.
１ 内視鏡システム
２ 内視鏡
３ 処理装置
４ 表示装置
２１ 挿入部
２２ 操作部
２３ ユニバーサルコード
２４ 先端部
２５ 湾曲部
２６ 可撓管部
２７、２７Ａ 第１接続管路
２８ 第２接続管路
３０、３２ 溶接部
３１、３３ 露出部
1 Endoscope system 2 Endoscope 3 Processing device 4 Display device 21 Insertion part 22 Operation part 23 Universal cord 24 Tip part 25 Curved part 26 Flexible pipe part 27, 27A 1st connection pipe 28 2nd connection pipe 30 , 32 Welded part 31, 33 Exposed part
Claims (2)
前記第一の管路は、前記第二の管路に連なって前記連通管路の一部を形成する小径部と、前記小径部の間口から当該第一の管路の中心軸方向に延設し、内径が前記小径部の内径よりも大きい大径部と、前記大径部の間口と反対側の端部に形成される段部とを有し、
前記第二の管路は、前記第一の管路の一端に挿入され、外径が前記大径部の内径よりも小さい管路接続部であって、当該第二の管路の中心軸方向における長さが前記第一の管路への挿入長よりも長い管路接続部を有し、
前記段部と前記管路接続部とが対向する対向領域を含み、かつ前記大径部の間口側の端部が非含有の領域であって、前記第一の管路の周方向の全周に亘る領域にレーザ光を照射して、前記第一の管路の外表面から前記第一の管路の厚さ方向に前記第二の管路の内周面まで裏波溶接された溶接部が形成される
内視鏡管路の溶接構造。 In the welded structure of an endoscopic pipeline, in which a part of the second pipeline is inserted into one end of the first conduit and the inserted portion is welded to form a communicating pipeline.
The first pipeline has a small diameter portion connected to the second pipeline to form a part of the communication pipeline, and extends from the frontage of the small diameter portion in the direction of the central axis of the first pipeline. It has a large diameter portion whose inner diameter is larger than the inner diameter of the small diameter portion, and a step portion formed at an end opposite to the frontage of the large diameter portion.
The second pipeline is a pipeline connection portion that is inserted into one end of the first pipeline and has an outer diameter smaller than the inner diameter of the large diameter portion, and is in the direction of the central axis of the second pipeline. Has a pipeline connection whose length is longer than the insertion length into the first conduit.
A region in which the step portion and the pipeline connecting portion face each other and the end portion on the frontage side of the large-diameter portion is not contained, and the entire circumference in the circumferential direction of the first pipeline A welded portion that is back-wave welded from the outer surface of the first pipeline to the inner peripheral surface of the second pipeline in the thickness direction of the first pipeline by irradiating a region extending over the area. The welded structure of the endoscopic conduit is formed.
請求項１に記載の内視鏡管路の溶接構造。 The welded structure for an endoscopic pipeline according to claim 1, wherein a gap is formed between the large diameter portion and the pipeline connecting portion.
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