JP7361507B2 - electric fusion plug - Google Patents

electric fusion plug Download PDF

Info

Publication number
JP7361507B2
JP7361507B2 JP2019114211A JP2019114211A JP7361507B2 JP 7361507 B2 JP7361507 B2 JP 7361507B2 JP 2019114211 A JP2019114211 A JP 2019114211A JP 2019114211 A JP2019114211 A JP 2019114211A JP 7361507 B2 JP7361507 B2 JP 7361507B2
Authority
JP
Japan
Prior art keywords
plug
plug body
elastic member
pipe
main body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2019114211A
Other languages
Japanese (ja)
Other versions
JP2021001618A (en
Inventor
晃士 加藤
正憲 阪
健吾 松井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Proterial Ltd
Original Assignee
Proterial Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Proterial Ltd filed Critical Proterial Ltd
Priority to JP2019114211A priority Critical patent/JP7361507B2/en
Publication of JP2021001618A publication Critical patent/JP2021001618A/en
Application granted granted Critical
Publication of JP7361507B2 publication Critical patent/JP7361507B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

本発明は、熱可塑性樹脂製の管の内部に形成される流路を閉塞する電気融着プラグに関する。 The present invention relates to an electrofusion plug that closes a flow path formed inside a tube made of thermoplastic resin.

従来から、都市ガスなどの燃料ガスや上水を需要家に供給するための埋設管には、例えば、ポリエチレンなどの熱可塑性樹脂製の管が広く使用されている。熱可塑性樹脂製の管の接続には、管と同様に熱可塑性樹脂で成形され、その内面に電熱線が埋め込まれた電気融着継手が使用されている。電気融着継手は、管に外嵌された状態で電熱線に通電することによって内面と管の外面とを融着接合させるので、容易に管と接続することができる。 Conventionally, for example, pipes made of thermoplastic resin such as polyethylene have been widely used as buried pipes for supplying fuel gas such as city gas and clean water to consumers. To connect thermoplastic resin tubes, an electric fusion joint is used, which is molded from thermoplastic resin like the tube and has heating wires embedded in its inner surface. An electric fusion joint can be easily connected to a pipe because it fuses and joins the inner surface and the outer surface of the pipe by energizing the heating wire while being fitted onto the outside of the pipe.

通常、流路の断面積を減少させないために、電気融着継手は管に外嵌されるタイプのものが一般的である。一方で、流路の断面積の減少を考慮する必要がない、例えば管の端部や途中で流路を閉塞させるような場合には、管の内径側に挿入されるものが求められる場合がある。 Generally, electric fusion joints are of the type that are fitted onto the outside of the pipe in order not to reduce the cross-sectional area of the flow path. On the other hand, in cases where there is no need to consider reducing the cross-sectional area of the flow path, for example when the flow path is blocked at the end of the pipe or in the middle, a device that can be inserted into the inner diameter of the pipe may be required. be.

そこで、管の内径側に挿入される電気融着式の部材として、いくつかのものが提案されている。例えば、特許文献１や特許文献２には、図６に示すような管の内径側に挿入される熱可塑性樹脂製円筒体の外周に発熱体が埋設された管路閉塞用キャップが開示されている。また、特許文献１には、管路閉塞用キャップが、管の端部に固定される中栓に螺合されている螺旋軸の先端に管路閉塞用キャップが被せられ、螺旋軸をねじ込むことで管内の所定の位置まで押し込まれることが開示されている。本明細書において、図６は特許文献１から転載して記載している。 Therefore, several types of electrofusion type members have been proposed to be inserted into the inner diameter side of the tube. For example, Patent Document 1 and Patent Document 2 disclose a pipe-blocking cap in which a heating element is embedded in the outer periphery of a cylindrical body made of thermoplastic resin that is inserted into the inner diameter side of a pipe as shown in FIG. There is. Further, Patent Document 1 discloses that the cap for conduit closure is placed on the tip of a helical shaft that is screwed onto an inner stopper fixed to the end of the pipe, and the helical shaft is screwed. It is disclosed that the tube is pushed into a predetermined position within the tube. In this specification, FIG. 6 is reproduced and described from Patent Document 1.

特開平６－２０７６９８号公報Japanese Patent Application Publication No. 6-207698 特開２００１－８２６６５号公報Japanese Patent Application Publication No. 2001-82665

特許文献１に開示されている方法によれば、螺旋軸はねじ込みによって直線的に移動するので、直線的に移動できる管端から比較的近い位置であれば管路閉塞用キャップを管の内径側に押し込むことができる。しかし、管端から比較的遠い位置、例えば、管端から数メートル離れた位置を、この方法で閉塞する場合には、押し込み量に応じて長い螺旋軸が必要になる。螺旋軸は長さが長いと管端への装着や取扱いが難しくなるので、広い作業スペースが必要になるという課題がある。 According to the method disclosed in Patent Document 1, the helical shaft moves linearly by screwing, so if it is relatively close to the end of the pipe where it can move linearly, the cap for blocking the pipe can be placed on the inner diameter side of the pipe. can be pushed into. However, when using this method to close a position relatively far from the tube end, for example, several meters away from the tube end, a long helical shaft is required depending on the amount of pushing. If the length of the helical shaft is long, it becomes difficult to attach it to the end of the tube and handle it, so there is a problem that a large working space is required.

また、特許文献１などに開示されている管端閉塞用キャップは、挿入される管の内径よりも外径が小さすぎると確実な融着接合ができなくなることから、挿入される管の内径と略同じ外径に形成される。そのため、挿入される管が大きく曲っているような場合には、所定の位置まで管路閉塞用キャップを押し込むことができないという課題がある。 In addition, if the outer diameter of the tube end closing cap disclosed in Patent Document 1 is too small than the inner diameter of the inserted tube, reliable fusion bonding cannot be achieved. They are formed to have approximately the same outer diameter. Therefore, if the tube to be inserted is significantly bent, there is a problem that the conduit closing cap cannot be pushed into a predetermined position.

本発明は、上記の諸課題に鑑みてなされたものであり、管の内径側に、管端から軸方向の所望の位置まで容易に挿入することができて、且つ、挿入された位置で確実に管と融着接合される電気融着プラグを提供すること目的とする。 The present invention has been made in view of the above-mentioned problems, and can be easily inserted into the inner diameter side of a tube from the tube end to a desired position in the axial direction, and can be reliably inserted at the inserted position. The purpose of the present invention is to provide an electric fusion plug that is fusion-bonded with a pipe.

上記目的を達成するために、本発明の電気融着プラグ１は、熱可塑性樹脂で形成されている円柱形状のプラグ本体部２と、プラグ本体部の外周部に配置されている発熱部３と、プラグ本体部の少なくとも一方の端部に設けられ、プラグ本体部を軸線方向に押圧しているプラグ本体部押圧手段４と、を有し、
プラグ本体部押圧手段４は、圧縮されることで圧縮方向と逆側の方向に向かって反発する弾性部材４１と、プラグ本体部に少なくとも一部が固定されており、弾性部材４１を圧縮した状態で保持している保持部材４２と、を有することを特徴とするものである。 In order to achieve the above object, the electric fusion plug 1 of the present invention includes a cylindrical plug body 2 made of thermoplastic resin, and a heat generating part 3 disposed on the outer periphery of the plug body. , a plug body pressing means 4 provided at at least one end of the plug body and pressing the plug body in the axial direction ,
The plug body pressing means 4 includes an elastic member 41 that rebounds in a direction opposite to the compression direction when compressed, and at least a portion thereof is fixed to the plug body, and the elastic member 41 is in a compressed state. The device is characterized in that it has a holding member 42 that is held by .

また、本発明の電気融着プラグにおいて、弾性部材４１は、圧縮される方向に貫通する空洞を有し、
保持部材４２は、
プラグ本体部の端部から軸線方向に延びるように設けられ、空洞に通されて弾性部材４１を保持している軸部４２１と、
軸部４２１における、プラグ本体部の側と逆側の端部に設けられ、弾性部材４１をプラグ本体部２に向かって圧縮している圧縮部４２２と、を有するものであってもよい。 Further, in the electrofusion plug of the present invention, the elastic member 41 has a cavity that penetrates in the direction of compression,
The holding member 42 is
a shaft portion 421 that is provided to extend in the axial direction from the end of the plug body, is passed through a cavity, and holds the elastic member 41;
It may also include a compression section 422 that is provided at the end of the shaft section 421 on the side opposite to the plug main body section and compresses the elastic member 41 toward the plug main body section 2 .

また、本発明の電気融着プラグにおいて、軸部４２１は、プラグ本体部２と螺合されて設けられてもよい。 Further, in the electrofusion plug of the present invention, the shaft portion 421 may be provided to be screwed into the plug body portion 2.

また、本発明の電気融着プラグにおいて、軸部４２１ａは、プラグ本体部２ａにインサート成形されて設けられてもよい Further, in the electrofusion plug of the present invention, the shaft portion 421a may be provided by insert molding in the plug body portion 2a.

本発明に係る電気融着プラグは、プラグ本体部がプラグ本体部押圧手段によって軸線方向に押圧されていることで、融着時には外径が拡大する。それにより、本発明に係る電気融着プラグは、その外面と管の内面との間に隙間がある場合であっても、融着時にはその隙間を埋めて外面が管の内面に密着することができるので、融着性を損なうことなく外径を管の内径に対して細くすることができる。このように、本発明によれば、管の内径側に容易に挿入できて、且つ挿入された位置で管と確実に融着接合される電気融着プラグを提供することができる。 In the electrofusion plug according to the present invention, the plug body is pressed in the axial direction by the plug body pressing means, so that the outer diameter expands during welding. Therefore, even if there is a gap between the outer surface of the electric welding plug and the inner surface of the tube, the electric welding plug according to the present invention can fill the gap and bring the outer surface into close contact with the inner surface of the tube during welding. Therefore, the outer diameter can be made smaller than the inner diameter of the tube without impairing the fusion properties. As described above, according to the present invention, it is possible to provide an electric fusion plug that can be easily inserted into the inner diameter side of a pipe and is reliably fusion-bonded to the pipe at the inserted position.

本発明の第１の実施の形態に係る電気融着プラグの正面図である。FIG. 1 is a front view of an electric fusion plug according to a first embodiment of the present invention. 本発明の第１の実施の形態に係る電気融着プラグの断面図である。FIG. 1 is a sectional view of an electric fusion plug according to a first embodiment of the present invention. 本発明の第１の実施の形態に係る電気融着プラグが管Ｐに挿入されている状態を示す断面図である。FIG. 2 is a cross-sectional view showing a state in which the electric fusion plug according to the first embodiment of the present invention is inserted into a pipe P. 本発明の第１の実施の形態に係る電気融着プラグが管Ｐに融着されている状態を示す断面図である。FIG. 2 is a cross-sectional view showing a state in which the electric fusion plug according to the first embodiment of the present invention is fused to a pipe P. 本発明の第２の実施の形態に係る電気融着プラグの断面図である。FIG. 3 is a cross-sectional view of an electric fusion plug according to a second embodiment of the present invention. 従来技術の管路閉塞用キャップを示す断面図である。FIG. 2 is a cross-sectional view showing a conventional conduit-blocking cap.

本発明の詳細について、図を参照しつつ説明する。なお、ここに記載する本発明の実施の形態はあくまで例示に過ぎず、本発明はこれに限られない。本発明の要旨の範囲内で種々の変更が可能である。 The details of the present invention will be explained with reference to the drawings. Note that the embodiments of the present invention described here are merely examples, and the present invention is not limited thereto. Various modifications are possible within the scope of the invention.

（第１の実施の形態）
図１は、本発明の第１の実施の形態に係る電気融着プラグの正面図である。図２は、本発明の第１の実施の形態に係る電気融着プラグの断面図である。 (First embodiment)
FIG. 1 is a front view of an electric fusion plug according to a first embodiment of the present invention. FIG. 2 is a sectional view of the electrofusion plug according to the first embodiment of the present invention.

図１に示すように、電気融着プラグ１は、プラグ本体部２と発熱部３と本体圧縮部４とを有している。 As shown in FIG. 1, the electric fusion plug 1 includes a plug body 2, a heat generating part 3, and a body compression part 4.

プラグ本体部２は、閉塞しようとする図示しない熱可塑性樹脂製の管Ｐと同じ熱可塑性樹脂で円柱形状に形成されている。プラグ本体部２の外径は、管Ｐの内径側に容易に挿入できるように、管Ｐの内径よりも細く形成されている。 The plug body 2 is formed into a cylindrical shape and made of the same thermoplastic resin as the thermoplastic resin pipe P (not shown) to be closed. The outer diameter of the plug main body part 2 is formed to be smaller than the inner diameter of the pipe P so that it can be easily inserted into the inner diameter side of the pipe P.

発熱部３は、プラグ本体部２の外周部に配置されている。発熱部３は、プラグ本体部２の外周部に形成されている２条の螺旋溝２１に埋め込まれている電熱線３１である。電熱線３１は、プラグ本体部２の軸線方向の一方の側（図１におけるプラグ本体部２の右側）から他方の側（図１におけるプラグ本体部２の左側）に向かって螺旋溝２１に埋め込まれて巻回されている。更に、電熱線３１は、他方の側で折り返されて一方の側に向かって螺旋溝２１に埋め込まれて外周部に巻回されている。このように、電熱線３１は、その両端がプラグ本体部２の軸線方向の一方の側（図１におけるプラグ本体部２の右側）に来るように設けられている。電熱線３１の両端は、プラグ本体部２の一方の側に固定されている通電用のコネクタピン３２に接続されている。管Ｐに電気融着プラグ１を融着接合する際、電熱線３１は、コネクタピン３２に接続された図示しない融着用電源装置によって通電されることで発熱して、プラグ本体部２と管Ｐとを加熱溶融させる。 The heat generating part 3 is arranged on the outer circumference of the plug main body part 2. The heat generating portion 3 is a heating wire 31 embedded in two spiral grooves 21 formed on the outer circumferential portion of the plug body portion 2 . The heating wire 31 is embedded in the spiral groove 21 from one side of the plug body 2 in the axial direction (the right side of the plug body 2 in FIG. 1) to the other side (the left side of the plug body 2 in FIG. 1). It is rolled up. Furthermore, the heating wire 31 is folded back on the other side, embedded in the spiral groove 21 toward one side, and wound around the outer periphery. In this way, the heating wire 31 is provided so that both ends thereof are on one side of the plug body 2 in the axial direction (the right side of the plug body 2 in FIG. 1). Both ends of the heating wire 31 are connected to an energizing connector pin 32 fixed to one side of the plug body 2. When the electric fusion plug 1 is fusion-bonded to the pipe P, the heating wire 31 is energized by a fusion power supply device (not shown) connected to the connector pin 32 and generates heat, which causes the plug body 2 and the pipe P to be fusion-bonded. Heat and melt.

発熱部３は、プラグ本体部と管とを加熱溶融することができればよく、図１に示す形態に限られず、他の形態の発熱部であってもよい。例えば、発熱部は、螺旋溝が形成されていない円柱形状のプラグ本体部の外周部に巻回されている、外周が熱可塑性樹脂で被覆されている電熱線（所謂、樹脂被覆電熱線）であってもよい。 The heat generating part 3 is not limited to the form shown in FIG. 1 as long as it can heat and melt the plug main body part and the pipe, and may be a heat generating part of other forms. For example, the heat generating part is a heating wire whose outer periphery is coated with thermoplastic resin (so-called resin-coated heating wire) that is wound around the outer periphery of a cylindrical plug main body in which no spiral groove is formed. There may be.

プラグ本体部押圧手段４は、弾性部材４１と、保持部材４２と、中間部材４３とを有し、プラグ本体部２の片側（図１におけるプラグ本体部２の左側）の端部に設けられ、プラグ本体部２を軸線方向に押圧している。 The plug body pressing means 4 includes an elastic member 41, a holding member 42, and an intermediate member 43, and is provided at an end of one side of the plug body 2 (the left side of the plug body 2 in FIG. 1), The plug main body portion 2 is pressed in the axial direction.

プラグ本体部押圧手段４の各部の詳細を順に説明する。
弾性部材４１は、例えば、コイルばねであり、圧縮される方向に貫通する空洞が形成されている、弾性を有する筒状の部材である。弾性部材４１は、圧縮されることで圧縮方向と逆側に向かって反発する。弾性部材４１は、コイルばねの他に、弾性を有する例えばゴムなどの材料で形成された筒状の部材であってもよい。 The details of each part of the plug body pressing means 4 will be explained in order.
The elastic member 41 is, for example, a coil spring, and is an elastic cylindrical member in which a cavity is formed that penetrates in the direction of compression. When the elastic member 41 is compressed, it rebounds in the opposite direction to the compression direction. In addition to the coil spring, the elastic member 41 may be a cylindrical member made of an elastic material such as rubber.

保持部材４２は、軸部４２１と圧縮部４２２とで構成されている。
軸部４２１は、プラグ本体部２の端部から軸線方向に延びるように設けられ、弾性部材４１の空洞に通されて弾性部材４１を保持している。軸部４２１は、プラグ本体部２の側の端部外周におねじ４２３が形成されている。軸部４２１は、プラグ本体部２に形成されている本体めねじ２２におねじ４２３がねじ込まれることで、プラグ本体部２に少なくとも一部が固定されている。 The holding member 42 includes a shaft portion 421 and a compression portion 422.
The shaft portion 421 is provided so as to extend in the axial direction from the end of the plug body portion 2, and is passed through the cavity of the elastic member 41 to hold the elastic member 41. A thread 423 is formed on the outer periphery of the end of the shaft portion 421 on the side of the plug body portion 2 . At least a portion of the shaft portion 421 is fixed to the plug body 2 by screwing a screw 423 into the female body thread 22 formed in the plug body 2 .

圧縮部４２２は、軸部４２１における、プラグ本体部２の側と逆側の端部に設けられている、軸部４２１よりも外径が大きくなるよう設けられている部分である。圧縮部４２２は、例えば、軸部４２１の端部に一体で形成されている鍔である。圧縮部４２２は、おねじ４２３を本体めねじ２２にねじ込むことで、弾性部材４１の端部を押して弾性部材４１をプラグ本体部２に向かって圧縮している。圧縮部４２２は、軸部と一体に形成された鍔の他に、ねじ込みなどの手段によって軸部４２１の端部に設けられてもよい。 The compression portion 422 is a portion of the shaft portion 421 that is provided at the end opposite to the plug body portion 2 and has an outer diameter larger than that of the shaft portion 421 . The compression part 422 is, for example, a collar integrally formed at the end of the shaft part 421. The compression part 422 compresses the elastic member 41 toward the plug body part 2 by pushing the end of the elastic member 41 by screwing the male thread 423 into the body female thread 22 . The compression portion 422 may be provided at the end of the shaft portion 421 by means such as screwing, in addition to a collar formed integrally with the shaft portion.

中間部材４３は、弾性部材４１とプラグ本体部２の間に挟まれて設けられている、例えば平座金などのリング部材である。弾性部材４１とプラグ本体部２との間に中間部４３を介在させることで、圧縮に伴う弾性部材４１の反発力が、プラグ本体部２の端面ＥＦに均等に伝えられる。したがって、弾性部材４１とプラグ本体部２との間に中間部材４３を介在させることが好ましい。一方で、弾性部材４１をプラグ本体部２に直接接触させても必要かつ十分な程度にプラグ本体部２の端面ＥＦに均等に弾性部材４１の反発力を伝えることができる場合には、中間部材４３は省略することができる。 The intermediate member 43 is a ring member such as a flat washer, which is provided between the elastic member 41 and the plug body 2. By interposing the intermediate portion 43 between the elastic member 41 and the plug body 2, the repulsive force of the elastic member 41 due to compression is evenly transmitted to the end surface EF of the plug body 2. Therefore, it is preferable to interpose the intermediate member 43 between the elastic member 41 and the plug body 2. On the other hand, if the repulsive force of the elastic member 41 can be evenly transmitted to the end surface EF of the plug body 2 to a necessary and sufficient degree even if the elastic member 41 is brought into direct contact with the plug body 2, the intermediate member 43 can be omitted.

次いで、電気融着プラグ１を使用して管Ｐの内部を閉塞する際の、電気融着プラグの動きを図３及び図４を参照して説明する。図３は、管Ｐの内部に電気融着プラグ１が挿入された状態を示し、図４は、管Ｐと電気融着プラグ１が融着されている状態を示す断面図である。 Next, the movement of the electrofusion plug 1 when the inside of the pipe P is closed using the electrofusion plug 1 will be explained with reference to FIGS. 3 and 4. FIG. 3 shows a state in which the electric welding plug 1 is inserted into the inside of the pipe P, and FIG. 4 is a sectional view showing a state in which the pipe P and the electric welding plug 1 are fused.

図３に示すように、電気融着プラグ１は、管Ｐの内部に挿入される。電気融着プラグ１は、管Ｐの内部の所定の位置まで、管Ｐの管端（図示を省略）から軸線方向に沿って挿入される。電気融着プラグ１は、例えば、挿入用の棒状の部材などの何らかの挿入手段によって管Ｐに挿入される。 As shown in FIG. 3, the electrofusion plug 1 is inserted into the interior of the pipe P. The electrofusion plug 1 is inserted into the tube P from the tube end (not shown) to a predetermined position inside the tube P along the axial direction. The electrofusion plug 1 is inserted into the pipe P by some kind of insertion means, such as a rod-shaped member for insertion.

電気融着プラグ１は、プラグ本体部２の外径が管Ｐの内径よりも細く形成されており、図３に示すように、管Ｐに挿入されたときには、プラグ本体部２の外面ＯＳと電気融着継手１の内面ＩＳとの間に隙間が形成されるようになっている。よって、電気融着プラグ１は、管Ｐの内部に容易に挿入される。また、挿入抵抗が小さいので管端から比較的遠い位置にも容易に挿入される。また、電気融着プラグ１は、挿入しようとする管Ｐが曲っていても、その曲りの程度が、挿入の際にプラグ本体部２の外面ＯＳと電気融着継手１の内面ＩＳとの間の隙間がなくならない程度のものであれば、管Ｐの内部に容易に挿入される。 The electrofusion plug 1 has a plug body 2 whose outer diameter is smaller than the inner diameter of the pipe P, and as shown in FIG. 3, when inserted into the pipe P, the outer surface OS of the plug body 2 and A gap is formed between the electric fusion joint 1 and the inner surface IS. Therefore, the electrofusion plug 1 is easily inserted into the pipe P. Furthermore, since the insertion resistance is low, it can be easily inserted into a position relatively far from the tube end. In addition, even if the pipe P to be inserted is bent, the degree of bending is such that the distance between the outer surface OS of the plug main body 2 and the inner surface IS of the electric fusion joint 1 is limited when the electric fusion plug 1 is inserted. It can be easily inserted into the inside of the pipe P as long as there is no gap between the two.

電気融着プラグ１は、管Ｐの内部の所定の位置まで挿入されたのち、コネクタピン３２に接続されている融着用電源装置（図示を省略）によって電熱線３１に通電することによって、図４に示すように管Ｐの内部と融着接合される。 After the electric fusion plug 1 is inserted to a predetermined position inside the pipe P, the heating wire 31 is energized by a fusion power supply device (not shown) connected to the connector pin 32, as shown in FIG. As shown in the figure, it is fused and joined to the inside of the pipe P.

電熱線３１に通電されると、プラグ本体部２は、電熱線３１が発熱することで加熱されて溶融する。加熱されて軟化したプラグ本体部２は、端面ＥＦがプラグ本体押圧手段４によって押圧されているので、弾性部材４１の反発力を受けて変形する。プラグ本体部２の軸心方向に沿った長さはＬ１からＬ２に短くなる。ここで、Ｌ１は変形前のプラグ本体部２の軸心方向の長さであり、Ｌ２は変形後のプラグ本体部２の軸心方向の長さである。プラグ本体部２の体積は大きく変わらないので、プラグ本体部２は、図４に示すように長さが短くなるに伴って外径が拡大する。プラグ本体部２は、管Ｐの内面ＩＳとの隙間を埋めるように外径が拡大して、外面ＯＳが管Ｐの内面ＩＳに密着する。電気融着プラグ１は、プラグ本体部２の外面ＯＳと管Ｐの内面ＩＳとが密着することで、電熱線３１の熱が両方にしっかりと伝わるので、管Ｐと確実に融着接合される。 When the heating wire 31 is energized, the plug body 2 is heated and melted by the heating wire 31 generating heat. The heated and softened plug main body 2 is deformed by the repulsive force of the elastic member 41 because the end face EF is pressed by the plug main body pressing means 4. The length of the plug main body portion 2 along the axial direction is shortened from L1 to L2. Here, L1 is the length of the plug main body 2 in the axial direction before deformation, and L2 is the length of the plug main body 2 in the axial direction after deformation. Since the volume of the plug main body 2 does not change significantly, the outer diameter of the plug main body 2 increases as the length becomes shorter, as shown in FIG. The outer diameter of the plug main body portion 2 is expanded to fill the gap with the inner surface IS of the pipe P, and the outer surface OS is brought into close contact with the inner surface IS of the pipe P. The electric fusion plug 1 is reliably fusion-bonded to the pipe P because the outer surface OS of the plug body 2 and the inner surface IS of the pipe P are in close contact with each other, so that the heat of the heating wire 31 is firmly transmitted to both. .

（第２の実施の形態）
図５は、本発明の第２の実施の形態に係る電気融着プラグの断面図である。 (Second embodiment)
FIG. 5 is a sectional view of an electrofusion plug according to a second embodiment of the present invention.

第２の実施の形態に係る電気融着プラグにおいて、第１の実施の形態に係る電気融着プラグと共通する部分については、同一の参照符号を付して説明を省略する。 In the electric fusion plug according to the second embodiment, parts common to the electric fusion plug according to the first embodiment are given the same reference numerals, and the description thereof will be omitted.

図５に示すように、電気融着プラグ１ａは、プラグ本体部２ａと発熱部３とプラグ本体押圧手段４ａとを有している。 As shown in FIG. 5, the electric fusion plug 1a has a plug body portion 2a, a heat generating portion 3, and a plug body pressing means 4a.

プラグ本体部押圧手段４ａは、保持部材４２ａと弾性部材４１と中間部材４３とを有し、プラグ本体部２ａの片側（図５におけるプラグ本体部２ａの左側）の端部に設けられ、プラグ本体部２ａを軸線方向に押圧している。 The plug body pressing means 4a includes a holding member 42a, an elastic member 41, and an intermediate member 43, and is provided at an end of one side of the plug body 2a (the left side of the plug body 2a in FIG. 5). The portion 2a is pressed in the axial direction.

保持部材４２ａは、軸部４２１ａと圧縮部４２２ａとで構成されている。
軸部４２１ａは、弾性部材４１の空洞に通されることが可能な外径の円柱であって、インサート成形によりプラグ本体部２ａに設けられている。軸部４２１ａのプラグ本体部２ａ側の端部には大径部４２３ａが形成されている。大径部４２３aは、インサート成形によりプラグ本体部２ａの内部に埋め込まれている。軸部４２１ａは、大径部がプラグ本体部２ａに引っかかっていることで、プラグ本体部２ａに対して軸線方向に固定されている。 The holding member 42a includes a shaft portion 421a and a compression portion 422a.
The shaft portion 421a is a cylinder having an outer diameter that can be passed through the cavity of the elastic member 41, and is provided in the plug body portion 2a by insert molding. A large diameter portion 423a is formed at the end of the shaft portion 421a on the side of the plug body portion 2a. The large diameter portion 423a is embedded inside the plug body portion 2a by insert molding. The shaft portion 421a is fixed to the plug body portion 2a in the axial direction by having its large diameter portion hooked onto the plug body portion 2a.

また、軸部４２１ａは、プラグ本体部２ａの端部から軸線方向に延びるように設けられ、端部外周におねじ４２４ａが形成されている。軸部４２１ａは、空洞に通されて弾性部材４１を保持し、弾性部材４１は、おねじ４２４ａにナットなどの圧縮部４２２ａをねじ込むことによって圧縮されている。 Further, the shaft portion 421a is provided so as to extend in the axial direction from the end of the plug main body portion 2a, and a thread 424a is formed on the outer periphery of the end. The shaft portion 421a is passed through a cavity and holds the elastic member 41, and the elastic member 41 is compressed by screwing a compression portion 422a such as a nut into the male thread 424a.

（その他の実施の形態）
図１又は図５の電気融着プラグでは、弾性部材４１はプラグ本体部に向かって圧縮されて装着されることで、圧縮と逆方向の力によってプラグ本体部を軸線方向に押圧しているが、本発明において弾性部材の形態はこれに限られない。弾性部材は、引き伸ばした状態でプラグ本体部に装着され、縮もうとする力を使ってプラグ本体部を軸線方向に押圧するものであってもよい。また、弾性部材は、プラグ本体部を軸線方向に押圧可能に設けることができるものであれば、筒状に限られず中実であってもよい。 (Other embodiments)
In the electrofusion plug shown in FIG. 1 or 5, the elastic member 41 is compressed and installed toward the plug body, and presses the plug body in the axial direction with a force in the opposite direction to the compression. However, the form of the elastic member in the present invention is not limited to this. The elastic member may be attached to the plug main body in a stretched state and press the plug main body in the axial direction using the force of the elastic member to contract. Moreover, the elastic member is not limited to a cylindrical shape, but may be solid, as long as it can be provided so as to be able to press the plug main body in the axial direction.

１、１ａ：電気融着プラグ
２、２ａ：プラグ本体部
２１：螺旋溝
２２：本体めねじ
ＯＳ：外面
ＥＦ：端面
３：発熱部
３１：電熱線
３２：コネクタピン
４、４ａ：プラグ本体部押圧手段
４１：弾性部材
４２、４２ａ：保持部材
４２１、４２１ａ：軸部
４２２、４２２ａ：圧縮部
４２３：おねじ
４２３ａ：大径部
４２４ａ：おねじ
４３：中間部材
Ｐ：管
ＩＳ：内面 1, 1a: Electric fusion plug 2, 2a: Plug body 21: Spiral groove 22: Body female thread OS: Outer surface EF: End face 3: Heat generating part 31: Heating wire 32: Connector pin 4, 4a: Plug body press Means 41: Elastic member 42, 42a: Holding member 421, 421a: Shaft portion 422, 422a: Compression portion 423: Male thread 423a: Large diameter portion 424a: Male thread 43: Intermediate member P: Pipe IS: Inner surface

Claims (4)

熱可塑性樹脂で形成されている円柱形状のプラグ本体部と、
前記プラグ本体部の外周部に配置されている発熱部と、
前記プラグ本体部を軸線方向に押圧しているプラグ本体部押圧手段と、を有し、
前記プラグ本体部押圧手段は、
圧縮されることで圧縮方向と逆側の方向に向かって反発する弾性部材と、
前記プラグ本体部に少なくとも一部が固定されており、前記弾性部材を圧縮した状態で保持している保持部材と、を有する、
電気融着プラグ。 A cylindrical plug body made of thermoplastic resin,
a heat generating part disposed on the outer periphery of the plug main body;
a plug body pressing means for pressing the plug body in the axial direction ;
The plug body pressing means includes:
an elastic member that rebounds in a direction opposite to the compression direction when compressed;
a holding member that is at least partially fixed to the plug body and holds the elastic member in a compressed state;
Electric fusion plug. 前記弾性部材は、圧縮される方向に貫通する空洞が形成された筒状であり、
前記保持部材は、
前記プラグ本体部に少なくとも一部が固定され、前記プラグ本体部の端部から軸線方向に延びるように設けられ、前記空洞に通されて前記弾性部材を保持している軸部と、
前記軸部における、前記プラグ本体部の側と逆側の端部に設けられ、前記弾性部材を前記プラグ本体部に向かって圧縮している圧縮部と、を有する、
請求項１に記載の電気融着プラグ。 The elastic member has a cylindrical shape with a cavity penetrating in the direction of compression,
The holding member is
a shaft portion that is at least partially fixed to the plug body portion, is provided to extend in the axial direction from an end of the plug body portion, and is passed through the cavity and holds the elastic member;
a compression part that is provided at an end of the shaft part on a side opposite to the plug main body part and compresses the elastic member toward the plug main body part;
An electrofusion plug according to claim 1 . 前記軸部は、前記プラグ本体部と螺合されて設けられている、
請求項２に記載の電気融着プラグ。 The shaft portion is provided to be screwed together with the plug main body portion,
An electrofusion plug according to claim 2 . 前記軸部は、前記プラグ本体部にインサート成形されて設けられている、
請求項２に記載の電気融着プラグ。 The shaft portion is provided by insert molding in the plug body portion,
An electrofusion plug according to claim 2 .
JP2019114211A 2019-06-20 2019-06-20 electric fusion plug Active JP7361507B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019114211A JP7361507B2 (en) 2019-06-20 2019-06-20 electric fusion plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019114211A JP7361507B2 (en) 2019-06-20 2019-06-20 electric fusion plug

Publications (2)

Publication Number Publication Date
JP2021001618A JP2021001618A (en) 2021-01-07
JP7361507B2 true JP7361507B2 (en) 2023-10-16

Family

ID=73993947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2019114211A Active JP7361507B2 (en) 2019-06-20 2019-06-20 electric fusion plug

Country Status (1)

Country Link
JP (1) JP7361507B2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001082665A (en) 1999-09-16 2001-03-30 Mitsubishi Plastics Ind Ltd Electric fusion type branch pipe joint
JP2001355784A (en) 2000-06-15 2001-12-26 Hitachi Metals Ltd Pipe fixing jig and pipe fixing method for electro-fusion joint
JP2009097657A (en) 2007-10-18 2009-05-07 Hitachi Metals Ltd Electrofusion plug and method for treating pipe end
CN102537571A (en) 2012-01-06 2012-07-04 阴法军 Pipe joint used for connecting polyethylene plastic-steel winding pipes
JP2019173915A (en) 2018-03-29 2019-10-10 日立金属株式会社 Joint member, pipe connector and valve gear

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62279922A (en) * 1986-05-29 1987-12-04 Sekisui Chem Co Ltd Method of lining flanged pipe and lining equipment to be used for that
JPH05278110A (en) * 1992-04-01 1993-10-26 Sekisui Chem Co Ltd Joining method for synthetic resin pipe
JP3265405B2 (en) * 1992-10-09 2002-03-11 東亜高級継手バルブ製造株式会社 Manufacturing method of electrofusion joint
JPH06207698A (en) * 1992-11-17 1994-07-26 Sekisui Chem Co Ltd Pipe line blocking cap
JP3343398B2 (en) * 1993-06-22 2002-11-11 積水化学工業株式会社 Manufacturing method of pipe closing cap
JPH07243577A (en) * 1994-03-08 1995-09-19 Osaka Gas Co Ltd Plugging device for pipe
JPH08187800A (en) * 1995-01-05 1996-07-23 Sekisui Chem Co Ltd Production of cap for closing pipeline
JPH08336892A (en) * 1995-06-12 1996-12-24 Sekisui Chem Co Ltd Die for manufacturing tube joint, manufacture of the joint by using the die and the joint

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001082665A (en) 1999-09-16 2001-03-30 Mitsubishi Plastics Ind Ltd Electric fusion type branch pipe joint
JP2001355784A (en) 2000-06-15 2001-12-26 Hitachi Metals Ltd Pipe fixing jig and pipe fixing method for electro-fusion joint
JP2009097657A (en) 2007-10-18 2009-05-07 Hitachi Metals Ltd Electrofusion plug and method for treating pipe end
CN102537571A (en) 2012-01-06 2012-07-04 阴法军 Pipe joint used for connecting polyethylene plastic-steel winding pipes
JP2019173915A (en) 2018-03-29 2019-10-10 日立金属株式会社 Joint member, pipe connector and valve gear

Also Published As

Publication number Publication date
JP2021001618A (en) 2021-01-07

Similar Documents

Publication Publication Date Title
US4703150A (en) Weldable connecting member for connecting or joining thermoplastic pipe elements
JP7361507B2 (en) electric fusion plug
KR102429702B1 (en) Pipeline comprising a connector as well as a method for operating said pipeline
JP2019501348A (en) Connector with mounting aid and method of forming the connector
KR100880384B1 (en) Coupling structure of plastic pipe for preventing leakage of fluid
US6198081B1 (en) Welding sleeve of thermoplastic material with indicator
JP2562781B2 (en) Resin tube connection structure
JP6987880B2 (en) Heated conduit with plug and how this conduit works
KR102181682B1 (en) Angle pipe adaptor for faucet
JPWO2021149832A5 (en)
JPH04145294A (en) Transfer coupling between resin tube and metal tube
JP2019173915A (en) Joint member, pipe connector and valve gear
JPH045876B2 (en)
JP6904698B2 (en) Branch saddle fitting
JP2003343788A (en) Pipe joint
KR101353507B1 (en) Connecting pipe for electirc fusion
JP2020015226A (en) Method for manufacturing resin tube member
KR200344542Y1 (en) pipe coupler
JP5173571B2 (en) Electrofusion fitting
JP2005214251A (en) Connecting method for resin pipe
JPH071074B2 (en) Pipe fitting
JP5839565B2 (en) Electrical fusion joint fittings and electric fusion joints with joints
JP2676494B2 (en) Electrofusion joint joint fitting retaining method
JPH08145268A (en) Length adjusting coupling for electric fusion
JP3003003B2 (en) Synthetic resin pipe fittings

Legal Events

Date Code Title Description
A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20190624

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20220509

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20220513

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20220527

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20220624

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20230324

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230411

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20230609

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20230804

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20230905

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20231003

R150 Certificate of patent or registration of utility model

Ref document number: 7361507

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150