JPH1113982A - Electrically fused joint provided with clamp - Google Patents
Electrically fused joint provided with clampInfo
- Publication number
- JPH1113982A JPH1113982A JP18463197A JP18463197A JPH1113982A JP H1113982 A JPH1113982 A JP H1113982A JP 18463197 A JP18463197 A JP 18463197A JP 18463197 A JP18463197 A JP 18463197A JP H1113982 A JPH1113982 A JP H1113982A
- Authority
- JP
- Japan
- Prior art keywords
- joint
- tapered
- fixed body
- ring portion
- peripheral surface
- 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.)
- Pending
Links
Landscapes
- Branch Pipes, Bends, And The Like (AREA)
- Surface Heating Bodies (AREA)
- Joints With Pressure Members (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、熱可塑性樹脂管と
電気融着させる電気融着継手に関し、更に詳しくは、熱
可塑性樹脂製継手本体と剛性のある樹脂で形成した固定
体とからなり、この継手本体の継手内面に電気発熱素子
を埋設し、熱可塑性樹脂管と電気融着する電気融着継手
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-fusion joint for electro-fusion with a thermoplastic resin pipe, and more particularly, to a joint body made of a thermoplastic resin and a fixed body formed of a rigid resin. The present invention relates to an electric fusion joint in which an electric heating element is buried in a joint inner surface of the joint main body and is electrically fused to a thermoplastic resin pipe.
【0002】[0002]
【従来の技術】熱可塑性樹脂管と接続する管継手には種
々のものがあるが、継手内面にニクロム線の如き電気発
熱素子を埋設してこれに熱可塑性樹脂管を挿入し、電気
発熱素子に通電し発熱させて継手と管とを融着させる電
気融着継手が広く用いられている。2. Description of the Related Art There are various types of pipe joints to be connected to a thermoplastic resin pipe. An electric heating element such as a nichrome wire is buried in a joint inner surface, and a thermoplastic resin pipe is inserted into this. An electric fusion joint is widely used in which an electric current is applied to the joint to generate heat to fuse the joint to the pipe.
【0003】しかし、熱可塑性樹脂管の接続端部の外径
寸法には当然許容される誤差があり、このため電気融着
継手の継手内面の内径寸法は大き目に決められ、更にこ
の寸法に加工許容差が加えられる。このため、電気融着
継手に樹脂管を挿入した時に管と継手との間に隙間を生
じて、管と継手とが同軸に保たれなかったり、軸線方向
の位置決めが不確かになったりする。However, there is naturally an allowable error in the outer diameter of the connection end of the thermoplastic resin pipe, and therefore the inner diameter of the inner surface of the joint of the electrofusion joint is determined to be large, and further processed to this size. Tolerance is added. For this reason, when the resin tube is inserted into the electrofusion joint, a gap is generated between the tube and the joint, and the tube and the joint are not kept coaxial or the positioning in the axial direction is uncertain.
【0004】この状態で電気発熱素子に通電して電気融
着継手の継手内面とこれに面する樹脂管の外面を加熱溶
融させた時に、継手内面と樹脂管の外面との間の隙間が
不均等であるために樹脂管の外面での溶融が不均一にな
り、溶融樹脂が冷却固化する時に融着不良部を生じるこ
とがある。また、溶融樹脂が結晶化温度以下に冷却され
る前に継手や樹脂管が溶融樹脂の圧力や外力によって移
動して、接続界面が動いて強固に融着接続させることが
できないこともある。In this state, when the electric heating element is energized to heat and melt the inner surface of the joint of the electrofusion joint and the outer surface of the resin tube facing the same, there is no gap between the inner surface of the joint and the outer surface of the resin tube. Due to the uniformity, the melting on the outer surface of the resin tube becomes uneven, and a defective fusion portion may be generated when the molten resin is cooled and solidified. Further, before the molten resin is cooled to a temperature lower than the crystallization temperature, the joint or the resin pipe may move due to the pressure or external force of the molten resin, and the connection interface may move to make it impossible to perform a firm fusion connection.
【0005】このような融着不良を防ぐために、図5に
示したような融着作業用の工具31を用いて融作するこ
とが多い。図5において、32は電気融着継手、33及
び34は熱可塑性樹脂管である。[0005] In order to prevent such defective fusion, fusion is often performed by using a fusion tool 31 as shown in FIG. In FIG. 5, reference numeral 32 denotes an electric fusion joint, and reference numerals 33 and 34 denote thermoplastic resin tubes.
【0006】上記のような融着作業用工具は、次に述べ
るように多くの課題を有しているので、特開平6−26
5083号公報や特開平7−251456号公報に示さ
れたように、電気融着継手の接続端において継手内径と
樹脂管の外面との間にくさびを挿入して電気融着継手に
樹脂管を固定する方法や、特開平7−329186号公
報に示されたように、電気融着継手の内周面にめねじを
設け、これに樹脂管の先端に加工したおねじをねじ込ん
で電気融着継手に樹脂管を固定する方法などが提案され
ている。[0006] The fusing tool described above has many problems as described below.
As shown in JP-A-5083 and JP-A-7-251456, a wedge is inserted between the joint inner diameter and the outer surface of the resin tube at the connection end of the electric fusion joint to insert the resin tube into the electric fusion joint. As shown in the fixing method and Japanese Patent Application Laid-Open No. 7-329186, a female screw is provided on the inner peripheral surface of the electric fusion joint, and a male screw processed at the tip of the resin pipe is screwed into the female screw to perform electric fusion. A method of fixing a resin pipe to a joint has been proposed.
【0007】[0007]
【発明が解決しようとする課題】上述したように融着不
良を防ぐために図5に示したような融着作業用の工具3
1を用いる場合には、これらの工具を樹脂管のサイズご
とにそれぞれ準備する必要がある。また、充分な接着強
度が得られる結晶化温度以下にまで冷却するのに可成り
の時間を要し、この間この融着作業用の工具を樹脂管か
ら取外すことができないので、次の工程に進めなくな
る。このために、樹脂管の同じサイズに対して複数個の
工具を準備しておく必要がある。したがって、この融着
作業用の工具を用いる方法は経費高になる。As described above, in order to prevent defective fusion, a tool 3 for fusion work as shown in FIG.
When using No. 1, it is necessary to prepare these tools for each size of the resin pipe. Also, it takes a considerable amount of time to cool to a temperature below the crystallization temperature at which sufficient adhesive strength can be obtained, and during this time, the tool for the fusion work cannot be removed from the resin pipe, so proceed to the next step. Disappears. For this purpose, it is necessary to prepare a plurality of tools for the same size of the resin pipe. Therefore, the method using the welding tool is expensive.
【0008】更に、この融着作業用の工具を用いる方法
は、狭い作業空間で使用するのに不便であり、取付け作
業に工数を要するだけでなく、冷却後の工具回収にも手
間がかかり、配管作業に多くの工数が必要になる。Further, the method using the welding tool is inconvenient to use in a narrow working space, not only requires a lot of man-hours for mounting work, but also takes time and effort to collect the tool after cooling. Many man-hours are required for piping work.
【0009】次に、特開平6−265083号公報や特
開平7−251456号公報に示されたような、電気融
着継手の接続端において継手内径と樹脂管の外面との間
にくさびを挿入して電気融着継手に樹脂管を固定する方
法では、前者では、くさびとしてテーパ状のスティフナ
ー部を有する抜け止め部材を用いており、この抜け止め
部材が特異な形状のもので高価なものである。また、後
者では同一の円周部に複数個のくさびを個々に打込んで
挿入するようになっており、電気融着継手と樹脂管との
間の隙間が均一になるように複数個のくさびを挿入する
ことは、極めて厄介な作業であり、特に狭隘な作業空間
では至難なことである。Next, as shown in JP-A-6-265083 and JP-A-7-251456, a wedge is inserted between the inner diameter of the joint and the outer surface of the resin pipe at the connection end of the electric fusion joint. In the method of fixing the resin tube to the electric fusion joint, the former uses a retaining member having a tapered stiffener portion as a wedge, and the retaining member has a peculiar shape and is expensive. is there. Also, in the latter, a plurality of wedges are individually driven and inserted into the same circumferential portion, and a plurality of wedges are formed so that a gap between the electric fusion joint and the resin pipe is uniform. Is a very cumbersome task, especially in confined workspaces.
【0010】また、特開平7−329186号公報に示
されたような、電気融着継手の内周面にめねじを設け、
これに樹脂管の先端に加工したおねじをねじ込んで電気
融着継手に樹脂管を固定する方法では、配管現場に応じ
た長さに樹脂管を切断した後におねじの加工を行わなけ
ればならず、それだけ現場での作業が厄介になる。[0010] Further, as shown in JP-A-7-329186, a female screw is provided on the inner peripheral surface of the electrofusion joint,
In the method of fixing the resin pipe to the electric fusion joint by screwing the male thread processed at the tip of the resin pipe into this, the male thread must be processed after cutting the resin pipe to the length according to the piping site Not only that, work on site becomes troublesome.
【0011】本発明が解決しようとする課題は、従来の
様々な電気融着継手を用いて樹脂管と電気融着接続を行
う場合の、上述したような様々な問題点である。The problem to be solved by the present invention is the above-mentioned various problems when performing electric fusion splicing with a resin pipe using various conventional electric fusion joints.
【0012】[0012]
【課題を解決するための手段】本発明は、上記の目的を
達成するためになされたものであって、熱可塑性樹脂製
継手本体の継手内面に電気発熱素子を埋設し、この継手
本体に挿入した熱可塑性樹脂管と電気融着接続する電気
融着継手において、この継手本体の端部の外周面にはお
ねじを、内周面には内方に向かって細くなるテーパ内面
を形成し、このおねじと螺合するめねじを形成した外環
部とこのテーパ内面に接面するテーパ外面と前記樹脂管
を挿入する内周面とを形成した内環部とを有する剛性樹
脂で形成した固定体を、そのめねじを前記おねじに螺合
させてねじ込み、前記両テーパ面によって前記内環部の
内周面を挿入した樹脂管の外面に圧接させて樹脂管を固
定するようにした。SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and has an electric heating element embedded in a joint inner surface of a thermoplastic resin joint body and inserted into the joint body. In the electrofusion joint to be electrofused with the thermoplastic resin pipe, a male screw is formed on an outer peripheral surface of an end portion of the joint body, and a tapered inner surface which becomes thinner inward is formed on an inner peripheral surface. A fixed body formed of a rigid resin having an outer ring portion formed with a female thread to be screwed with a male screw, an inner ring portion formed with a tapered outer surface in contact with the tapered inner surface, and an inner peripheral surface into which the resin tube is inserted. The female thread is screwed into the male thread and screwed in, and the inner peripheral surface of the inner ring portion is pressed against the outer surface of the inserted resin pipe by the two tapered surfaces to fix the resin pipe.
【0013】この場合、上記の固定体の内環部の軸線方
向と平行に先端方向に向かって切り開いた放射状の切割
り溝を、周方向にほぼ等分に離して複数個設けるとよ
い。また、上記の継手本体のテーパ内面及び上記の固定
体の内環部のテーパ外面をそれぞれテーパ角度を変えた
2つのテーパ面で構成し、この内環部先端部のテーパ角
度をその奥側のテーパ角度よりも大きくし、これらのテ
ーパ内面とテーパ外面とは上記のテーパ角度が小さい方
が先に接面するように構成するとよい。In this case, it is preferable to provide a plurality of radial cutting grooves which are opened in the distal direction in parallel with the axial direction of the inner ring portion of the above-mentioned fixed body and are substantially equally spaced in the circumferential direction. In addition, the tapered inner surface of the joint body and the tapered outer surface of the inner ring portion of the fixed body are formed of two tapered surfaces with different taper angles, and the taper angle of the inner ring portion distal end is set to the far side. It is preferable that the taper angle is larger than the taper angle, and that the taper inner surface and the taper outer surface are in contact with each other at the smaller taper angle.
【0014】更に、上記の固定体の内周面に断面がほぼ
三角形又は台形の筋状の突起をこの固定体の軸線方向と
平行に又は傾斜させてあるいは円周状に複数個設けると
よい。また、上記の固定体の外環部の外周面に断面がほ
ぼ長方形又は台形の突部又は溝をこの固定体の軸線方向
と平行に複数個設けるとよい。Further, it is preferable that a plurality of streak-like projections having a substantially triangular or trapezoidal cross section are provided on the inner peripheral surface of the fixed body in parallel with or inclined to the axial direction of the fixed body, or circumferentially. Further, a plurality of projections or grooves having a substantially rectangular or trapezoidal cross section may be provided on the outer peripheral surface of the outer ring portion of the fixed body in parallel with the axial direction of the fixed body.
【0015】上記のように構成したので、先ず、熱可塑
性樹脂製継手本体の外周面のおねじに剛性のある樹脂で
形成した固定体の外環部のめねじを螺合させて、継手本
体に固定体が組付けてあるこのクランプ付電気融着継手
に、固定体を僅か緩めた状態で熱可塑性樹脂管を挿入
し、固定体をねじ込むと、固定体の内環部のテーパ外面
が継手本体の端部の内周面のテーパ内面に接面し、固定
体を更にねじ込むと、接面している両テーパ面の作用よ
って固定体の内環部が縮径するように変形してその内周
面が挿入してある樹脂管の外面を強圧し、樹脂管をこの
電気融着継手に固定させる。[0015] With the above structure, first, the female screw of the outer ring portion of the fixed body formed of a rigid resin is screwed into the external thread of the outer peripheral surface of the thermoplastic resin joint main body. When a thermoplastic resin tube is inserted into this electrofusion joint with clamp, which has a fixed body attached to it, with the fixed body slightly loosened, and the fixed body is screwed in, the tapered outer surface of the inner ring of the fixed body becomes a joint. When the fixed body is further screwed in contact with the tapered inner surface of the inner peripheral surface at the end of the main body, the inner ring portion of the fixed body is deformed to reduce the diameter by the action of the two tapered surfaces that are in contact with each other. The outer surface of the resin tube into which the inner peripheral surface is inserted is strongly pressed to fix the resin tube to the electrofusion joint.
【0016】この場合、固定体の内環部は当然継手本体
と同じ状態で縮径するので、継手本体と樹脂管とは同心
に固定される。この状態で継手本体の継手内面に埋設し
てある電気発熱素子に通電して発熱させると、熱可塑性
樹脂製継手本体のこの継手内面と対面する熱可塑性樹脂
管の外面が溶融する。通電を止めて放熱させ冷却させる
と、溶融した樹脂が結晶化温度以下で結晶化し固定し
て、継手本体と管とを強固に接続させる。そして、この
両者は固定体によって同心に固定されていたので、両者
の間での樹脂の溶融固化が均一であり、両者の間に移動
がないので欠陥なく固化し、継手と管とが同心に確実強
固に融着接続される。In this case, since the inner ring portion of the fixed body is reduced in diameter in the same state as the joint body, the joint body and the resin pipe are fixed concentrically. In this state, when an electric heating element embedded in the inner surface of the joint of the joint body is energized to generate heat, the outer surface of the thermoplastic resin pipe facing the inner surface of the joint of the thermoplastic resin joint body is melted. When the power is turned off and heat is released and cooled, the molten resin crystallizes and is fixed below the crystallization temperature, and the joint body and the pipe are firmly connected. And since both were fixed concentrically by the fixed body, the melting and solidification of the resin between the two was uniform, and there was no movement between the two, so they solidified without defects, and the joint and the pipe were concentric. It is surely fusion spliced.
【0017】また、固定体の内環部には周方向にほぼ等
分に離して複数個の切割り溝が設けてあるので、固定体
を継手本体にねじ込んだ時に、固定体の内環部は両テー
パ面の作用によって極めて容易に縮径することができ
る。Further, since the inner ring portion of the fixed body is provided with a plurality of split grooves substantially equally spaced in the circumferential direction, when the fixed body is screwed into the joint body, the inner ring portion of the fixed body is formed. Can be very easily reduced in diameter by the action of both tapered surfaces.
【0018】継手本体のテーパ内面と固定体の内環部の
テーパ外面との接面は、最初にテーパ角度が小さい内環
部の奥側において生じ、固定体を継手本体にねじ込むこ
とによるこの両テーパ面の作用によって内環部を縮径さ
せて、通常の外径寸法の樹脂管の外面を固定体の内環部
の内周面が強圧して、継手本体に樹脂管を固定させる。The contact surface between the tapered inner surface of the joint main body and the tapered outer surface of the inner ring portion of the fixed body first occurs on the inner side of the inner ring portion having a small taper angle, and these two surfaces are formed by screwing the fixed body into the joint body. The inner ring portion is reduced in diameter by the action of the tapered surface, and the outer peripheral surface of the resin tube having a normal outer diameter is strongly pressed against the inner peripheral surface of the inner ring portion of the fixed body, thereby fixing the resin tube to the joint body.
【0019】しかし、外径寸法が比較的小さい樹脂管に
おいては、上記のテーパ角度が小さい両テーパ面の作用
による内環部の縮径では継手本体に樹脂管を固定させる
に到らない場合がある。この場合には、固定体を更に継
手本体にねじ込んで、テーパ角度が大きい内環部の先端
部においてそのテーパ外面を継手本体のテーパ内面に接
面させて内環部を縮径させると、テーパ角度が大きいた
めに縮径度も大きく、外径寸法が比較的小さい樹脂管
も、大きく縮径した内環部によって継手本体に確実に固
定される。However, in the case of a resin pipe having a relatively small outer diameter, it may not be possible to fix the resin pipe to the joint body by reducing the diameter of the inner ring portion due to the action of the two tapered surfaces having a small taper angle. is there. In this case, when the fixed body is further screwed into the joint body, and the tapered outer surface is brought into contact with the tapered inner surface of the joint body at the distal end portion of the inner ring portion having a large taper angle, the inner ring portion is reduced in diameter. Due to the large angle, the degree of diameter reduction is large, and the resin pipe having a relatively small outer diameter is also reliably fixed to the joint body by the inner ring part whose diameter is greatly reduced.
【0020】固定体の内周面にに設けた複数個の断面が
ほぼ三角形又は台形の筋状の突起は、固定体をねじ込ん
で樹脂管と継手とを固定する以前でも、樹脂管を支えて
樹脂管と継手とをほぼ同心に配置させるためのもので、
外径寸法が比較的大きい樹脂管を接続する場合には、樹
脂管が挿入される時に、筋状の突起の阻害する部分が、
その体積は比較的小さいので、挿入される樹脂管によっ
て容易に破砕される。The plurality of stripe-like projections having a substantially triangular or trapezoidal cross section provided on the inner peripheral surface of the fixed body support the resin pipe even before the fixed body is screwed to fix the resin pipe and the joint. For arranging the resin pipe and the joint almost concentrically,
When connecting a resin tube with a relatively large outer diameter, when the resin tube is inserted, the portion where the streak-like projections hinder
Since its volume is relatively small, it is easily crushed by the inserted resin tube.
【0021】なお、固定体の外環部の外周面に断面がほ
ぼ長方形又は台形の突部又は溝を設けたので、これに工
具を掛けて、固定体を継手本体に容易にねじ込むことが
できる。Since the outer peripheral surface of the outer ring portion of the fixed body is provided with a projection or groove having a substantially rectangular or trapezoidal cross section, the fixed body can be easily screwed into the joint body by using a tool. .
【0022】[0022]
【発明の実施の形態】次に、本発明の実施形態を説明す
る。図1は、本発明のクランプ付電気融着継手の一実施
形態を示す部分縦断面図であって、この継手に樹脂管を
挿入した状態を示している。図2は図1の拡大部分縦断
面図であり、図3は図1に示した固定体の斜視外観図で
ある。また、図4は、図1に示した継手の樹脂管を挿入
してない状態を示す部分縦断面図である。Next, an embodiment of the present invention will be described. FIG. 1 is a partial longitudinal sectional view showing one embodiment of an electrofusion joint with a clamp of the present invention, and shows a state where a resin pipe is inserted into the joint. 2 is an enlarged partial longitudinal sectional view of FIG. 1, and FIG. 3 is a perspective external view of the fixed body shown in FIG. FIG. 4 is a partial longitudinal sectional view showing a state where the resin pipe of the joint shown in FIG. 1 is not inserted.
【0023】図1乃至図4において、1はクランプ付電
気融着継手、2は熱可塑性樹脂製の継手本体であって、
これの継手内面3には電気発熱素子4が埋設してあり、
5はその接続端子である。継手本体2の端部6の外周面
にはおねじ7が、内周面には内方に向かって細くなるテ
ーパ内面8が形成されている。なお、このテーパ内面8
は、図2において8a及び8bで示したテーパ角度が異
なる2つのテーパ内面で構成されており、テーパ内面8
aのテーパ内面αはテーパ内面8bのテーパ角度βより
も小さくなっている。1 to 4, reference numeral 1 denotes an electrofusion joint with a clamp, and 2 denotes a joint body made of a thermoplastic resin.
An electric heating element 4 is embedded in the inner surface 3 of the joint.
5 is the connection terminal. A male screw 7 is formed on the outer peripheral surface of the end portion 6 of the joint main body 2, and a tapered inner surface 8 tapering inward is formed on the inner peripheral surface. The tapered inner surface 8
Is composed of two tapered inner surfaces having different taper angles indicated by 8a and 8b in FIG.
The taper inner surface α of a is smaller than the taper angle β of the taper inner surface 8b.
【0024】9は固定体であって、その外環部10には
継手本体2のおねじ7に螺合するめねじ11が形成され
ており、内環部12には継手本体2のテーパ内面8に接
面するテーパ外面13が形成されている。なお、このテ
ーパ外面13も2つのテーパ外面13aと13bとで構
成されており、それぞれのテーパ角度は、上記のテーパ
内面8a、8bと同じくαとβである。ただし、テーパ
内面8aとテーパ外面13aとの接面がテーパ内面8b
とテーパ外面13bとの接面よりも先に接触する。Reference numeral 9 denotes a fixed body. The outer ring 10 has a female screw 11 screwed to the external thread 7 of the joint body 2, and the inner ring 12 has a tapered inner surface 8 of the joint body 2. The tapered outer surface 13 is formed in contact with the outer surface. The tapered outer surface 13 is also composed of two tapered outer surfaces 13a and 13b, and the respective taper angles are α and β, similarly to the tapered inner surfaces 8a and 8b. However, the contact surface between the tapered inner surface 8a and the tapered outer surface 13a is the tapered inner surface 8b.
And comes into contact before the contact surface with the tapered outer surface 13b.
【0025】また、固定体9の内環部12に、図3に示
したように、軸線方向に平行で先端14の方向に切り開
いた放射状の切割り溝15を、周方向にほぼ等分に離し
て複数個(図3に示した固定体9では4個)設けてあ
る。Further, as shown in FIG. 3, a radial cutting groove 15 which is parallel to the axial direction and is opened in the direction of the tip 14 is formed on the inner ring portion 12 of the fixed body 9 in the circumferential direction at substantially equal intervals. A plurality of them (four in the fixed body 9 shown in FIG. 3) are provided apart from each other.
【0026】更に、固定体9には、図4に示したよう
に、内周面16に断面がほぼ三角形の筋状の突起17が
軸線方向に複数個(図4に示した例では4個)設けてあ
り、固定体9の外環部10の外周面18に断面がほぼ長
方形の突部19が図3に示したように設けてある。Further, as shown in FIG. 4, the fixed body 9 has a plurality of stripe-shaped projections 17 having a substantially triangular cross section on the inner peripheral surface 16 in the axial direction (four in the example shown in FIG. 4). A projection 19 having a substantially rectangular cross section is provided on the outer peripheral surface 18 of the outer ring portion 10 of the fixed body 9 as shown in FIG.
【0027】次に、図1乃至図4に示した上述の実施形
態について、その作用を説明する。継手本体2の外周面
18のおねじ7に固定体9のめねじ11を螺合させて、
継手本体2に固定体9が組付けてあり、図1及び図2に
示したように固定体9を僅か緩めた状態で熱可塑性樹脂
管20を挿入し、固定体9をねじ込むと、固定体9の内
環部12のテーパ外面13が継手本体2のテーパ内面8
に接面し、固定体9を更にねじ込むと、接面している1
3と8の両テーパ面の作用によって、固定体9の内環部
12が縮径するように変形して、その内周面16が挿入
してある樹脂管20の外面を強圧し、樹脂管20をこの
電気融着継手1に固定させる。Next, the operation of the above-described embodiment shown in FIGS. 1 to 4 will be described. The female thread 11 of the fixed body 9 is screwed into the external thread 7 of the outer peripheral surface 18 of the joint body 2,
A fixed body 9 is attached to the joint body 2. As shown in FIGS. 1 and 2, the thermoplastic resin pipe 20 is inserted in a state where the fixed body 9 is slightly loosened, and the fixed body 9 is screwed. 9 is the tapered inner surface 8 of the joint body 2
When the fixing body 9 is further screwed in,
Due to the action of both the tapered surfaces 3 and 8, the inner ring portion 12 of the fixed body 9 is deformed so as to reduce the diameter, and the inner peripheral surface 16 strongly presses the outer surface of the resin tube 20 into which the resin tube is inserted. 20 is fixed to the electrofusion joint 1.
【0028】この場合、固定体9の内環部12は継手本
体2と同心状態で縮径するので、継手本体2と樹脂管2
0とは全く同心に固定される。この状態で継手本体2の
継手内面3に埋設してある電気発熱素子4に通電して発
熱させると、熱可塑性樹脂製の継手本体2のこの継手内
面3とこれに対面する熱可塑性樹脂管20の外面21が
溶融する。In this case, the diameter of the inner ring portion 12 of the fixed body 9 is reduced concentrically with the joint body 2, so that the joint body 2 and the resin pipe 2
Zero is fixed concentrically. In this state, when the electric heating element 4 embedded in the joint inner surface 3 of the joint body 2 is energized to generate heat, the joint inner surface 3 of the joint body 2 made of thermoplastic resin and the thermoplastic resin pipe 20 facing the joint inner surface 3 Is melted.
【0029】通電を止めて放熱させ冷却させると、溶融
した樹脂が結晶化温度以下で結晶化し固化して、継手本
体2と樹脂管20とを強固に接続させる。そして、この
両者は固定体9によって全く同心に固定されていたの
で、両者の間での樹脂の溶融固化が均一であり、両者の
間の移動がないので欠陥なく固化し、継手1と管20と
が同心に確実強固に融着接続される。When the power is turned off and the heat is released and cooled, the molten resin crystallizes and solidifies at a temperature lower than the crystallization temperature, and the joint body 2 and the resin pipe 20 are firmly connected. Since the two are completely concentrically fixed by the fixing body 9, the resin is solidified and melted and solidified uniformly between the two. Are firmly and fusion-bonded concentrically.
【0030】固定体9の内環部12には複数個の切割り
溝15が設けてあるので、固定体9を継手本体2にねじ
込んだときに、固定体9の内環部12はテーパ面8と1
3の作用によって極めて容易に縮径することができる。The inner ring 12 of the fixed body 9 is provided with a plurality of split grooves 15, so that when the fixed body 9 is screwed into the joint body 2, the inner ring 12 of the fixed body 9 is tapered. 8 and 1
By the action of 3, the diameter can be reduced very easily.
【0031】上述のテーパ内面8とテーパ外面13との
接面は、先にテーパ角度αが小さいテーパ内面8aとテ
ーパ外面13aとにおいて生じ、固定体9を継手本体2
にねじ込むことによるこの両テーパ面8aと13aとの
作用によって内環部12を縮径させて、通常の外径寸法
の樹脂管20の外面21を固定体9の内周面16が強圧
して、継手本体2に樹脂管20を固定させる。The above-mentioned contact surface between the tapered inner surface 8 and the tapered outer surface 13 is first formed at the tapered inner surface 8a and the tapered outer surface 13a having a small taper angle α.
The inner ring portion 12 is reduced in diameter by the action of the two tapered surfaces 8a and 13a by screwing into the inner surface, and the inner peripheral surface 16 of the fixed body 9 is strongly pressed against the outer surface 21 of the resin tube 20 having a normal outer diameter. Then, the resin pipe 20 is fixed to the joint body 2.
【0032】しかし、外径寸法が比較的小さい樹脂管2
0においては、上記のテーパ角度αが小さい両テーパ面
8aと13aとの作用による内環部12の縮径では継手
本体2に樹脂管20を固定させるに到らない場合がる。
この場合には、固定体9を更に継手本体2にねじ込ん
で、テーパ角度βが大きいテーパ外面13bをテーパ内
面8bに接面させて内環部12を縮径させると、テーパ
角度βが大きいために縮径度も大きく、外径寸法が比較
的小さい樹脂管20も、大きく縮径した内環部12によ
って継手本体2に確実に固定される。However, the resin tube 2 whose outer diameter is relatively small
At 0, the diameter of the inner ring portion 12 due to the action of the two tapered surfaces 8a and 13a having a small taper angle α may not be enough to fix the resin pipe 20 to the joint body 2.
In this case, if the fixed body 9 is further screwed into the joint body 2 and the tapered outer surface 13b having a large taper angle β is brought into contact with the tapered inner surface 8b to reduce the diameter of the inner ring portion 12, the taper angle β is large. The resin tube 20 having a large diameter reduction and a relatively small outer diameter is also securely fixed to the joint body 2 by the inner ring 12 having a large diameter reduction.
【0033】固定体9の内周面16に設けた複数個の筋
状の突起17は、固定体9をねじ込んで樹脂管20と継
手1とを固定する以前でも、樹脂管20を支えて樹脂管
20と継手1とをほぼ同心に配置させるためのもので、
外径寸法が比較的大きい樹脂管20を接続する場合に
は、樹脂管20が挿入される時に、筋状の突起17の阻
害する部分が、その体積は比較的小さいので、挿入され
る樹脂管20によって容易に破砕される。The plurality of strip-shaped projections 17 provided on the inner peripheral surface 16 of the fixed body 9 support the resin pipe 20 even before the fixed body 9 is screwed to fix the resin pipe 20 and the joint 1. For arranging the pipe 20 and the joint 1 almost concentrically,
When the resin pipe 20 having a relatively large outer diameter is connected, a portion of the hindrance of the streak-like projection 17 is relatively small when the resin pipe 20 is inserted. 20 for easy crushing.
【0034】固定体9の外環部10の外周面18に突部
19を設けたので、これに工具を掛けて、固定体9を継
手本体2に容易にねじ込むことができる。Since the projection 19 is provided on the outer peripheral surface 18 of the outer ring portion 10 of the fixed body 9, the fixed body 9 can be easily screwed into the joint body 2 by using a tool.
【0035】[0035]
【発明の効果】本発明のクランプ付電気融着継手は、樹
脂管をこの継手に挿入した時にすでに両者がほぼ同心に
なり、両者を容易に確実に同心状態に固定することがで
き、したがって融着は確実強固なものになる。しかも、
この固定に特別の固定用の工具やくさび状の抜け止め部
材を必要としないもので、狭い作業空間でも作業が容易
であり、樹脂管にねじなどの加工をする必要もないの
で、作業工数が少なくてすみ、極めて経済的である。According to the electrofusion joint with a clamp of the present invention, when the resin tube is inserted into the joint, the two are already almost concentric, and the two can be easily and reliably fixed in the concentric state. Wearing will surely be strong. Moreover,
This fixation does not require special fixing tools or wedge-shaped retaining members.It is easy to work even in a narrow work space, and there is no need to process screws or the like on the resin pipe, which reduces the number of work steps. It requires less and is extremely economical.
【図1】本発明のクランプ付電気融着継手の一実施形態
を示す部分縦断面図である。FIG. 1 is a partial longitudinal sectional view showing one embodiment of an electrofusion joint with a clamp of the present invention.
【図2】図1の拡大部分縦断面図である。FIG. 2 is an enlarged partial longitudinal sectional view of FIG.
【図3】図1に示した固定体の斜視外観図である。FIG. 3 is a perspective external view of the fixed body shown in FIG. 1;
【図4】図1に示した継手の樹脂管が挿入してない状態
を示す部分縦断面図である。FIG. 4 is a partial longitudinal sectional view showing a state where a resin pipe of the joint shown in FIG. 1 is not inserted.
【図5】融着作業用の工具を用いて継手と樹脂管とを固
定した状態を示す斜視外観図である。FIG. 5 is a perspective external view showing a state in which the joint and the resin pipe are fixed by using a welding tool.
1 クランプ付電気融着継手 2 継手本体 3 継手内面 4 電気発熱素子 6 端部 7 おねじ 8、8a、8b テーパ内面 9 固定体 10 外環部 11 めねじ 12 内環部 13、13a、13b テーパ外面 14 先端 15 切割り溝 16 内周面 17 筋状の突起 18 外周面 19 突部 20 樹脂管 21 外面 DESCRIPTION OF SYMBOLS 1 Electric fusion joint with clamp 2 Joint main body 3 Joint inner surface 4 Electric heating element 6 End part 7 Male thread 8, 8a, 8b Tapered inner surface 9 Fixed body 10 Outer ring part 11 Female thread 12 Inner ring part 13, 13a, 13b Taper Outer surface 14 Tip 15 Cut groove 16 Inner peripheral surface 17 Streak-like projection 18 Outer peripheral surface 19 Projection 20 Resin tube 21 Outer surface
Claims (5)
気発熱素子を埋設し、この継手本体に挿入した熱可塑性
樹脂管と電気融着接続する電気融着継手において、この
継手本体の端部の外周面にはおねじを、内周面には内方
に向かって細くなるテーパ内面を形成し、このおねじと
螺合するめねじを形成した外環部とこのテーパ内面に接
面するテーパ外面と前記樹脂管を挿入する内周面とを形
成した内環部とを有する剛性樹脂で形成した固定体を、
そのめねじを前記おねじに螺合させてねじ込み、前記両
テーパ面によって前記内環部の内周面を挿入した樹脂管
の外面に圧接させて樹脂管を固定するようにしたことを
特徴とするクランプ付電気融着継手。1. An end portion of a joint body made of a thermoplastic resin, wherein an electric heating element is embedded in an inner surface of the joint body made of a thermoplastic resin, and is electrically fused to a thermoplastic resin tube inserted into the joint body. An external thread is formed on the outer peripheral surface, and an inner peripheral surface is formed with a tapered inner surface that becomes thinner inward, and an outer ring portion formed with a female screw that is screwed with the external thread and a tapered outer surface that comes into contact with the tapered inner surface And a fixed body formed of a rigid resin having an inner ring portion formed with an inner peripheral surface into which the resin tube is inserted,
The female screw is screwed into the male screw and screwed in, and the inner peripheral surface of the inner ring portion is pressed against the outer surface of the inserted resin tube by the both tapered surfaces to fix the resin tube. Electrofusion joint with clamp.
に先端方向に向かって切り開いた放射状の切割り溝を、
周方向にほぼ等分に離して複数個設けた請求項1に記載
のクランプ付電気融着継手。2. A radial split groove which is opened in a tip direction parallel to an axial direction of an inner ring portion of the fixed body,
2. The electrofusion joint with clamp according to claim 1, wherein a plurality of the joints are provided at substantially equal intervals in a circumferential direction.
固定体の内環部のテーパ外面をそれぞれテーパ角度を変
えた2つのテーパ面で構成し、この内環部先端部のテー
パ角度をその奥側のテーパ角度よりも大きくし、これら
のテーパ内面とテーパ外面とは上記のテーパ角度が小さ
い方が先に接面するように構成した請求項1又は2に記
載のクランプ付電気融着継手。3. The tapered inner surface of the joint body and the tapered outer surface of the inner ring portion of the fixed body are each formed of two tapered surfaces having different taper angles, and the taper angle of the tip portion of the inner ring portion is adjusted. The electrofusion joint with a clamp according to claim 1 or 2, wherein the taper angle is larger than the taper angle on the back side, and the tapered inner surface and the tapered outer surface are configured such that the smaller taper angle comes in contact with the tapered inner surface first. .
形又は台形の筋状の突起をこの固定体の軸線方向と平行
に又は傾斜させてあるいは円周状に複数個設けた請求項
1乃至3に記載のクランプ付電気融着継手。4. A plurality of streak-like projections having a substantially triangular or trapezoidal cross section are provided on the inner peripheral surface of the fixed body in parallel with or inclined to the axial direction of the fixed body, or circumferentially. An electric fusion joint with a clamp according to any one of claims 1 to 3.
ほぼ長方形又は台形の突部又は溝をこの固定体の軸線方
向と平行に複数個設けた請求項1乃至4に記載のクラン
プ付電気融着継手。5. The fixed body according to claim 1, wherein a plurality of projections or grooves having a substantially rectangular or trapezoidal cross section are provided on an outer peripheral surface of an outer ring portion of the fixed body in parallel with an axial direction of the fixed body. Electric fusion joint with clamp.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18463197A JPH1113982A (en) | 1997-06-26 | 1997-06-26 | Electrically fused joint provided with clamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18463197A JPH1113982A (en) | 1997-06-26 | 1997-06-26 | Electrically fused joint provided with clamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1113982A true JPH1113982A (en) | 1999-01-22 |
Family
ID=16156617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18463197A Pending JPH1113982A (en) | 1997-06-26 | 1997-06-26 | Electrically fused joint provided with clamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1113982A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100688997B1 (en) * | 2006-02-06 | 2007-03-08 | 주식회사 태일 | Fitting for electric fusion with pressing device using screw |
KR100746980B1 (en) * | 2007-01-29 | 2007-08-07 | 주식회사 태일 | Electric fusion piping materials with screw pressing device |
WO2007091799A1 (en) * | 2006-02-06 | 2007-08-16 | Taeil Co., Ltd. | Electric fusion piping materials with screw pressing device |
-
1997
- 1997-06-26 JP JP18463197A patent/JPH1113982A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100688997B1 (en) * | 2006-02-06 | 2007-03-08 | 주식회사 태일 | Fitting for electric fusion with pressing device using screw |
WO2007091799A1 (en) * | 2006-02-06 | 2007-08-16 | Taeil Co., Ltd. | Electric fusion piping materials with screw pressing device |
US7798531B2 (en) | 2006-02-06 | 2010-09-21 | Taeil Co., Ltd. | Electric fusion piping materials with screw pressing device |
KR100746980B1 (en) * | 2007-01-29 | 2007-08-07 | 주식회사 태일 | Electric fusion piping materials with screw pressing device |
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