JP6885767B2

JP6885767B2 - Pipe fitting

Info

Publication number: JP6885767B2
Application number: JP2017068222A
Authority: JP
Inventors: 博章花木
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 2017-03-30
Filing date: 2017-03-30
Publication date: 2021-06-16
Anticipated expiration: 2037-03-30
Also published as: JP2018169005A

Description

本発明は、樹脂製管部材等を挿入し固定する樹脂製の管継手に関する。 The present invention relates to a resin pipe joint for inserting and fixing a resin pipe member or the like.

樹脂配管の接続等には例えば特許文献１に記載された管継手が提案されている。この管継手は継手本体の端部に設けた複数の接着受口部に樹脂製管部材の端部を挿入して接着固定可能としている。接着受口部は環状の内層と外層の受口を有し、内層に樹脂製管部材と接着接合可能な塩化ビニル樹脂等の接着性樹脂材料を用いている。また、接着受口部の外層と継手本体は一体形成され、樹脂製管部材の熱伸縮応力を吸収可能なポリプロピレン樹脂やポリエチレン樹脂等の耐疲労性の高い樹脂材料で構成されている。
また、特許文献１に記載された管継手は納まりの悪いＬＴ形状の管継手であり、納まりの重要な空調配管で用いられるＤＴやＤＬ形状の継手の場合には、受口同士が近接している。そのため、塩ビ管の受口同士が干渉してしまうおそれがあった。 For example, a pipe joint described in Patent Document 1 has been proposed for connecting resin pipes and the like. This pipe joint can be adhesively fixed by inserting the end portions of the resin pipe member into a plurality of adhesive receiving portions provided at the end portions of the joint body. The adhesive receiving port has an annular inner layer and an outer layer receiving port, and an adhesive resin material such as vinyl chloride resin that can be adhesively bonded to a resin pipe member is used for the inner layer. Further, the outer layer of the adhesive receiving portion and the joint body are integrally formed, and are made of a resin material having high fatigue resistance such as polypropylene resin or polyethylene resin that can absorb the thermal expansion and contraction stress of the resin pipe member.
Further, the pipe joint described in Patent Document 1 is an LT-shaped pipe joint that does not fit well, and in the case of a DT or DL-shaped joint used in an air-conditioning pipe that is important to fit, the sockets are close to each other. There is. Therefore, there is a possibility that the receiving ports of the PVC pipes may interfere with each other.

また、特許文献２に記載された空調ドレン用の管継手は、継手本体部に連続する他の配管材が接続される接続部が中実であり、継手本体部における非発泡性樹脂層の内部に発泡性樹脂からなる断熱層を内蔵している。即ち、継手本体部の非発泡性樹脂層からなる内外壁で断熱層を囲って一体成形した断熱層付きの管継手が開示されている。 Further, in the pipe joint for air conditioning drain described in Patent Document 2, the connection portion to which another piping material continuous with the joint main body is connected is solid, and the inside of the non-foamable resin layer in the joint main body. It has a built-in heat insulating layer made of foamable resin. That is, a pipe joint with a heat insulating layer, which is integrally molded by surrounding the heat insulating layer with an inner / outer wall made of a non-foamable resin layer of the joint main body, is disclosed.

特開２０１１−２０１２号公報Japanese Unexamined Patent Publication No. 2011-2012 特開平１１−２０１３８２号公報JP-A-11-201382

ところで、特許文献１に記載された管継手は、継手本体の断熱のために発泡層を設けた場合、発泡層によって継手本体の強度が低下するという問題があった。
また、特許文献２に記載の空調ドレン用の管継手は、塩ビ管への接着性能を確保するために塩ビ樹脂やＡＢＳ樹脂等の塩ビ用接着剤で接着可能な原料で管継手を成形する必要があった。そのため、原料選択の自由度が低く、熱伝導率の低い原料を用いることができなかった。 By the way, the pipe joint described in Patent Document 1 has a problem that the strength of the joint body is lowered by the foam layer when the foam layer is provided for heat insulation of the joint body.
Further, for the pipe joint for air conditioning drain described in Patent Document 2, it is necessary to mold the pipe joint with a raw material that can be adhered with a vinyl chloride adhesive such as vinyl chloride resin or ABS resin in order to secure the adhesive performance to the vinyl chloride pipe. was there. Therefore, the degree of freedom in selecting the raw material is low, and it is not possible to use a raw material having a low thermal conductivity.

本発明は、このような問題点にかんがみてなされたものであり、継手本体の強度が高い上に熱伝導率が低い材料を選択できると共に、接着受口部への樹脂製管部材の接着を確実に行えるようにした管継手を提供することを目的とする。 The present invention has been made in view of such problems, and a material having high strength of the joint body and low thermal conductivity can be selected, and the resin pipe member can be adhered to the adhesion receiving portion. It is an object of the present invention to provide a pipe fitting that can be reliably performed.

本発明による管継手は、短管状の継手本体と継手本体の端部に設けられた複数の接着受口部とを有すると共に、接着受口部に樹脂製管部材を挿入して接着固定可能に構成される管継手において、接着受口部は内層と外層を有しており、内層に、接着受口部の開口側の第１開口部と継手本体側の第２開口部を有していて樹脂製管部材と接着剤で接着可能な樹脂で成形した環状の受口部材を有しており、外層と継手本体はポリオレフィン樹脂を有しており、外層と継手本体の少なくともいずれか一方が発泡層を有していることを特徴とする。
本発明による管継手は、接着受口部の内層に樹脂製管部材と接着剤で接着可能な樹脂で成形した環状の受口部材を設けたため、樹脂製管部材との接着強度が高く、しかも外層と継手本体はポリオレフィン樹脂からなるため耐疲労性が高い上に熱伝導率が低いために断熱性が高い。また、外層と継手本体の少なくともいずれか一方が発泡層を有しているため、断熱性をより向上できる。 The pipe joint according to the present invention has a short tubular joint body and a plurality of adhesive receiving portions provided at the ends of the joint main body, and a resin pipe member can be inserted into the adhesive receiving portion to be adhesively fixed. In the pipe joint to be constructed, the adhesive socket has an inner layer and an outer layer, and the inner layer has a first opening on the opening side of the adhesive socket and a second opening on the joint body side. It has an annular socket member molded from a resin that can be adhered to a resin pipe member with an adhesive, the outer layer and the joint body have a polyolefin resin, and at least one of the outer layer and the joint body is foamed. It is characterized by having a layer.
In the pipe joint according to the present invention, since the resin pipe member and the annular socket member formed of resin that can be adhered with an adhesive are provided in the inner layer of the adhesive socket portion, the adhesive strength with the resin pipe member is high, and moreover. Since the outer layer and the joint body are made of polyolefin resin, they have high fatigue resistance and low thermal conductivity, so they have high heat insulation. Further, since at least one of the outer layer and the joint body has a foam layer, the heat insulating property can be further improved.

また、接着受口部の外層と継手本体は発泡層からなっていることが好ましい。
ポリオレフィン樹脂からなる接着受口部の外層と継手本体を発泡層で形成したことで断熱性が一層高くなる。 Further, it is preferable that the outer layer of the adhesive receiving portion and the joint body are made of a foam layer.
By forming the outer layer of the adhesive receiving portion made of polyolefin resin and the joint body with a foam layer, the heat insulating property is further improved.

また、接着受口部の外層は非発泡層からなり、継手本体は非発泡層で構成されていると共に、受口部材に突出形成された凸部に近接する位置に発泡層が延びて設けられていることが好ましい。
ポリオレフィン樹脂の継手本体について外側を非発泡層として包囲し内側に発泡層を充填した２層構造とすることで耐疲労性が高く断熱性が高い上に、継手本体の内部に設けた発泡層によってより断熱性を向上できる。しかも、継手本体は受口部材の端部まで突出形成した凸部に近接する位置まで内部の発泡層を延在できるため断熱性が一層向上する。 Further, the outer layer of the adhesive receiving portion is made of a non-foaming layer, the joint body is composed of the non-foaming layer, and the foaming layer is provided at a position close to the convex portion formed on the receiving portion member. Is preferable.
The polyolefin resin joint body has a two-layer structure in which the outside is surrounded by a non-foaming layer and the inside is filled with a foam layer. The heat insulation can be further improved. Moreover, since the inner foam layer of the joint body can extend to a position close to the convex portion formed so as to project to the end of the receiving member, the heat insulating property is further improved.

また、受口部材における第２開口部を形成する環状突起の外周側端部に面取り部が形成されていてもよい。
受口部材における環状突起の外周側端部の角部に面取り部がテーパ状に形成されているため、複数の接着受口部の受口部材が近接配置されていても受口部材同士の隙間を確保できるため継手本体の強度を損なうことがない。 Further, a chamfered portion may be formed at the outer peripheral end portion of the annular protrusion forming the second opening in the receiving member.
Since the chamfered portion is formed in a tapered shape at the corner of the outer peripheral end of the annular protrusion of the receiving member, the gap between the receiving members even if the receiving members of a plurality of adhesive receiving portions are arranged close to each other. Therefore, the strength of the joint body is not impaired.

また、受口部材の内面は第１開口部から第２開口部に向けて次第に縮径されていてもよい。
この場合、受口部材の内面に抜きテーパが形成されているため金型を抜けやすくすることができる上に、内層である受口部材が管継手の外層から抜けないように形成できる。 Further, the inner surface of the receiving member may be gradually reduced in diameter from the first opening to the second opening.
In this case, since the inner surface of the receiving member is formed with a punching taper, the mold can be easily pulled out, and the receiving member, which is an inner layer, can be formed so as not to come off from the outer layer of the pipe joint.

また、本発明による管継手は、短管状の継手本体と前記継手本体の端部に設けられた複数の接着受口部とを有すると共に、接着受口部に樹脂製管部材を挿入して接着固定可能に構成される管継手において、接着受口部は内層と外層を有しており、内層に、接着受口部の開口側の第１開口部と継手本体側の第２開口部を有していて樹脂製管部材と接着剤で接着可能な樹脂で成形した環状の受口部材を有しており、外層と継手本体はポリオレフィン樹脂を有しており、受口部材は透明な層であり、接着受口部の外層には受口部材の内部を目視可能な窓部が形成され、窓部内に前記受口部材の一部が嵌合されて表面に露出していることを特徴とする。
本発明は、接着受口部内に樹脂製管部材を挿入して接着剤によって受口部材と接着する際、外層に設けた窓部に嵌合する透明な受口部材を通して受口部材内に樹脂製管部材が十分挿入されたことや接着剤が塗布されたことを目視確認できる。しかも、受口部材の一部が外層の窓部に突出嵌合するため、樹脂製管部材に引き抜き圧力がかかった場合でも受口部材が抜けることを防止できる。 Further, the pipe joint according to the present invention has a short tubular joint body and a plurality of adhesive receiving portions provided at the ends of the joint main body, and a resin pipe member is inserted into the adhesive receiving portion to bond them. In a pipe joint that can be fixed, the adhesive socket has an inner layer and an outer layer, and the inner layer has a first opening on the opening side of the adhesive socket and a second opening on the joint body side. It has an annular socket member molded from a resin that can be adhered to a resin pipe member with an adhesive, the outer layer and the joint body have a polyolefin resin, and the socket member is a transparent layer. The outer layer of the adhesive receiving portion is characterized in that a window portion is formed so that the inside of the receiving portion member can be visually recognized, and a part of the receiving portion member is fitted in the window portion and exposed to the surface. To do.
In the present invention, when a resin pipe member is inserted into an adhesive receiving portion and adhered to the receiving member with an adhesive, the resin is introduced into the receiving member through a transparent receiving member that fits into the window provided in the outer layer. It can be visually confirmed that the pipe making member has been sufficiently inserted and that the adhesive has been applied. Moreover, since a part of the receiving member is projected and fitted to the window portion of the outer layer, it is possible to prevent the receiving member from coming off even when a pulling pressure is applied to the resin pipe member.

本発明による管継手は、接着受口部の外層と継手本体がポリオレフィン樹脂からなるために耐疲労性が高い上に熱伝導率が低くて断熱効果に優れている。しかも、内層の受口部材を塩化ビニルまたはＡＢＳ樹脂製にしたことで樹脂製管部材の接着を確実に行うことができる。
また、外層と継手本体の少なくともいずれか一方が発泡層を有しているため、断熱性をより向上できる。 Since the outer layer of the adhesive socket and the joint body are made of polyolefin resin, the pipe joint according to the present invention has high fatigue resistance, low thermal conductivity, and excellent heat insulating effect. Moreover, since the receiving member of the inner layer is made of vinyl chloride or ABS resin, the resin pipe member can be reliably adhered.
Further, since at least one of the outer layer and the joint body has a foam layer, the heat insulating property can be further improved.

本発明の第一実施形態による管継手の斜視図である。It is a perspective view of the pipe fitting according to the 1st Embodiment of this invention. 図１に示す管継手の接着受口部に樹脂製管部材を嵌合接着した状態の要部断面図である。FIG. 5 is a cross-sectional view of a main part in a state where a resin pipe member is fitted and bonded to an adhesive receiving portion of a pipe joint shown in FIG. 受口部材の正面図である。It is a front view of the receiving port member. 図３に示す受口部材を示すものであり、（ａ）は第１開口部側から見た斜視図、（ｂ）は第２開口部側から見た斜視図である。The receiving member shown in FIG. 3 is shown. FIG. 3A is a perspective view seen from the first opening side, and FIG. 3B is a perspective view seen from the second opening side. 第二実施形態による管継手の接着受口部の要部断面図である。It is sectional drawing of the main part of the adhesive receiving part of a pipe joint by 2nd Embodiment. 比較例による管継手の接着受口部の要部断面図である。It is sectional drawing of the main part of the adhesive receiving part of a pipe joint by a comparative example. 第三実施形態による管継手を示すものであり、（ａ）は要部縦断面図、（ｂ）は同図（ａ）におけるＡ部拡大図である。The pipe joint according to the third embodiment is shown, (a) is a vertical sectional view of a main part, and (b) is an enlarged view of part A in the same figure (a). 第三実施形態による管継手の変形例であって、Ｔ字管の断面図である。FIG. 5 is a cross-sectional view of a T-shaped pipe, which is a modification of the pipe joint according to the third embodiment. 第四実施形態による管継手の内層に装着する受口部材を示すものであり、（ａ）は側面図、（ｂ）は管継手の型抜き工程を示す図である。It shows the receiving member to be attached to the inner layer of a pipe joint according to 4th Embodiment, (a) is a side view, and (b) is a figure which shows the die-cutting process of a pipe joint.

以下、本発明の各実施形態による管継手について添付図面により説明する。
まず本発明の第一実施形態による管継手を図１〜図４により説明する。
図１に示す樹脂製の管継手１(以下、単に管継手という)は図２に示す樹脂製管部材２を挿入して接着剤等で接着可能なものである。管継手１は短管状で例えば略９０度直角に湾曲させられた管状の継手本体３と、継手本体３の両端部に設けられた複数の接着受口部４と、を有するエルボタイプである。
管継手１の接着受口部４は継手本体３に対してフランジ部５を介して拡径されて環状に形成されている。接着受口部４に対して樹脂製管部材２の端部を挿入して接着剤により接着固定することで互いに接続できる。継手本体３はその内径が樹脂製管部材２の内径とほぼ同じになるように形成されている。 Hereinafter, the pipe joint according to each embodiment of the present invention will be described with reference to the accompanying drawings.
First, the pipe joint according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
The resin pipe joint 1 shown in FIG. 1 (hereinafter, simply referred to as a pipe joint) can be bonded by inserting the resin pipe member 2 shown in FIG. 2 and using an adhesive or the like. The pipe joint 1 is an elbow type having a short tubular joint body 3 which is curved at a right angle of about 90 degrees and a plurality of adhesive receiving portions 4 provided at both ends of the joint body 3.
The adhesive receiving portion 4 of the pipe joint 1 is formed in an annular shape by expanding the diameter with respect to the joint main body 3 via the flange portion 5. By inserting the end portion of the resin pipe member 2 into the adhesive receiving portion 4 and adhering and fixing the resin pipe member 2 with an adhesive, they can be connected to each other. The inner diameter of the joint body 3 is formed to be substantially the same as the inner diameter of the resin pipe member 2.

本発明において、図１に示す管継手１はＬ型であるが、チーズ型やＬＴ型等各種のものを採用できる。この管継手１は例えば住宅やビル等の建築物に用いた空調用ドレン設備であり、本発明の実施形態による管継手１は保温機能を有していて周囲の結露を防ぐようにした配管設備における結露防止装置である。しかも、配管部の内部を流れる流体の温度や外気温の影響等により、管継手１は樹脂製管部材２と共に熱伸縮を繰り返すことになる。この管継手１や樹脂製管部材２の熱伸縮は配管部の上流側に設けられるものほど大きくなる傾向にある。 In the present invention, the pipe joint 1 shown in FIG. 1 is an L type, but various types such as a cheese type and an LT type can be adopted. This pipe joint 1 is a drain facility for air conditioning used in a building such as a house or a building, and the pipe joint 1 according to the embodiment of the present invention has a heat retaining function to prevent dew condensation in the surroundings. It is a dew condensation prevention device in. Moreover, the pipe joint 1 repeats thermal expansion and contraction together with the resin pipe member 2 due to the influence of the temperature of the fluid flowing inside the pipe portion and the outside air temperature. The thermal expansion and contraction of the pipe joint 1 and the resin pipe member 2 tends to be larger as they are provided on the upstream side of the pipe portion.

図２に示す管継手１の接着受口部４は環状の内層７と外層８とで複層構造を有しており、外層８は継手本体３と同一樹脂材料からなる一体形状とされている。接着受口部４の外層８と継手本体３は、樹脂製管部材２の熱伸縮応力を吸収可能な伸縮性樹脂材料で構成されている。また、内層７を構成する樹脂材料は樹脂製管部材２と接着可能な接着用樹脂材料であり、樹脂製管部材２と同種の樹脂材料を用いることが好ましい。 The adhesive receiving portion 4 of the pipe joint 1 shown in FIG. 2 has an annular inner layer 7 and an outer layer 8 having a multi-layer structure, and the outer layer 8 has an integral shape made of the same resin material as the joint body 3. .. The outer layer 8 of the adhesive receiving portion 4 and the joint body 3 are made of a stretchable resin material capable of absorbing the thermal stretching stress of the resin pipe member 2. Further, the resin material constituting the inner layer 7 is an adhesive resin material that can be adhered to the resin pipe member 2, and it is preferable to use the same type of resin material as the resin pipe member 2.

例えば、樹脂製管部材２が塩化ビニル樹脂またはＡＢＳ樹脂である場合、外層８と継手本体３の伸縮性樹脂材料はポリプロピレン樹脂やポリエチレン樹脂、ポリブテン樹脂等のポリオレフィン樹脂であるものとする。より具体的には、プロピレン重合体、またはプロピレンを主体とする共重合体等で構成する。これらポリオレフィン樹脂は塩化ビニルやＡＢＳ樹脂と比較して熱伝導率が低く耐疲労性が高い。
しかも、本実施形態において、外層８と継手本体３の伸縮性樹脂材料は発泡性樹脂からなる単層構成とされている。これにより、外層８と継手本体３の断熱性が更に高く保持される。 For example, when the resin pipe member 2 is a vinyl chloride resin or an ABS resin, the elastic resin material of the outer layer 8 and the joint body 3 is a polyolefin resin such as a polypropylene resin, a polyethylene resin, or a polybutene resin. More specifically, it is composed of a propylene polymer, a copolymer mainly composed of propylene, or the like. These polyolefin resins have lower thermal conductivity and higher fatigue resistance than vinyl chloride and ABS resins.
Moreover, in the present embodiment, the stretchable resin material of the outer layer 8 and the joint body 3 has a single-layer structure made of a foamable resin. As a result, the heat insulating properties of the outer layer 8 and the joint body 3 are further maintained higher.

内層７は樹脂製管部材２との接着性を確保するため、例えば塩化ビニル樹脂またはＡＢＳ樹脂等の樹脂製管部材２と接着剤で接着可能な樹脂であるものとする。接着剤で接着可能な樹脂として、他にポリカーボネート樹脂、アクリル樹脂、メタクリル樹脂、ＡＥＳ樹脂等を採用できる。更にはポリオレフィン樹脂を除く他の樹脂を採用してもよい。樹脂製管部材２も発泡性樹脂からなる単層構成とされていてもよい。そのため、樹脂製管部材２の断熱性が高く保持される。樹脂製管部材２を内層７内に挿入する際に塗布する接着剤は塩化ビニル樹脂系またはＡＢＳ樹脂系の接着剤を用いることで強固に接着固定できる。 The inner layer 7 is a resin that can be adhered to the resin pipe member 2 such as vinyl chloride resin or ABS resin with an adhesive in order to secure the adhesiveness to the resin pipe member 2. As the resin that can be adhered with an adhesive, a polycarbonate resin, an acrylic resin, a methacrylic resin, an AES resin, or the like can be used. Further, other resins other than the polyolefin resin may be adopted. The resin pipe member 2 may also have a single-layer structure made of a foamable resin. Therefore, the heat insulating property of the resin pipe member 2 is kept high. The adhesive applied when the resin pipe member 2 is inserted into the inner layer 7 can be firmly adhered and fixed by using a vinyl chloride resin-based adhesive or an ABS resin-based adhesive.

次に、本実施形態による管継手１の構成について詳述する。
図２は管継手１の接着受口部４と樹脂製管部材２の接合構造を示すものである。図２において、接着受口部４の内層７は図３及び図４に示すように硬質材料からなる略円環状の受口部材９で構成されている。受口部材９において、樹脂製管部材２を挿入する上部開口に第１開口部１０が形成され、第１開口部１０に対向する継手本体３側に第２開口部１１が形成されている。第１開口部１０と第２開口部１１は流体の流れ方向に対向配置されている。 Next, the configuration of the pipe joint 1 according to the present embodiment will be described in detail.
FIG. 2 shows a joint structure between the adhesive receiving portion 4 of the pipe joint 1 and the resin pipe member 2. In FIG. 2, the inner layer 7 of the adhesive receiving portion 4 is composed of a substantially annular receiving member 9 made of a hard material as shown in FIGS. 3 and 4. In the receiving member 9, the first opening 10 is formed in the upper opening into which the resin pipe member 2 is inserted, and the second opening 11 is formed on the joint body 3 side facing the first opening 10. The first opening 10 and the second opening 11 are arranged so as to face each other in the fluid flow direction.

第２開口部１１は第１開口部１０よりも小径に形成され、第２開口部１１の周縁部には受口部材９の底部としてリング状の環状突起１２が形成されている。しかも、受口部材９の外周面９ａにはリング状の凹部１４と凸部１５がその長手方向に交互に配列形成されている。環状突起１２の継手本体３側の下面にもリング状の凹部１７と凸部１８が径方向に交互に配列形成されている。
受口部材９は透明な塩化ビニル樹脂またはＡＢＳ樹脂で形成されている。また、受口部材９の外周面９ａの下部には例えば凹部１４と凸部１５に跨る凸状のリブ２０が一体形成されている。或いは、リブ２０を受口部材９と別体に略コの字状に形成して凸部１５に直交する方向に嵌合してもよい。 The second opening 11 is formed to have a smaller diameter than the first opening 10, and a ring-shaped annular protrusion 12 is formed on the peripheral edge of the second opening 11 as the bottom of the receiving member 9. Moreover, ring-shaped concave portions 14 and convex portions 15 are alternately arranged in the longitudinal direction on the outer peripheral surface 9a of the receiving member 9. Ring-shaped concave portions 17 and convex portions 18 are alternately arranged in the radial direction on the lower surface of the annular protrusion 12 on the joint body 3 side.
The receiving member 9 is made of a transparent vinyl chloride resin or ABS resin. Further, for example, a convex rib 20 straddling the concave portion 14 and the convex portion 15 is integrally formed at the lower portion of the outer peripheral surface 9a of the receiving member 9. Alternatively, the rib 20 may be formed separately from the receiving member 9 in a substantially U shape and fitted in a direction orthogonal to the convex portion 15.

接着受口部４の外層８は継手本体３と一体形成されており、継手本体３の一部を構成する。外層８の内周面８ａにはリング状の凸部２１と凹部２２が交互に配列形成されており、受口部材９の外周面９ａに形成された凹部１４と凸部１５に互いに噛み込んで嵌合されている。そのため、接着した樹脂製管部材２を引っ張る力が働いたとしても受口部材９が継手本体３の外層８から抜けることを阻止できる。
また、フランジ部５を介して外層８と接続される継手本体３の上面３ａは受口部材９の環状突起１２に対向しており、リング状の凸部２４と凹部２５が径方向に同心状に交互に配列形成され、環状突起１２の下面に形成された凹部１７と凸部１８が噛み込んで嵌合している。そのため、継手本体３に内圧が付加されたときや冷却や加熱等により継手本体３が拡張または縮小した場合でも受口部材９と継手本体３との間に互いに密着する荷重が働き、止水性を失うことを阻止できる。 The outer layer 8 of the adhesive receiving portion 4 is integrally formed with the joint main body 3, and forms a part of the joint main body 3. Ring-shaped convex portions 21 and concave portions 22 are alternately arranged on the inner peripheral surface 8a of the outer layer 8, and are engaged with each other in the concave portions 14 and the convex portions 15 formed on the outer peripheral surface 9a of the receiving member 9. It is fitted. Therefore, even if a force for pulling the bonded resin pipe member 2 acts, it is possible to prevent the receiving member 9 from coming off from the outer layer 8 of the joint body 3.
Further, the upper surface 3a of the joint body 3 connected to the outer layer 8 via the flange portion 5 faces the annular protrusion 12 of the receiving member 9, and the ring-shaped convex portion 24 and the concave portion 25 are concentric in the radial direction. The concave portions 17 and the convex portions 18 formed on the lower surface of the annular protrusion 12 are engaged and fitted to each other. Therefore, even when the internal pressure is applied to the joint body 3, or when the joint body 3 is expanded or contracted due to cooling, heating, or the like, a load that is in close contact with each other acts between the receiving member 9 and the joint body 3, and the water is stopped. You can prevent it from being lost.

また、外層８の外周面には径方向に貫通孔をなす窓部２７が形成され、この窓部２７に嵌合される受口部材９のリブ２０が外部に露出している。受口部材９は透明であるため、接着受口部４に挿入された樹脂製管部材２と、樹脂製管部材２及び受口部材９の内面の間に塗布された接着剤とを窓部２７のリブ２０を通して目視確認できる。そのため、窓部２７は外層８の下端部近傍、内層７である受口部材９の環状突起１２の近傍の高さに形成することが好ましい。 Further, a window portion 27 forming a through hole in the radial direction is formed on the outer peripheral surface of the outer layer 8, and the rib 20 of the receiving member 9 fitted to the window portion 27 is exposed to the outside. Since the receiving member 9 is transparent, the resin pipe member 2 inserted into the adhesive receiving portion 4 and the adhesive applied between the resin pipe member 2 and the inner surface of the receiving member 9 are attached to the window portion. It can be visually confirmed through the rib 20 of 27. Therefore, it is preferable that the window portion 27 is formed at a height near the lower end portion of the outer layer 8 and near the annular protrusion 12 of the receiving member 9 which is the inner layer 7.

上述したように本第一実施形態による樹脂製の管継手１によれば、次の作用効果を奏する。即ち、継手本体３及び接着受口部４の外層８の材質として、塩化ビニル樹脂またはＡＢＳ樹脂より断熱性の高いポリオレフィン樹脂の発泡層で形成したため、塩化ビニル樹脂またはＡＢＳ樹脂やこれらを発泡させたものよりも断熱性を向上できて結露の発生を防止できる。しかも、耐衝撃性、生産性、製造コストが低廉になる。
また、外層８に嵌合する受口部材９を樹脂製管部材２と同様な塩化ビニル樹脂またはＡＢＳ樹脂で形成して同系の接着剤で接着したため、接着強度が高い。 As described above, the resin pipe joint 1 according to the first embodiment has the following effects. That is, since the outer layer 8 of the joint body 3 and the adhesive receiving portion 4 was formed of a foamed layer of a polyolefin resin having higher heat insulating properties than the vinyl chloride resin or the ABS resin, the vinyl chloride resin or the ABS resin or these were foamed. It is possible to improve the heat insulating property and prevent the occurrence of dew condensation. Moreover, impact resistance, productivity, and manufacturing cost are low.
Further, since the receiving member 9 fitted to the outer layer 8 is formed of the same vinyl chloride resin or ABS resin as the resin pipe member 2 and bonded with a similar adhesive, the adhesive strength is high.

接着受口部４の内層７である透明な受口部材９に設けたリブ２０を外層８に形成した窓部２７に嵌合させて外部表面に露出させたため、樹脂製管部材２を受口部材９の内奥部まで挿入したことの確認や接着剤を塗布したことの確認を窓部２７を通して目視で行える。
また、受口部材９の外周面９ａに形成した凹部１４及び凸部１５を外層８の内周面８ａに形成した凸部２１及び凹部２２と嵌合させたため、樹脂製管部材２に引き抜き方向の荷重が働いても引き抜きを阻止できる。更に、受口部材９の底部の環状突起１２の下面に形成した凹部１７及び凸部１８と凸部２４及び凹部２５とを嵌合させたため、冷熱によって管継手１が拡径縮小した場合に互いに密着する荷重が働いて止水性を失うことはない。 Since the rib 20 provided on the transparent receiving member 9 which is the inner layer 7 of the adhesive receiving portion 4 is fitted into the window portion 27 formed on the outer layer 8 and exposed to the outer surface, the resin pipe member 2 is received. It is possible to visually confirm that the member 9 has been inserted all the way to the inner part and that the adhesive has been applied through the window portion 27.
Further, since the concave portion 14 and the convex portion 15 formed on the outer peripheral surface 9a of the receiving member 9 are fitted with the convex portion 21 and the concave portion 22 formed on the inner peripheral surface 8a of the outer layer 8, the resin pipe member 2 is pulled out in the pulling direction. It can prevent pulling out even if the load of is applied. Further, since the concave portion 17 and the convex portion 18 formed on the lower surface of the annular protrusion 12 at the bottom of the receiving member 9 and the convex portion 24 and the concave portion 25 are fitted, the pipe joint 1 expands and contracts due to cold heat. The close contact load does not work and the water stoppage is not lost.

以上、本発明の第一実施形態による樹脂製の管継手１について説明したが、本発明は上述の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。なお、以下に、本発明の他の実施形態や変形例について説明するが、上述した実施形態と同一または同様な部材、部分には同一の符号を用いてその説明を省略する。
例えば、第一実施形態の変形例による管継手１として、外層８と継手本体３の一方が全体にポリオレフィン樹脂の発泡層で形成され、他方が非発泡層の硬質樹脂で形成されていてもよい。 Although the resin pipe joint 1 according to the first embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be appropriately changed without departing from the spirit of the present invention. Although other embodiments and modifications of the present invention will be described below, the same reference numerals will be used for the same or similar members and parts as those in the above-described embodiments, and the description thereof will be omitted.
For example, as the pipe joint 1 according to the modified example of the first embodiment, one of the outer layer 8 and the joint body 3 may be formed of a foamed layer of polyolefin resin as a whole, and the other may be formed of a hard resin of a non-foamed layer. ..

本第二実施形態による樹脂製の管継手１Ａは、図５に示すように、基本的に第一実施形態による管継手１と同一構成を備えている。
本第二実施形態による管継手１Ａでは、外層８に窓部２７は形成されておらず、その内面の全長に亘って凸部２１と凹部２２が交互に配列形成され、受口部材９の外周面９ａに形成された凹部１４と凸部１５に噛み合って嵌合している。そのため、受口部材９にリブ２０は設けられていない。なお、第一実施形態による管継手１と同様に外層８に窓部２７、受口部材９にリブ２０を形成してもよい。 As shown in FIG. 5, the resin pipe joint 1A according to the second embodiment basically has the same configuration as the pipe joint 1 according to the first embodiment.
In the pipe joint 1A according to the second embodiment, the window portion 27 is not formed on the outer layer 8, and the convex portions 21 and the concave portions 22 are alternately arranged and formed over the entire length of the inner surface thereof, and the outer periphery of the receiving member 9 is formed. The concave portion 14 and the convex portion 15 formed on the surface 9a are engaged with each other to be fitted. Therefore, the receiving member 9 is not provided with the rib 20. As in the case of the pipe joint 1 according to the first embodiment, the window portion 27 may be formed on the outer layer 8 and the rib 20 may be formed on the receiving member 9.

第一実施形態による管継手１との他の相違点として、第二実施形態による管継手１Ａは外層８を含む継手本体３と樹脂製管部材２は非発泡性の樹脂が充填された非発泡層として形成されている。そして、継手本体３は非発泡性のポリオレフィン樹脂によって射出成形され、その内部には流体の流れ方向に沿ってポリオレフィン樹脂の発泡層３０が充填されて２層構造を有している。
しかも、継手本体３の上面３ａにおける受口部材９のリング状の環状突起１２との当接面に凸部２４と凹部２５が同心円状に交互に形成され、環状突起１２の凹部１７と凸部１８とが嵌合している。継手本体３の上面３ａにおける凸部２４の近傍にまで発泡層３０が延びて形成されている。特に環状突起１２に凹部１７が形成されているため、これに嵌合する上面３ａの凸部２４が形成されており、この凸部２４の近傍まで発泡層３０が樹脂製管部材２側に延びているため断熱性を高めることができる。 Another difference from the pipe joint 1 according to the first embodiment is that the pipe joint 1A according to the second embodiment has a joint body 3 including an outer layer 8 and a resin pipe member 2 is non-foamed filled with a non-foamable resin. It is formed as a layer. The joint body 3 is injection-molded with a non-foamable polyolefin resin, and the inside thereof is filled with a foam layer 30 of the polyolefin resin along the flow direction of the fluid to have a two-layer structure.
Moreover, the convex portions 24 and the concave portions 25 are alternately formed concentrically on the contact surface of the receiving member 9 with the ring-shaped annular projection 12 on the upper surface 3a of the joint body 3, and the concave portions 17 and the convex portions of the annular projection 12 are formed. 18 is fitted. The foam layer 30 is formed so as to extend to the vicinity of the convex portion 24 on the upper surface 3a of the joint body 3. In particular, since the concave portion 17 is formed in the annular protrusion 12, the convex portion 24 of the upper surface 3a that fits the concave portion 17 is formed, and the foam layer 30 extends toward the resin pipe member 2 side to the vicinity of the convex portion 24. Therefore, the heat insulating property can be improved.

次に、管継手１Ａの製造方法において、２層構造の継手本体３を製造する方法の一例を説明する。継手本体３用のキャビティを有する金型内にポリオレフィン樹脂の非発泡性溶融樹脂を射出した後に、発泡層３０となるポリオレフィン樹脂の発泡性溶融樹脂を金型内に注入するものとする。そして、発泡性溶融樹脂の注入圧によって非発泡性溶融樹脂を金型内の継手本体３用のキャビティに密に充填すると同時に継手本体３用キャビティを形成する金型内面に沿わせた状態で、金型内で両溶融樹脂を冷却硬化させる。
また、継手本体３に連続して設けられた外層８はその金型内にポリオレフィン樹脂の発泡性溶融樹脂を充填した中実構成である。こうして、継手本体３の内部に発泡樹脂からなる発泡層３０を備えた２層構造の継手本体３を製造できる。 Next, in the method of manufacturing the pipe joint 1A, an example of a method of manufacturing the joint body 3 having a two-layer structure will be described. After injecting the non-foamable melt resin of the polyolefin resin into the mold having the cavity for the joint body 3, the foamable melt resin of the polyolefin resin to be the foam layer 30 is injected into the mold. Then, the non-foamable molten resin is densely filled in the cavity for the joint body 3 in the mold by the injection pressure of the foamable molten resin, and at the same time, the cavity is formed along the inner surface of the mold for forming the cavity for the joint body 3. Both molten resins are cooled and cured in the mold.
Further, the outer layer 8 continuously provided on the joint body 3 has a solid structure in which the mold is filled with a foamable melt resin of a polyolefin resin. In this way, it is possible to manufacture the joint body 3 having a two-layer structure in which the foam layer 30 made of foam resin is provided inside the joint body 3.

これに対し、図６は比較例による継手本体３と受口部材９の構成を示すものである。図６において、継手本体３の上面３ａと受口部材９の環状突起１２との当接部に凹部と凸部が設けられていない点で図５に示す管継手１Ａと相違する。比較例では、継手本体３の上面３ａの近傍まで発泡層３０を延伸させて形成することはできず、本第二実施形態による管継手１Ａと比較して、上面３ａと環状突起１２の部分の断熱性が比較的低い。
そのため、本第二実施形態による管継手１Ａによれば、継手本体３の上面３ａ近傍に設けた凸部２４と発泡層３０によって樹脂製管部材２との間の断熱性を比較例の構成よりも高めることができる。 On the other hand, FIG. 6 shows the configuration of the joint body 3 and the receiving member 9 according to a comparative example. FIG. 6 is different from the pipe joint 1A shown in FIG. 5 in that a concave portion and a convex portion are not provided at the contact portion between the upper surface 3a of the joint body 3 and the annular protrusion 12 of the receiving member 9. In the comparative example, the foam layer 30 cannot be formed by extending the foam layer 30 to the vicinity of the upper surface 3a of the joint body 3, and the upper surface 3a and the annular protrusion 12 portion are compared with the pipe joint 1A according to the second embodiment. Insulation is relatively low.
Therefore, according to the pipe joint 1A according to the second embodiment, the heat insulating property between the resin pipe member 2 is improved by the convex portion 24 provided near the upper surface 3a of the joint body 3 and the foam layer 30 from the configuration of the comparative example. Can also be increased.

第二実施形態の変形例として、外層８としてポリオレフィン樹脂の非発泡性樹脂の内部に発泡性樹脂からなる発泡層３０を充填した２層構造を採用してもよい。或いは外層８を上述した２層構造とし、継手本体３を全体にポリオレフィン樹脂の非発泡性樹脂による中実で単一の硬質樹脂層に構成してもよい。 As a modification of the second embodiment, a two-layer structure in which a foamed layer 30 made of a foamable resin is filled inside a non-foamable resin of a polyolefin resin may be adopted as the outer layer 8. Alternatively, the outer layer 8 may have the above-mentioned two-layer structure, and the joint body 3 may be entirely formed of a solid and single hard resin layer made of a non-foamable resin of polyolefin resin.

次に本発明の第三実施形態による管継手１Ｂを図７により説明する。
図７に示す管継手１Ｂにおける継手本体３と接着受口部４の接合部において、外層８の内側に嵌合された内層７の受口部材９は略円環状の外周面９ａと第２開口部１１を形成する略リング状の環状突起１２とを有している。これら外周面９ａに交互に形成された凹部１４及び凸部１５が外層８の内周面に形成された凸部２１及び凹部２２とに噛み合って嵌合されている。同様に環状突起１２に同心円状に形成された凹部１７及び凸部１８が継手本体３の上面３ａに形成された凸部２４及び凹部２５に噛み合って嵌合されている。 Next, the pipe joint 1B according to the third embodiment of the present invention will be described with reference to FIG.
At the joint between the joint body 3 and the adhesive receiving portion 4 in the pipe joint 1B shown in FIG. 7, the receiving member 9 of the inner layer 7 fitted inside the outer layer 8 has a substantially annular outer peripheral surface 9a and a second opening. It has a substantially ring-shaped annular protrusion 12 forming the portion 11. The concave portions 14 and the convex portions 15 alternately formed on the outer peripheral surface 9a are meshed with and fitted with the convex portions 21 and the concave portions 22 formed on the inner peripheral surface of the outer layer 8. Similarly, the concave portion 17 and the convex portion 18 formed concentrically on the annular protrusion 12 are meshed with and fitted to the convex portion 24 and the concave portion 25 formed on the upper surface 3a of the joint body 3.

そして、受口部材９の外周面９ａと環状突起１２とのリング状の交差角部(外周側端部)には断面視平面状に切除された面取り部３２が全周に形成されている。面取り部３２は断面視平面部に代えてＣ面取り(丸面取り)形状でもよい。
本第三実施形態によれば、受口部材９の外周面９ａと環状突起１２の角部に面取り部３２を形成したため、外層８と継手本体３との接続部における面取り部３２の部分の肉厚が大きくなり、継手本体３の強度を向上できる。 A chamfered portion 32 cut out in a plan view of the cross section is formed on the entire circumference at a ring-shaped intersecting corner portion (outer peripheral side end portion) between the outer peripheral surface 9a of the receiving member 9 and the annular protrusion 12. The chamfered portion 32 may have a C chamfered (round chamfered) shape instead of the cross-sectional view plane portion.
According to the third embodiment, since the chamfered portion 32 is formed on the outer peripheral surface 9a of the receiving member 9 and the corner portion of the annular protrusion 12, the meat of the chamfered portion 32 at the connecting portion between the outer layer 8 and the joint body 3 is formed. The thickness is increased, and the strength of the joint body 3 can be improved.

次に図８は第三実施形態の変形例であり、上述した面取り部３２の構成をＴ字型(チーズ)の管継手１Ｃに形成した事例である。
本変形例による管継手１Ｃによれば、継手本体３を挟んで三方向に互いに直交させて交差配置した各接着受口部４において、各受口部材９の外周面９ａと環状突起１２との交差角部にそれぞれ面取り部３２を設けたため、短管状の継手本体３に設けた各受口部材９の面取り部３２同士の隙間３３が大きくなる。そのため、継手本体３の各受口部材９が互いに近接配置されていても、その強度を向上できる。 Next, FIG. 8 is a modified example of the third embodiment, which is an example in which the above-described chamfered portion 32 is formed in a T-shaped (cheese) pipe joint 1C.
According to the pipe joint 1C according to the present modification, in each of the adhesive receiving portions 4 arranged so as to be orthogonal to each other in three directions with the joint main body 3 interposed therebetween, the outer peripheral surface 9a of each receiving member 9 and the annular protrusion 12 are formed. Since the chamfered portions 32 are provided at the crossing corners, the gap 33 between the chamfered portions 32 of each receiving member 9 provided in the short tubular joint body 3 becomes large. Therefore, even if the receiving members 9 of the joint body 3 are arranged close to each other, the strength thereof can be improved.

次に本発明の第四実施形態による管継手１Ｄについて図９（ａ）及び（ｂ）により説明する。
図９（ａ）に示す受口部材９はその内面９ｂに抜きテーパ面を形成した。内面９ｂをテーパ状に形成し、第１開口部１０から第２開口部１１に向けて次第に内面９ｂの内径が縮径するように形成したため、射出成形時に金型３５を抜け易くした。しかも、外周面９ａの凹部１４及び凸部１５と外層８の凹部２２及び凸部２１とを噛み合わせて嵌合させたことで、受口部材９が継手本体３の外層８から抜けにくいように形成した。
これによって管継手１、１Ａ、１Ｂに挿入される樹脂製管部材２と例えばＴＳ接合可能になる。 Next, the pipe joint 1D according to the fourth embodiment of the present invention will be described with reference to FIGS. 9A and 9B.
The receiving member 9 shown in FIG. 9A has a punched tapered surface formed on its inner surface 9b. Since the inner surface 9b is formed in a tapered shape and the inner diameter of the inner surface 9b is gradually reduced from the first opening 10 to the second opening 11, the mold 35 can be easily pulled out during injection molding. Moreover, by engaging and fitting the concave portion 14 and the convex portion 15 of the outer peripheral surface 9a with the concave portion 22 and the convex portion 21 of the outer layer 8, the receiving member 9 is prevented from coming off from the outer layer 8 of the joint body 3. Formed.
This enables, for example, TS joining with the resin pipe member 2 inserted into the pipe joints 1, 1A and 1B.

なお、上述した第一実施形態による管継手１において、接着受口部４の外層８に窓部２７を形成して内層７である透明な受口部材９の一部のリブ２０を窓部２７に嵌合させて外層８の表面に露出させたが、本発明による管継手１において窓部２７やリブ２０はなくてもよい。
また、外層８に窓部２７を設けない場合、受口部材９は透明でなくてもよい。 In the pipe joint 1 according to the first embodiment described above, the window portion 27 is formed in the outer layer 8 of the adhesive receiving portion 4, and the rib 20 of a part of the transparent receiving member 9 which is the inner layer 7 is formed in the window portion 27. However, the pipe joint 1 according to the present invention may not have the window portion 27 or the rib 20.
Further, when the window portion 27 is not provided on the outer layer 8, the receiving member 9 does not have to be transparent.

１，１Ａ，１Ｂ，１Ｃ管継手
２樹脂製管部材
３継手本体
４接着受口部
７内層
８外層
９受口部材
１０第１開口部
１１第２開口部
１２環状突起
１４、１７、２２、２５凹部
１５、１８、２１、２４凸部
２０リブ
２７窓部
３０発泡層
３２面取り部
３３隙間 1,1A, 1B, 1C Pipe fitting 2 Resin pipe member 3 Joint body 4 Adhesive receiving port 7 Inner layer 8 Outer layer 9 Receiving member 10 1st opening 11 2nd opening 12 Annular protrusions 14, 17, 22, 25 Recesses 15, 18, 21, 24 Convex 20 Ribs 27 Window 30 Foam layer 32 Chamfer 33 Gap

Claims

短管状の継手本体と前記継手本体の端部に設けられた複数の接着受口部とを有すると共に、前記接着受口部に樹脂製管部材を挿入して接着固定可能に構成される管継手において、
前記接着受口部は内層と外層を有しており、
前記内層に、前記接着受口部の開口側の第１開口部と前記継手本体側の第２開口部を有していて前記樹脂製管部材と接着剤で接着可能な樹脂で成形した環状の受口部材を有しており、
前記外層と前記継手本体はポリオレフィン樹脂を有しており、
前記外層と前記継手本体の少なくともいずれか一方が発泡層を有し、
前記受口部材における前記第２開口部を形成する環状突起の外周側端部に面取り部が形成されていることを特徴とする管継手。 A pipe joint that has a short tubular joint body and a plurality of adhesive sockets provided at the ends of the joint body, and can be bonded and fixed by inserting a resin pipe member into the adhesive socket. In
The adhesive receiving portion has an inner layer and an outer layer, and has an inner layer and an outer layer.
The inner layer has a first opening on the opening side of the adhesive receiving portion and a second opening on the joint body side, and is an annular shape formed of a resin that can be adhered to the resin pipe member with an adhesive. It has a socket member and
The outer layer and the joint body have a polyolefin resin, and the outer layer and the joint body have a polyolefin resin.
At least one of the outer layer and the joint body has a foam layer.
A pipe joint characterized in that a chamfered portion is formed at an outer peripheral end portion of an annular protrusion forming the second opening in the receiving member.

前記管継手は、互いに直交させて交差配置した２つまたは３つの接着受口部を有し、
複数の前記接着受口部の面取り部は互いに対向するように設けられ、
複数の前記接着受口部の間の隙間が、前記継手本体と同一樹脂で中実に形成されている、請求項１に記載された管継手。 The fitting has two or three adhesive sockets that are cross-arranged at right angles to each other.
The chamfered portions of the plurality of adhesive receiving portions are provided so as to face each other.
The pipe joint according to claim 1 , wherein the gap between the plurality of adhesive sockets is solidly formed of the same resin as the joint body.

前記接着受口部の外層は非発泡層からなり、
前記継手本体は非発泡層で構成されていると共に、前記受口部材に突出形成された凸部に近接する位置に前記発泡層が延びて設けられている請求項１に記載された管継手。 The outer layer of the adhesive receiving portion is made of a non-foaming layer.
The pipe joint according to claim 1, wherein the joint body is composed of a non-foaming layer, and the foaming layer is provided at a position close to a convex portion formed so as to project from the receiving member.

前記受口部材の内面は前記第１開口部から第２開口部に向けて次第に縮径されている請求項１から３のいずれか１項に記載された管継手。 The pipe joint according to any one of claims 1 to 3 , wherein the inner surface of the receiving member is gradually reduced in diameter from the first opening to the second opening.