従来、配管の管路の伸縮による応力を吸収させる継手として、図３に示すような伸縮継手が用いられていた（例えば、特許文献１参照）。その構成は、継手本体１１１の一方の端部から接続スリーブ１１２が挿入され、接続スリーブ１１２の端部外周面には継手本体１１１の内面に摺動可能な外面を有する接収部１１３がやや拡径して形成され、接収部１１３に装着されるシールリング１１４によって、接続スリーブ１１２と継手本体１１１とがシールされており、継手本体１１１の一方端部には継手本体１１１から接続スリーブ１１２が抜けるのを防止する袋ナット１１５が螺合され、継手本体１１１の他方端部には袋ナット１１６によって受口１１７が挟持され、継手本体１１１の端面に装着されるシールリング１１８によって継手本体１１１と受口管１１７とがシールされているものであり、かつ継手本体１１１および接続スリーブ１１２の互いに摺接する部分が金属で形成されたものであった。そして、その効果は、クリープの発生を防止でき摺動性の低下を防止できるものであった。
Conventionally, an expansion joint as shown in FIG. 3 has been used as a joint that absorbs stress caused by expansion and contraction of a pipe line (for example, see Patent Document 1). The configuration is such that the connection sleeve 112 is inserted from one end of the joint main body 111, and the receiving portion 113 having an outer surface slidable on the inner surface of the joint main body 111 is slightly enlarged in diameter on the outer peripheral surface of the end of the connection sleeve 112. The connection sleeve 112 and the joint main body 111 are sealed by a seal ring 114 that is formed in this manner and attached to the receiving portion 113, and the connection sleeve 112 comes out of the joint main body 111 at one end of the joint main body 111. A cap nut 115 is screwed together, a receiving port 117 is clamped by the cap nut 116 at the other end of the joint body 111, and the joint body 111 and the port are received by a seal ring 118 attached to the end surface of the joint body 111. The pipe 117 is sealed, and the joint main body 111 and the connecting sleeve 112 are slidably in contact with each other. Were those. And the effect can prevent generation | occurrence | production of creep and can prevent the fall of slidability.
しかしながら、前記伸縮継手には、接続スリーブ１１２と袋ナット１１５との間に隙間１１９があり、隙間１１９から継手本体１１１内に侵入した異物が継手本体１１１と接続スリーブ１１２の摺動部分に堆積することによって、伸縮作動の際に接続スリーブ１１２が動きにくくなったり、固着するなどの作動不良が起こる恐れがあるという問題があった。また、隙間１１９から侵入した異物が継手本体１１１内周面や接続スリーブ１１２の接収部１１３外周面やシールリング１１４を傷付けると、傷付いた部分から流体漏れが発生する恐れがあるという問題があった。
However, the expansion joint has a gap 119 between the connection sleeve 112 and the cap nut 115, and foreign matter that has entered the joint body 111 from the gap 119 accumulates on the sliding portion of the joint body 111 and the connection sleeve 112. As a result, there is a problem that the connection sleeve 112 becomes difficult to move during the expansion / contraction operation, or an operation failure such as fixing may occur. In addition, if foreign matter entering from the gap 119 damages the inner peripheral surface of the joint body 111, the outer peripheral surface of the receiving portion 113 of the connection sleeve 112, or the seal ring 114, there is a possibility that fluid leakage may occur from the damaged portion. It was.
このような隙間１１９からの異物の侵入や堆積を防ぐためには、隙間１１９周辺を定期的に掃除したり、接続スリーブ１１２側（図３では右側）を下に向けて配管を施工する方法が考えられる。しかし、前者は掃除の手間がわずらわしく、作業者によっては掃除を怠る恐れがあり、狭隘な設置現場では掃除ができないことがあるという問題があった。後者は伸縮継手が海岸や温泉地などの環境に設置されていると、海水や温泉水に溶け込んだ成分が気温差などの影響により伸縮継手の周囲に難溶性の物質を析出することがあり、下に向けただけでは析出物の侵入や堆積を防げず、結局は掃除が必要になってしまうという問題があった。
In order to prevent such intrusion and accumulation of foreign matter from the gap 119, a method of periodically cleaning the periphery of the gap 119 or constructing piping with the connection sleeve 112 side (right side in FIG. 3) facing down is considered. It is done. However, the former is troublesome to clean, and depending on the worker, there is a risk that cleaning may be neglected, and there is a problem that cleaning may not be possible in a narrow installation site. In the latter case, when the expansion joint is installed in an environment such as a coast or a hot spring area, a component dissolved in seawater or hot spring water may deposit a poorly soluble substance around the expansion joint due to the effect of temperature differences, There was a problem that it was not possible to prevent the intrusion and accumulation of precipitates just by facing downward, and eventually cleaning was necessary.
上記の問題を解決するためには、図４に示すような防塵カバーを用いる方法があった（例えば、特許文献２参照）。その構成は、両端に自在継手部２１７を有し、これらの間に長さ調節部を有した連結部材２１１と一定間隔を隔てて互いに向き合う２つの配管２１２の端部同士との連結部分を被覆可能な筒状のカバー本体２１３を設け、カバー本体２１３の両端部に締結して配管２１２に対する被覆状態を保持する保護部材２１４と締結バンド２１５からなる固定手段２１６を備えたものであった。また、カバー本体２１３は伸縮性を有するゴム製の芯材と、芯材の両面に張り合わせる伸縮可能な保護シートとで形成されるものであった。その効果は、カバー本体２１３で連結部材２１１と配管２１２の連結部分を被覆するので、連結部材２１１の表面や配管２１２との連結部分に水が溜まらないため、錆を防止して連結部材２１１の耐久性の向上を図ることができるものであった。また、カバー本体２１３を筒状に形成しているので、両端部に固定手段２１６を備えるだけで気密性、水密性を有した固定が容易にできるというものであった。
In order to solve the above problem, there has been a method using a dustproof cover as shown in FIG. 4 (see, for example, Patent Document 2). The structure has universal joint portions 217 at both ends, and covers the connecting portion between the connecting member 211 having a length adjusting portion therebetween and the ends of two pipes 212 facing each other at a predetermined interval. A possible cylindrical cover main body 213 is provided, and a fixing means 216 including a protection member 214 and a fastening band 215 that are fastened to both ends of the cover main body 213 to maintain a covering state of the pipe 212 is provided. The cover main body 213 is formed of a stretchable rubber core material and a stretchable protective sheet that is bonded to both surfaces of the core material. The effect is that the cover main body 213 covers the connecting portion between the connecting member 211 and the pipe 212, so that water does not collect on the surface of the connecting member 211 or the connecting portion with the pipe 212. The durability could be improved. Further, since the cover main body 213 is formed in a cylindrical shape, it is possible to easily perform fixing with airtightness and watertightness only by providing the fixing means 216 at both ends.
実開平５−５９０８４号公報Japanese Utility Model Publication No. 5-59084
特開平１１−９４１８６号公報JP-A-11-94186
しかしながら、図４に示される従来の防塵カバーは、両端に自在継手部２１７を有し、これらの間に長さ調節部を有した連結部材２１１と、互いに向き合う２つの配管２１２の端部同士との連結部を被覆するものであるため、連結部材２１１全体を被覆する必要性があった。そのため、カバー本体２１３を設置する際に種々の問題があった。まず、カバー本体２１３は連結部材２１１施工後に装着されるためカバー本体２１３を装着する工程が増えた。また、カバー本体２１３の長さは施工後の連結部材２１１の面間に合わせる必要があり、施工現場で長さを調節しなければならなかった。また、カバー本体２１３は、連結部材２１１を覆った状態で配管２１２に設けられた保護部材２１４の内面に嵌め込み、締結バンド２１５で固定するので、連結部材２１１の最大径にあわせて製作されたカバー本体２１３の端部を配管２１２の外周と保護部材２１４（配管２１２と略同径の内径を有する）の内周との間に挿通させなければならず、外径の大きい自在継手部２１７を有する連結部材２１１にカバー本体２１３を固定することが困難であった。これらのことから、施工作業が煩雑で余計な手間が増え、施工時間が多くかかるという問題があった。また、カバー本体２１３装着後に連結部材２１１の自在継手部２１７の屈曲作動や伸縮作動を行うと、それに合わせてカバー本体２１３が弾性的に伸縮するが、屈曲作動や伸縮作動に対してカバー本体２１３が伸びてテンションのかかった状態の部分が屈曲や伸縮に反発する方向に力がかかるため、屈曲部や伸縮部の本来の作動機能が低下してしまうという問題があった。また、カバー本体２１３が伸びてテンションのかかった状態の部分はカバー本体２１３の通常時と比較して肉厚が薄くなるため、外部からの衝撃などにより破損しやすくなり、また長期使用によりカバー本体２１３の材質が劣化して伸縮機能が低下し、テンションがかかると破損しやすくなる問題があり、破損すると破損箇所から連結部材２１１内に異物が侵入するという問題があった。
However, the conventional dust-proof cover shown in FIG. 4 has universal joint portions 217 at both ends, a connecting member 211 having a length adjusting portion therebetween, and ends of two pipes 212 facing each other. Therefore, there is a need to cover the entire connecting member 211. Therefore, there are various problems when installing the cover body 213. First, since the cover body 213 is mounted after the connecting member 211 is constructed, the number of processes for mounting the cover body 213 is increased. Further, the length of the cover main body 213 needs to be adjusted between the surfaces of the connecting member 211 after the construction, and the length has to be adjusted at the construction site. Further, since the cover body 213 is fitted into the inner surface of the protective member 214 provided on the pipe 212 in a state of covering the connecting member 211 and is fixed by the fastening band 215, the cover body 213 is manufactured according to the maximum diameter of the connecting member 211. The end of the main body 213 must be inserted between the outer periphery of the pipe 212 and the inner periphery of the protective member 214 (having an inner diameter that is substantially the same diameter as the pipe 212), and has a universal joint portion 217 having a larger outer diameter. It was difficult to fix the cover body 213 to the connecting member 211. For these reasons, there is a problem in that the construction work is complicated and requires extra time and takes a lot of construction time. Further, when the bending operation or the expansion / contraction operation of the universal joint portion 217 of the connecting member 211 is performed after the cover main body 213 is mounted, the cover main body 213 elastically expands / contracts accordingly. Since the force is applied in the direction in which the stretched and tensioned portion repels bending and expansion / contraction, the original operation function of the bending portion and expansion / contraction portion is lowered. Further, since the cover body 213 is stretched and the tensioned portion is thinner than the normal cover body 213, the cover body 213 is easily damaged by an external impact or the like. When the material of 213 deteriorates and the expansion / contraction function is lowered and tension is applied, there is a problem that the material is easily damaged. When the material is damaged, there is a problem that foreign matter enters the connecting member 211 from the damaged part.
本発明は、以上のような従来技術の問題点に鑑みなされたものであり、伸縮管継手内部への外部からの異物の侵入を防ぐと共に、異物により摺動部分が傷付いて流体漏れが発生することを防止し円滑な伸縮作動を行うことができる防塵カバー付伸縮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 the above-described problems of the prior art, and prevents foreign matter from entering the expansion pipe joint from the outside, and the sliding portion is damaged by the foreign matter, resulting in fluid leakage. An object of the present invention is to provide a telescopic pipe joint with a dustproof cover that can prevent this from occurring and can perform a smooth expansion and contraction operation.
本発明の構成を図を参照して説明すると、一方に配管接続部４が設けられ、内部に流路５を有し他方に開口部６を有する本体１と、内部に流路７を有し、本体１の内周に水密状態で摺動可能に嵌合された鍔状のスライド部８と、該スライド部８の外径より小さい外径を有し、スライド部８の摺動により本体１の開口部６から突出可能に設定され、かつ、先端部に配管接続部９が設けられた管部１０とを有するスライド用短管２と、前記本体１の開口部６の端面に配置され、前記スライド部８の外径より小さく、かつ前記管部１０の外径より大きい内径を有し、該管部１０と嵌合しているストッパ部３とを具備するカバー付伸縮管継手において、前記管接続部９の端部に伸縮性を有する防塵カバー１１が固定され、かつ、防塵カバー１１が本体１から突出した管部１０を常に覆うように設けられていることを第一の特徴とする。
The configuration of the present invention will be described with reference to the drawings. A pipe connection portion 4 is provided on one side, a main body 1 having a flow path 5 inside and an opening 6 on the other side, and a flow path 7 inside. The rod-shaped slide portion 8 is fitted to the inner periphery of the main body 1 so as to be slidable in a watertight state, and has an outer diameter smaller than the outer diameter of the slide portion 8. Are arranged on the end face of the opening 6 of the main body 1 and the sliding short pipe 2 having a pipe part 10 which is set so as to be able to protrude from the opening 6 and has a pipe connection part 9 provided at the tip part thereof, In the expandable pipe joint with cover, which has an inner diameter smaller than the outer diameter of the slide part 8 and larger than the outer diameter of the pipe part 10, and comprising the stopper part 3 fitted to the pipe part 10, A dustproof cover 11 having elasticity is fixed to the end of the pipe connecting portion 9, and the dustproof cover 11 is a main body. It is always provided so as to cover the the tubular portion 10 projecting from a first aspect the.
前記防塵カバー１１の形状が、蛇腹状、笠状または筒状のいずれかであることを第二の特徴とする。
A second feature is that the dust-proof cover 11 has a bellows shape, a shade shape, or a cylindrical shape.
前記本体１の配管接続部４の端面に水密状態で配置される鍔付短管１２と、本体１に螺着されるキャップナット１３、１４をさらに具備し、前記ストッパ部３がキャップナット１３により本体１の開口部６の端面に固定され、また、鍔付短管１２が他のキャップナット１４により本体１の配管接続部４の端面に固定されていることを第三の特徴とする。
It further comprises a brazed short tube 12 disposed in a watertight state on the end face of the pipe connection portion 4 of the main body 1 and cap nuts 13 and 14 screwed to the main body 1, and the stopper portion 3 is formed by the cap nut 13. A third feature is that the flanged short tube 12 is fixed to the end surface of the pipe connecting portion 4 of the main body 1 by another cap nut 14 and is fixed to the end surface of the opening 6 of the main body 1.
前記ストッパ部３が前記キャップナット１３と一体的に設けられていることを第四の特徴とする。
A fourth feature is that the stopper portion 3 is provided integrally with the cap nut 13.
本発明において、防塵カバー１１とは、伸縮管継手の内部（本体１内周とスライド用短管２外周との間の隙間）に塵、埃、泥、砂などの外部からの異物の進入を防止させるものである。また、防塵カバー１１の形状における蛇腹状とは山折りとなった山部と谷折りとなった谷部が連続して形成された筒状のものであればよい。また、筒状または笠状の場合、単体の筒または笠でもよく、複数の筒または笠を重ねて連結して設けてもよい。
In the present invention, the dust-proof cover 11 refers to the entry of foreign matter such as dust, dust, mud and sand into the inside of the expansion joint (the gap between the inner periphery of the main body 1 and the outer periphery of the sliding short tube 2). It is something to prevent. Moreover, the bellows shape in the shape of the dust-proof cover 11 should just be a cylindrical thing in which the mountain part turned into a mountain fold and the valley part turned into a valley fold were formed continuously. In the case of a cylinder or a shade, a single cylinder or shade may be used, and a plurality of cylinders or shades may be stacked and connected.
本発明において、鍔付短管１２およびスライド用短管２の各管接続部９、２３と配管との接続は、ソケット接続、ねじ接続、フランジ接続、突合せ接続のいずれでもよく、特に限定されない。
In the present invention, connection between the pipe connecting portions 9 and 23 of the brazed short pipe 12 and the sliding short pipe 2 and the pipe may be any of socket connection, screw connection, flange connection, and butt connection, and is not particularly limited.
また、本発明において防塵カバー付伸縮管継手の本体１の形状は、継手の伸縮作動の妨げにならなければ、チーズ、多方継手、エルボ、ベンド、またはソケットのいずれかのタイプにしても良い。
Further, in the present invention, the shape of the main body 1 of the expansion tube joint with a dustproof cover may be any of cheese, multi-way joint, elbow, bend, or socket as long as it does not hinder the expansion and contraction operation of the joint.
また、本発明において、本体１、スライド用短管２、ストッパ部３、鍔付短管１２、キャップナット１３、１４の材質は金属のほか、必要物性を満たしていれば、ポリ塩化ビニル樹脂（以下、ＰＶＣと記す）、アクリロニトリルブタジエンスチレン共重合体、ポリビニリデンフルオライド、ポリプロピレン（以下、ＰＰと記す）、ポリエチレン（以下、ＰＥと記す）、ポリスチレン、ポリテトラフルオロエチレン、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体などの合成樹脂が好適なものとして挙げられ、特に限定されない。
In the present invention, the material of the main body 1, the sliding short tube 2, the stopper portion 3, the flanged short tube 12, and the cap nuts 13, 14 is made of a polyvinyl chloride resin ( Hereinafter referred to as PVC), acrylonitrile butadiene styrene copolymer, polyvinylidene fluoride, polypropylene (hereinafter referred to as PP), polyethylene (hereinafter referred to as PE), polystyrene, polytetrafluoroethylene, tetrafluoroethylene perfluoro Synthetic resins such as alkyl vinyl ether copolymers are preferred and are not particularly limited.
本発明は以上のような構造をしており、以下の優れた効果が得られる。
（１） 防塵カバーによって伸縮管継手内部への外部からの異物の侵入を防ぐことができ、異物侵入による作動不良や、シール部分を損傷させることがなくなり、流体漏れが防止され、円滑な伸縮作動を維持することができる。
（２） あらかじめ防塵カバーが装着されているので、施工現場で防塵カバーを取付ける工程が不要であり、施工手間が省かれ、施工時間を短縮することができる。
（３） 防塵カバーが蛇腹状、笠状、筒状なので防塵カバー付伸縮管継手の全長が最大になって防塵カバーが伸びた状態でも防塵カバーの厚みは一定に保持されるので、外部からの衝撃に対して破損の心配はない。
（４） 防塵カバーの伸縮管継手への着脱が容易にできる。
The present invention has the structure as described above, and the following excellent effects can be obtained.
(1) The dustproof cover can prevent foreign objects from entering the expansion tube joint from the outside, preventing malfunction due to foreign material intrusion and damaging the seal, preventing fluid leakage and smooth expansion and contraction. Can be maintained.
(2) Since the dustproof cover is attached in advance, the process of attaching the dustproof cover at the construction site is unnecessary, and the construction labor can be saved and the construction time can be shortened.
(3) Since the dustproof cover is bellows-shaped, shade-shaped, and cylindrical, the total length of the expansion joint with dustproof cover is maximized and the thickness of the dustproof cover is maintained even when the dustproof cover is extended. There is no worry of damage against impact.
(4) The dust cover can be easily attached to and detached from the expansion joint.
以下、本発明の実施形態について図面を参照して説明するが、本発明が本実施形態に限定されないことは言うまでもない。
Hereinafter, although an embodiment of the present invention is described with reference to drawings, it cannot be overemphasized that the present invention is not limited to this embodiment.
図１は本発明の第一の実施形態である防塵カバー付伸縮管継手を示す縦断面図、図２は本発明の第二の実施形態である防塵カバー付伸縮管継手を示す縦断面図である。
FIG. 1 is a longitudinal sectional view showing a telescopic pipe joint with a dustproof cover according to the first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a telescopic pipe joint with a dustproof cover according to the second embodiment of the present invention. is there.
以下、図１に基づいて本発明の第一の実施形態である防塵カバー付伸縮管継手について説明する。１はＰＶＣ製の中空円筒状の本体であり、内部に流路５が形成されている。本体１の一端部には後記鍔付短管１２が接続される配管接続部４が設けられている。配管接続部４の外周には後記キャップナット１４が螺着される雄ねじ部が形成され、その端面にはシール部材を装着するための環状溝が設けられている。本体１の他端部は開口部６となっており、後記スライド用短管２がここから挿嵌される。
Hereinafter, an expansion joint with a dustproof cover, which is a first embodiment of the present invention, will be described with reference to FIG. Reference numeral 1 denotes a hollow cylindrical main body made of PVC, and a flow path 5 is formed therein. One end of the main body 1 is provided with a pipe connection portion 4 to which a post-printed short tube 12 is connected. A male thread part to which a later-described cap nut 14 is screwed is formed on the outer periphery of the pipe connection part 4, and an annular groove for mounting a seal member is provided on the end face. The other end of the main body 1 is an opening 6, and a slide short tube 2 to be described later is inserted therein.
２はＰＶＣ製のスライド用短管であり、本体１の開口部６から突出可能に設けられた管部１０と、管部１０の一端部に設けられた外周が本体１の流路５と略同径となる鍔状のスライド部８を有している。スライド部８の外周面には環状溝が設けられ、環状溝にはシールリングが装着され、本体１の流路５の内周面に対しスライド部８が水密状態で摺動可能に設けられている。この構成により本体１の流路５の内周面と管部１０との間に形成される空隙に流体の侵入が防止されるため、流体が本体開口部６から流出することが防止される。管部１０の他端部には、他の配管が接続される管接続部９が設けられており、また、スライド用短管２の内部には前記本体１の流路５と連通する流路７が設けられている。
Reference numeral 2 denotes a PVC short tube for sliding, a tube portion 10 provided so as to be able to protrude from the opening 6 of the main body 1, and an outer periphery provided at one end of the tube portion 10 is substantially the same as the flow path 5 of the main body 1 It has a bowl-shaped slide portion 8 having the same diameter. An annular groove is provided on the outer peripheral surface of the slide portion 8, and a seal ring is mounted on the annular groove, and the slide portion 8 is slidably provided in a watertight state with respect to the inner peripheral surface of the flow path 5 of the main body 1. Yes. With this configuration, the fluid is prevented from entering the gap formed between the inner peripheral surface of the flow path 5 of the main body 1 and the pipe portion 10, and therefore the fluid is prevented from flowing out from the main body opening 6. The other end portion of the tube portion 10 is provided with a tube connection portion 9 to which other piping is connected, and a flow passage communicating with the flow passage 5 of the main body 1 is provided in the slide short tube 2. 7 is provided.
３はＰＶＣ製の鍔付短管形状のストッパ部であり、スライド用短管２が本体１から抜け出るのを防止するものである。その内周はスライド用短管２のスライド部８の外径より小さく、管部１０の外径より大きく形成され、本体１の開口部６の外周に螺着される後記キャップナット１３により、ストッパ部３の鍔部が本体１の開口部６の端面に挟持固定されている。なお、本実施形態ではストッパ部３は鍔付短管形状となっているが、スライド用短管２が本体１から抜け出るのを防止できる形状であれば特に限定されず、半割となった鍔付短管形状でもよく、円環形状でもよい。また、部品点数を減らすためにキャップナット１３と一体的に設けても良い。
Reference numeral 3 denotes a PVC short tube-shaped stopper, which prevents the sliding short tube 2 from coming out of the main body 1. The inner periphery thereof is smaller than the outer diameter of the slide portion 8 of the slide short tube 2 and larger than the outer diameter of the tube portion 10, and is stoppered by a cap nut 13 which is screwed onto the outer periphery of the opening 6 of the main body 1. The flange portion of the portion 3 is clamped and fixed to the end face of the opening 6 of the main body 1. In this embodiment, the stopper portion 3 has a flanged short tube shape, but is not particularly limited as long as it is a shape that can prevent the sliding short tube 2 from coming out of the main body 1. An attached short tube shape or an annular shape may be used. Moreover, in order to reduce the number of parts, it may be provided integrally with the cap nut 13.
１１はＰＰ製の山部と谷部が連続して設けられた蛇腹状の防塵カバーである。防塵カバー１１の一端はスライド用短管２の管接続部９の外径と略同径の内周面を有し、後記締結バンド１５によって管接続部９の端部外周に固定され、他端はストッパ部３の後記キャップナット１３から露出した部分の外径と略同径の内周面を有し、後記締結バンド１５によってストッパ部３の同部分に固定されている。また、本実施形態では、防塵カバー１１の端部は管接続部９とストッパ部３に固定されているが、管部１０の外周と、ストッパ部３とスライド用短管２の隙間を覆うことができればストッパ部３に限定されず、後記キャップナット１３または本体１のいずれに固定されてもよく、特に限定されない。防塵カバー１１の材質としては、繰り返し曲げ特性に優れ、丈夫で軽量なものが良く、例えば、ＰＰ、ＰＥ、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体などの合成樹脂が好適なものとして挙げられるが、エチレンプロピレンジエンターポリマー、フッ素ゴムなどのゴム製の弾性体や前記材質と金属や繊維などとの複合材料などでもよく、特に限定されない。
11 is a bellows-shaped dust-proof cover provided with PP crests and troughs continuously. One end of the dust-proof cover 11 has an inner peripheral surface that is substantially the same diameter as the outer diameter of the tube connecting portion 9 of the sliding short tube 2, and is fixed to the outer periphery of the end of the tube connecting portion 9 by a fastening band 15 described later. Has an inner peripheral surface that is substantially the same as the outer diameter of the portion exposed from the cap nut 13 to be described later of the stopper portion 3, and is fixed to the same portion of the stopper portion 3 by a fastening band 15 to be described later. Moreover, in this embodiment, although the edge part of the dust-proof cover 11 is being fixed to the pipe connection part 9 and the stopper part 3, it covers the outer periphery of the pipe part 10, and the clearance gap between the stopper part 3 and the short tube 2 for a slide. If it can, it will not be limited to the stopper part 3, and it may be fixed to either the cap nut 13 or the main body 1 which will be described later, and is not particularly limited. The material of the dust cover 11 is preferably a material that is excellent in repeated bending characteristics and is strong and lightweight. For example, a synthetic resin such as PP, PE, or a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer is preferable. However, it may be an elastic body made of rubber such as ethylene propylene diene terpolymer or fluororubber, or a composite material of the material and metal or fiber, and is not particularly limited.
１２はＰＶＣ製の鍔付短管であり、一端部に他の配管が接続される管接続部２３が設けられ、他端部には前記本体１の開口部１６と略同径の流路が設けられている。本体１の配管接続部４の外周に螺着される後記キャップナット１４と鍔部で係合することにより鍔付短管１２の鍔部が本体１の開口部１６の端面に挟持固定されている。
Reference numeral 12 denotes a PVC short pipe, which is provided with a pipe connecting part 23 to which another pipe is connected at one end, and a flow path having substantially the same diameter as the opening 16 of the main body 1 at the other end. Is provided. The flange portion of the flanged short tube 12 is clamped and fixed to the end surface of the opening portion 16 of the main body 1 by engaging with a cap nut 14 to be described later, which is screwed onto the outer periphery of the pipe connection portion 4 of the main body 1. .
１３、１４はＰＶＣ製のキャップナットであり、一方の端部内周に本体１の両端部外周に設けられた雄ねじ部に螺着される雌ねじ部が設けられており、もう一方の端部には内周側方向へ突出する内鍔部が設けられている。
Reference numerals 13 and 14 are PVC cap nuts, each of which has a female screw portion screwed to a male screw portion provided on the outer periphery of both ends of the main body 1 on the inner periphery of one end portion. An inner collar portion protruding in the inner circumferential direction is provided.
１５はステンレス製の締結バンドであり、帯状のバンドと締め付け部から構成され、防塵カバー１１の端部外周に装着して締め付けることにより防塵カバー１１を前記位置に固定する。なお、本実施形態では、防塵カバー１１の固定に締結バンド１５が使用されているが、防塵カバー１１が固定できれば接着、溶着、または差込式などの方法でもよく、特に限定されない。また、本実施形態では、ステンレス製の締結バンド１５を使用しているが、防塵カバー１１の固定ができれば合成樹脂製やゴム製の締結バンドでもよく特に限定されない。
A stainless steel fastening band 15 is composed of a belt-like band and a fastening part, and is attached to the outer periphery of the end part of the dust-proof cover 11 and fastened to fix the dust-proof cover 11 at the above position. In the present embodiment, the fastening band 15 is used to fix the dust-proof cover 11. However, as long as the dust-proof cover 11 can be fixed, a method such as adhesion, welding, or insertion may be used, and the method is not particularly limited. Further, in the present embodiment, the stainless steel fastening band 15 is used. However, as long as the dustproof cover 11 can be fixed, the fastening band made of synthetic resin or rubber may be used and is not particularly limited.
次に防塵カバー１１の伸縮管継手への装着方法について説明する。
まず、伸縮管継手を組み立てた後、ストッパ部３から突出した管部１０に、予め両端部に締結バンド１５を各々装着した防塵カバー１１をかぶせる。次に、防塵カバー１１の一端を管接続部９の端部外周に、他端をストッパ部３のキャップナット１３から突出した部分の外周に位置を合わせ、各々の締結バンド１５を締め付けることによって防塵カバー１１を伸縮管継手に固定する。このとき、防塵カバー１１の所定の固定位置に標線や嵌合溝または突起などの目印を設けておくと防塵カバー１１の位置決めが容易となり、装着時間の短縮ができる。防塵カバー１１の両端の内径は防塵カバー１１を固定する部位の外径と略同径となっているため、防塵カバー１１を伸縮管継手に装着する際に、防塵カバー１１の端部を拡径したり縮径したりする必要がなく、装着が容易である。
Next, a method for attaching the dustproof cover 11 to the expansion joint will be described.
First, after assembling the expansion pipe joint, the dust cover 11 having the fastening bands 15 respectively attached to both ends in advance is put on the pipe portion 10 protruding from the stopper portion 3. Next, one end of the dustproof cover 11 is aligned with the outer periphery of the end of the pipe connecting portion 9, the other end is aligned with the outer periphery of the portion protruding from the cap nut 13 of the stopper portion 3, and each fastening band 15 is tightened to prevent dust. The cover 11 is fixed to the expansion joint. At this time, if a mark such as a marked line, a fitting groove or a protrusion is provided at a predetermined fixing position of the dust-proof cover 11, the dust-proof cover 11 can be easily positioned and the mounting time can be shortened. Since the inner diameter of both ends of the dust cover 11 is substantially the same as the outer diameter of the portion where the dust cover 11 is fixed, the end of the dust cover 11 is expanded when the dust cover 11 is attached to the expansion joint. It is not necessary to reduce or reduce the diameter and is easy to install.
次に本実施形態の作用について説明する。防塵カバー付伸縮管継手に接続されている配管（図示せず）が、流体の温度や気温の上昇などによって、軸方向に膨張した時、スライド用短管２のスライド部８の外周面が本体１の流路５の内周面と水密状態で摺動しながら、配管の熱膨張分だけ相対的に内部側に移動する。これにより配管の熱膨張による応力を防塵カバー付伸縮管継手で吸収することができる。このとき、防塵カバー１１は蛇腹の山部の底辺を狭めるようにして防塵カバー１１の全長を縮め、スライド用短管２の作動に追随する。また、配管が前記とは逆に温度の低下により収縮した時には、熱膨張のときとは反対に作用してスライド用短管２が収縮分だけ相対的に外側に移動して、配管の収縮による応力を吸収することができる。このとき、防塵カバー１１も配管の熱膨張のときとは反対に作用して蛇腹の山部の底辺を広げるようにして防塵カバー１１の全長を伸ばし、スライド用短管２の作動に追随する。なお、防塵カバー付伸縮管継手の伸縮するストロークはスライド用短管２のスライド部８端面が本体１の流路５の端面に当接する位置が最短となり、スライド部８の管部側端面がストッパ部３に当接する位置が最長となる。
Next, the operation of this embodiment will be described. When a pipe (not shown) connected to an expansion joint with a dustproof cover expands in the axial direction due to an increase in fluid temperature or temperature, the outer peripheral surface of the sliding portion 8 of the sliding short tube 2 is the main body. While sliding in a watertight state with the inner peripheral surface of one channel 5, it moves relatively inward by the amount of thermal expansion of the pipe. Thereby, the stress due to the thermal expansion of the pipe can be absorbed by the expansion joint with the dustproof cover. At this time, the dust-proof cover 11 reduces the overall length of the dust-proof cover 11 by narrowing the bottom of the bellows crest, and follows the operation of the sliding short tube 2. Also, when the piping contracts due to a decrease in temperature, contrary to the above, the sliding short tube 2 moves to the outside by the amount corresponding to the contraction due to the contraction of the piping. It can absorb stress. At this time, the dust-proof cover 11 also acts in the opposite direction to the thermal expansion of the pipe to widen the bottom of the bellows crest, thereby extending the entire length of the dust-proof cover 11 and following the operation of the sliding short tube 2. It should be noted that the expansion / contraction stroke of the expansion joint with the dustproof cover is the shortest where the end surface of the slide portion 8 of the sliding short tube 2 abuts the end surface of the flow path 5 of the main body 1 and the end surface of the slide portion 8 on the tube portion side is the stopper. The position in contact with the portion 3 is the longest.
以上の説明からわかるように、本発明の防塵カバー付伸縮管継手は、防塵カバー１１によって伸縮管継手のスライド用短管２とストッパ部３の隙間とストッパ部３から突出したスライド用短管２の管部１０を覆うものであり、特に水密状態で摺動する箇所への異物の侵入を防ぐため、水や泥水の飛散が多い設置環境や、塵や埃の多い設置環境で好適に使用することができる。そのため異物の侵入による作動不良や、従来のような侵入した異物によるシールリングの損傷が原因となる流体漏れを防ぐことができる。また、防塵カバー１１を伸縮管継手に装着した状態で製品として出荷することができるので、施工現場で防塵カバー１１を取付ける工程が不要となり、施工手間を省き、施工時間を短縮することができる。また、防塵カバー１１が蛇腹状になっていると、スライド用短管２のストロークに追従するように防塵カバー１１の蛇腹の山部の底辺を広げたり狭めたりすることで伸縮するため、防塵カバー１１に伸縮管継手の伸縮に反発するテンションがかからないので伸縮管継手の本来の機能を低下させることがない。また、蛇腹状であれば防塵カバー付伸縮管継手が最大限に伸ばされたときでも防塵カバー１１の厚みは一定に保持されるので、外部からの衝撃に対して心配する必要がない。
As can be seen from the above description, the expansion tube joint with a dustproof cover of the present invention has a sliding short tube 2 protruding from the stopper portion 3 and the gap between the sliding short tube 2 and the stopper portion 3 of the expansion tube joint by the dustproof cover 11. It is suitable for use in installation environments where there is a lot of scattering of water or muddy water, or installation environments where there is a lot of dust or dust, especially in order to prevent intrusion of foreign matter into a place that slides in a watertight state. be able to. For this reason, it is possible to prevent fluid leakage caused by malfunction due to entry of foreign matter or damage of the seal ring caused by foreign matter that has entered. In addition, since the dustproof cover 11 can be shipped as a product with the expansion joint being mounted, the process of attaching the dustproof cover 11 at the construction site is not required, and the construction work can be saved and the construction time can be shortened. Further, when the dustproof cover 11 has a bellows shape, the dustproof cover 11 expands and contracts by expanding or narrowing the bottom of the bellows of the bellows of the dustproof cover 11 so as to follow the stroke of the sliding short tube 2. 11 is not subjected to tension that repels expansion and contraction of the expansion pipe joint, so that the original function of the expansion pipe joint is not deteriorated. Moreover, since the thickness of the dust-proof cover 11 will be kept constant even when the expansion joint with dust-proof cover is extended to the maximum if it has a bellows shape, there is no need to worry about external impact.
次に、図２に基づいて本発明の第二の実施形態である防塵カバー付伸縮管継手について説明する。本実施形態では第一の実施形態と同じ構成要素については同一符号を付して示す。
Next, an expansion joint with a dustproof cover, which is a second embodiment of the present invention, will be described with reference to FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.
１７はＰＥ製の筒状の防塵カバーであり、主短管２１と、主短管２１に挿入される複数の短管（第一〜第四短管１８、１９、２４２５）とから構成され、径の大きい短管に径の小さい該短管が連続して収納されるようになっている。防塵カバー１７の一端となる最小の径の第一短管１８の一端部はスライド用短管２の管接続部９の外径と略同径の内周面を有し、締結バンド１５によって管接続部９の端部外周に固定され、一方、他端となる主短管２１の端部はストッパ部３のキャップナット１３から露出した部分の外径と略同径の内周面を有し、締結バンド１５によってストッパ部３の同部分に固定されている。第一〜第四短管１８、１９、２４、２５の両端部外周には環状突起が形成され、主短管と第二〜第四短管１９、２４、２５の管接続部９側（図２の右側）の一端部内周には環状突起が形成され、隣り合う該短管の外周の環状突起と内周の環状突起が係合可能に設けられている。また、該環状突起と、該短管の外周面または内周面は摺動可能に設けられ、防塵カバー１７は軸線方向に伸縮可能となっている。
17 is a cylindrical dustproof cover made of PE, which is composed of a main short tube 21 and a plurality of short tubes (first to fourth short tubes 18, 19, 2425) inserted into the main short tube 21, The short pipe having the small diameter is continuously accommodated in the short pipe having the large diameter. One end portion of the first short tube 18 having the smallest diameter, which becomes one end of the dust cover 17, has an inner peripheral surface substantially the same diameter as the outer diameter of the tube connecting portion 9 of the sliding short tube 2. The end of the main short tube 21 that is fixed to the outer periphery of the end of the connecting portion 9 and the other end has an inner peripheral surface that is substantially the same as the outer diameter of the portion exposed from the cap nut 13 of the stopper portion 3. The fastening band 15 is fixed to the same portion of the stopper portion 3. An annular protrusion is formed on the outer periphery of both ends of the first to fourth short tubes 18, 19, 24, 25, and the main short tube and the second to fourth short tubes 19, 24, 25 on the tube connecting portion 9 side (see FIG. An annular protrusion is formed on the inner periphery of one end of the right side of 2, and an annular protrusion on the outer periphery of the adjacent short pipe and an annular protrusion on the inner periphery are provided to be engageable with each other. The annular projection and the outer peripheral surface or inner peripheral surface of the short pipe are slidably provided, and the dust cover 17 can be expanded and contracted in the axial direction.
なお、本実施形態では、防塵カバー１７の端部は管接続部９とストッパ部３に固定されているが、管部１０の外周と、ストッパ部３とスライド用短管２の隙間を覆うことができればストッパ部３に限定されず、キャップナット１３または本体１のいずれに固定されてもよく、特に限定されない。また、本実施形態では防塵カバー１７は筒状をしているが、笠状でもよく、特に限定されない。防塵カバー１７の材質としては摺動特性に優れ、丈夫で軽量なものが良く、例えば、ＰＥ、ポリアセタール、ポリテトラフルオロエチレン、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体などの合成樹脂が好適なものとして挙げられる。
In the present embodiment, the end of the dustproof cover 17 is fixed to the pipe connecting part 9 and the stopper part 3, but covers the outer periphery of the pipe part 10 and the gap between the stopper part 3 and the sliding short pipe 2. If it can, it will not be limited to the stopper part 3, You may fix to either the cap nut 13 or the main body 1, and it does not specifically limit. In the present embodiment, the dustproof cover 17 has a cylindrical shape, but may have a shade shape and is not particularly limited. The material of the dust cover 17 is excellent in sliding characteristics, strong and light, and is preferably a synthetic resin such as PE, polyacetal, polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer. It is mentioned as a thing.
本体１、スライド用短管２、ストッパ部３、キャップナット１３、１４、鍔付短管１２、締結バンド１５の構成は前記第一の実施形態と同様なので説明を省略する。
Since the configurations of the main body 1, the sliding short tube 2, the stopper portion 3, the cap nuts 13 and 14, the flanged short tube 12 and the fastening band 15 are the same as those in the first embodiment, description thereof will be omitted.
次に防塵カバー１７の伸縮管継手への装着方法について説明する。
伸縮管継手を組み立てた後、ストッパ部３から突出した管部１０に、予め両端部に締結バンド１５を各々装着した防塵カバー１７をかぶせ、防塵カバー１７の一端を管接続部９の端部外周に、他端をストッパ部３のキャップナット１３から突出した部分の外周に位置を合わせ、各々の締結バンド１５を締め付けることによって防塵カバー１７を固定する。このとき、所定の固定位置に標線や嵌合溝または突起などの目印を設けておくと防塵カバー１７の位置決めが容易となり装着時間の短縮できる。防塵カバー１７の両端の内径は防塵カバー１７を固定する部位の外径と略同径であるため、防塵カバー１７を伸縮管継手に装着する際に端部を拡径したり縮径したりする必要がなく、装着が容易である。
Next, a method for attaching the dust cover 17 to the expansion joint will be described.
After assembling the expansion joint, the tube portion 10 protruding from the stopper portion 3 is covered with a dust-proof cover 17 having the fastening bands 15 respectively attached to both ends in advance, and one end of the dust-proof cover 17 is connected to the outer periphery of the end of the tube connection portion 9. The dust-proof cover 17 is fixed by aligning the other end with the outer periphery of the portion protruding from the cap nut 13 of the stopper portion 3 and tightening each fastening band 15. At this time, if a mark such as a marked line, a fitting groove or a protrusion is provided at a predetermined fixed position, the dust cover 17 can be easily positioned and the mounting time can be shortened. Since the inner diameter of both ends of the dust cover 17 is substantially the same as the outer diameter of the portion where the dust cover 17 is fixed, the end of the dust cover 17 is expanded or contracted when the dust cover 17 is attached to the expansion joint. It is not necessary and easy to install.
次に本実施形態の作用について説明する。第一の実施形態と同様にカバー付伸縮管継手に接続されている配管（図示せず）が、流体の温度や気温の上昇などによって、軸方向に膨張すると、スライド用短管２が配管の熱膨張分だけ相対的に内部側に移動する。このとき防塵カバー１７は、複数の短管１８、１９、２１、２４、２５のうち、まずスライド用短管２に固定された第一短管１８がスライド用短管２に追随して第二短管１９に収納される。そして、第一短管１８の固定された側の一端部外周の環状突起２０が第二短管１９内周の環状突起２６に係合すると、第二短管１９は第一短管１８に連動して第三短管２４に収納されるようにスライドする。伸縮管継手がさらに短くなると、同様に第三短管２４が第四短管２５に、第四短管２５が主短管２１に収納されるようにスライドする。また、配管が前記とは逆に温度の低下により収縮した時には、熱膨張のときとは反対に作用してスライド用短管２が収縮分だけ相対的に外側に移動してカバー付伸縮管継手を長くさせる。このとき、防塵カバー１７も配管の熱膨張のときとは反対に作用する。すなわち、第一短管１８がスライド用短管２に追随して防塵カバー１７内から相対的に引き出され、第一短管１８の固定されない側の他端部外周の環状突起２２が第二短管１９内周の環状突起２６に係合すると、第一短管１８に連動して防塵カバー１７内から相対的に引き出される。さらにスライド用短管２が長くなると、同様に第三、第四短管２４、２５が追随して引き出される。
Next, the operation of this embodiment will be described. Similarly to the first embodiment, when a pipe (not shown) connected to the expansion / contraction pipe joint with cover expands in the axial direction due to an increase in fluid temperature or temperature, the sliding short pipe 2 is connected to the pipe. It moves to the inner side relatively by thermal expansion. At this time, among the plurality of short tubes 18, 19, 21, 24, 25, the dust-proof cover 17 first follows the first short tube 18 fixed to the slide short tube 2 following the slide short tube 2. Housed in a short tube 19. When the annular protrusion 20 on the outer periphery of one end of the first short tube 18 is engaged with the annular protrusion 26 on the inner periphery of the second short tube 19, the second short tube 19 is interlocked with the first short tube 18. Then, it is slid so as to be stored in the third short tube 24. When the expansion joint is further shortened, similarly, the third short tube 24 slides into the fourth short tube 25 and the fourth short tube 25 slides into the main short tube 21. Also, when the pipe contracts due to a decrease in temperature, contrary to the above, the sliding short pipe 2 moves to the outside by the amount corresponding to the contraction and the expansion pipe joint with cover is operated in the opposite direction to the thermal expansion. Make it longer. At this time, the dust cover 17 also acts in the opposite direction to the thermal expansion of the piping. That is, the first short pipe 18 follows the sliding short pipe 2 and is relatively pulled out from the inside of the dust-proof cover 17, and the annular projection 22 on the outer periphery of the other end of the first short pipe 18 is fixed to the second short pipe 18. When engaged with the annular protrusion 26 on the inner periphery of the tube 19, the tube 19 is pulled out relatively from the dust-proof cover 17 in conjunction with the first short tube 18. Further, when the sliding short tube 2 becomes longer, the third and fourth short tubes 24 and 25 are similarly pulled out.
