JP3651692B2

JP3651692B2 - Different diameter rubber pipe joint and manufacturing method thereof

Info

Publication number: JP3651692B2
Application number: JP33052594A
Authority: JP
Inventors: 志津雄横堀
Original assignee: Toyo Tire and Rubber Co Ltd
Current assignee: Toyo Tire Corp
Priority date: 1994-12-06
Filing date: 1994-12-06
Publication date: 2005-05-25
Anticipated expiration: 2020-05-25
Also published as: JPH08159349A

Description

【０００１】
【産業上の利用分野】
建造物の冷暖房等に用いる給水給湯ポンプの出口側に取付け、ポンプの振動による変位や施工による取り付け誤差を吸収するゴム製配管継手に関する。
【０００２】
【従来の技術】
一般に給水ポンプは出口側は流速が大きく、配管の経済流速を低下させる為、鋳鉄製又は鋼製異径管（レジューサー）をポンプの出口直上に取り付ける（図３）。該金属製異径管は多くが１サイズ差（例えば片側１５０mm、他側２００mm径）となり、流体をスムーズに流し圧力損失を少なくする様に滑らかな内径変化を有し、両端には所定のフランジが設けられている。小口径側フランジはポンプ出口に締結され、大口径側フランジは同径のゴム配管継手を介して、これに続く配管に接続され使われている。
【０００３】
【発明が解決しようとする課題】
１）一般にポンプの排出側は垂直状態にあり、ポンプ出口から異径管、同径ゴム配管継手、逆止弁（及びバルブ）そして配管という順に接続されるが、限られた配管空間（高さ）の中でこれらの部品を全て配置し、組み立てることは非常に困難な作業になり、又バルブ等の操作や保守作業が行い難くなる。このため、配管部品の取付空間を少なくする事が第一の課題である。
２）これらの多くの配管部品は一般にフランジ接続されるが、それぞれの部品には製作上の公差が有り、又取付時の組立誤差も発生する。加えて流体の温度変化や外気温度の変化による配管の熱伸縮が発生する。ポンプにはその回転振動が床面に伝わらないように防振装置によって支えられているので、ポンプと配管の間で揺れも発生する。これらの製作公差、組立誤差、熱伸縮、ポンプの振動を全て吸収する為に、ゴム配管継手を用いるが、限られた空間内で長尺なものを使用する事が出来ないのでこの種々の大きな撓みを吸収することは困難である。
【０００４】
【課題を解決するための手段】
上記課題を解決するために鋭意研究した結果、本発明に到達したもので、すなわちこれらの問題に対し異径管が剛体であることに注目し、可撓継手である同径ゴム配管継手を異径管のような異径のゴム配管継手にすることで、この両方を解決することを考え出したものである。すなわち給水ポンプの出口側に取り付ける配管変位吸収用のゴム製配管継手であり、流体の入口側を小口径に、排出側を大口径とすると共に、その間に膨らみをもたせた球形状をなす異径のゴム配管継手であり、異径のゴム配管継手にすることで、第一の課題については、従来の異径管の分だけ組み込み高さが低くなるので、配管及び配管部品の取付作業が容易になり、頻度の高いバルブ操作及び、その保守作業が低い位置で行う事が出来るようになる。加えて異径ゴム配管継手の強度及び形状対応力を保持させるために、未加硫ゴムシートと未加硫ゴムを被覆したスダレ織りの補強繊維層を一方向ずつ交互にスダレ方向を違えて貼り合わせた、積層成形物を加硫して得られる異径のゴム配管継手において、スダレ状の補強層の繊維の方向が異径ゴム配管継手の軸線に対し全ての部位で同一角度で配列する異径ゴム配管継手であり、加えて未加硫ゴムで被覆したスダレ状の補強層を扇状の形状にして扇の外縁と内縁に相当するそれぞれの円弧の部分は、該スダレ状補強層の貼付幅を大口径の円周の長さにして大きく、小口径の円周の長さにして小さく、扇の内弧から外弧にかけて、スダレ密度を連続的に拡げ、異径ゴム管状体の軸線に対して一定の補強角度をなすように螺旋形状に繊維層の方向を配列した補強繊維層を角度方向に合わせて該扇形状補強繊維スダレコードを異径管にスダレ方向を交互に違えて偶数枚貼り付け加硫し、繊維層の補強角度を一定にした異径ゴム配管継手であり、その製造方法である。
【０００５】
ゴム配管継手は、一般に繊維層で補強したゴム管状体を両端部でフランジ固定又は、ルーズ保持してなり、配管途中に接続して流体を保持しながら、管路の伸縮、偏心及び捩じり等の変位を許容させるため、この補強繊維層はゴム管状体の軸線に対して、３０〜７０°の傾き角度でスダレ状の繊維層を交互に偶数プライ配列して形成されている。通常のゴム配管継手或いは、ゴムホースは両端の直径が同じであるため、スダレ状繊維層は一定幅の平行四辺形の形状のものを用いることができる。
従って、貼付け配列後の繊維層はゴム管状体の軸線に対して予め設定した角度は各部位で一定になる。
【０００６】
一方、本発明の異径ゴム配管継手では、両端部で直径が異なるため、一定幅の平行四辺形状の繊維層を貼り合わせることが出来ない。
この問題を解決するため、スダレ状繊維層を扇状の形状にして、扇の外縁と内縁に相当する、それぞれの弧の部分は、異径ゴム配管継手のそれぞれ大径側、小径側の円周長に等しくし、この内弧から外弧にかけて、スダレ密度を連続的に拡げると共に、これを貼り付けた時、異径ゴム管状体の軸線に対して一定の補強角度をなすよう、予め設定した螺旋形状に繊維層の方向を配列した補強繊維層を用意し、それを角度の方向に合わせて交互に貼付け、繊維層の補強角度を一定にすることが出来た。
【０００７】
これにより、流体の圧力が作用した時、異径ゴム配管継手には局部的変形を生起することなく、又伸縮、偏心、捩じりが加っても、異径ゴム配管継手全体で変位を吸収する事ができるので、大きな撓み変位を許容する異径ゴム配管継手を提供することができた。
又、小径側から大径側に緩やかに直径も変化し、異径管としての圧力損失もなく、従来の剛体の異径管は不要になり、全体として、取付空間は減少し組立誤差も少なくなり、取付け高さも低くなることから、配管のバルブ操作や保守点検もこの分容易にできるようになった。
【０００８】
【作用】
従来の金属製異径管・同径ゴム配管継手の代わりに２つの機能を異径ゴム配管継手にしたことで、従来の異径管の分だけ組み込み高さが低くなるので、配管及び配管部品の取付作業が容易になり、頻度の高いバルブ操作及び、その保守作業が低い位置で行うことが出来るようになる。異径管そのものを異径ゴム配管継手にすることで、取付空間に余裕が生まれ、ポンプとそれに接続する配管の間で、発生する様々の変位を吸収する異径のゴム配管継手の設計の自由度が大きくなり、大きな撓み変位を許容し、同時に異径管の機能も発揮する。
【０００９】
本発明を図面に基づいて説明する。図２は従来の同径ゴム配管継手７の片断面図であり、図３はポンプからの配管方法を示し、ポンプの吐出口に鋳鉄又は鉄製の異径管（レジューサー）８、管路の伸縮、偏心、捩じり、曲げ変位を吸収する可撓管継手である同径ゴム配管継手７に、逆止弁６の順で配管に連結されている。
これに対して、図１は本発明の異径ゴム配管継手１０の片断面図で、図４は本発明の異径ゴム配管継手１０の配管構成を示す説明図であり、従来の異径管の位置に異径管の機能を有した異径ゴム配管継手１０を配置し、撓み変位の吸収と異径管としてのポンプ配管の役割を果たすものである。本発明は図３の金属製異径管８と同径ゴム配管継手７を一つにまとめて図４の本発明の異径ゴム配管継手１０に一括成形したので、ポンプと管の間の部品の数は３から２個に減り、高さ方向の空間が減少し、逆止弁（又はバルブ）６の位置も低くなっている。
【００１０】
図５及び図６は本発明の異径管の繊維層の貼付け角度の説明を理解し易くするため、従来の同径ゴム配管継手７のスダレコード１１の貼付け形状を説明するための概略図で、この場合は、同径のゴム管状体の軸線に対し一定の補強角を与え一定幅の平行四辺形のスダレ状繊維層を貼り付ければ、図７及び図８に示すように軸線方向のどの位置でも同じ補強角度が得られることを示している。すなわち、未加硫ゴムを被覆したスダレコード１１を図５の形状の補強コードの１プライ（３プライ、５プライ）目のゴム被覆スダレコードとして、図６の形状の補強コードの２プライ（４プライ、６プライ）目のゴム被覆スダレコードとしてスダレコード１３が交互に７０度近くで被覆加硫するようにゴム被覆スダレコードを貼り、加硫して補強コード２となる。
【００１１】
図９及び図１０は本発明の異径ゴム配管継手１０に貼り合わせる異径管ゴム被覆スダレコード１２の形状を説明する為の概略図で、異径ゴム配管継手では入口側の小口径の直径はＤ₂で排出側の大口径の直径はＤ₃と異なるため、スダレ状繊維層２は図９及び図１０に示すように扇状の形状にして、扇の外縁と内縁に相当する、それぞれの円弧の部分は、異径管ゴム被覆スダレコード１２の大口径貼付け部はπＤ₃で、小口径貼付け部はπＤ₂で示すように異径ゴム配管継手の大径Ｄ₃、小径Ｄ₂の円周長に等しくし、この内弧（ａｂ）から外弧（ｃｄ）にかけて、スダレ密度を連続的に拡げると共に、これを貼り付けた時、異径ゴム管状体の軸線に対して一定の補強角度αをなすよう、予め設定した螺旋形状になるよう各位置の接線角度をβ₀〜βまで変えて繊維層の方向を配列した繊維補強層を用意して、それを角度の向きに交互に偶数プライ貼り合わせ、繊維層の補強角度一定の異径ゴム配管継手を作ることを可能にした。
【００１２】
図１１及び図１３は図１に示す補強コードの形状を、図９及び図１０と同じ様に簡易的に表わしたもので図１に示すように補強コード層は、小径〜大径にかけて、滑らかに湾曲した断面形状をしている。これは異径管ゴム配管継手に流体圧が作用した状態で、伸縮、偏心、捩じりに対して変形し易いように形状を選定している。従って、小径〜大径にかけて、断面形状は湾曲して変化させてある。このため、補強コードの平面形状は図１１及び図１３の扇状ｅ・ｆ・ｇ・ｈであるが、湾曲しているため、図１１のＡ−Ａ断面に示すように膨らみｓがあり、平らな形にはならない、そのため、このような立体形状の補強コード層を用意することは、難しく、コストアップの要因にもなるので、本発明は、図９及び図１０のように補強コード層を平面形状で用意出来る形状で貼り付け、加硫時に内側から圧力をかけて、補強コード層の断面が、湾曲形状になるよう膨らませている。
従って、図１、図１１及び図１３の補強コード層の異径ゴムフレキの軸線に対する補強角αｎは厳密には各位置で一定ではないが、図９及び図１０の形状では、これが一定になるように設定してあるので、図１１及び図１３の形状で補強角度が、湾曲の形状効果で多少ずれることがあるが、実用上は問題のない範囲である。
【００１３】
【実施例】
実施例について、図１を基に説明を加えると、まず、内層ゴム（インナーゴム）３の回りに本発明の方法で、偶数プライの補強コード（繊維）層を交互に貼り付け、大小両端の固体輪（ソリッドリング）４にターンアップして固定し、その上に外層ゴム（カバーゴム）１を貼り、予めその位置に準備された、金属製異径管の小径フランジ１５０ｍｍの内径、大径２００ｍｍの内径を固定又は、ルーズで配置して構成し、全長２００ｍｍとした。（図１参照）
一方本発明の異径管タイプのゴム配管継手は図４の如き取付を行い、ゴム配管継手は金属製異径管と同寸法の小径側内径１５０ｍｍ、大径側内径２００ｍｍとし、ゴム配管継手の性能比較は表１に示した。
【表１】

【００１４】
このように、本発明の異径ゴム配管継手を用いたとき、許容変位量が２５〜４０％も大きくとれるようになり、且つ、加圧したときも均一な形状を保持し、取付高さも低下して、操作性も向上した。
【００１５】
なお使用ゴムは内外層ゴム共、ＥＰＤＭ（エチレンプロピレンジエンゴム）を用いたが当然、他のゴムでも良く、又、ゴムの厚さは内層が４mm（２〜１０mm）、外層３mm（１〜８mm）とした。
補強繊維はポリエステルコード１２６０ｄ／３本撚りとした。補強コードについてはこの他に、ナイロン６及びナイロン６６、レーヨン等も使用出来、繊維の太さ、密度についても、ゴム配管継手の大きさ、強度に合わせて、選択できるものである。補強繊維層は先に述べたように、軸方向に対し、図９及び図１０のαを５５゜の一定角になるよう交互に２層プライ貼り付けた。
勿論、補強角についても、管の直径や、長さ、膨らみの変化に応じて、所定の性能が得られるよう設定することが可能である。
【００１６】
【発明の効果】
１）異径管を必要とするポンプの出口配管において、配管部品の取付点数が減少することで部品の購入価格低下と取付労務費の低下と取付工事労務費の削減、更に取付高さが低くなるので設備スペースが小さくなる。又バルブは一般に逆止弁の上方に取付け日常頻繁に操作保守点検もするが、その作業高さが低くなるので作業の安全が図れる。
２）振動発生源であるポンプに最も近い位置に異径ゴム配管径手を取り付けることが出来るのでポンプの振動を吸収する上で、その効果が大きいことになる。
３）本発明の異径管タイプのゴム配管継手を用いたとき、許容変位量が２５％〜４０％も大きくとれるようになり、且つ加圧したときも均一な形状を保持することが可能となった。
【図面の簡単な説明】
【図１】図１は本発明の異径ゴム配管継手の片断面図。
【図２】図２は従来の同径ゴム配管継手の片断面図。
【図３】図３は従来の同径ゴム配管継手と異径管を用いたポンプの配管概略図。
【図４】図４は本発明の異径ゴム配管継手を用いたポンプの配管概略図。
【図５】図５は従来の同径ゴム配管継手と同径管ゴム被覆スダレコードの貼り付け形状を示す説明図。
【図６】図６は従来の同径ゴム配管継手と同径管ゴム被覆スダレコードの反対方向から貼り付ける形状を示す説明図。
【図７】図５の貼り付けたスダレ状繊維層の補強角度が、同径のゴム配管径手の各部において、一定であることを示す図。
【図８】図６の貼り付けたスダレ状繊維層の補強角度が同径のゴム配管径手の各部において、一定であることを示す図。
【図９】図９は本発明の異径ゴム配管径手のスダレ状繊維層を用意する形状を示す概略図。
【図１０】図１０は本発明の図９の反対方向から貼り付けるスダレ状繊維層を用意する形状を示す概略図。
【図１１】図１１は本発明の実施例の概略図において、スダレ状繊維層の立体形状を示す図。
【図１２】図１２は図１１のＡ−Ａ矢視断面図。
【図１３】図１３は図１１の反対方向から貼り付けるスダレ状繊維層の立体形状を示す図。
【符号の説明】
１外層ゴム（カバーゴム）
２補強コード（スダレ状繊維層）
３内層ゴム
４固体輪（ソリッドリング）
５フランジ
６逆止弁
７同径ゴム配管継手（フレキ）
８異径管（レジューサー）
９ポンプ
１０異径管ゴム配管継手（フレキ）
１１同径管ゴム被覆スダレコード（従来）
１２異径管ゴム被覆スダレコード（本発明）
１３スダレコード
Ｄ₁ 同径管直径
Ｄ₂ 異径管直径（小）
Ｄ₃ 異径管直径（大）
ｄ貼付け角度
ｈスリット幅
πＤ₁ 同径管周長
πＤ₂ 異径管周長（小）
πＤ₃ 異径管周長（大）
【表１】

[0001]
[Industrial application fields]
The present invention relates to a rubber pipe joint that is attached to the outlet side of a water / hot water pump used for air conditioning of a building and absorbs displacement due to vibration of the pump and installation errors due to construction.
[0002]
[Prior art]
In general, the feed water pump has a large flow rate on the outlet side, and a cast iron or steel different diameter pipe (reducer) is attached immediately above the pump outlet in order to reduce the economic flow rate of the piping (FIG. 3). Most of the metal different diameter pipes differ in size by one size (for example, 150 mm on one side and 200 mm on the other side), have a smooth inner diameter change so that fluid can flow smoothly and pressure loss is reduced, Is provided. The small-diameter side flange is fastened to the pump outlet, and the large-diameter side flange is connected to a subsequent pipe through a rubber pipe joint of the same diameter.
[0003]
[Problems to be solved by the invention]
1) Generally, the discharge side of the pump is in a vertical state and is connected in the order of different diameter pipe, same diameter rubber pipe joint, check valve (and valve) and pipe from the pump outlet, but the limited pipe space (height ) It is very difficult to arrange and assemble all of these parts in the operation, and it is difficult to operate and maintain the valves. For this reason, it is the first subject to reduce the installation space of piping components.
2) Many of these piping parts are generally flanged, but each part has manufacturing tolerances and assembly errors during installation. In addition, thermal expansion and contraction of the piping due to changes in the temperature of the fluid and changes in the outside air temperature occur. Since the pump is supported by a vibration isolator so that the rotational vibration is not transmitted to the floor surface, vibration is also generated between the pump and the pipe. Rubber piping joints are used to absorb all these manufacturing tolerances, assembly errors, thermal expansion and contraction, and pump vibrations. However, it is not possible to use long ones in a limited space. It is difficult to absorb the deflection.
[0004]
[Means for Solving the Problems]
As a result of diligent research to solve the above problems, the present invention has been achieved, that is, focusing on these problems, the different diameter pipes are rigid bodies. It has been devised to solve both of these problems by using a rubber pipe joint having a different diameter such as a diameter pipe. In other words, it is a rubber pipe joint for absorbing pipe displacement that is attached to the outlet side of the water supply pump, with a small diameter on the inlet side of the fluid and a large diameter on the discharge side, and a different diameter in a spherical shape with a bulge between them. The first problem is that the installation height is reduced by the amount of the conventional different-diameter pipe, making it easy to install piping and piping parts. Thus, frequent valve operation and maintenance work can be performed at a low position. In addition, in order to maintain the strength and shape-corresponding strength of the different diameter rubber pipe joints, unreinforced rubber sheets and non-vulcanized rubber-coated reinforcing fiber layers covered with non-vulcanized rubber are alternately applied in different directions. In the different diameter rubber pipe joint obtained by vulcanizing the laminated molded product, the fiber direction of the stale reinforcing layer is different from the axis of the different diameter rubber pipe joint at all the same angle. In addition, a saddle-shaped reinforcing layer covered with unvulcanized rubber is formed into a fan-shaped shape, and each arc portion corresponding to the outer edge and inner edge of the fan is attached to the width of the band-shaped reinforcing layer. Increase the circumference of the large-diameter circumference, decrease the circumference of the small-diameter circumference, and reduce the circumference from the inner arc to the outer arc of the fan. The direction of the fiber layer in a spiral shape to form a certain reinforcement angle Different-diameter rubber with a fixed reinforcing angle of the fiber layer by aligning the reinforcing fiber layers in the angle direction and affixing even number of fan-shaped reinforcing fiber suda records to different diameter pipes by alternately changing the direction of the sled. It is a pipe joint and its manufacturing method.
[0005]
A rubber pipe joint is generally a rubber tubular body reinforced with a fiber layer that is either flange-fixed or loosely held at both ends, and is connected to the middle of the pipe to hold the fluid while expanding, contracting, and twisting the pipe. In order to allow such a displacement, the reinforcing fiber layer is formed by alternately arranging even-ply fiber layers in a slender shape at an inclination angle of 30 to 70 ° with respect to the axis of the rubber tubular body. Since ordinary rubber pipe joints or rubber hoses have the same diameter at both ends, the sled-like fiber layer can be a parallelogram having a constant width.
Accordingly, the angle of the fiber layer after the pasting arrangement with respect to the axis of the rubber tubular body is constant at each part.
[0006]
On the other hand, in the different diameter rubber pipe joint of the present invention, since the diameters are different at both ends, a parallelogram fiber layer having a constant width cannot be bonded.
In order to solve this problem, the sled-like fiber layer is fan-shaped, and the arc portions corresponding to the outer and inner edges of the fan are the circumferences of the large-diameter and small-diameter sides of the different-diameter rubber pipe joint, respectively. It was set to be equal to the length, and from the inner arc to the outer arc, the density was continuously increased, and when it was affixed, a predetermined reinforcing angle was set with respect to the axis of the different diameter rubber tubular body. A reinforcing fiber layer in which the direction of the fiber layer was arranged in a spiral shape was prepared, and the fiber layer was stuck alternately according to the direction of the angle, so that the reinforcing angle of the fiber layer could be made constant.
[0007]
As a result, when the pressure of the fluid is applied, local deformation of the different diameter rubber pipe joint does not occur, and even if expansion, eccentricity or twisting is applied, the entire different diameter rubber pipe joint is displaced. Since it can absorb, it has been possible to provide a different diameter rubber pipe joint that allows a large deflection displacement.
In addition, the diameter gradually changes from the small diameter side to the large diameter side, there is no pressure loss as a different diameter pipe, the conventional different diameter pipe of the rigid body becomes unnecessary, and as a whole, the installation space is reduced and the assembly error is reduced. Since the mounting height is also low, the valve operation and maintenance inspection of the piping can be performed easily.
[0008]
[Action]
By replacing the conventional metal different diameter pipe and same diameter rubber pipe joint with two functions different diameter rubber pipe joint, the built-in height is reduced by the amount of the conventional different diameter pipe, so pipes and pipe parts Thus, the valve operation and maintenance work with high frequency can be performed at a low position. By making the different-diameter pipe itself into a different-diameter rubber pipe joint, there is room in the installation space, and the freedom to design a different-diameter rubber pipe joint that absorbs the various displacements that occur between the pump and the pipe connected to it. The degree is increased, allowing a large deflection displacement, and at the same time, the function of a different diameter pipe is exhibited.
[0009]
The present invention will be described with reference to the drawings. 2 is a cross-sectional view of a conventional rubber pipe joint 7 having the same diameter, and FIG. 3 shows a piping method from the pump. A cast iron or iron different-diameter pipe (reducer) 8 is connected to the discharge port of the pump. A check valve 6 is connected to a pipe in the order of a rubber pipe joint 7 having the same diameter, which is a flexible pipe joint that absorbs expansion, contraction, torsion, and bending displacement.
On the other hand, FIG. 1 is a half sectional view of the different diameter rubber pipe joint 10 of the present invention, and FIG. 4 is an explanatory view showing the piping configuration of the different diameter rubber pipe joint 10 of the present invention. The rubber pipe joint 10 with a different diameter having the function of a different diameter pipe is arranged at the position of the position, and it plays the role of absorbing the deflection displacement and the pump pipe as the different diameter pipe. In the present invention, the metal different-diameter pipe 8 and the same-diameter rubber pipe joint 7 of FIG. 3 are combined into one and formed into the different-diameter rubber pipe joint 10 of the present invention of FIG. Is reduced from 3 to 2, space in the height direction is reduced, and the position of the check valve (or valve) 6 is also lowered.
[0010]
FIG. 5 and FIG. 6 are schematic diagrams for explaining the pasting shape of the Suda record 11 of the conventional same-diameter rubber pipe joint 7 in order to facilitate understanding of the explanation of the pasting angle of the fiber layer of the different diameter pipe of the present invention. In this case, if a constant reinforcement angle is applied to the axis of the rubber tubular body having the same diameter and a parallelogram-shaped suede-like fiber layer having a constant width is attached, any of the axial directions as shown in FIGS. It shows that the same reinforcing angle can be obtained at the position. That is, the Suda record 11 coated with unvulcanized rubber is used as the first ply (3 ply, 5 ply) rubber-coated Suda record of the reinforcing cord having the shape shown in FIG. A rubber-coated sudder record is pasted and vulcanized to form a reinforcing cord 2 so that the sudder record 13 is alternately vulcanized at nearly 70 degrees as a 6th-ply rubber-coated sudder record.
[0011]
FIG. 9 and FIG. 10 are schematic diagrams for explaining the shape of the different diameter pipe rubber-coated suda record 12 to be bonded to the different diameter rubber pipe joint 10 of the present invention. In the different diameter rubber pipe joint, the diameter of the small diameter on the inlet side is shown. Is a D ₂ and the diameter of the large-diameter on the discharge side is different from that of D ₃ , so that the suede-like fiber layer 2 has a fan-like shape as shown in FIGS. 9 and 10 and corresponds to the outer and inner edges of the fan. arc portions, the large-diameter sticking portion of the different diameter pipe rubberized cord fabric 12 is [pi] D _3, small-diameter sticking portion larger diameter D ₃ of different diameter rubber pipe joint as indicated by [pi] D _2, circle diameter D ₂ It is equal to the circumference, and the continuous density is continuously expanded from the inner arc (ab) to the outer arc (cd), and when this is pasted, a constant reinforcement angle with respect to the axis of the different diameter rubber tubular body so as to form the alpha, the tangent angle of each position so that the helical shape a preset beta ₀ ~ It was possible to prepare a fiber reinforced layer in which the direction of the fiber layer was arranged in the same way, and evenly ply the layers evenly in the direction of the angle to make a different diameter rubber pipe joint with a constant reinforcement angle of the fiber layer. .
[0012]
11 and 13 simply represent the shape of the reinforcing cord shown in FIG. 1 in the same manner as in FIGS. 9 and 10. As shown in FIG. 1, the reinforcing cord layer is smooth from a small diameter to a large diameter. It has a curved cross-sectional shape. In this state, the shape is selected so as to be easily deformed with respect to expansion, contraction, eccentricity and torsion in a state where fluid pressure is applied to the different diameter pipe rubber pipe joint. Therefore, the cross-sectional shape is curved and changed from the small diameter to the large diameter. For this reason, the planar shape of the reinforcing cord is the fan-shaped e, f, g, and h in FIGS. 11 and 13, but is curved, and thus has a bulge s as shown in the AA cross section in FIG. Therefore, it is difficult to prepare such a three-dimensional reinforcing cord layer, which causes a cost increase. Therefore, in the present invention, the reinforcing cord layer is provided as shown in FIGS. It is pasted in a shape that can be prepared in a planar shape, and pressure is applied from the inside during vulcanization, so that the cross section of the reinforcing cord layer is expanded so as to have a curved shape.
Therefore, strictly speaking, the reinforcement angle αn with respect to the axis of the different-diameter rubber flexible of the reinforcing cord layer of FIGS. 1, 11 and 13 is not constant at each position. However, in the shapes of FIGS. 11 and FIG. 13, the reinforcing angle may slightly deviate due to the curved shape effect, but this is a practically acceptable range.
[0013]
【Example】
The embodiment will be described with reference to FIG. 1. First, an even-ply reinforcing cord (fiber) layer is alternately pasted around the inner layer rubber (inner rubber) 3 by the method of the present invention. Turned on and fixed to a solid ring (solid ring) 4, an outer layer rubber (cover rubber) 1 is pasted thereon, and an inner diameter and a large diameter of a small diameter flange 150 mm of a metal different diameter pipe prepared in advance at that position The inner diameter of 200 mm is fixed or loosely arranged to have a total length of 200 mm. (See Figure 1)
On the other hand, the rubber pipe joint of the different diameter pipe type of the present invention is mounted as shown in FIG. 4, and the rubber pipe joint has the same diameter as the metal different diameter pipe of 150 mm on the small diameter side and 200 mm on the large diameter side. The performance comparison is shown in Table 1.
[Table 1]

[0014]
Thus, when the different diameter rubber pipe joint of the present invention is used, the allowable displacement can be as large as 25 to 40%, and even when pressurized, the uniform shape is maintained and the mounting height is also reduced. The operability has also been improved.
[0015]
The rubber used was EPDM (ethylene propylene diene rubber) for both the inner and outer layer rubbers, but naturally other rubbers may be used. The thickness of the rubber is 4 mm (2 to 10 mm) for the inner layer and 3 mm (1 to 8 mm) for the outer layer. ).
The reinforcing fiber was a polyester cord 1260d / 3 strands. In addition to this, nylon 6, nylon 66, rayon, etc. can be used for the reinforcing cord, and the thickness and density of the fiber can be selected in accordance with the size and strength of the rubber pipe joint. As described above, the reinforcing fiber layers were alternately laminated with two layers of plies so that α in FIGS. 9 and 10 was a constant angle of 55 ° with respect to the axial direction.
Of course, the reinforcing angle can also be set so as to obtain a predetermined performance according to changes in the diameter, length, and bulge of the tube.
[0016]
【The invention's effect】
1) For pump outlet pipes that require different diameter pipes, the number of pipe parts to be attached is reduced, resulting in lower parts purchase prices, lower installation labor costs, lower installation labor costs, and lower installation height. Therefore, the equipment space is reduced. In general, the valve is mounted above the check valve, and is frequently operated and inspected daily. However, the work height is lowered, so that work safety can be achieved.
2) Since a different diameter rubber pipe diameter can be attached at a position closest to the pump which is a vibration generation source, the effect is great in absorbing the vibration of the pump.
3) When the different diameter pipe type rubber pipe joint of the present invention is used, the allowable displacement can be as large as 25% to 40%, and a uniform shape can be maintained even when pressurized. became.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a different diameter rubber pipe joint of the present invention.
FIG. 2 is a half sectional view of a conventional rubber joint having the same diameter.
[Fig. 3] Fig. 3 is a schematic diagram of piping of a pump using a conventional rubber joint with the same diameter and a different diameter pipe.
FIG. 4 is a schematic piping diagram of a pump using the different diameter rubber pipe joint of the present invention.
FIG. 5 is an explanatory view showing a pasting shape of a conventional rubber joint with the same diameter and a rubber-coated Suda record with the same diameter.
FIG. 6 is an explanatory view showing the shape of the conventional same-diameter rubber pipe joint and the same-diameter pipe rubber-coated suda record attached from opposite directions.
7 is a diagram showing that the reinforcing angle of the attached sled-like fiber layer in FIG. 5 is constant in each part of the rubber pipe having the same diameter. FIG.
FIG. 8 is a diagram showing that the reinforcing angle of the attached fibrous layer of FIG. 6 is constant in each part of the rubber pipe having the same diameter.
FIG. 9 is a schematic view showing a shape for preparing a thin fiber layer of different diameter rubber pipe diameter of the present invention.
FIG. 10 is a schematic diagram showing a shape for preparing a suede-like fiber layer to be attached from the opposite direction of FIG. 9 of the present invention.
FIG. 11 is a schematic diagram of an embodiment of the present invention, and shows a three-dimensional shape of a saddle-like fiber layer.
12 is a cross-sectional view taken along the line AA in FIG. 11;
FIG. 13 is a view showing a three-dimensional shape of a suede-like fiber layer attached from the opposite direction of FIG. 11;
[Explanation of symbols]
1 Outer rubber (cover rubber)
2 Reinforcement cord (sudare fiber layer)
3 Inner rubber layer 4 Solid ring
5 Flange 6 Check valve 7 Same diameter rubber piping joint (flexible)
8 Different diameter pipe (reducer)
9 Pump 10 Different diameter pipe rubber piping joint (flexible)
11 Same diameter pipe rubber coated Suda Record (conventional)
12 Different diameter pipe rubber coated Suda record (present invention)
13 Suda Record D ₁ Same diameter pipe diameter D ₂ Different diameter pipe diameter (small)
D ₃ Different diameter pipe diameter (large)
d Pasting angle h Slit width πD ₁ Same diameter pipe circumference πD ₂ Different diameter pipe circumference (small)
πD ₃ different diameter pipe circumference (large)
[Table 1]

Claims

It is a rubber piping joint for pipe displacement absorption that is attached to the outlet side of the water supply pump, and has a spherical shape with a small diameter on the inlet side of the fluid and a large diameter on the discharge side, and a bulge between them. In non-vulcanized rubber pipe joints obtained by vulcanizing laminated moldings, in which the uncured rubber sheet and the reinforcing fiber layer of the suede weave coated with the unvulcanized rubber are alternately bonded one by one in different sudder directions The different-diameter rubber pipe joint is characterized in that the direction of the fibers in the reinforcing fiber layer in the form of a saddle is arranged at the same angle at all sites with respect to the axis of the different-diameter rubber pipe joint.

In a manufacturing method of spherical different-diameter rubber pipe joints with a small diameter on the fluid inlet side and a large diameter on the discharge side, and a bulge between them, the slender reinforcing layer covered with unvulcanized rubber is fan-shaped Then, each arc portion corresponding to the outer edge and inner edge of the fan has a large width of the large-diameter circumference, and a small-diameter circumference length of the slidable reinforcing layer. Reinforcing fiber in which the direction of the fiber layers is arranged in a spiral shape so as to form a constant reinforcing angle with respect to the axis of the different diameter rubber tubular body by continuously expanding the density of the small, fan-shaped inner arc to the outer arc The fan-shaped reinforcing fiber Suda record is laminated in an angular direction and an even number of fan-shaped reinforcing fiber Suda records are attached to different diameter pipes alternately in different Sdale directions and vulcanized to make the reinforcing angle of the fiber layer constant. Diameter rubber pipe joint manufacturing method.