JPH026393B2 - - Google Patents
Info
- Publication number
- JPH026393B2 JPH026393B2 JP11280982A JP11280982A JPH026393B2 JP H026393 B2 JPH026393 B2 JP H026393B2 JP 11280982 A JP11280982 A JP 11280982A JP 11280982 A JP11280982 A JP 11280982A JP H026393 B2 JPH026393 B2 JP H026393B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- nut
- rear end
- joint body
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 claims description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Joints With Pressure Members (AREA)
Description
【発明の詳細な説明】
この発明は、管継手とくに圧縮型の管継手に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe joint, particularly a compression type pipe joint.
この種の管継手としては、特公昭40−7625号公
報に開示されているように、後端部の外面に雄ね
じ部を有しかつ後端内面に前細り状のテーパ部を
設けた筒状の継手本体と、継手本体の雄ねじ部に
ねじ合いかつ後端に内鍔を有するナツトと、ナツ
ト内に配されかつ外面に前細り状のテーパ部を有
するとともに後端中央に球状凹部を有する前側ス
リーブと、前側スリーブの後に配されかつ前端に
前側スリーブの凹部にはまり込む球状凸部を有す
る後端スリーブとからなるものが一般的であつ
た。この管継手では、継手本体に対してナツトを
締付けていくと、まず後側スリーブがナツトによ
つて後から押されて前側スリーブに当たり、つぎ
に後側スリーブと前側スリーブとが一体になつて
前進し、前側スリーブが継手本体に当たる。する
と、前側スリーブの球状凹部の半径より後側スリ
ーブの球状凸部の半径の方がわずかに小さいこと
と、後側スリーブの後面とナツトの内鍔前側面と
が軸心向きに開いた角度関係を有していることに
より、この角度関係が零になるまで、後側スリー
ブは前部にて小径に後部にて大径になるように変
形し、後側スリーブの前端縁が管に喰込んで、管
と後側スリーブの間に楔作用が生じるようになさ
れていた。しかし従来、後側スリーブは、ステン
レス鋼、炭素鋼、銅合金等の金属で構成されてい
たため、上記変形はごくわずかなものに限定さ
れ、したがつて管への前端縁の喰込み量もわずか
なものとなり、上述した楔作用も強固なものとす
ることができなかつた。 As disclosed in Japanese Patent Publication No. 40-7625, this type of pipe joint has a cylindrical shape with a male thread on the outer surface of the rear end and a tapered part on the inner surface of the rear end. a joint body, a nut that is threaded into the male threaded part of the joint body and has an inner flange at the rear end, and a front side disposed within the nut and having a tapered part on the outer surface and a spherical recess at the center of the rear end. It has generally consisted of a sleeve and a rear end sleeve disposed behind the front sleeve and having a spherical protrusion at the front end that fits into a recess in the front sleeve. In this pipe fitting, when the nut is tightened against the fitting body, the rear sleeve is first pushed from behind by the nut and hits the front sleeve, and then the rear sleeve and front sleeve move forward together. Then, the front sleeve hits the joint body. Then, the radius of the spherical convex part of the rear sleeve is slightly smaller than the radius of the spherical concave part of the front sleeve, and the angular relationship between the rear surface of the rear sleeve and the front surface of the inner flange of the nut opens toward the axis. , the rear sleeve deforms so that it has a small diameter at the front and a large diameter at the rear until this angular relationship becomes zero, and the front edge of the rear sleeve bites into the tube. A wedge action was created between the tube and the rear sleeve. However, conventionally, the rear sleeve was made of metal such as stainless steel, carbon steel, or copper alloy, so the deformation described above was limited to a very small amount, and the amount of bite of the front edge into the tube was also small. As a result, the wedge action described above could not be made strong.
この発明は、上記のような点に鑑みてなされた
もので、管をスリーブで強く締付けて常に確実な
シール性を保持することのできる管継手を提供す
ることを目的とする。 This invention was made in view of the above-mentioned points, and an object of the present invention is to provide a pipe joint that can firmly tighten a pipe with a sleeve and always maintain reliable sealing performance.
以下、この発明を図示の実施例により具体的に
説明する。なお、この明細書において、前後関係
は第１図を基準とし、同図の左方を前方と称し、
右方を後方と称することとする。 Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments. In this specification, the context is based on FIG. 1, and the left side of the figure is referred to as the front.
The right side will be referred to as the rear.
第１図において、１はこの発明による管継手の
継手本体で、これの前後両端部の外面には前側雄
ねじ部２および後側雄ねじ部３が設けられ、さら
に後端内面には前細り状のテーパ部４が設けられ
ている。５は継手本体１の後側に配された袋ナツ
トで、後端に内鍔６を有し、これの中央孔が管挿
通孔７となされている。そしてナツト５は、これ
の雌ねじ部８が継手本体１の後側雄ねじ部３にね
じ合されることにより、継手本体１の後端部に取
付けられている。９，１０はナツト５の内側にそ
れぞれ配された前側スリーブおよび後側スリーブ
で、これらはいずれも靭性セラミツクスで製作さ
れている。靭性セラミツクスは、ジルコニア等を
含むセラミツクスよりなり、一定の靭性域を有す
る。この実施例では前後スリーブ９，１０がとも
に靭性セラミツクス製であるが、後側スリーブ１
０のみが同材で構成されていてもよい。前側スリ
ーブ９の外面には継手本体１のテーパ部４に合致
する傾斜角度の前細り状のテーパ部１１が設けら
れ、また同スリーブ９の後端中央には前細りテー
パ状の凹部１２が形成されている。後側スリーブ
１０の前端には前側スリーブ９の凹部１２にはま
り込みかつこれのテーパに合致する傾斜角度の前
細りテーパ状の凸部１３が設けられている。 In Fig. 1, reference numeral 1 denotes a joint body of a pipe joint according to the present invention, which has a front male threaded part 2 and a rear male threaded part 3 on the outer surface of both its front and rear ends, and a tapered part on the inner surface of the rear end. A tapered portion 4 is provided. Reference numeral 5 designates a cap nut disposed on the rear side of the joint body 1, which has an inner flange 6 at its rear end, and a central hole thereof serving as a tube insertion hole 7. The nut 5 is attached to the rear end portion of the joint body 1 by screwing the female threaded portion 8 of the nut 5 to the rear male thread portion 3 of the joint body 1. Reference numerals 9 and 10 denote a front sleeve and a rear sleeve respectively arranged inside the nut 5, both of which are made of tough ceramics. Tough ceramics are made of ceramics containing zirconia and the like, and have a certain toughness range. In this embodiment, both the front and rear sleeves 9 and 10 are made of tough ceramics, but the rear sleeve 1
Only 0 may be made of the same material. The front sleeve 9 is provided with a tapered part 11 on the outer surface thereof at an inclination angle that matches the taper part 4 of the joint body 1, and a concave part 12 is formed at the center of the rear end of the sleeve 9. has been done. The front end of the rear sleeve 10 is provided with a tapered protrusion 13 that fits into the recess 12 of the front sleeve 9 and has an inclination angle that matches the taper of the recess 12 .
つぎにこの発明の管継手による管の接続操作に
ついて説明する。 Next, the operation of connecting pipes using the pipe joint of the present invention will be explained.
まず、管Ｐの接続すべき端部をナツト５の管挿
通孔７に通して、継手本体１の環状内方突出部１
４の後側面に当たるまで、継手本体１内に挿入す
る。この段階では、継手本体１、前後スリーブ
９，１０およびナツト５の相互間には遊びがあ
る。つぎにこの状態からナツト５を締めると、ナ
ツト５の内鍔６が後側スリーブ１０に当たり、こ
れを前進せしめる。すると、後側スリーブ１０の
凸部１３が前側スリーブ９の凹部１２内にはまり
込み、前側スリーブ９を後側スリーブ１０ととも
に前進せしめ、前側スリーブ９の先端が継手本体
１のテーパ部４に当たる。さらにナツト５を締め
ると、靭性セラミツクスよりなる前後スリーブ
９，１０の各前端縁が内方に絞られて、それぞれ
管Ｐに喰込み、管Ｐが強く締付けられる。 First, the end of the pipe P to be connected is passed through the pipe insertion hole 7 of the nut 5, and the annular inward protrusion 1 of the joint body 1 is inserted.
4 into the joint body 1 until it hits the rear side. At this stage, there is play between the joint body 1, the front and rear sleeves 9, 10, and the nut 5. Next, when the nut 5 is tightened from this state, the inner flange 6 of the nut 5 hits the rear sleeve 10, causing it to move forward. Then, the convex portion 13 of the rear sleeve 10 fits into the recess 12 of the front sleeve 9, causing the front sleeve 9 to move forward together with the rear sleeve 10, and the tip of the front sleeve 9 hits the tapered portion 4 of the joint body 1. When the nut 5 is further tightened, the front edges of the front and rear sleeves 9, 10 made of tough ceramics are squeezed inward and bit into the pipe P, thereby strongly tightening the pipe P.
第２図、第３図はこの発明の変形例を示すもの
で、この例では後側スリーブ１０の凸部１３は球
面を有している。また後側スリーブ１０の後端面
１５は、軸方向に対して直角をなしており、ナツ
ト５の内鍔６は急な前広がりテーパ状の前側面１
６を有している。そのため後端面１５と前側面１
６の間には軸心向きに開いた小角度ａが形成され
ている。この場合、前側スリーブ９が継手本体１
のテーパ部４に当たつた後、さらにナツト５を締
めると、第３図に示すように、球状凸部１３がテ
ーパ状凹部１２に沿つて滑つて内方に絞られ、後
側スリーブ１０の前端縁がＰの外面に鋭く喰込
む。さらにナツト５を締めると、後側スリーブ１
０は、垂直状後端面１５とテーパ状前側面１６と
のなす小角度ａが零になるまで、前端から後端に
かけて徐々に外方に拡げられる。すると、後側ス
リーブ１０は、管Ｐに喰込んだ前端縁を支点とし
て、前側スリーブ９をいつそう前方に押しやる。
そのため前側スリーブ９の先端部が継手本体１の
テーパ部４と管Ｐとの間に強固な楔作用を生じ
る。 2 and 3 show a modification of the invention, in which the convex portion 13 of the rear sleeve 10 has a spherical surface. The rear end surface 15 of the rear sleeve 10 is perpendicular to the axial direction, and the inner flange 6 of the nut 5 has a tapered front surface 1 that widens rapidly.
6. Therefore, the rear end surface 15 and the front surface 1
6, a small angle a is formed in the axial direction. In this case, the front sleeve 9 is connected to the joint body 1.
When the nut 5 is further tightened after hitting the tapered part 4 of the rear sleeve 10, the spherical convex part 13 slides along the tapered concave part 12 and is squeezed inward, as shown in FIG. The front edge cuts sharply into the outer surface of P. When nut 5 is further tightened, rear sleeve 1
0 gradually expands outward from the front end to the rear end until the small angle a formed between the vertical rear end surface 15 and the tapered front surface 16 becomes zero. Then, the rear sleeve 10 pushes the front sleeve 9 forward, using the front edge bited into the pipe P as a fulcrum.
Therefore, the tip of the front sleeve 9 creates a strong wedge action between the tapered portion 4 of the joint body 1 and the pipe P.
この発明による管継手は、以上のとおりで前後
一対のスリーブ９，１０のうち少なくとも後側ス
リーブ１０が靭性セラミツクスよりなることを特
徴とするものであるので、スリーブの靭性変形に
よつて管を強く締付けて強固な楔作用を生じさせ
ることができ、その結果管の脱抜を確実に阻止し
て完全なシール性を保持することができる。また
靭性セラミツクスよりなるスリーブは耐食性、耐
熱性および硬度の点でも申し分ない上に、熱膨張
率が金属より小さいため、鋼管に高温流体を通す
場合には、締付け効果をいつそう増大することが
できる。 As described above, the pipe joint according to the present invention is characterized in that at least the rear sleeve 10 of the pair of front and rear sleeves 9 and 10 is made of tough ceramics, so that the pipe can be strengthened by the toughness deformation of the sleeve. It can be tightened to create a strong wedge action, and as a result, the tube can be reliably prevented from coming off and a perfect seal can be maintained. In addition, sleeves made of tough ceramics have excellent corrosion resistance, heat resistance, and hardness, and have a lower coefficient of thermal expansion than metals, so they can greatly increase the clamping effect when passing high-temperature fluids through steel pipes. .
図面はこの発明の実施例を示すもので、第１図
は管継手の縦断面図、第２図は、第３図変形例を
示す管継手の要部縦断面図である。
１……継手本体、３……雄ねじ部、４……テー
パ部、５……ナツト、６……内鍔、７……管挿通
孔、８……雌ねじ部、９……前側スリーブ、１０
……後側スリーブ、１１……テーパ部、１２……
凹部、１３……凸部。
The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a pipe joint, and FIG. 2 is a longitudinal cross-sectional view of a main part of the pipe joint showing a modification of FIG. 3. 1... Joint body, 3... Male threaded part, 4... Tapered part, 5... Nut, 6... Inner flange, 7... Tube insertion hole, 8... Female threaded part, 9... Front sleeve, 10
... Rear sleeve, 11 ... Tapered part, 12 ...
Concave portion, 13...Convex portion.
Claims (1)
かつ後端内面に前細り状のテーパ部４を設けた筒
状の継手本体１と、継手本体１の雄ねじ部３にね
じ合いかつ後端に内鍔６を有するナツト５と、ナ
ツト５内に配されかつ外面に前細り状のテーパ部
１１を有するとともに後端中央に凹部１２を有す
る前側スリーブ９と、前側スリーブ９の後に配さ
れかつ前端に前側スリーブ９の凹部１２にはまり
込む凸部１３を有する後側スリーブ１０とからな
る管継手において、前後一対のスリーブ９，１０
のうち少なくとも後側スリーブ１０が靭性セラミ
ツクスよりなることを特徴とする、管継手。 ２ 靭性セラミツクスが、ジルコニアを含有した
セラミツクスよりなる、特許請求の範囲第１項記
載の管継手。 ３ 後側スリーブ１０の凸部１３が球面を有す
る、特許請求の範囲第１項記載の管継手。[Claims] 1. A cylindrical joint body 1 having a male threaded portion 3 on the outer surface of at least the rear end and a tapered portion 4 on the inner surface of the rear end, and a male threaded portion 3 of the joint body 1. A nut 5 that is threaded into the nut 5 and has an inner flange 6 at the rear end; a front sleeve 9 disposed within the nut 5 and having a tapered portion 11 on the outer surface and a recess 12 at the center of the rear end; 9 and a rear sleeve 10 having a protrusion 13 at the front end that fits into the recess 12 of the front sleeve 9, the pair of front and rear sleeves 9, 10
A pipe joint characterized in that at least the rear sleeve 10 is made of tough ceramics. 2. The pipe joint according to claim 1, wherein the tough ceramic is made of ceramic containing zirconia. 3. The pipe joint according to claim 1, wherein the convex portion 13 of the rear sleeve 10 has a spherical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11280982A JPS596488A (en) | 1982-06-29 | 1982-06-29 | Pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11280982A JPS596488A (en) | 1982-06-29 | 1982-06-29 | Pipe joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS596488A JPS596488A (en) | 1984-01-13 |
| JPH026393B2 true JPH026393B2 (en) | 1990-02-08 |
Family
ID=14596068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11280982A Granted JPS596488A (en) | 1982-06-29 | 1982-06-29 | Pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS596488A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060237962A1 (en) * | 2005-04-22 | 2006-10-26 | Anderson Bret M | Tool for preparing fitting and conduit connection |
| JP2009068565A (en) * | 2007-09-11 | 2009-04-02 | Daikin Ind Ltd | Biting-in type pipe fitting and refrigeration system |
-
1982
- 1982-06-29 JP JP11280982A patent/JPS596488A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS596488A (en) | 1984-01-13 |
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