LT3090B - Plug-sealing element for pipe elements joint - Google Patents

Abstract

A locked seal with an axially compressed gasket (8), includes a mating seal flange (9) for axially compressing the gasket (8), and a mating lock flange (12) for urging the locking ring (18) against the flat end (1), said ring (18) being provided with an elastomeric front portion (25) for engaging the back of the mating seal flange (9). The joint may be used in a pipe made of ductile cast iron.

Description

The present invention relates to pipe connection equipment,. namely './ with' a flap seal connecting the smooth end of the first tubular member and the sleeve of the second tubular member. The seal consists of 5 ·: axial compression gasket in / nipple; // + / clamping ring with serrated teeth; 'comprising a smooth end and from a coupling device having / is </ _; , + te-clamping means and / / / adapted to form longitudinal compression of the gland + / + 7 // and / +; ūž + flap ring for reverse. to prevent scrolling // This // //,. coupling / / device consists of two clips: / / ^ sealing ⁷ clamps for / axial / gland + Z /./ / compression. / end. It is particularly applicable to pipe systems made of forged /: .kett. "///. , · '// //. /'//'/++-//.,+//.+ / document EP-A-334 ^380/7 described užsklendžiamasis / - '//// seal with a larger connecting device is / are / is the only clamp 20 + , for / and for compression of the gland axial compression and / for the shutter ring / for its narrow end,?;, / {smooth} / · end of the pipe. + snag + imo +: / during / decreases' ++ / + tightness s. , A decrease in tightness, + occurs in the following cases: /.

'.25 /'/'/+.// / +' · + '''.////+'//;//+'·, ⁷ ''./.,+,</,// . + /: /

a) / During installation: / .the clamping ring / spigot · covers the smooth end of the tube ⁷ when pushed by a clip. The latter must creep / along the axis of the tube; / to compress the gland / Due to this compression; during the gi / trau + kia + with / the smooth end of the tube / then + the tightness + quality depends on having a sufficient / initial axial clearance between the smooth end of the tube and the nipple. bottom: the smooth end then rests on the nipple / bottom, the clamp cannot slip And this results in insufficient compression of the gland: the latter cannot then perform the sealing function as required.

. LT 3090 B

77 / + '/. / '/ 7 + 7' '/ + b); ./ During operation r Do not disassemble the shut-off system or perform another shut-off without damaging the seal.

- (c) Also during operation, under the internal pressure of the fluid flowing in the tube, the smooth end tends to slide along the tube axis clamp and reduce the compression of the gland, which is, of course, 'causes a loss of tightness.

SUMMARY OF THE INVENTION The object of the invention is to partially or completely eliminate the drawbacks listed above and, in the second case, to prevent sealing during locking.

Therefore, the present invention relates to a locking seal of the aforementioned type, characterized in that the locking ring has an elastomeric protrusion on the back wall of the sealing clip.

²⁰ '

By other characteristics;

- the sealing clamp comprises axial coupling elements, whereas the clamping clamp comprises axial coupling elements;

- the clamps have independent means for axial connection to the nipple;

- the means for connecting each clamp move freely to the other clamp;

- all connecting elements are located radially from the nipple side to the peripheral flange of the sealing clip;

: - ³ '? 7 ..//--/ 7. "// '/ each /./ clips. connection. elementBtaB.

/ - - arranged // -radially of. .cuff side on

- / peripheral flange sector rigidly connected to B /.// -this clip;

-5> - / '; , BB BB - B -B // B'-Z'B.? '· - ^; 'b)'^¥;</ 7j)) / zB ^7L /;) /); Z'B

B. · /. · /:-'../ '''') · 'are provided with space selection means that 7 /// · /' are received _; flats / select the smallest gap between the two

-closures when sealer is assembled;

-Spreading tools include a limit on the screw length of the locking / ..//..//connecting threaded connection elements ..

Hereinafter, examples of embodiments of the invention will be described with reference to the accompanying drawings, in which:

·· BB B., ·. ·. · '. BB; '·'/'.B'·'·:pB,; ./ .. B -B B. - '''7 ^: '. · B'- · B 'BBB'

FIG. 1 is a fragmentary longitudinal sectional view of a latch seal according to the invention, taken in a diameter plane (line I 20 I Fig. 3) passing through a latch fastener coupling member; '

FIG. Fig. 2 shows an analogous partial view of the same seal taken in a plane of diameter (line II - II in Fig. 3) passing through a sealing clip connecting member;

i- ⁱ B ': BFigB .// 3 _; '/.' is a partial sectional view of the clamping clip taken in FIG. 1 and FIG. 2 arrows

III direction;

FIG. 4 and FIG. 5 represents images corresponding to /'')./'.//:Fig.·· 1 and ZFigi 2. and are associated with a second embodiment of the latch seal of the present invention.

735 ^; // - 7) / tealizavimut

FIG. 6 is a partial view of the end of the latch clamp taken in the direction shown in FIG. 4 or FIG. Index 5 VI;

- FIG. Ί is a view of the quadrant of the tip of the solids taken in the direction shown in FIG. 4 or • Figs. Index 5 'VII; '

- FIG. 8 is a view analogous to FIG. 4 corresponding to a sealing variant detailed in Figures 4, 5, 6, and 7;

- FIG. 9 and Fig. 10 are analogous to Figs. 1 and FIG. 2 views taken along the lines of Figs. 11 lines ΙΧ-ΊΧ and Χ-Χ, respectively, associated with a third embodiment of the latch seal of the present invention?

- FIG. 11 is a partial view of the sealing end taken in FIG. 9 or FIG. 10 in the direction of arrow XI.

FIG. 1 ... 2 and. Fig. 3 shows a locking seal connecting the smooth end 1 of the first tubular member and the nozzle 2 of the second tubular member. The tubular members may be two identical tubes of any type of drainage system, in particular ductile iron, each tube may be smooth or narrower), and ant-ras is a nipple. For the purposes of this description, it will be assumed that, as shown in the drawings, both tubular members have a common horizontal axis.

The outer surface of the smooth end 1 is cylindrical, whereas the outside of the nipple 2, starting from its entrance, is formed by an annular flange 3 passing to a sloping surface 4. The inside of the nipple consists of a cut cone

'5 of the entrance surface 5, over which / is carved 6, _:: .., / (.//- ending / almost radial / radial /. ///; wall 7. / 777.///' (The binder, /. Consists of an axial compression gasket 8, (7 sealing clamp 9 with clamping / clamping 'details 10, clamping devices. 11 and / clamping /, clamp / 127' axial 'compression gland''we understand // //,7/(//.boltbosids' bushing type gland, which is mechanically .'10 Compressed along the axis.

^;; // (/ ą ( ^: I /// Gasket 8 is made of elastomer. When it is applied to the end of the fitting tube and loosely rested on the sleeve; ../://Wall '7, there must be free space between the gasket 715 - V outer / (peripheral) surface and notches 6.

Sealing clip 9 formed; of a continuous inner ring 13 // oriented <approximately along the axis, // {/ • '' {loosely /; comprising / (inserting '// pipe end 1 and

720 in / out groove 6 to press gland 8 against radial wall 7 / Depth of this gland is critical to provide / guarantee the desired tightness · • / 7 - / - //. -, - - // /. . '// - ^ / 7- / (-.-.//-/7./7/7/7(/7/?////M7/

From the rear edge of the ring 13 / (Fig. 1 and Fig. 2 // // to the right) extends outward / a continuous radial curtain 14 having six threaded holes 15 (Fig.1) at the level of the annular ring 3, spaced evenly on the same // (/ 7- circle. //

73Θ / / / '/: {-' (..7 .///- ^; -7 7 // 7 fe curtain 14 edge forward '.7,7 /// -: /in./peripheral flap i 6 ., / 'ring 3-and / having three almost half-cylinders open inwards

The cutout 17 is arranged at regular angles / 35 - - / yes-holes 15/7 <Fig7 / l / (and Fig. 2). There is a hole 14A in front of each notch 17 in the curtain 14.

V.

·· β

The latching device 11 is a component obtained by the lapping process. It consists of a series of metallic inserts which form a clamping ring in an elastomeric ring 19. The inserts 18 could be replaced by a cut continuous ring, but the combination of many inserts is preferred because it is better suited for various pipe configurations.

Each insert 18 is made up of a curved trapezoidal 10 * section with a large front radial plane and a small posterior radial plane with an outer radial surface. 20 converging to the posterior plane, preferably in the form of a static surface, and having an inner radial surface, generally a cylindrical or planar shape, formed by a series of teeth 21 which may engage at the end of the smooth tube.

The ring 19. Consists of a front cylindrical part 22 having a serrated inside and a rear cylindrical part.

part 23, the interior of which may also be serrated. These two portions are connected by a sheath 24 covering the outer surface of the inclusions 20. * / ARRRRRbRAbRRRRbRRR ^ A ^ / bAAbAA '-R' rB: b _; bAb. · 'A AR A? -. R <../: '·' -RR AR · .. · .R; RR. · A ..R ^; R, 'A · R · -? R \

The front portion 22 terminates with a front protrusion 25 forming a support lip resting on the flap of clamp 9 14. By being elastic, this protrusion .25 prevents the clamping clamp from sliding. This avoids changing the sealing parameters by changing the locking parameters. The ring 19 encloses the inserts 18 on all sides, except for the serrated inner part.

The locking clip 12 is comprised of a flat and radial cover 26 having six smooth holes 27 slightly larger than the diameter of the threaded holes 15. Curtain 26 has three more, ··. · '·. , / 77 / 7-. / 77 regularly arranged sleek holes 28 with a significantly larger diameter (Fig. 3). The peripheral radial portion of the shroud 26 is joined to the compressive portion of a nearly cut cone '29. converging to the posterior portion. The inner surface of this portion nearly corresponds to the outer surface 20 of the inclusions 18.

When the nipple is your own. instead, the seal 10 described is mounted as follows.

The parts 12, 11, .9, and 8 are successively pressed against the smooth end of the tube, which are substantially disposed relative to the end of the tube. The sleeve 8 and the latch 11 are easily pressed against the smooth end.

Finally, the sleek end slides into the nipple. Then push the gland 8 until it leans against the nipple wall 7. 7 ·

2.0

Clamp 9 to. the front shall be pushed so that its front plane rests against the back plane of the seal.

Finally, three screws 10 (Fig. 1 not shown) 25 bolts 31 ». having eccentric noses 30 at their front ends, inserted at their respective ends into holes 14A. The .screw 8 is then pressed into the front by turning the nuts 31A on each of the screws 31, their nuts 30 resting on the nipple ring.

3 and for nuts to. the posterior plane of the latch clamp. This pressure is transmitted by the ring 13 in the direction of the axis of the tube to the gasket 8 .. and thus guarantees the tightness of the seal. As can be seen from Figs. 2 »radial position of nose 30, preferably .a in alignment. two lateral recesses 32 for each nose and the end planes 33 for notches. '2 the plane of incision is moved at this point to show; this interaction (see also Fig. 7).

Whatever the radial clearance between the end of the insertion tube 5 and the nipple, and whatever the angular position of the end of the insertion tube relative to the axis of the nipple, adjusting the screw 31 to obtain the desired tightness in the seal.

The locking device 11 is then pushed forward until its part 25. leaning on clamp 9. This is easy to do since this device is not -related to radial compression. The locking clip 12 'is then pushed in until the inner slant 15-' touches the sheath 24. In doing so, the nuts 31A easily pass through the three holes 28 (Fig. 2).

Finally, the six locking screws 34 (Fig. 1} are pushed from the rear to the front through the hole 27 through which they easily pass, and * are screwed into the holes 15. By rotating these screws, we compress radially

S ·, «· '> f inserts 18 on a smooth tube, at that. by sealing the seal.

It can be seen that sealing in no way changes the position of the sealing clamp 9, nor does the sealing parameter, which is determined solely by the sealing clamp, whereas the clamping parameters depend only on the clamping clamp 12.Also, 34 without compromising the tightness.

However, during operation, the back thrust that occurs in the fluid; when the pipe 7 is flowing, the clamp 12 may be slightly pushed through the inserts 18, in which case the clamp 12 will also cause it to slide back, and / or the clamp 9. This will release the seal. /; / This hazard is avoided by the use of the / / sealant variant shown in Figs. '4-7. .from ./ described by him. only by clamping: clamping the hook? .

.10

In fact, in this / variant: the holes 27 are on the same circular # © / · as / and the holes 28 »(Fig. 6j:, /: and / the holes / 15 are glothids. The screws 34 are replaced with / screws 34A, analogous to screws 31> / longer, connected to the nuts 34B, which are preferably the same as the nuts 31A Accordingly, the R-flange of the clamp is nine notches 17 (Fig. 7) -.

Thus, when the seal is mounted, after the sealing means 10 are sealed as in the embodiment described (Fig. 5 is identical to Fig. 2), the locking device 11 is first placed, then -. clamp 12, which is secured behind the nipple ·, by the 3 screws 34A - 34B of the ring: the front of the screws 34A is inserted through holes 15 and 27 and the nuts 34B are screwed onto these screws. They rest on the back wall (26) of the flap 26 of the clip 12 (Fig. 4).

Thus, FIG. 4-7, this ensures that the possible displacement of the clamping clamp '12 does not alter the compression of the gland and thus the sealing of the seal.

It should be noted that this combination has a disadvantage. Attempting to achieve a state of engagement of the clips 12 and 9 may result in excessive compression, at least local, of the seal 8.

To avoid this drawback, Figs. In variant 8, the threads of the long screws 34A and the nuts 34B are: limited so that, when the nuts are fully tightened, the clamp 12 is at a distance: at least level to the size of clamp 9, including the outermost position to secure the seal.

To the same end Fig *. In an embodiment of the invention shown in Figures 1-3, it is possible to limit the thread length of the screws 34.

FIG. 9 to 11 differ from that shown in FIGS. 4-7 or Figs. 8 •• Y; : · \: Γ33 / 3 ' ^: 4Υ333: 3 / · /'27'33 ^? - · '33 ·· 3γ.ΥΥ ^|, Υ333Ϊ! - ·· 33 '/' 3373 // · 333- ^; 7'3 / '' // ^{γ,, /;} γ ^Λ: '333 ^, 7-33-333 / 7Y31 · /' · 7. '''' 7 //Υ-Y./-3333 <'· -. ^; 7; .γ ^: · -.3 - // 35 /'.,/ 'only two-clamp outer radial · structure.

In fact, the peripheral outer diameter of the sealing-clamp 9 is approximately equal to the diameter of the ring 3! (Fig. 9} with the exception of the three .tightening details. · 10 mounting points formed by the radial projections' 9A with bore holes 14Ά (Figs. 10 and Fig. 11). Each projection 9A has a sector of the peripheral flange 16A facing forward and a U-shaped portion of the tip 17A which is open inwardly for radial holding of the short clamping member 1.0.

Also, the clamping clamp 26 is of an outer diameter (smaller than the smallest) to the diameter determined by the nuts 31Δ when in place (Fig. 10) but between. these nuts are .three radial projections 26A with two holes 27 (Figs. 1 and 11). * Each projection 26A holds the peripheral 'flange 16B sector approximately the same diameter as the sectors 16A facing forward' and has an I7B at its extremity. U-shaped part, open inwards, for radial holding of two long screws 34A.

This embodiment ensures complete independence of both clips and, of course, allows the use of only one of the two clips. Thus, only the clamp 9 can be used to realize the non-locking seal of the gland axial compression and only the clamp 12 can be used to lock the seal with the automatic gland, i. y, the radially compressed gland when acting on the insertion tube inserted into the nipple.

In each embodiment of the invention, depending on the nominal diameter of the tubular members and the nominal pressure of the fluid transmitted therewith, a certain screw or number of clamping members is selected for each clamp.

Claims (8)

DEFINITION OF INVENTION 1. A tubular element joint sealing seal for connecting a first tubular element The 5 'smooth end (1) and the nozzle (2) _{t of the} second tubular member are formed. an axial compression sealing ring (S)., a locking ring (18) with internal teeth (21) extending on the smooth end of the tube and a clamping device. (9, 12) having a hook behind 10 nipple means (10, 34, 34A, 34B) adapted to form axial compression of the gland (-8) and to prevent back-slip of the latching ring, this clamping device «comprising two clips, i. of sealing clamp (9) for gasket (8) 15th for axial compression, and from the latch clamp (12),> / • for clamping the latch ring (18) on the end of the sleeve tube (.1), characterized in that the latch ring (18) has an elbow (2.5) from the elas'tomer designed to rest on the sealing clips 20 (9) rear wall. Locking seal according to Claim 1, characterized in that the sealing clamp (9) comprises axial 'clamping elements (10) while the clamping clamp (12)' has an axial clamping. behind the elements (34) of the sealing clamp (9). Užsklendžiamasis third seal according to claim 1, in addition to give the _B si ntis in that the clip (9, 12) are independent of the axial slinging the sleeve (2) the elements (10, 34A, 343}. · The self-sealing seal according to claim 3, b, being split / i = š ^; // _r in / to / of each strap (9, 12) the hook elements (10, 34A, 343) • freely through another / sąyaržąi //.= / T:) / 7./-)...// )) .-.)? '- 7 y /. ·. /. ) 13) / '- /.) -. 5. Closure seal according to Claims 3 and 4, characterized in that the clamping elements (10, 34A, 34B) are radially arranged on the side of the nipple (2) by means of a sealing clamp (9). 5 peripheral flange. 6. Sealing seal according to claims 3 and 4, characterized in that the clamping elements (10, 34A, 34B) of each clamp (9, 12) are made of a sleeve. The sides of the 10 (2) are radially arranged using a peripheral flange sector (16A, 16B) rigidly connected to this clamp. A latch seal according to any one of 1-6 15, characterized in that it provides means for maintaining a minimum gap (d) between the two clips (9, 12) when the seal is mounted. Self-locking seal according to claim 7, characterized in. 20 in that said gap support means utilizes a limit on the screw length of the threaded engaging elements (34, 34A, 34B) of the locking clip (12).