DE1269849B - Ring-sealed socket connection for pipes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Number:
File number:
Registration date:
Display day:

F161

German KL: 47 f- 8/04

P 12 69 849.6-12
June 2, 1964
June 6, 1968

The invention relates to a ring-sealed socket connection for pipes with a circumferential spacing holding members firmly attached to each other, in the installed state in a wide annular groove of the socket end under pressure by radial compressive forces arranged wide sealing ring, the with an end face on the inner wall surface of an outwardly delimiting the annular groove, the insertion end with little play comprehensive retaining collar of the socket end and with the inner and outer peripheral surface of its sealing part under pressure sealingly to the substantially cylindrical outer surface of the insertion end and the opposite bottom surface of the annular groove.

In known socket connections of this type, the spigot end is against any separation the connection in the socket end secured by holding members, which are located with their radially inner Dig the edges into the pipe wall of the plug-in end from the outside. To do this, the Holding members between the spigot end and the sleeve exert a wedge effect in which the in the sense the longitudinal force acting on the separation of the connection is a multiple magnified and extraordinary harmful squeezing force exerts on the spigot end and high hoop tensile stresses occur in the socket. To exert the wedge effect, the retaining links in the socket connection must be arranged in this way be that the direction of force of the wedge force at an angle of 45 ° or more to the longitudinal axis of the pipes runs. Even with a socket connection of this type, which is still known, in which one with a circumferential distance Sealing ring that is firmly attached to each other and is provided with a line-pressurized sealing ring Lip seal is formed and in which the holding members are located on one in the circumferential direction extending shoulder arranged at an axial distance from the free end edge of the insertion end support, the holding members exert a considerable squeezing force on the insertion end, since they are unhindered can perform a tilting movement through the material of the sealing ring.

In contrast, a socket connection is to be formed by the invention so that when it occurs a tensile force in the socket connection causes a tilting movement of the holding members around their inner ones Ends and thus a harmful squeezing force can be avoided. This is accomplished according to the invention achieved that with a known arrangement of a circumferential shoulder in the axial distance from the free end edge of the push-in ring-sealed socket connection for pipes

Applicant:

United States Pipe and Foundry Company,

Birmingham, Ala. (V. St. A.)

Representative:

Dipl.-Ing. W. Paap,

Dipl.-Ing. H. Mitscherlich

and Dipl.-Ing. K. Gunschmann, patent attorneys,

8000 Munich 22, Steinsdorfstr. 10

Named as inventor:
Carl Arthur Henrikson,
Robert Malcolm Graham,
Charles Clayton Pierce,
Birmingham, Ala. (V. St. A.)

Claimed priority:

V. St. ν. America July 5, 1963 (293 066) -

end holding members formed by support struts arranged at a flat angle of less than 45 ° are, which are in the installed state under flat contact with the spigot end on the one hand against that of the spigot end adjacent edge part of the inner wall surface of the retaining collar of the socket end and on the other hand Support against the circumferential shoulder of the spigot end.

In the case of a socket connection formed in this way, the holding members form in the longitudinal direction the pipe connection effective supports in which a tilting movement as a result of their preferably A flat incline significantly below 45 ° is avoided. This is also helped by the fact that the holding members in the installed state lie flat on the insertion end and in this position through the radial Pressure forces of the sealing ring compressed in the radial direction are retained.

The invention is described below with reference to the embodiments shown as examples in the drawing. In the drawing shows

809 558/169

3 4

F i g. 1 shows a longitudinal section through the axis of one of the inner wall surfaces 5 of the retaining collar 6

first embodiment of the ring-sealed socket-facing end face 12 and has a

Connection according to the invention before the joint inner surface 13, the inner diameter of

drive the pipes, a maximum dimension at the end face 12 up to one

F i g. 2 one of the F i g. 1 corresponding part 5 to the smallest extent on the sealing part 10 decreases. Of the

cut after the pipes have been brought together, the outer diameter of the sealing ring is not

F i g. 3 and 4 show a partial section and a partial top-mounted state of the ring somewhat larger than that

sees the sealing ring of the socket connection diameter of the axial bottom wall surface 8 of

1 and 2 in a larger view, annular groove 4, so that the sealing ring when inserted

F i g. 5 is a partial view of the sealing ring of the joint socket joint in the annular groove 4 in the circumferential direction according to FIG. 1 and 2, from which the is pressed and by this pressure during the Her-assembly the retaining member is firmly caught in its position at the inner changeover of the socket connection of the sealing ring can be seen, will hold. As indicated by the hatching in FIG. 1, 2

F i g. 6, 7 and 8 of FIG. 3 corresponding part and 3 is indicated, the sealing ring 3 consists of

cuts through other embodiments of the seal 15 resilient material such. B. rubber

support ring and or synthetic rubber. The material of the sealing

F i g. 9, 10 and 11 partial sections of the socket connection ring can be used over the entire cross-section of the ring

fertilize with the sealing rings according to Fig. 6, 7 away have the same hardness. The sealing ring

and 8 when the pipes are closed. but can also be designed in such a way that its

The socket connection according to FIG. 1 to 5 is used for ao sealing part 10 made of a soft, slightly deformed connection of pipes, which are each provided with a single rubber and the plug end 1 facing the retaining collar 6 and a socket end 3, a cross-sectional part made of hard rubber. These between which a sealing ring 3 made of one of two types of sealing rings are known in the case of elastic polymerisation products in a sealed socket joint.
Annular groove 4 of the socket end 2 is arranged. To hold the male end 1 in the female sealing ring 3 serves to form a liquid window end 2, according to the invention, several ends and the male end of the two pipes and are in the inner or gas-tight connection between the female conical surface 13 of the sealing ring For this purpose, retaining members 14 are arranged at a circumferential distance from one another between these two parts. In addition, a ring is pressed together at an axial distance behind on its sealing part 10 in the radial direction 30 of the front edge of the insertion end 1. The sealing ring is designed in such a way that the notch is arranged in such a way that when the raw material is moved together and dimensioned so that it leaves a considerable deformation in the area of the holding members 14 and forms a perfect seal even with the shoulder 15 running in the circumferential direction, there are considerable manufacturing tolerances The inner ends are supported against this shoulder. 35 of the holding members 14 when the tubes are closed

The annular groove 4, which receives the sealing ring, is ab, thereby creating a mutual axial movement the socket end through the inner walls see the retaining links and the spigot end at Training 5 of a retaining collar 6 limited against the occurrence of a force that tries to reach the insertion end Insertion end 1 is directed. Pulling the inside diameter out of the socket end prevents it of the retaining collar 6 is slightly larger than the outer 40 is. The holding members 14 are on the inner surface diameter of the plug-in tube and therefore forms the sealing ring so arranged that it extends from an opening in the socket end which is large enough to extend the end face 12 to a point which around the spigot end 1 under all conditions that are shortly before the thickest part of the sealing part 10 arise as a result of the manufacturing tolerances. You're either through to the sealing ring gain weight. On the opposite side, the 45 vulcanization or adhesive is firmly attached Sealing ring receiving annular groove 4 brought through, in such a way that it is with the longitudinal one Wall surface 7 is limited to the axis of the axis of the pipes in the same way as the conical socket end 2 is directed to. The two wall inner surfaces of the sealing ring see flat angles surfaces 5 and 7 of the annular groove 4 are formed by a, which allows the insertion of the insertion end into the allow substantially axially extending bottom wall 50 sleeve ends. When the raw surface is closed 8 connected, in which an annular front is supported by the retaining collar 6 of the socket jump 9 is arranged. end facing end of each holding member 14 from FIGS. 1, 3, 4 and 5, in which the shape of the against the inner wall surface 5 of the retaining collar, Sealing ring 3 in the non-installed state, this end when the pipes are brought together shows, it can be seen that the sealing ring 3 is pushed into one 55 from the beveled edge of the axial direction elongated cross-section on the insertion end remains free, while the other which is provided with a sealing part 10. End of each holding member 14 in the insertion This Sealing part is protruding in the radial direction thick track of the insertion end 1, so that this than the radial dimension of the annular space between the ends when the insertion end is pushed in see the outer surface of the insertion end 1 and the 60 this are displaced radially outward. if Bottom wall surface 8 of groove 4 in the socket end formed the shoulder 15 of the male end when assembled when the pipes are moved together the pipes come into a position in which they are will. The outer surface of the sealing ring is against one another with the axially inner ends of the retaining members 14 Provided annular groove 11, which overlaps with the annular, so the between the Halteglie-projection expands 9 in the socket end 2 cooperates 65 and the axial bottom wall surface 8 of the ring and the sealing ring when the groove 4 is pressed together rubber of the sealing ring Pipes or in the manufacture of the Muffenverbin- and forces these ends of the holding members 14 to charge holds in place. The sealing ring is to enter the ring notch. The ring notch can

5 6

have any design that has a shoulder for making the socket connection

forms against which the ends of the retaining members with sealing ring 3 with the retaining elements attached to it

Can apply security to the necessary links 14 first in the annular groove of the socket

Latch is used between the insertion end and the holding end 2, so that it is the one shown in FIG. 1 shown

to ensure breakdown. 5 occupies position. Then the inner surface of the

The radial thickness of the retaining members 14 is the sealing ring and / or the outside of the calibration, that the holding members are coated with a lubricant through the gap between them the retaining collar 6 and the spigot end 1 towards the spigot end 1 through the sealing ring can slide through and that a Verfor- is pushed through into the socket end. the tion of the holding members when axial io inclination of the holding members 14 and the inner surface Forces is prevented. The width of the retaining members 13 of the sealing ring allow the Ein-14 in the circumferential direction is relatively small, so stuck 1 enters the sealing ring before it that the holding members come into contact with her with this, with a small one can apply the entire width to the shoulder 15. Angle of incidence between the spigot end and the This avoids having the retaining members separate from the retaining members and the sealing ring corresponding to the rounding of the spigot end is curved. Preferably the leading edge of the insert is formed must be, and allows the end 1 to be tapered to provide a convenient one-holding link with simple flat metal plates the angle of inclination is achieved in all conditions. At the can be formed. The cross-section becomes between the holding members advancing the insertion end is in the circumferential direction so much intermediate 20 of the sealing ring is reduced in the radial direction Leave space that the sealing ring for insertion and expanded in the axial direction, the inner ends of the holding members are deformed to a sufficient extent in the annular groove radially outward can be moved without applying greater forces. The sealing ring is against need to be an axial movement due to the interaction when inserting a seal ring that does not have such retaining members. Front 25 of the annular projection 9 in the socket end Preferably, the holding members are in the circumferential direction and the groove 11 on the outer circumference of the seal evenly spaced. Your ring protected. When the shoulder 15 of the insertion number the axially inner end of the holder can be used for the various pipe sizes and ends longitudinal forces to be expected are easily determined, then these are determined by the in the the. In the illustrated embodiment, the sealing ring is stored force radially inward Holding members pressed into corresponding recesses in the notched groove and to rest against the Sealing ring embedded. However, you can bring shoulder 15. If now a longitudinal tensile force should also occur on the inner conical surface 13 of the socket joint, the Sealing ring attached or in the rubber shoulder 15 against the ends of the retaining members 14 gedes Sealing ring still further embedded 35 pulled, this force on the retaining members be. the retaining collar 6 is transferred and the plug-in

The angle between the holding members 14 and the end is prevented with certainty from being pulled out of the longitudinal axis of the pipes in a finished socket socket end,
Binding is less than 45 ° according to the invention. In FIGS. 6 to 11, three modified configurations are shown. While the ends of the retaining members are positioned against the guide shapes of the sealing ring and the socket retaining collar 6 at an angle, the steep fen connection according to FIG Invention shown. This is enough to prevent the ends of the holding embodiments from having basically the same members on the wall surface 5 of the holding collar along features as the embodiments according to FIG. 1 slide radially outwards. To improve the down to 5 and also act in the same way with the support angle between the holding members 14 and the 45 moving together of the pipes. They differ from the retaining collar 6, it is expedient to bevel the inner corner of the retaining collar 6, however, with regard to the shape of the sealing rings, in order to provide essentially right-angled support between the retaining sleeve ends and the grooves receiving the sealing rings. With each of these execution members and the wall 5 to be achieved, how to form from the sealing ring is in turn in a ring F i g. 1 and 2 can be seen. The small angle between the 50 groove of the socket end inserted in such a way that you can see the holding members and the longitudinal axis of the front face of the sealing ring on the inner pipes, the holding members rests against the wall of the retaining collar of the socket end The ring groove is elongated in the axial direction and form support struts that are formed in the, and the sealing ring has to be effective only in the longitudinal direction. 55 pushing the insertion end again an inside. This also prevents the holding diameter from tilting from a maximum dimension on the links when tensile forces occur in the socket end face 12 that is greater than the outside connection around its inner ends - Knife of the spigot end, move up to a minimum and thereby undesirably decrease on the sealing part, which is smaller than the high hoop stresses in the socket end or the outer diameter of the spigot end. In addition, harmful squeezing forces at the male end result in the sealing ring in turn being provided with a large number of retaining members, as is the case with large support angles, which are attached to the conical interior. It is essential for the invention that the surface of the sealing ring are fastened, and on the retaining members through the insertion end in the radial direction is in turn an annular notch and compressing the sealing ring and 65 net, which forms a shoulder against which the inner the support the ends of the retaining members exerted by the sealing ring. In the case of the socket radial pressure forces in their flat position, the connection according to FIG. 9 is a sealing ring. speaking F i g. 6 used, which is through a ring

shaped projection 9 in the socket end and a groove 11 on the outer circumference of the sealing ring against axial displacements is secured. In the embodiment of FIG. 10, a sealing ring is used 7 against axial displacements through a groove 9 'in the socket end and a Rib 11 'secured on the outer circumference of the sealing ring. In the embodiment of FIG. 11 is a sealing ring according to FIG. 8 is used, which prevents axial displacements inward thereby it is ensured that the rear end face of the sealing ring against the radial rear wall surface 17 creates the groove arranged in the socket end.

In all of the illustrated embodiments, the holding members 14 must be made so strong and stiff be that the engaging in the ring notch of the male end corners cannot be sheared off and that the retaining members cannot buckle when loaded. In any case, the holding members are preferably designed as flat plates; but you can also use the rounding of the insertion end be adapted, thereby allowing the use of a smaller number of wider retaining members will.

In the case of a pipe connection according to FIGS. 1 to 5 for cast iron pressure pipes about 30 cm in diameter, twenty holding members made of Corten steel were attached at equal intervals to the inner circumference of the sealing ring. Each support member was 0.46 cm thick, 1.27 cm long in the axial direction and 2.54 cm wide in the circumferential direction. The holding members were attached firmly to the rubber of the sealing ring by a cold curing process in recesses in the rubber ring, as can be seen essentially from the drawing. The ring notch at the spigot end was 0.2 cm deep at the root. After the socket connection had been produced, the ends of the pipes were tightly sealed by sealing plugs, whereupon the socket connection was subjected to ^{an internal pressure of around 50 kg / cm 2.} There was no leakage or separation of the socket connection or any deterioration in any of the parts of the socket connection.

Claims (3)

Patent claims: 1. Ring-sealed socket connection for pipes with a circumferential distance from each other permanently attached retaining members, in the installed state in a wide ring groove of the socket end under pressure by radial pressure forces arranged wide sealing ring, the with an end face on the inner wall surface of one of the annular groove delimiting the outside, the Spigot end with little play comprehensive retaining collar of the socket end and with the inner one and outer peripheral surface of its sealing member sealingly under pressure to the substantially cylindrical outer surface of the insertion end and the opposite bottom surface the annular groove rests, characterized in that with a known arrangement a shoulder (15) running in the circumferential direction at an axial distance from the free one End edge of the insertion end (1) the holding members through at a shallow angle of less than 45 ° arranged support struts (14) are formed, which are in the installed state under flat contact the spigot end (1) on the one hand against the edge part of the inner one adjoining the spigot end Wall surface (5) of the retaining collar (6) of the socket end (2) and on the other hand against the circumferential shoulder Support (15) of the spigot end (1). 2. socket connection according to claim 1, characterized in that the support struts (14) are thicker in the radial direction than the gap between the retaining collar (6) of the socket end (2) and the outer surface of the male end. 3. A compound according to any one of the preceding claims, characterized in that the Support struts (14) are fastened in recesses in the inner circumferential surface of the sealing ring. Considered publications:
Italian Patent No. 594113;
U.S. Patents Nos. 2,230,725, 2,226,304,
2201372. 1 sheet of drawings 809 558/169 5. 68 © Bundesdruckerei Berlin