DE102007048119B4 - Sealing ring for a push-in joint between two pipes - Google Patents

Abstract

Sealing ring for a push-in socket connection of two pipes, in particular drain pipes, which is insertable into the annular bead of the socket end of a first tube, with a radially outwardly corrugated contact surface (2) for abutment against the bead bottom of the annular bead and at least one inside lip seal (1) to the plant the outer side of a spigot end of a second tube which can be pushed into the socket end of the first tube, wherein the abutment surface (2) and the at least one lip seal (1) are formed of a flexible, soft rubber or plastic material having a radially between abutment surface (2) and the hard plastic ring (3) arranged at least one lip seal (1), characterized in that the plastic ring (3) in the axial direction is wider than the contact surface (2) and the at least one lip seal (1), and that the plastic ring ( 3) several circumferentially distributed openings or edge-side Ausneh mung (10) for connecting the material of contact surface (2) and lip seal (1).

Description

The The invention relates to a sealing ring for a push-in joint of two Tubes according to the preamble of claims 1 and 2.

Such Sealing rings are usually used in the annular beads of socket ends of sewer pipes. The seal is made to the bottom of the bead via a radial direction externally corrugated contact surface and to the tip end of a tube inserted into the socket a lip seal, as a simple lip or as a double lip can be trained.

Such Seals, which have been known for decades, have over the course of Time a lot of changes and improvements. To increase stability and to Avoiding the loss of such a seal, often already factory in the sleeves is used, plastic rings have proven, the be inserted into a recess of the seal. By means of such Plastic rings, the seals are therefore relative to the bottom of the bead firmly anchored, making their removal from a sleeve difficult possible is.

It Seals have also become known, consisting of two components exist, namely a soft rubber or plastic for sealing the pipe connection and a hard plastic to increase stability.

From the DE 203 20 542 U1 a sealing ring is known, which consists of a sealant, which partially surrounds a core of harder plastic, such as PP, wherein the core rests against the side facing away in the insertion flank of the bead of a tube. The core is thus surrounded by sealing material on one side.

To the Part of the core is also on the bottom of the sickle. This condition leads to, that in particular in the bead area in which the core of the gasket exposed, only the core determines the location of the seal. This is problematic when big Tolerance ranges are to be respected or if soiling in the Beading are present, which are not compensated by the core yes can.

In the DE 10 2004 038 333 A1 a similar sealing ring is specified, but the core is arranged at the beginning of the seal in the insertion direction of the tube of the bead. The core is thus on the opposite side of the previously stated DE 203 20 542 U1 , The shape of the core of DE 10 2004 038 333 is angularly shaped, so that there is a cavity in the bead between the protruding leg of the core and the bead bottom.

Two-component rings with unilaterally arranged harder material are already through the US 6,277,315 , the EP 0 156 222 B2 and the GB 1,063,745 known.

From the WO 00/7360 A1 is known a sealing ring, which also contains only one-sided sealant. This document contains no information about how the sealing material from the outside and inside of the sealing ring could be connected to each other. The core of the seal follows the peripheral shape of the inner and outer soft seals, with the inside containing no lip seal.

One common feature of all known two-component sealing rings is in that the components essentially abut each other in the axial direction limits, and that the percentage of the harder component is relatively small in relation to the total material used for the seal.

Of the Invention is therefore based on the object, a sealing ring for a push-in socket connection specify two tubes, as a two-component sealing ring with a relatively soft Seal material and a relatively hard plastic ring formed is, with the material content of the plastic ring as possible high chosen is, which has a high strength and is inexpensive to produce.

These The object is achieved by the invention specified in claims 1 and 2 solved. Advantageous developments of the invention are specified in subclaims.

The Invention is based on a sealing ring for a push-in socket connection two pipes, such as drain pipes, in the annular bead the socket end of a first tube is used. The sealing ring has a corrugation on the outside in the radial direction contact surface to the plant to the bead bottom of the ring bead on and at least one inside lip seal for fitting to the outside of one in the socket end the first tube insertable spigot end of a second tube.

there are the contact surface and the at least one lip seal made of a flexible soft Rubber or plastic material formed, which with a radial between contact surface and the at least one lip seal arranged hard plastic ring connected is.

According to the characterizing features of claim 1, the plastic ring is wider in the axial direction than the contact surface and the at least one lip seal is formed. The plastic ring also has several circumferentially distributed Breakthroughs or edge-side recesses over which the material of the contact surface and the lip seal is interconnected.

In order to let yourself an improved connection between soft sealing material and hard plastic ring reach and further, the plastic ring is characterized by injection molding easier to produce in an injection process.

alternative can according to the characterizing ones Features of claim 2 one or both ends of the plastic ring have a circumferential annular gap, which on the one hand facilitates the If necessary, sealing ring by means of a tool, eg. B. a screwdriver, herauszuhebeln from the annular bead, and on the other hand leads the weakening of the material of the plastic ring at the end faces due to Annular gaps to give the end faces some flexibility which allows a better adaptation to the edge shape of the annular bead.

The inventive training Such a sealing ring allows a high proportion of hard Plastic material to use without the radial sealing properties between sealing ring and bead base on the one hand and sealing ring and spigot end a tube to be inserted on the other hand be impaired. The plastic ring used ensures high stability of the sealing ring, and prevents the accidental or easy release a sealing ring from a bead. Furthermore, the plastic ring secures the axial fixing of the sealing ring in the annular bead, so that too no tight fit of seal and / or pipes to be connected unacceptable axial displacement of the sealing ring is to be feared.

The Production of the sealing ring according to the invention can essentially be in a manufacturing process in a multi-component injection molding tool respectively.

The Seal is preferably designed such that bearing surface and Sealing lip in the axial direction of the plastic ring the plastic ring do not excel. This does not give you over the plastic ring projecting in the axial direction soft material, so that the axial positioning of the sealing ring alone by the Plastic ring can be produced.

to still further improving the connection between soft material and plastic ring can be provided that the plastic ring circumferentially distributed projections has, which protrude into the material of the lip seal. The projections prevent at high insertion pressure of einzusteckenden tube a Shearing the lip seal from the plastic ring.

The Material of the contact surface and the lip seal is preferably made of a thermoplastic Polymer, such as TPE, TPU. Alternatively, the material may be formed of EPDM be.

The Material of the plastic ring is preferably made of polypropylene or comparable plastics.

The preferred choice of material of plastic ring and contact surface or Sealing lip leads because of the higher Proportion of polypropylene on the total amount of material of the sealing ring in addition to the same or improved sealing properties of the sealing ring the total material costs can be reduced.

The Invention will be explained in more detail with reference to an embodiment.

It demonstrate:

1 a sealing ring in side view,

2 a sealing ring in sectional view,

3 an enlarged cross-sectional view along the section line AA of 1 .

4 an enlarged cross-sectional view along the section line BB of 1 .

5 a view of a sealing ring with double seal, and

6 a perspective view of a plastic ring.

1 shows the sealing ring in axial view in supervision. On the outside there is a contact surface 3 for contact with the bottom of a sump of a sewage pipe. The inside of the sealing ring contains a lip seal 1 for engagement with the spigot end of a tube to be inserted.

Such Sealing rings can preferred for Sewer pipes of building services up to the diameter of about 400 mm used. For larger diameters become predominantly Concrete pipes used with alternative sealing concepts. The invention however, is not limited to the specified diameter range.

2 shows the sealing ring in a sectional side view. In particular, the formation of a radial sequence of lip seal 1 , Plastic ring 3 and contact surface 2 recognizable.

3 shows a detail of the sealing ring along the sectional area AA of 1 , The 3 shows the Plastic ring 3 , which forms the core of the sealing ring, on the inside of a lip seal 1 is formed, while on the outside of a contact surface 2 is present, which is wave-shaped, in order to achieve a better sealing effect on the bead bottom of a sleeve. On the inside of the plastic ring 3 is distributed around a row, in particular 12 , of pin-shaped or button-shaped bases 4 , which increase the anchoring effect between lip seal 1 and plastic ring 3 to lead. The bases 4 also serve to improve the shear strength of the lip seal 1 in conjunction with the plastic ring 3 ,

The plastic ring 3 also includes axially directed circumferential annular gaps 5 and 6 , This annular gap makes it possible to remove a sealing ring when needed with simple tools again from a sleeve. Further, the annular gap is used to reduce the amount of material and also increase the flexibility of the front ends of the plastic ring, so that there is a more flexible adaptation to the edges of the annular bead of a plastic pipe.

4 shows a sectional view along the section line BB of 1 , At the location of the cutting line, the plastic ring has a rectangular recess on one end face 7 on, through which in the manufacture of the sealing ring, the sealing material from the outside to the inside of the plastic ring or vice versa, flow, so that the material of the contact surface and the lip seal can be created in a single pass. The sealing ring has circumferentially distributed a plurality of such openings, in particular 12 Breakthroughs, each alternating to the bases 4 are formed. Instead of recesses 7 In case of a suitable injection tool also breakthroughs can be used by the plastic ring. End-side recesses, however, facilitate the construction of an injection molding tool.

The 3 and 4 clearly show that the plastic ring forms the largest proportion of material in the sealing ring. Nevertheless, there is sufficient sealing to the bottom of the bead through a running over the entire axial length of the bead bottom corrugated contact surface and a lip seal on the inside of the sealing ring.

5 shows an alternative form of a sealing ring, in which instead of a lip seal 1 according to the 1 - 4 double lip 8th and 9 be used. The remaining construction of the lip seal is no different from a seal according to the 1 - 4 , Double lips can then be used if increased demands are placed on the tightness of a sealing ring.

6 shows an insulated plastic ring 3 in perspective view. The circumferential recesses 10 serve the material transfer between lip seal and contact surfaces. Further shows 6 the inside points 4 for improving the material anchoring between plastic ring and lip seal.

The Number of breakthroughs and bases can be varied as needed.

When Material of the plastic ring is preferably polypropylene (PP) can be used, which has a high mechanical strength at the same time low cost and high durability. As material of contact surface and lip seal is preferably a thermoplastic polymer (TP, TPE, TPU) or EPDM usable. But there are others too elastomeric materials, such as SPR, usable.

1

lip seal

2

contact surface

3

Plastic ring

4

base

5

surrounding annular gap

6

surrounding annular gap

7

recess

8th

lip

9

lip

10

recess

Claims (6)

Sealing ring for a push-in socket connection of two pipes, in particular drainage pipes, which can be inserted into the annular bead of the socket end of a first pipe, with a radially outwardly corrugated contact surface ( 2 ) for contact with the bead bottom of the annular bead and at least one inside lip seal ( 1 ) for engagement with the outside of a sleeve end of the first tube insertable tip end of a second tube, wherein the contact surface ( 2 ) and the at least one lip seal ( 1 ) are formed from a flexible soft rubber or plastic material, which with a radially between contact surface ( 2 ) and the at least one lip seal ( 1 ) arranged hard plastic ring ( 3 ), characterized in that the plastic ring ( 3 ) in the axial direction wider than the contact surface ( 2 ) and the at least one lip seal ( 1 ) is formed, and that the plastic ring ( 3 ) several circumferentially distributed apertures or edge-side recesses ( 10 ) for connecting the material of contact surface ( 2 ) and lip seal ( 1 ) having. Sealing ring for a push-in socket connection of two pipes, in particular drainage pipes, which can be inserted into the annular bead of the socket end of a first pipe, with a radially outwardly corrugated contact surface ( 2 ) for contact with the bead bottom of the annular bead and at least one inside lip seal ( 1 ) for engagement with the outside of a sleeve end of the first tube insertable tip end of a second tube, wherein the contact surface ( 2 ) and the at least one lip seal ( 1 ) are formed from a flexible soft rubber or plastic material, which with a radially between contact surface ( 2 ) and the at least one lip seal ( 1 ) arranged hard plastic ring ( 3 ), characterized in that the plastic ring ( 3 ) in the axial direction wider than the contact surface ( 2 ) and the at least one lip seal ( 1 ) is formed, and that one or both of the axially directed end faces of the plastic ring has a circumferential annular gap ( 5 . 6 ) exhibit. Sealing ring according to claim 1 or 2, characterized in that the plastic ring ( 3 ) inside circumferentially distributed vertices ( 4 ), which in the material of the lip seal ( 1 protrude). Sealing ring according to claim 1 or 2, characterized that the material of the contact surface and the lip seal formed of a thermoplastic polymer is. Sealing ring according to claim 1 or 2, characterized that the material of the contact surface and the lip seal is made of EPDM. Sealing ring according to claim 1 or 2, characterized that the plastic ring is made of polypropylene.