DE202012013675U1 - Device for sealing an annular space between a media pipe / cable and a core bore / protective tube - Google Patents

Abstract

Device (1) for sealing annular spaces (9) delimited at the outer and inner areas by cylindrical and / or oval bodies (2, 3), in particular for sealing cables, pipes (3), channels or the like which pass through Core holes, wall sleeves or protective tubes are guided, with a cross-section of the annular space (9) filling ring segment (8), which is at least partially made of elastomeric material and at both axial faces of one-piece or multi-piece pressure plates or flanges (7) made of hard plastic or metal flanked, which are positioned by means of screw connections (6) and distribute the compressive forces applied by the screw connections (6) flatly to the ring segment (8) and thus lead to axial compression and radial expansion of the sealing segment (8) which is tightly clamped thereby, characterized the ring segment (8) is an annular disc-shaped core element (5) made of an elastomer having, with its disc plane parallel to the pressure plates or flanges (7) is arranged and through which screws through the screw corresponding openings in the core element (5) extend therethrough and at least at its the inside surface (3) facing inner surface of a jacket member (4) is covered by an elastomer, wherein the material of the core element (5) has a greater Shore hardness than that of the jacket element (4) and that the annular disk-shaped core element (5) from the jacket element (4) is covered or encased on all sides by the tougher core element (5) being encapsulated by a softer elastomer used for the jacket element (4).

Description

The present invention relates to a device for sealing annular spaces bounded in the outer and inner regions by cylindrical and / or oval bodies, according to the preamble of claim 1.

In such devices for sealing of annular spaces, as for example from the DE 296 19 196 A1 , the EP 0 620 396 A1 , the DE 201 12 374 U1 , the DE 10 2006 047 066 A1 as well as the DE 202 00 374 U1 are known, the ring segment is made of a one-component elastomer, preferably rubber, which has a medium to hard hardness (Shore hardness). In use with media-carrying thin-walled plastic corrugated pipes and / or in the Fernheizwärme pipeline construction, foamed for insulation media pipes with thin plastic outer jacket, the plastic corrugated pipe or the plastic outer shell is deformed in the required for pressing the elastomer element pressurization so that the annulus is no longer tight against liquids and gases. In addition, under the partial contact pressure of the annular space seal, these plastic pipes or casings are subject to a molecular cold flow, which after some time leads to shrinkage in the outer diameter and thus initiates the leakage of the sealing system.

When using very soft elastomeric sealing elements which do not damage the pipe outer casing, the required dimensional stability is lacking, that is, the elastomer material swells due to the pressing pressure through the pressure plates from the annular gaps between the pressure plates or flanges flanking the elastomer and the core bore in the masonry or the inner wall of protective tubes / sheaths and through the annular gap between the pressure plate / flange and the media tube, so that the sealing system is leaking. In addition, soft rubber settings are generally not UV-resistant and embrittle under sunlight or daylight. Although the UV resistance can be improved in the production by additionally admixed UV stabilizers, but due to the cost intensity of the required additives significantly reduces the economy of the sealing inserts in the production. Without the required elasticity of the elastomeric sealing segment occurs at a reduction of the tightening torque or reducing the pressure force of the mutually bolted side pressure plates along the threads of the continuous through the sealing element screws or threaded bolt due to the capillary action, the medium through the sealing system.

From the DE 196 01 288 C2 Furthermore, a device for sealing annular spaces is known in which in the axial direction, for example, three ring segments abut each other, of which the central ring or profile element has a lower Shore hardness than the outer profile elements. This means that the sealing effect with respect to the internal body takes place only over a relatively narrow axial region, while the disadvantages of the aforementioned known devices occur with the corresponding axial initial relationship or end regions. The DE 101 10 647 A1 shows features of the preamble of claim 1.

Object of the present invention is therefore to provide a device for sealing of annular spaces of the type mentioned, in which the disadvantages mentioned are avoided and in particular in the interior of the annulus seal, which points to the inner body, a seal even at lower axial compressive forces is reached even if the internal body has a relatively thin outer shell and / or a corrugated outer shell.

To solve this problem, the features specified in claim 1 are provided in a device for sealing annular spaces of the type mentioned.

By the measures according to the invention it is achieved that the region of the annular space seal, which points to the inner body, is tightly clamped against this inner body, for example here against the media-carrying tube, without too great axial compressive forces must be expended.

Overall, the axial compression leads to a radial expansion in particular of the jacket element against the environment, that is in any case to the inner body and depending on the design of the shell element also to the outer body. To accommodate the helical compressive force and dimensional stability, the sealing relationship ring segment consists of a harder to hard core component of thermoplastic, thermosetting or rubber element and pressure distribution on the media tube / cable, especially in thin-walled pressure-sensitive pipe walls and corrugated pipes, in only low compressive forces at low torques can receive the screw connection, from a softer shell element of a thermoplastic, thermosetting or rubber element, preferably of a UV-resistant thermoset elastomer with soft hardness adjustment. In particular, with complete embedding of the harder Trägerbeziehungsweise core element in The softer sheathing casing or casing element is consequentially pressed the softer elastomeric material even at low torques in the screw threads of the pressing screws, which prevents liquid and gaseous ambient media due to capillary action along the threads of the sealing insert or the segment can penetrate. Furthermore, it is advantageous that, due to its higher coefficient of friction, the softer elastomer material is pressed against the inner wall of the core bore or of the protective tube, ie, with respect to the outer body, even at low tightening torques. Due to the low pressure forces against the media tube or cable, so the internal body, and the cold flow of the molecular chains of the polymeric pipe / cable walls is reduced under pressure, which in turn leads to a higher sealing performance of the device.

• 1 in schematischer Darstellung einen Querschnitt durch eine Vorrichtung zum Abdichten eines Ringraumes, der von einem außenliegenden und einem innenliegenden sich axial erstreckenden Umfangsbereich eines zylindrischen und/oder ovalen Körpers begrenzt ist, und
• 2 einen Schnitt längs der Linie A-A der 1.

Further details of the invention can be found in the following description in which the invention with reference to the embodiment shown in the drawing is described and explained in more detail. Show it:

• 1 schematically a cross-section through an apparatus for sealing an annular space bounded by an outer and an inner axially extending peripheral portion of a cylindrical and / or oval body, and
• 2 a section along the line AA the 1 ,

The device shown in the drawing 1 consists of at least one (or more) the cross-section of an annulus 9 filling circular or oval ring segment 8th which is at least partially made of elastomeric material. At the elastomeric ring segment 8th is axial at both ends, that is at the end faces 10 and 11 at least one respective pressure element or a pressure plate 7 made of compact material, such as metal or hard plastic flange mounted. The double-sided, annular pressure plates 7 are by means of several evenly distributed over the circumference arranged screw connections 6 that the ring segment 8th penetrate axially, positioned and distribute the applied by tightening pressure forces flat on the ring segment 8th ,

The annulus 9 is through an external body 2 as well as through an internal body 3 limited. The outer body 2 is, for example, the masonry of a building in which a core hole 12 is introduced, which is the outer wall of the annulus 9 represents. It is understood that instead of a core hole as the outer boundary of an annulus 9 Also, a wall sleeve or a protective tube or the like may be provided. The inner body 3 For example, a cable or a pipe or a channel, wherein the pipe or the channel can be provided with a thin outer shell with the interposition of an insulation covering or a corrugated outer shell, wherein the outer circumference of the inner boundary of the annular space 9 forms. The outer and / or inner boundary of the annulus 9 can be cylindrical, that is circular or oval.

The ring segment 8th is composed in the embodiment of two elements, namely a core element 5 and one the core element 5 all. enveloping jacket element 4 , In the illustrated embodiment, the cross-sectionally rectangular core element is here 5 from the jacket element 4 completely enveloped, that is, over all four side surfaces of the core element 5 , The jacket element 4 and the core element 5 each consist of an elastomer, but in each case an elastomer or material of different Shore hardness. It has the material of the core element 5 a greater Shore hardness than that of the shell element 4 , The harder core element 5 is in the embodiment within the softer shell element 4 , In this case, the walls of the jacket element 4 have the same thickness over the circumference; but it is also according to 2 possible, the wall of the jacket element 4 opposite the core element 5 in the area to enlarge the inner body 3 is facing. As mentioned, the ring segment 8th annular and has an outer diameter, the inner diameter of the core hole 12 corresponds, and an inner diameter, the outer diameter of the inner body 3 equivalent.

The ring segment shown in the drawing 8th is for example made in such a way that the harder core element 5 is placed in an injection mold and one for the jacket element 4 used softer elastomer is overmoulded.

The individual components (jacket element 4 and core element 5 ) can also be manufactured in one operation instead of two. The connection of the individual components 4 and 5 can be produced by vulcanization, bonding, preferably cold crosslinking.

Will the ring segment 8th in the annulus 9 introduced, this is done without significant play. The screw connections 6 be tightened one after the other evenly to a certain torque, which in the embodiment according to the drawing in such a way that the jacket element 4 expands in the circumferential direction outwards and inwards because it is axially compressed. Due to the relatively low Shore hardness, it is also possible inner body 3 with wavy outer surface by means of the jacket element 4 seal without too high tightening torques on the screw connection 6 must be applied.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 29619196 A1 [0002]
• EP 0620396 A1 [0002]
• DE 20112374 U1 [0002]
• DE 102006047066 A1 [0002]
• DE 20200374 U1 [0002]
• DE 19601288 C2 [0004]
• DE 10110647 A1 [0004]

Claims (1)

Device (1) for sealing annular spaces (9) delimited at the outer and inner areas by cylindrical and / or oval bodies (2, 3), in particular for sealing cables, pipes (3), channels or the like which pass through Core holes, wall sleeves or protective tubes are guided, with a cross-section of the annular space (9) filling ring segment (8), which is at least partially made of elastomeric material and at both axial faces of one-piece or multi-piece pressure plates or flanges (7) made of hard plastic or metal flanked, which are positioned by means of screw connections (6) and distribute the compressive forces applied by the screw connections (6) flatly to the ring segment (8) and thus lead to axial compression and radial expansion of the sealing segment (8) which is tightly clamped thereby, characterized the ring segment (8) is an annular disc-shaped core element (5) made of an elastomer having, with its disc plane parallel to the pressure plates or flanges (7) is arranged and through which screws through the screw corresponding openings in the core element (5) extend therethrough and at least on its inner body (3) facing the inner surface of a Jacket element (4) is covered by an elastomer, wherein the material of the core element (5) has a greater Shore hardness than that of the jacket element (4) and that the annular disk-shaped core element (5) is covered or encased by the jacket element (4) on all sides, in that the harder core element (5) is encapsulated by a softer elastomer used for the jacket element (4).

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