The invention relates to a pipe connection in accordance with the preamble of claim 1. The invention furthermore relates to a sealing ring for a pipe connection in accordance with the preamble of claim 7.
For implementation of screwed pipe connections, pipe connections are known that comprise a connection body that holds the pipe end to be connected and onto which a nut can be screwed. The connection body has a cylindrical bore for holding the pipe end, wherein the pipe end is provided with a formed part that projects outward, the first clamping face of which part lies against the end face of the connection body. A second clamping face of the formed part is configured to be conical and lies against a conical bore of the nut. By tightening the screw connection between nut and connection body, the formed part that projects outward can be pressed against the end face of the connection body. To seal the connection body relative to the pipe held by it, the connection body is provided with a conical bore that extends all the way to the end face of the connection body and widens in the direction toward the end face, and thereby a holder for a sealing ring is formed between connection body and pipe. The sealing ring has an essentially triangular cross-section, corresponding to the holder that is formed. Such a pipe connection is known, for example, from DE 195 26 316 A1.
In the case of pipe connections of the aforementioned type, it can happen, depending on the configuration of the sealing ring, that the sealing ring is twisted or actually everted completely during the course of installation, and thereby the sealing effect and also the durability of the sealing ring can be impaired.
This is where the invention seeks to provide a remedy. The invention is based on the task of making available a pipe connection of the aforementioned type, which can be produced with minimized effort and in which twisting or eversion of the sealing ring is prevented. According to the invention, this task is accomplished by means of the characteristics of the characterizing part of claim 1.
With the invention, a pipe connection of the aforementioned type is created, in which twisting or eversion of the sealing ring is prevented. Because of the fact that the sealing ring has a polygonal, symmetrical cross-section, it is guaranteed that a force applied to one side generates a corresponding opposite force, and thereby a symmetrical pressure distribution in the sealing ring is achieved. It has been shown that a polygonal sealing ring having a symmetrical pressure distribution has a significantly lesser tendency toward twisting or eversion. Furthermore, the sealing ring fulfills its function even if it is “everted.”
Preferably the recess is formed by means of a conical bore that extends all the way to the end face of the connection body and widens in the direction toward the end face, which bore opens, at its smallest diameter, into a cylindrical bore of the connection body, the inside diameter of which bore preferably corresponds essentially to the outside diameter of the end section of the pipe held by the connection piece.
In a further development of the invention, the first clamping face of the pipe makes a transition into a connection surface, which narrows conically in the direction of the cylindrical end section of the pipe. In this way, an angled transition for holding a peak line of the sealing ring is formed, and thereby stable positioning of the sealing ring is made possible.
In an embodiment of the invention, the sealing ring has a pentagonal or hexagonal cross-section. In this way, contact sides for sealing the sealing surfaces of a pipe connection are formed, which sides are connected by way of peak lines, which allow the formation of directed reset forces. Alternatively, the cross-section of the sealing ring can also have more than six corners. In this regard, in the present case, the term “corner” or “angular” also subsumes a radius, in the present case, which connects two surfaces set at an angle relative to one another.
In the present case, a “peak line” is understood to mean a linear outer corner produced by means of the angled positioning of two planes (corresponds to the roof ridge of a gabled roof).
In a further embodiment of the invention, the cross-section of the sealing ring is configured to be hexagonal, wherein the cross-section is formed from two base sides arranged parallel to one another and angled away outward in the manner of a gabled roof, which sides are connected with one another by way of two outer sides that are shorter as compared with the base sides. Preferably the corners of the cross-section of the sealing ring are configured to be rounded off by way of a radius.
The invention is furthermore based on the task of making available a sealing ring for a pipe connection of the aforementioned type, which connection can be produced with minimized effort and in which twisting or eversion of the sealing ring is prevented. According to the invention, this task is accomplished by means of the characteristics of the characterizing part of claim 7.
In an embodiment of the invention, the cross-section is configured to be pentagonal or hexagonal. Preferably the cross-section is configured to be hexagonal, wherein the cross-section is formed from two base sides arranged parallel to one another and angled away outward in the manner of a gabled roof, which sides are connected with one another by way of two outer sides that are shorter as compared with the base sides. Preferably the corners of the cross-section of the sealing ring are configured to be rounded off by way of a radius.
Other further developments and embodiments of the invention are indicated in the remaining dependent claims. An exemplary embodiment of the invention is shown in the drawings and will be described in detail below. The figures show:
The pipe connection 1 selected as the exemplary embodiment essentially consists of a connection body 2 that holds a pipe 4 and onto which a nut 3 is screwed, wherein a sealing ring 5 is arranged between pipe 4 and connection body 2.
The connection body 2 is shown in part in
The nut 3 is screwed onto the outside thread 21 of the connection body 2; for this purpose, the nut is provided with an inside thread 31. The nut 3 has a conical bore 32 that is configured to widen in the direction of the connection body 2. The conical bore 32 of the nut 3 is followed by a passage bore 33 through which the pipe 4 is passed.
A formed part 41 is formed into the end-side section of the pipe 4, the outside diameter of which essentially corresponds to the inside diameter of the cylindrical bore 24 of the connection body 2. The formed part 41 has a first clamping surface 42 that is set essentially orthogonal to the center rotational axis of the pipe 4 and lies against the end face 22 of the connection body 2. The first clamping surface 42 makes a transition into a connection surface 44, which narrows conically in the direction of the cylindrical end section 45.
The second clamping surface 43, which lies opposite the first clamping surface 42, is configured to be conical, wherein the progression of this second clamping surface 43 essentially corresponds to the conical bore 32 of the nut 3, against which the formed part 41 lies with its second clamping surface 43.
By means of the conical bore 23 of the connection body 2 and the end-side section of the pipe 4, with its first clamping surface 4 and its connection surface 45, a ring-shaped holding space 6 is delimited, having an essentially square-shaped cross-section for holding the sealing ring 5, which is pushed onto the pipe 4.
In
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Number | Date | Country | Kind |
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20216821.7 | Dec 2020 | EP | regional |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2021/082420 | 11/22/2021 | WO |