NL2000066C2 - Pipe fitting. - Google Patents

Description

NL 46983-YR / pb Pipe fitting

The invention relates to a tube fitting, such as that described in the preamble of claim 1.

Pipe fittings are known from the state of the art for a releasable connection of plastic pipes with fittings or adapters, wherein the pipe to be connected to an adapter is surrounded by a cutting ring which cooperates with a ring groove in the adapter, and which, by means of a union nut comprising the tube and the tube ring when screwing onto the adapter, penetrates into the tube wall with a circumferential cutting edge and fixes the tube on the adapter and secures it against an outward force.

It is an object of the invention to provide a tube adapter for a non-releasable tube connection with a fixture that ensures a tight connection of the tube to the adapter, resistant to extension, with simple mounting.

This object of the invention is achieved by the features shown in the characterizing part of claim 1. The surprising advantage here is that the connecting tube with the flange ring in the receiving chamber between the tube adapter and the ring adapter is reliably tensioned and sets a high retaining force against a possible extending force which can occur in a pipe chain.

An embodiment according to claim 2 is possible here, because an accurate axial force transfer from an outgoing force to the ring adapter is thereby achieved.

An embodiment according to claim 3 is advantageous here because it permits simple tool geometry for the manufacturing tools, in particular injection molding tools.

However, an embodiment according to claim 4 is also advantageous, because it allows saving of any stop sleeves to prevent a retraction of the connecting pipe in the event of an outward force.

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However, an embodiment according to claim 5 is also advantageous, whereby a durable connection is achieved with high strength.

According to the advantageous embodiments described in claims 6 and 7, the contact surface in the connection region of the tube adapter with the ring adapter is increased and thereby a large holding force is achieved.

Due to the advantageous embodiment described in claim 8, accurate pre-positioning is achieved of the connecting tube in the ring adapter when performing the connecting operations.

An embodiment according to claim 9 is possible here, because it reliably prevents the connecting pipe from being pulled out.

An embodiment according to claim 10 is also advantageous, as a result of which an axial play is achieved, whereby a close cooperation of the connecting surfaces of the tube adapter and the ring adapter is achieved when the connection is made.

However, an embodiment according to claim 11 is also advantageous, whereby reliable sealing is achieved in both a radial and axial direction with a sealing ring.

An embodiment according to claim 12 is thereby also possible, whereby standard sealing rings can be used.

Furthermore, an embodiment according to claim 13 is advantageous, whereby assembly is simplified by the assured pre-positioning of the sealing ring and assembly errors are effectively prevented.

Due to the advantageous embodiment characterized by claim 14, bending forces acting on the connecting pipe are also substantially reduced as regards the effects on the connection of pipe adapter to ring adapter.

Due to the advantageous embodiments as characterized in claims 15 to 17, the installation dimensions, that is to say a total length of the tube fitting, are exactly 3 defined.

Due to the advantageous embodiment described in claim 18, standard tools can be used for mounting the tube fixture.

The embodiments described in claims 19 to 21 ensure universal application of the tube fixture for different types of installation applications.

An embodiment is also possible according to claim 22, whereby additional protection against bending forces is achieved in the connecting pipe and wherein the requirements existing in such an embodiment, in particular when a pipe connection or pipe connection is used in the area of gas pipes, with high reliability are met. An embodiment according to claim 23 is also advantageous because a reliable press fit is thereby achieved for the sealing ring in the receiving chamber.

The advantageous embodiments characterized by claims 24 and 25 effectively prevent retraction of the connecting tube and thereby the risk of leakage of the tube fitting. With this, it is also possible to dispense with the use of a stop sleeve in the connecting pipe.

The embodiment characterized in claim 26 allows economical fabrication, such as that is particularly suitable for fabrication in large series.

An embodiment according to claim 2.7 is thereby possible, whereby a material that has already proven itself can be used, with reliable welding properties.

Finally, an embodiment is also advantageous according to claim 28, whereby a direct connection, according to the embodiment of the invention, is achieved directly to a luminaire prepared for such an installation without the further use of screw adapters, flanges and the like.

The invention is explained in more detail below with reference to the examples of embodiments shown in the drawings.

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It is shown:

Figure 1 shows a tube fitting according to the invention in side view and section;

Figure 2 shows a detailed view of the tube fitting according to Figure 1;

Figure 3 shows another embodiment of the tube fitting on a housing;

Figure 4 shows a further embodiment of the tube fitting on a housing; Figure 5 shows another embodiment of the tube assembly;

Figure 6 shows a detail view of a connection area of the tube fitting;

Figure 7 shows another embodiment of the tube assembly in section;

Figure 8 shows another embodiment of the tube fitting in section.

As an introduction, it is to be emphasized that in the various described embodiments the same parts are provided with the same reference numbers and the same part designations respectively, the disclosures comprising throughout the description being useful on the same parts with the same reference numerals or the same part designations transferred. Also, the position indications selected in the description, such as, for example, above, below, laterally, etc., are related to the directly described and also shown figure and are thereby transferable to the new position in the event of a change of position. Furthermore, individual features or combinations of features from the various examples of embodiments shown and described may in themselves represent independent invention solutions or solutions according to the invention.

Figures 1 and 2 show a pipe fitting 1 in the example of a connection of a pipeline 2, in particular of a plastic pipe 3 to a fitting 4. ! for example fitting, housing, center drill clamp, etc. The tube fixture 1 consists of a tube adapter 5 that can be connected to the fixture 4, a ring adapter 5 that can be connected to the tube adapter 5, and one in through-hole holes 7, 8 of the tube adapter 5 and the ring adapter 6, connecting tube 9 provided, and at least one sealing ring 11 arranged in connection area 10, for example O-ring 12.

The tube adapter is a hollow cylindrical shaped part which, according to the shown variant of the embodiment, is provided with an outer thread 14 in an end region 13. A flange 16 is formed in an opposite end region 15. The flange 16 is provided on an annular end face 17 facing the ring adapter 6 and provided with an annular circumferentially extending, cross-sectional, trapezoidal brass 18 projecting therefrom.

The annular body 6 is also provided with a flange 19, which is opposite to the flange 16. A groove 21 is arranged in an annular end face 15, which groove receives the tongue 18 of the tube adapter 5.

This embodiment guarantees a very strong and centered connection between the tube adapter 5 and the ring adapter 6.

The through-bores 7, 8 of the tube adapters 5 and ring-adapter 6 have the same inner diameter 22 and this essentially corresponds to an outer diameter 23 of the connecting tube 9 received in the through-bores 7, 8, which inserts with an insertion depth 24 into the tube adapter 5, and 25 projects beyond the ring adapter 6 at an opposite end region 25 and forms with this end region 25 a so-called end 26 for the connection of pipeline 2. The insertion depth 24 is limited by a stop means 28 which protrudes within the inner diameter 22 of the tube adapter 5 in the direction of a central axis 27 in the longitudinal direction, for example arranged on the inner circumference and uniformly distributed protrusions. However, it is also possible to make the stop means 28 ring-shaped, wherein preferably a protrusion 29 protruding from the inner diameter 22 in the direction of the central axis 27 in the longitudinal direction is not greater than a wall thickness 30 of the connecting pipe 9.

For protection against pulling out the connecting tube 9, it is provided with a circumferential flange ring in the area of the ring adapter 6 and the ring adapter 6 is provided with an annular receiving chamber 32 for receiving the flange ring 31 in the through bore 8. A inner diameter 33 approximately corresponds to an outer diameter 34 of the flange ring 31. A height 35 of the flange ring 31 is approximately equal to or greater than the wall thickness 30 of the connecting tube 9. The flange ring 31 is supported with an annular stop surface. 36 against an abutment surface 37 of the receiving chamber 32 opposite it, wherein a surface 38 according to this embodiment formed by the abutment surfaces 36, 37 is directed perpendicularly to the central axis 27 in the longitudinal direction.

As a result, any withdrawing force acting on the tube fixture 1 is absorbed by the tube fixture 1 according to arrow 69.

On the circumference side, the sealing ring 11 is provided on the flange ring 31, for which a ring-shaped groove 40 for the sealing ring 11 is provided by a step in the through bore 8 of the annular body 6.

A cross-section of the groove 40 is slightly smaller than a maximum

All dimensions in section of the sealing ring 11, so that a! press fit is achieved in the groove 40 for obtaining a reliable sealing action. "

The connection of the tube adapter 5 with the ring adapter 25b 6, in which the connection area 10 with the brass 8 and the! groove 21 is preferably carried out by chip welding. Naturally, gluing is also possible.

As can now be seen from Figure 1, provision is made for connecting the end 26 of the connecting pipe 9 to the pipe conduit 2 by butt welding, in particular by mirror welding known from the prior art for this application.

As can still be seen from the figure in dotted line, it is of course also possible to arrange a flange 41 in the end region 13 of the tube adapter 5 instead of the outer thread 14 for connection to the fixture 4, for example a valve housing, a house of a slide, center drill clamp, etc.

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A similar method of attachment to the tube fixture 1, instead of a flange 41 comprising the cylindrical end region 13, would be that a plurality of attachment lips distributed over the circumference were provided.

The last described embodiments with the flange 41 or with the mounting lips, however, are more complex in view of the implementation of the tools for injection molding the pipe adapter 5 of plastic material.

The construction of the connection area 10 with the brass 18 on the tube adapter 5 and the groove 21 on the ring adapter 6 is one of several other possibilities for increasing the contact surfaces between these for obtaining a high strength and at the same time the parts to center with respect to each other, i.e. to achieve precise alignment. Of course, other embodiments of the contact surfaces are also conceivable. For "friction welding" as the type of connection, however, a rotationally symmetrical design is necessary, because such a method requires both a pressing force and also a relative movement between the connecting surfaces, and this in the present case by a mutual rotation of the parts relative to from each other.

Figure 3 shows yet another embodiment of the tube fitting 1. According to this embodiment, the tube fitting 5 is formed in one piece on a housing 42, for example a lower valve housing 43 of a closing fitting. Such an embodiment enables the direct connection of pipeline 2 by means of connecting tube 9 and anchoring thereof between the tube adapter 5 formed on the housing 42 and ring adapter 6, with the flange ring 31 positioned in the receiving chamber 32 of the ring adapter 6. This embodiment of the connection area 10 to the receiving chamber 32 for the flange ring 31 and also the location of the sealing ring 11 corresponds to the examples of embodiments already described in the previous figures.

Figure 4, for example, shows another embodiment of pipe fitting 1, wherein the pipe adapter 5 is directly formed on a housing part 34 of a center drill clamp 45.

Such an embodiment is particularly suitable for connecting the pipeline 2 directly to the supply pipe 46 by mounting the housing part 44, an opening being created in the pipe wall. The further embodiment of the ring adapter 6, connecting pipe 9 with the flange ring and sealing ring corresponds to the examples already described above.

Figure 5 shows another embodiment of pipe fitting 1. According to this exemplary embodiment, the tube adapter 5 has an inner thread 47 in its end region 15 for connection to a fixture. In order to limit the insertion depth 24 for the connecting pipe 9, according to this example of an embodiment, the stop means 28 is designed as a stop ring 48.

The design of the connection area 10 between the tube adapter 5 and the ring adapter 6, while retaining the connection tube 9 by means of flange ring 31 and the sealing ring 11 surrounding the flange ring 31, corresponds to the above-described exemplary embodiments.

Furthermore, this shows an example of an embodiment of a possible weld connection between the connecting tube 9 and the pipeline 2, by means of a welding sleeve 49 which comprises the end 26 and the pipeline 2 in the region of an impact position 50. The welding sleeve 49 is provided with a heating coil 51 that can handle electric current. Due to the temperature load that can be achieved with it, fusion takes place while a welding layer 52 is formed between the inner wall 30 of the welding sleeve 49 and the outer wall of the connecting pipe 9 and the end 26 of the pipeline, respectively. 2. It can further be seen from Figure 5 that a support sleeve 53, in particular a thin-walled metal sleeve, is inserted into the connecting tube 9, which overlap the connecting region 10. Hereby 35 a radial retraction of the connecting tube 9 in the direction of the central axis in the longitudinal axis 27 is effectively prevented when an outward force occurs, according to arrow 54, so that even with higher outward forces

J

9 according to arrow 54 - the flange ring 31 does not fall out of engagement with the receiving chamber 32 in the ring adapter 6.

In Fig. 6, another embodiment of the tube fixture 1 is used, which relates to the connection area 10 between the tube adapter 5 and the ring adapter 6.

In particular, this further development relates to the design of the flange ring 31 of the connecting tube 9 as well as the receiving chamber 32 and the placement of the sealing ring 11. According to this embodiment, the stop 10 surfaces 36, 37 on the flange ring 31 and the receiving chamber 32 in the form of a cone surface of a blunt cone, concentric with the central axis 27 in the longitudinal direction, with on the central axis 27 in the longitudinal direction intersection point 55 of the imaginary jacket line which with respect to the flange ring 31, opposite the working direction of the exiting force, according to arrow 54, has been displaced. With the occurrence of the outgoing force, according to arrow 54, a force component acting in the radial direction, according to arrow 56, is obtained on the flange ring 31, as a result of which a retraction of the connecting tube 9 in the direction of the central axis 27 in the longitudinal direction is effective. is prevented. A vertex angle 57 of the intended cone is preferably about 150 degrees to 170 degrees.

As can further be seen from figure 6, the flange ring 31 is provided on its circumference with a support groove 58 formed by an annular recess, for positioning the O-ring 12. The ring adapter 6 is provided with a to the O-ring facing sealing surface 59, which roughly corresponds to the cross-section of the O-ring 12. The dimensions must, however, be determined in order to obtain a press fit of the O-ring 12, in order to achieve a high sealing effect of the O-ring 12.

Figure 7 shows another embodiment of the tube fixture 1 with the connection area 10 between the tube adapter 5 and the connection tube 9 with the tube adapter 5 by means of the sealing ring 11 sealingly connecting ring adapter 6. The connection of the tube adapter 5 with the ring adapter 6 preferably takes place, as already described in the previous figures, by frictional weld connection 10 of the brass 18 of the flange 16 of the tube adapter 5 with the groove 19 of the ring adapter 6. The connecting tube 9 is held in the ring adapter 6 by means of the flange ring 31 in the receiving chamber 32, and, as already described in the previous figure 5, via opposite cone-shaped surfaces 36, 37 running in the radial direction against a retraction of the tube wall, in the direction of the central axis 27, the longitudinal direction, guaranteed. In the receiving chamber 32, the sealing ring 11 is tensioned against the opposite annular end faces 60, 61 of the flange ring 31 and the tube adapter 5, the end faces 61 of the tube adapter 5 being provided with an outer side in the direction of the end faces 60 of the flange ring 31 projecting tension ring 62 which exerts a pre-stress 15 on the sealing ring 11 for a reliable sealing of the connecting position 10.

Figure 8 shows another embodiment of the flange ring 31 of the connecting tube 9 of the tube assembly 1, in order to achieve a supporting action for retracting the tube wall in the direction of the central axis 27 in the longitudinal direction, wherein the connection position 10 between the tube adapter 5 and the ring adapter 6 as well as the receiving chamber 31 and placement of a sealing ring 11 corresponds to the embodiment of the previously described figure.

In this embodiment of a support device 63 for achieving a support effect for the pipe wall of a connecting pipe 9, the flange ring 31 is provided with an end face 64 placed against the sealing ring 11 and provided with a circumferential undercut groove 65. The ring adapter 6 has a support ring 66 cooperating with the undercut groove 65 and projecting towards the connection of the tube adapter 5 with the ring adapter 6 into the undercut groove 65. A retraction of the tube wall of the connecting tube 9 - according to arrow 67 - is therefore effectively prevented even with higher tensile loads extending in the axis direction between the tube adapter 5 and the connecting tube 9.

It is also stated that plastic is suitable as material for the elements of the tube fixture 1 and that preferably polyethylene can be used for the connecting tube 9. Such materials are easy to process and exhibit high strength and have a wide temperature range. bid deployable and insensitive to various 5 substances.

The examples of embodiments show possible embodiments of tube fitting 1, it being noted at this position that the invention is not limited to the specially shown variants of embodiments 10 thereof, but much more also that various combinations of the individual embodiments are mutually possible and this variation possibility on the basis of the teaching with regard to technical acting by the present invention lies in the possibilities of the skilled person working in this technical field. Thus, there are also numerous conceivable variants of embodiments that are possible through combinations of the individual details of the illustrated and described embodiments, which are also included in the scope of protection.

For the sake of good order, it is to be noted finally that for a better understanding of the structure of the tube fixture 1, this and its components were in part not shown to scale and / or enlarged and / or reduced.

The description underlying the individual solutions according to the invention is apparent from the description.

Above all, the individual in Figures 1, 2; 3; 4; 5; 6; 7,8 are the subject of individual solutions according to the invention. The tasks and solutions according to the invention relating to this are apparent from the detailed descriptions of these figures.

List of reference numbers 1 pipe fitting 35 2 pipe 3 plastic pipe 4 fitting 5 pipe adapter 12 6 ring adapter 7 through bore 8 through bore 9 connecting pipe 5 10 connecting area 11 sealing ring 12 O-ring 13 end area 14 outer thread 10 15 end area 16 brass 19 flange 15 20 end face 21 groove 22 inner diameter 23 outer diameter 24 insertion depth 20 25 end region 26 end 27 center axis in the longitudinal direction 28 abutment means 29 protrusion 25 wall thickness 31 flange 32 receiving chamber 33 inner diameter 34 outer diameter 30 35 height 36 abutment surface 37 abutment surface 38 plane 39 arrow 35 40 groove 41 flange 42 housing 43 valve housing j 13 44 housing part 45 center drill clamp 46 supply pipe 47 internal thread 5 48 stop ring 49 welding sleeve 50 impact position 51 heating coil 52 welding layer 10 53 support sleeve 54 arrow 55 cutting point 56 arrow 57 top angle 15 58 support groove 59 sealing surface 60 end surface 61 end surface 62 tension ring 20 63 support device 64 ein The surface 65 undercut groove 66 support ring

Claims (27)

A pipe fitting (1) for connecting a pipe (2) to a fitting (4), for example pipe socket, valve or shut-off housing, fitting, etc., with a pipe adapter (5) and one with the pipe adapter (5) connectable ring adapter (6) and with a connecting tube (9) extending through through-bores (7, 8) of the tube adapter (5) and the ring adapter (6), outside the ring adapter (6) with an end (26) outer circumference of the connecting tube (9) in a connecting area (10) of the tube adapter (5) with the ring adapter (6) projecting flange ring (31) and with at least one sealing ring arranged on the outer circumference of the flange ring (31) 11, characterized in that an annular receiving chamber (32) accommodating the flange ring (31) and the sealing ring (11) and a flange ring (31) is arranged in the tube adapter (5) and / or in the ring adapter (6) ) of the connecting tube (9) facing annular stop surface (37) of the receiving chamber (26) with one of the facing annular stops bearing surfaces (36) of the flange ring (31) form a pull-out stop for the connecting tube (9) and the connection is non-releasable. Pipe fitting (1) according to claim 1, characterized in that the stop surfaces (36, 37) run in a plane (38) that is perpendicular to a longitudinal central axis (27). 3. Pipe fixture (1) according to claim 1, characterized in that the stop surfaces (36, 37) are designed in the form of cone surface surfaces of a blunt cone with a top angle (57) between 150 degrees and 175 degrees. 4. Pipe fitting (1) according to claim 1, characterized in that the tube adapter (5) is connected to the ring adapter (6) by friction welding. Tube fitting (1) according to claim 1, characterized in that the tube adapter (5) and the ring adapter (6) are flanged in the connecting area (10). 6. Pipe fitting (1) according to claim 5, characterized in that opposite end faces (20) form an annular circumferential brass and groove device. 2000066% I 15 A tube fitting (1) according to claim 1, characterized in that the receiving chamber (32) is arranged in the ring adapter (6). Tube fitting (1) according to claim 1, characterized in that a height (35) of the flange ring (31) protruding outside the outer circumference of the connecting tube (9) is equal to or greater than a wall thickness (30) of the connecting tube (9). Pipe fitting (1) according to claim 1 or 7, characterized in that a width of the receiving chamber (32) is little greater than a width of the flange ring. The tube fitting (1) according to claim 1, characterized in that the sealing ring (11) is arranged on the connecting tube (9) and the flange ring (31) is circumferential. Pipe fitting (1) according to claim 10, characterized in that the sealing ring (11) is formed by an O-ring (12). 12. Pipe fitting (1) according to claim 10 or 11, characterized in that the flange ring (31) is provided with a support groove (58) for the sealing ring (11) on a circumference, comprising this ring. The tube fitting (1) according to claim 1, characterized in that the connecting tube (9) is in the through bore! (7) protrudes from the tube adapter (5). Tube fitting (1) according to claim 13, characterized in that an insertion depth (24) of the connecting tube (9) into the tube adapter (5) through an inner diameter (22) of the through-hole (7) of the tube adapter (59) in the direction of the stop means (28) protruding within the central axis 30 (27) is limited in the longitudinal direction. Tube fitting (1) according to claim 14, characterized in that the stop means (28) is formed by a stop ring (48). 16. Pipe fitting (1) according to claim 1, characterized in that engagement surfaces for a tool are formed on an outer circumference of the pipe adapter (5). Tube fitting (1) according to claim 16, characterized in that a region of the outer circumference of the tube adapter (5) is in the form of a polygon. Pipe fitting (1) according to claim 1, characterized in that an end region (13) of the pipe adapter (5) is provided with an outer thread (14). Pipe fitting (1) according to claim 1, characterized in that the end region (13) of the pipe adapter (5) is provided with an internal thread. 20. Pipe fitting (1) according to claim 1, characterized in that the pipe adapter (5) in the end region (13) is provided with a flange (41). A tube fitting (1) according to claim 1, characterized in that a support sleeve (53) is arranged in a frictional manner in the connecting tube (9). Tube fitting according to one of the preceding claims, characterized in that the tube adapter (5) is provided on an end face (61) facing the receiving chamber (32) of the ring adapter (6) with an outside surface of this protruding, annular circumferential tension ring (62). 23. Pipe fitting according to claim 1, characterized in that between the flange ring (31) of the connecting pipe (9) and the ring adapter (6) a support device (63) for a pipe wall of the connecting wall (9) is applied. 24. Pipe fitting as claimed in claim 23, characterized in that the support device (63) is formed by an undercut groove (65) in an end surface (64) of the flange ring (31) placed against the receiving chamber (32) and the undercut groove (65) cooperating support ring (66) of the ring adapter (6). 25. Tube fitting (1) according to claim 1, characterized in that the tube adapter (5) and the connecting tube (9) and the ring adapter (6) are preferably made of plastic. The tube fitting (1) according to claim 25, characterized in that the connecting tube (9) is preferably made of polyethylene. A tube fitting (1) according to claim 1, characterized in that the tube adapter is integrally formed on the fitting, for example a valve housing, center bracket, etc. 2000066 I II