Abstract
The invention relates to a multipart pipe joint (10) having a centre piece (16) on which joint parts (18, 20) are received which are pivotable relative thereto and which are rotationally fixed to the centre piece (16) at articulation points (22, 24). The articulation points (22, 24) of the joint parts (18, 20) on the centre piece (16) also represent articulation points (22, 24) for transmission elements (42) which extend axially along an inner wall (34) of the centre piece (16). The articulation points (22, 24) forming articulation axes are arranged in an axial offset (25) to each other. Furthermore, the invention relates to the use of the multipart pipe joint (10) in an aircraft.
Claims
1. Multipart pipe joint with a centre piece on which joint parts are received which are adjustable relative to the centre piece and which are rotationally fixedly connected to the centre piece at articulation points, characterised in that the articulation points of the joint parts on the centre piece simultaneously constitute articulation points for transmission elements which extend axially along an inner wall of the centre piece, the articulation points forming articulation axes being arranged in an axial offset (25) relative to one another.
2. Multipart pipe joint according to claim 1, characterised in that articulation points for the transmission elements are arranged offset from one another in an offset by an offset angle with respect to a circumference of the centre piece.
3. Multipart pipe joint according to claim 2, characterised in that in each case a pair of transmission elements offset by 180° relative to one another are rotationally fixedly connected to the centre piece and the first joint part at first articulation points.
4. Multipart pipe joint according to claim 2, characterised in that in each case a pair of transmission elements arranged offset by 180° relative to one another are rotationally fixedly connected to the centre piece and the second joint part at second articulation points.
5. Multipart pipe joint according to claim 2, characterised in that the transmission elements are substantially tab-shaped and pivotable on the inner wall of the centre piece.
6. Multipart pipe joint according to claim 1, characterised in that the joint parts each have a recess on their end faces facing away from the pipe ends.
7. Multipart pipe joint according to claim 6, characterised in that the recesses are each designed as a rounded portion.
8. Multipart pipe joint according to claim 1, characterised in that the centre piece has a circumferential crease formed centrally in its pipe wall, which performs a wear-reducing guide function with respect to a bellows and a load-bearing function with respect to torsion of the centre piece.
9. Multipart pipe joint according to claim 1, characterised in that the joint parts each have a diameter increase on their end faces facing the pipe ends, which respectively constitute mounting surfaces for receiving a bellows covering the multipart pipe joint.
10. Multipart pipe joint according to claim 3, characterised in that the first joint part is pivotable with respect to the centre piece and the first articulation points arranged at an offset of 180° to one another.
11. Multipart pipe joint according to claim 4, characterised in that the second joint part is pivotable with respect to the centre piece about the second articulation points arranged in a 180° offset.
12. Multipart pipe joint according to claim 1, characterised in that, with maximum permissible angular compensation, a minimum gap width 1 in the axial direction between the end face of the first pipe end and an end face of the centre piece opposite thereto is 3 mm, preferably 1 mm.
13. Multipart pipe joint according to claim 1, characterised in that, with maximum permissible angular compensation, a minimum gap width 2 in the radial direction between the first joint part and an outer wall of the centre piece is less than 1.5 mm, preferably a few tenths of a millimetre, most preferably 0.2 mm.
14. Multipart pipe joint according to claim 1, characterised in that in the region of the articulation points of the transmission element between an outer wall of the centre piece and an inner wall of the first and second joint parts there is arranged a ring which on the one hand brings about a spacing between the centre piece and the joint parts and on the other hand serves as a reinforcing element with respect to surface pressures in the region of the articulation points.
15. In an air supply system for aircraft for starting the engines and/or for supplying the passenger cabin, comprising a multipart pipe joint, the improvement wherein said multipart pipe joint is a multipart pipe joint in accordance with claim 1.
Description
BRIEF DESCRIPTION OF THE DRAWING
[0028] With reference to the drawing, the invention is described in more detail below. It is shown:
[0029] FIG. 1 a perspective view of the multipart pipe joint proposed according to the invention in an elongated embodiment,
[0030] FIG. 2 a longitudinal section through the multipart pipe joint proposed according to the invention in the extended position as shown in perspective in FIG. 1,
[0031] FIG. 3 the multipart pipe joint proposed according to the invention in a first deflected position,
[0032] FIG. 4 the multipart pipe joint proposed according to the invention in a second version in a second position,
[0033] FIG. 5 a longitudinal section through the multipart pipe joint in the second deflected position according to FIG. 4,
[0034] FIG. 6 a drawing of an individual part of a swivelling joint part with articulation points offset by 45° to each other,
[0035] FIG. 6.1 a perspective view of a transmission element in the form of a bottle, and
[0036] FIG. 6.2 an assembly drawing of the swivelling joint part with transmission elements in the form of tabs mounted on it.
EMBODIMENT VARIANTS
[0037] FIG. 1 shows the multipart pipe joint 10 according to the invention in a perspective view in an extended position.
[0038] A multipart pipe joint 10 shown in the perspective view according to FIG. 1 comprises a centre piece 16. A first joint part 18 and a second joint part 20 are movably received on the centre piece 16. The first joint part 18 terminates in a first pipe end 12, while the second joint part 20 terminates in the second pipe end 14. The first joint part 18 is movably attached to the centre piece 16 at first articulation points 22, which form a joint axis. A further first articulation point 22 is located opposite the first articulation point 22 shown in FIG. 1, offset by 180°, and is not shown in FIG. 1.
[0039] The second joint part 20 is hinged to the centre piece 16 at second articulation points 24, which form a further joint axis, and ends in the second pipe end 14. Opposite the second articulation point 24, which is shown in FIG. 1, is a further second articulation point 24, which is not shown in FIG. 1 and is offset by 180° from the first.
[0040] The perspective view according to FIG. 1 shows that an offset 26 is formed between the first articulation point 22 and the second articulation point 24, which in this embodiment is substantially 45°. Instead of the offset 26 shown in FIG. 1, which is 45°, another angle can also be selected as offset angle 28.
[0041] A circumferential crease 30 is located centrally on the centre piece 16 in its pipe wall. Reference sign 32 designates the pipe cross-section, which is bounded by an inner wall 34 of the centre piece 16, the first joint part 18 and the second joint part 20.
[0042] The pivotable joint parts 18, 20 arranged on both sides of the circumferential crease 30 formed centrally in the wall of the centre piece 16 each have a first recess 36 and a second recess 38 on their side facing the circumferential crease 30. Advantageously, the first recess 36 and the second recess 38 are rounded portions 40.
[0043] FIG. 2 shows a longitudinal section through the multipart pipe joint 10 proposed in accordance with the invention, shown in its stretched position in FIG. 1.
[0044] FIG. 2 shows that tab-shaped transmission elements 42 run along the inner wall 34. These are arranged at first articulation points 22 and at second articulation points 24 on the inside of the inner wall 34 of the centre piece 16. The tab-shaped transmission elements 42 are pivotably mounted on cams 44, the cams 44 being parts of the first articulation points 22 and the second articulation points 24 respectively. As already mentioned in connection with FIG. 1, the first articulation points 22 and the second articulation points 24 are offset from each other by the offset angle 28 of, for example, 45°. FIG. 2 further shows that the multipart pipe joint 10 is enclosed by a bellows 56, which is shown here in sectional view. The bellows 56 has shoulders at each of its ends, which are executed in a diameter increase 54. The diameter increase 54 refers to the distance between the outer wall 48 of a circumference 50 and the inner side of the bellows 56, which is preferably designed as a bellows. In the centre, the bellows 56 is supported by the circumferential crease 30 formed centrally in the wall of the centre piece 16. In the sectional view according to FIG. 2, it is shown that the transmission element 42 extends in its longitudinal extension 52 parallel to the inner wall 34 of the centre piece 16. The longitudinal extension 52 of the transmission elements 42 corresponds to the length of the centre piece 16. The edges thereof adjoin the inner sides of the first joint part 18 and the second joint part 20, respectively, before they are joined by the first pipe ends 12 and the second pipe ends 14, respectively.
[0045] The circumferential crease 30 formed in the wall of the centre piece 16 supports the bellows 56 over its large radius in a wear-reducing manner when the angular position of the joint parts 18, 20 changes dynamically and thus avoids wear-generating contact of the bellows 56 with protruding elements of the articulation axes, in particular a disc 46 on the outside of the first and second joint parts 18, 20. The circumferential crease 30 thus has a guide function. Furthermore, it should be noted that the pipe cross-section 32 of the centre piece 16 is twisted due to an internal pipe pressure prevailing therein, so that the multipart pipe joint 10 is loaded with tensile forces. Due to the distance between the articulation axes, which are formed by the first articulation points 22 and the two second articulation points 24, the tensile forces are significantly reduced, as the force flow in the cross-section of the centre piece 16 no longer has to be deflected by 90°, but only by 45°. The torsional stress is thus counteracted by the circumferential crease 30 in conjunction with the inner plates, i.e. the transmission elements 42 as a closed cross-section at the four positions of load application, i.e. at the first two articulation points 22 and the second two articulation points 24 via the articulation axes. The circumferential crease 30 thus assumes a load-bearing function.
[0046] The offset angle 28 of the offset 26 shown in FIG. 2 is 45°. This offset 26 is only shown as an example. Instead of the offset 26 of 45° shown in FIG. 2, other angles are also possible. Furthermore, it can be seen from the sectional view according to FIG. 2 that a ring 60 is accommodated on the cams 44—here, for example, at the two opposing second articulation points 24—next to the disc 46. The ring 60 ensures a distance between the moving joint parts 18, 20 and the stationary centre piece 16, whereby a mobility of these components is only made possible by the distance. Without the ring 60 and the minimum distance defined by it, the pivoting joint parts 18, 20 would contact each other and rub or even deform in angular position. The ring 60 can also be made of a flexible material such as PTFE, be inserted during assembly and thereby adapt to the curvature of the pipe diameter by itself and serve to inhibit wear. If, on the other hand, the ring 60 is made of metal, it is adapted to the curvature of the pivoting joint parts 18, 20 and welded before assembly and thus, as an additional reinforcing element, reduces the surface pressures in the area of the articulation axes of the first articulation points 22 and the second articulation points 24, respectively, which are opposite each other and offset by 180°.
[0047] The perspective view according to FIG. 3 shows a first deflection situation of the multipart pipe joint 10.
[0048] FIG. 3 shows that in this perspective view a centre axis 62 of the first joint part 18 has an axial offset 66 relative to a centre axis 64 of the second joint part 20. In the representation according to FIG. 3, the axial offset 66 is approx. 7 mm, whereby the two joint parts 18, 20 are pivoted by 7° with respect to the centre piece 16, at an angle of 45° in each case between the plane of the two centre axes 62 and 64, respectively, which are at a maximum angle 70 of 10° to one another, and the articulation axes which are given by the two first articulation points 22 and the two second articulation points 24. In the illustration according to FIG. 4, this axis offset 66 is reduced to 0 mm as soon as the plane of the pipe axes coincides with one of the articulation axes, i.e. either the axis running through the first two articulation points 22 or through the second two articulation points 24. (Illustration in FIG. 4)
[0049] The axis offset 66 can be influenced by a predetermined rotational position in the pipe system corresponding to the expected deflection planes of the multipart pipe joint 10 under operating conditions. If this rotational position, i.e. the installation position, is not deliberately specified, the illustration according to FIG. 3 describes the maximum possible axial offset 66 of the two pipe ends 12, 14 of the two joint parts 18, 20. The multipart pipe joint 10 must be designed to be able to compensate for the maximum possible axial offset 66.
[0050] The axial offset 66 between the centre axis 62 and the centre axis 64 is 7.3 mm in the representation according to FIG. 3. The perspective view according to FIG. 3 also shows that the visible first and second articulation points 22, 24 are arranged at an offset angle 28, which has an offset amount of 45°. The opposite articulation points to those of the two articulation points 22, 24 shown are offset by 180° from the first and second articulation points 22, 24 shown and are therefore not shown.
[0051] While the first joint part 18 can be moved around the two first articulation points 22 which are offset by 180° to each other, as shown in FIG. 3, the second joint part 20 moves around the two second articulation points 24 which are opposite each other by 180° in the illustration according to FIG. 3. This means that the respective planes of movement of the two joint parts 18 and 20 are oriented offset from each other by 45°. Instead of an offset value of 45°—as shown in FIG. 3—another offset 26 could also be selected, for example 30°, 40°, 50° or even 60°. In all cases, the multipart pipe joint 10 proposed according to the invention is associated with a considerable reduction in the mechanical loads on the components of the multipart pipe joint 10.
[0052] For the sake of completeness, it should be mentioned that in the perspective view according to FIG. 3, which shows the multipart pipe joint 10 in a first deflected position, the tabs representing the transmission elements 42 extend parallel to the inner wall 34 of the centre piece 16 of the multipart pipe joint 10. The transmission elements 42 are attached by the cams 44 to each of the first articulation points 22 and each of the second articulation points 24, respectively, and are arranged to pivot relative to the inner wall 34.
[0053] FIG. 4 shows a second deflection position of the multipart pipe joint 10.
[0054] It can be seen from the illustration in FIG. 4 that in the second deflection position of the components of the multipart pipe joint 10 shown there, a 170° angle is enclosed between the centre axis 62 of the first joint part 18 and the centre axis 64 of the second joint part 20, cf. reference sign 68. The distance 72 of the centre axes 62, 64 is 0 mm, the angle 70 is 10°. Analogous to the illustration according to FIG. 3, which shows the first deflection position of the components of the multipart pipe joint 10, the bellows 56 is also omitted in the illustration according to FIG. 4 for reasons of representability.
[0055] The illustration according to FIG. 5 shows a further section through the multipart pipe joint 10 proposed according to the invention, the deflection position of which according to FIG. 5 is identical to that in FIG. 4.
[0056] FIG. 5 shows that the centre piece 16 has the circumferential crease 30 in its lateral surface, which comprises an inner wall 34. The second joint part 20 is accommodated in the two second articulation points 24 shown in the sectional view according to FIG. 5, which are offset by 180° from one another and are in a stretched, i.e. not angled, position in relation to the centre piece 16 with respect to the centre axis 82 of the centre piece 16. As FIG. 5 shows, cams 44 are formed on the tab-shaped transmission elements 42 at the two opposing second articulation points 24. On the one hand, a ring 60 for reducing friction is accommodated in the cams 44, and on the outside of each of the cams 44 is the disc 46. The tab-shaped transmission elements 42 are designed in the longitudinal extension 52.
[0057] In contrast to the undeflected position of the second joint part 20 with respect to the centre piece 16, the first joint part 18 is in an angled position with respect to the centre piece 16. This is evident from an angle denoting a 10° offset 74 between the centre axis 82 of the centre piece 16 and the centre axis 62 of the first joint part 18. The offset 74 shown in FIG. 5 is 10°. The angled position of the first joint part 18 in relation to the centre piece 16 shown in the sectional view according to FIG. 5 results in a gap width 1, compare position 76, which is 1 mm and which occurs in the deflected position of the first joint part 18 shown in FIG. 5 between the two opposite end faces of the centre piece 16 on the one hand and the deflected first joint part 18 on the other hand. Furthermore, a gap width 2 in the order of a few tenths of a millimetre, preferably 0.2 mm, compare position 78, is established between the outer surface of the first joint part 18 and the outer wall 48 of the centre piece 16. The gap widths 1 and 2 shown in FIG. 5, compare positions 76 and 78, occur when the first joint part 18 is deflected in relation to the stationary centre piece 16, in particular with a maximum permissible angular compensation.
[0058] When the pipe axes of the two joint parts 18, 20 are deflected at an angle to each other, they define a plane. The articulation axes, which are formed by the opposing articulation points 22, 24 and which are rotated through 90° to each other, have an angle of rotation to this plane. There are two extreme positions of rotation of 45°/45° and 0°/90° of the two articulation axes in relation to the plane of the pipe axis and every angle in between. A rotation of 0°/90° results in an axial offset of the pipe axes of 0.0 mm with a maximum angular position 70 of 10° of the pipe axes to each other. At the extreme position of 45°/45°, the axial offset of the pipe axes is 7.3 mm with a maximum angular position 70 of 10° of the pipe axes to each other.
[0059] FIGS. 6, 6.1 and 6.2 show the manufacturing and assembly steps of the centre piece 16 of the multipart pipe joint 10 proposed according to the invention.
[0060] FIG. 6 shows the centre piece 16, on the circumference 50 of which bores 80 are formed opposite one another, which have the receptacles, for example, for the cams 44 of the tab-shaped transmission elements 42. The bores 80 with the cams 44 of the tab-shaped transmission elements 42 received therein represent the two first articulation points 22 opposite each other offset by 180°. On the other side of the circumferential crease 30 running centrally in the centre piece 16 are in an analogous manner offset 26, which can be executed at an offset angle 28 of, for example, 45°. Alternatively, other offset angles 28 can be selected, such as 30°, 40°, 50° or 60°, in order to optimise the force flow lines. In the scheme shown in FIG. 6, the holes 80 are made in the outer wall 48 of the tubular centre piece 16. FIG. 6.1 shows a perspective view of the transmission element 42 which, in its fitted position, fits snugly against the inner wall 34 of the centre piece 16. This comprises the cams 44 at one end, which are fitted into the bore 80 and are secured by the disc 46.
[0061] FIG. 6.2 shows the transmission element 42, the cams 44 of which are pressed into the bores 80 of the centre piece 16. FIG. 6.2 corresponds to the illustration in FIG. 6, according to which the individual bores 80 for receiving the cams 44 of the tab-shaped transmission elements 42 are offset in relation to each other and the offset 26 at the offset angle 28. An articulation axis is formed by the two opposing first articulation points 22; a further articulation axis is formed by the two opposing second articulation points 24. Analogous to the illustration in FIG. 6, the centre piece 16, the circumferential crease 30, extends centrally in the outer wall 48 and serves to support the bellows 56 shown in section in FIG. 2.
[0062] The invention is not limited to the embodiments described herein and the aspects highlighted therein. Rather, within the scope indicated by the claims, a variety of variations are possible which are within the scope of skill in the art
LIST OF REFERENCE SIGNS
[0063] 10 multipart pipe joint
[0064] 12 first pipe end
[0065] 14 second pipe end
[0066] 16 centre piece
[0067] 18 first joint part
[0068] 20 second joint part
[0069] 22 first articulation point
[0070] 24 second articulation point
[0071] 25 axial offset
[0072] 26 offset (45°)
[0073] 28 offset angle
[0074] 30 circumferential crease
[0075] 32 pipe cross-section
[0076] 34 inner wall
[0077] 36 first recess
[0078] 38 second recess
[0079] 40 rounded portion
[0080] 42 transmission element
[0081] 44 cam
[0082] 46 disc
[0083] 48 outer wall
[0084] 50 circumference
[0085] 52 longitudinal extension transmission element
[0086] 54 diameter increase
[0087] 56 bellows
[0088] 60 ring
[0089] 62 central axis of first joint part
[0090] 64 central axis second joint part
[0091] 66 offset of centre axes
[0092] 68 170° angle
[0093] 70 10° angle
[0094] 72 0-distance
[0095] 74 10° offset
[0096] 76 gap width 1 (1.0 mm)
[0097] 78 gap width 2 (0.2 mm)
[0098] 80 bore for cam
[0099] 82 centre axis centre piece
