DE102005026580B3 - Pipe connection has formed pipe and threaded component with inner cone which merges directly into cylindrical inner generated surface which defines through-hole of threaded component - Google Patents

Abstract

The pipe connection (1) has a formed pipe (4), a threaded component (2) with an inner cone (19), and a union nut screwed onto the threaded component. The inner cone of the threaded component merges directly into its cylindrical inner generated surface (29) which defines the through-hole (D) of the threaded component, and the end face of the pipe at least in part extends radially inwards into the cross section of the through-hole of the threaded component.

Description

The Invention relates to a pipe joint with a deformed pipe, a fitting body with an inner cone, a screw on the fitting body union nut with an inner clamping surface, in the operating state of the pipe joint with a pipe end turned away, produced by forming, radially over the outer surface of the tube outward protruding holding surface a retaining bead of the tube cooperates, and with a support ring, which is pushed from the front side of the tube on this and with a pipe end facing conical clamping surface in the Inner cone of the fitting body supported, wherein the retaining bead further with a pipe end facing holding surface with an adapted adapted to the pipe end holding surface of the support ring interacts.

Such a pipe connection is from the EP 1462 702 A2 known. In the fitting body also called (Verschraubungs-) nozzle, it is a standardized in DIN / EN-ISO 8434 so-called 24 ° socket, in which adjoins the inner cone, a cylindrical shell portion having in its diameter relative to the diameter of Through hole of the union is enlarged. The transition between the enlarged cylindrical portion and the adjoining portion in the region of the through hole takes the form of a so-called tubular seat bottom, which forms an aligned perpendicular to the central axis of the fitting body annular surface. The diameter jump in the region of the tubular seat bottom serves to accommodate the end of the deformed tube in the area enlarged in diameter in order to obtain a transition in the region of the inner lateral surfaces of the tube and the screw body, which has only small diameter differences, as far as possible in the operating state of the pipe connection , Preferably even completely free of such diameter jumps.

A Problem of proven in itself and known pipe joint is that this on the so-called 24 ° system is tailored and for use with other types of pipe connection not suitable.

From the EP 1236 945 A2 Furthermore, a pipe joint with a deformed tube is known. In this pipe connection, however, no support ring is pushed onto the pipe end. Rather, located between the end face of the formed tube and the tube seat bottom - also this tube connection is based on the very popular 24 ° -System - a sealing ring, which consists partly of metal and partly of deformable plastic material (soft seal). The assembly process is completed in this system when the end face of the deformed tube end has clamped the metallic portion of the sealing ring between itself and the tube seat bottom. In this state, the soft seal between the metallic part of the sealing ring, the conically adapted end face of the formed tube and the inner shell of the fitting body is squeezed. This previously known pipe connection is only usable in conjunction with the 24 ° system and its tubular seat bottom.

Also tailored to the 24 ° system is the pipe joint used in the DE 195 11 063 A1 is disclosed. In this case, either the 24 ° inner cone is used solely for clamping the tube or, in alternative embodiments, a cylindrical end section is also formed on the tube, which is located in the region of the screw body which is widened in diameter compared to the passage section. This prior art pipe connection has no support ring, the seal is either purely metallic or using a soft seal, which may be arranged in the region of the inner cone of the fitting body, the tubular seat bottom or radially outside of the molded retaining bead.

Furthermore, in the DE 195 20 099 A1 nor a pipe joint described in which a deformed pipe end is designed such that it extends with a cylindrical end portion up to the pipe seat bottom of the 24 ° -Verschraubungskörpers used here again. With a perpendicular to the tube axis aligned front clamping surface of the Halterwulstes the deformed tube abuts the parallel thereto aligned end face of the fitting body. In this way, a chamber is formed in the region of the inner cone of the fitting body in which a soft seal is squeezed in the operating state of the pipe joint. Also, this known pipe connection is only suitable for the 24 ° system with the pipe seat bottom present in the nozzle.

The publication DE 199 58 475 A1 discloses a pipe joint consisting of a deformed pipe, a fitting body, a union nut, a sealing ring and a support ring. The deformed tube is provided with a bead which, together with the conical surface of the union nut, forms a stop surface for an end face of the support ring. The opposite side of the support ring has a radially extending annular surface, which in turn has a stop surface for forms the end portion of the fitting body provided with a cone. The sealing ring is disposed in the space bounded by a portion of the tube, the support ring and the cone of the fitting body. The connection system resulting from this document is suitable for a fitting body with a standardized 24 ° cone.

Also from the patent DE 197 42 917 C1 shows a screw similar to that of the aforementioned publication and is based on the 24 ° system. A pipe provided with a bead is provided with a support ring which forms on one side a stop face for a union nut and on the other side a stop face for a fitting body. On the side facing the union nut of the support ring is equipped with a tapered stop surface against which the equally extending stop surface of the nut is supported in the suit of the nut, thereby overstressing the tube to be prevented in its clamping area. In the area of the 24 ° cone of the fitting body, a soft seal is arranged.

In the high-pressure connection system according to the publication DE 195 41 622 A1 is provided to improve the sealing performance of a pipe joint with a 24 ° connection having receiving body to arrange a first elastomeric sealing element between the end face of a receiving body and a metallic sealing ring. Furthermore, a second elastomeric sealing element between a tube facing the lateral surface of the sealing ring and the outer wall of the tube to be arranged. In this prior art connection system is a cutting ring system, wherein the cutting ring cooperates with the inner cone of the metallic sealing ring.

The patent EP 0 593 325 B1 has a pipe coupling to the object, which is to make sure the attachment of a pipe equipped with a torus in a bore of a part. To screw into the bore a threaded sleeve is mounted on the tube on one side of the annular bead and on the other side of the annular bead a ring which is pressed by tightening the threaded sleeve against a wall of the bore. The ring has on the side facing the bore on a groove which receives a seal. When tightening, the seal is pressed wide, making the tube close in the bore.

To the State of the art count further screw body according to the British Standard BS 5200, which have a 60 ° inner cone. A tubular seat bottom, as he is known from the 24 ° system, exists in the so-called 60 ° system Not. In the 60 ° system, whose main application is the so-called mobile hydraulics for example, no temperature problem such as in systems of the chemical industry, no reshaped Pipe ends but connecting nipple used in the way of a Machining in the range of a 60 ° conical surface a groove for receiving a Soft seal is formed. In general, the connection nipple with a radially pressed union nut or by means of a positive connection causing, in Circumferential direction open wire ring connected to a union nut. typically, closes at the connection nipple to a flexible hose piece.

Of the Invention is based on the object, a pipe joint with a to propose transformed tubes suitable for use in the known 60 ° system suitable.

solution

outgoing from a pipe joint of the type described above, this is Task according to the invention thereby solved, that the inner cone of the fitting body directly in the cylindrical inner lateral surface, which defines the through hole of the fitting body, passes and the face the tube at least partially radially inwardly in the cross section the through hole of the fitting body extends.

With the pipe connection provided by the invention can be now also with the known 60 ° -Grieschraubungskörper a Combine unshaped pipe end. From the 60 ° system so far largely used principle of soft seal is now moved away, since the pipe connection according to the invention in principle also only with the help of acting as a metallic sealing surface tapered front clamping surface of the support ring can cause a seal. However, is also preferred in the pipe connection according to the invention a seal, in particular in the form of an elastically deformable Soft seal available. The pipe connection according to the invention has a support ring because the forming technology training in the 60 ° Innenkonus matching pipe outer contour at least by means of a single upsetting operation without relevant pipe damage and the associated power reduction is not possible.

In particular with large wall thicknesses of the deformed tube or in relation to it at least in its end portion in the cross section of the through hole, ie the smallest cross section of the deformed pipe end is smaller than the passage cross section of the screw connection.

A particularly reliable Sealing of the pipe connection according to the invention let yourself achieve when the support ring a sealing ring, preferably in the form of a soft seal upstream is. Preferably, the sealing ring is in a triangular-shaped in cross section chamber enclosed by an outer surface of the End portion of the tube, a pipe end facing the front end face of the support ring and the inner cone of the fitting body is formed.

in the Meaning a simplified handling of the pipe assembly is provided that the sealing ring with a connecting surface to the front end face of support ring glued or vulcanized on it. It eliminates the need for the support ring and handle the sealing ring as separate parts during assembly have to.

According to one Embodiment of the pipe joint according to the invention is provided that the pipe end has a cylindrical end portion whose outer diameter preferably the outer diameter corresponds to the tube in the undeformed area, creating a safe Fixation of the pushed-on support ring is made possible .. For a the effort involved in the forming process rather low, on the other allows the cylindrical end portion a secure fixation of pushed on support ring. The formation of a cylindrical end portion is particularly useful comparatively large Pipe diameters and pipe wall thicknesses at.

A Particularly secure positioning of the sealing ring results when the support ring a conical frontal face has, in the operating state of the pipe joint of the sealing ring is applied.

The Invention further ausgestaltend it is proposed that the support ring its end facing away from the pipe end a radially outside having the Haltewulstes extending approach. In this way becomes the possibility created that the clamping surface of the union nut both with the associated clamping surface of the retaining bead as well with a radially outside arranged clamping surface of the support ring interacts.

alternative to a cylindrical configuration of the end portion of the formed Pipe this can also be designed conical, in which case to the tapered end portion extending up to the retaining bead cylindrical section should be connected to the a correspondingly adapted cylindrical portion of the support ring postpone, to achieve a sufficient mounting security. Such Tube end geometry is particularly suitable for thin-walled and small tubes.

Preferably thus has the inner circumferential surface of the support ring a cylindrical section that is in diameter to the diameter the cylindrical portion of the pipe section is adjusted. In addition, points the inner lateral surface of the support ring preferably a cylindrical portion upstream conical Section adapted to the tapered portion of the pipe end.

Preferably if the support ring in the operating state does not interact with the inner clamping surface of the union nut, should the holding bead in the operating state of the inner clamping surface of the nut be tense. Alternatively, it is also possible that the support ring one - preferably has conical clamping surface, the in the operating state of the pipe connection to - the inner also preferably adapted conical - clamping surface of the union nut is applied.

In addition, can the invention are further developed by the fact that the support ring a has front, perpendicular to the central axis of the tube aligned stop surface, in the operating state on an equally oriented end face of the fitting body is applied. This allows the fitter when tightening the nut be signaled by a significant increase in torque, that the components of the pipe connection "on block" and thus reaches the end of assembly is.

Further it is possible, that the retaining bead a front, preferably perpendicular to the central axis the pipe has aligned clamping surface, the opposite with a preferably equally aligned pipe end rear clamping surface of the support ring interacts.

The inner clamping surface the union nut can in particular conical (90 ° angle) be formed and the cooperating clamping surface of the Haltewulstes or the support ring should then also be adapted tapered run.

embodiments

The Erfidung will be described below with reference to several embodiments of a pipe joint, the are shown in the drawing, explained in more detail. It shows

1a a first embodiment of a pipe joint with cylindrical end portion of the tube and a round cross-section sealing ring;

1b as 1a , but with a trapezoidal in cross section sealing ring;

2a as 1a but with an enlarged diameter re-formed tube;

2 B as 2a but with a cross-sectionally approximately triangular sealing ring;

2c as 2a but with a conical support ring on its front face;

3a an alternative embodiment of the pipe joint with a tapered end portion of the deformed tube and

3b as 3a , but with a front abutment surface of the support ring.

1a shows a total with 1 Designated pipe connection in half section, which consists of a gland body shown only canceled 2 with an external thread 3 , a deformed tube also shown broken off 4 , a support ring 5 , a sealing ring 6 and a union nut 7 that exists with its internal thread 8th on the external thread 3 screwed on the fitting body.

The pipe 4 points at some distance from its front 9 a formed by a swaging operation in a special tool retaining bead 10 on, one of the front side 9 of the pipe 4 opposite rear retaining surface 11 in the form of a 90 ° cone and an opposite front retaining surface 12 own, which is also cone-shaped. The union nut 7 has an inner clamping surface 13 , which forms a 90 ° cone and on the one hand with the holding surface 11 of the retaining bead 10 cooperates and on the other at the likewise a 90 ° cone forming support surface 14 of the support ring 5 is applied. This one is in its inside diameter 15 the outer diameter 16 of the formed pipe 4 in the cylindrical end portion 17 adapted and further supported with its defining a 60 ° cone clamping surface 18 in the 60 ° inner cone 19 of the fitting body 2 from. Due to the two-sided clamping of the support ring 5 becomes the operating state of the pipe connection 1 defined, wherein the achievement of this operating condition for the fitter by an increase in torque due to the block system of the components fitting body 2 , Support ring 5 and union nut 7 is signaled. In the area in front of the front face 20 of the support ring 5 the sealing ring is chambered 6 on the outer diameter of the end portion 17 of the pipe 4 , The chamber in which the sealing ring 6 in the operating state of the pipe connection 1 is compressed, is formed by the inner cone 19 of the fitting body 4 , the front face 20 of the support ring 5 and the outer surface 21 of the pipe 4 in the area of its end section 17 ,

The support ring 5 is at his forehead 9 of the pipe 4 opposite end with a radially outside of the retaining bead 11 of the pipe 4 arranged approach 22 provided on the part of the conical holding surface 14 is formed. Radial within the neck 22 is also in the operating state of the pipe connection 1 a slight gap 23 between the front holding surface 12 of the retaining bead 10 and the opposite parallel surface 24 of the support ring 5 , This ensures that even with unavoidable tolerances in the formation of the retaining bead 10 in combination with the tolerances of all other components of the pipe joint 1 the clamping of the support ring 5 always in the area of the holding surface 14 and not in the area of the area 24 he follows. As a result, the pipe 4 also in the operating state by a small amount (axial width of the gap 23 ) in the direction of its central axis 25 can move. The outer diameter 26 of the pipe 4 in its un-formed area corresponds to the outer diameter 16 of the pipe 4 in the end section 17 after forming. The outer diameter 16 in the end section 17 of the pipe 4 is otherwise smaller than or maxi times the same size as the inner diameter 27 of the fitting body 2 in the area of its through hole D. Therefore, the front end surface comes 9 of the pipe 4 or the peripheral edge in the region of the transition from the end face 9 in the outer jacket 21 , of the pipe 4 not with the inner cone 19 of the fitting body 2 in contact with the inner cone 19 according to the British standard BS 5200 seamlessly into the inner jacket surface 29 of the fitting body passes.

The pipe connection 1' as they are in 1b is different from the pipe joint 1 according to 1a merely in that instead of the circular cross-section sealing ring 6 a trapezoidal in cross section sealing ring 6 ' is present, which is particularly favorable for connection to the support ring 5 suitable. The effective length of the ab sealing surfaces of the sealing ring 6 ' is opposite to the version according to 1a increases and therefore improves the sealing effect.

In the modified pipe connection 30 to 2a is compared with the pipe joints after the 1a and 1b a pipe 34 with a larger inner and outer diameter and an increased wall thickness available. The fitting body 2 but has remained unchanged. The support ring 5 has a corresponding to the outer diameter 16 of the pipe 34 in its end section 17 enlarged inside diameter 15 and an also enlarged outer diameter 35 on, with the wall thickness of the support ring 35 opposite to the support ring 5 after the 1a and 1b is slightly reduced. The inner diameter 36 of the pipe 34 both in its end section 17 as well as in its unconverted remaining section is smaller than the inner diameter 27 of the fitting body 2 in the area of its through hole. The outer diameter 31 of the pipe 34 both in its end section 17 as well as in its other non-formed section is however larger than the inner diameter 27 of the fitting body 2 in the area of its through hole. However, there is no attachment of the face 39 of the pipe 34 or the peripheral edge in the transition region of this end face 39 to the outer surface 38 of the pipe 34 on the inner cone 19 of the fitting body 2 , not even considering the gap 23 , which is a minimal displacement of the pipe 38 also in the operating state of the pipe connection 30 allowed in the axial direction.

At the pipe connection 30 ' according to 2 B owns the sealing ring 36 ' in cross section a trapezoidal shape, whereby the principle sealing quality is increased. Otherwise, there are no differences to the pipe connection 30 according to 2a available.

At the pipe connection 30 '' corresponding 2c finds a modified support ring 35 '' Use, which has a conically inwardly recessed front end face, 58 has, at the circular in cross-section sealing ring 36 '' is applied.

At the in 3a shown pipe connection 40 is the deformed end of the pipe 44 alternatively designed. The end section 47 of the pipe 44 has a front section with respect to its outer jacket 48 which is cone-shaped and an adjoining rear portion 49 that is cylindrical. According to the outer contour of this end section 47 is the inner contour of the support ring 45 formed, which also has a front cone-shaped section 48 ' and a rear cylindrical section 49 ' has. The support ring 45 is in this way before mounting on the end section 47 of the pipe 44 deferrable, due to appropriate tuning of the diameter in the areas 49 and 49 ' a certain clamping effect is achieved to simplify assembly.

The support ring 45 indicates at its end face 9 the tube facing away from a clamping surface 54 on, perpendicular to the central axis 25 of the pipe 44 is aligned and with a parallel thereto aligned clamping surface 52 at the retaining bead 50 of the pipe 44 interacts. On the opposite side has the retaining bead 50 a conical clamping surface 51 on, in the operating state of the pipe connection 40 on a correspondingly shaped conical inner clamping surface 53 the union nut 7 is applied.

As in the present case, the components union nut 7 , Retaining bead 50 , Support ring 45 and fitting body 2 lie in the operating state "on block" is an axial mobility of the tube 44 not given in the operating state. In the operating state remains between the end face 9 of the pipe 44 and the fitting body 2 , in particular its inner cone 19 , a slight clearance F.

While the pipe connection 40 according to 3a If necessary, if necessary due to loading due to settling by turning the nut 7 after pulling is, this is at the alternatively in 3b shown pipe connection 40 ' therefore hardly possible because of the support ring used there 45 ' a front stop surface 55 owns that with a perpendicular to the axis 25 of the pipe 44 aligned end face of the fitting body 2 works together. The assembly end is the fitter at the pipe connection 40 ' indicated by a significant increase in the torque curve when the components union nut 7 , Retaining bead 50 , Support ring 45 ' and fitting body 2 '' on block ".

Claims (13)

Pipe connection ( 1 . 1' . 30 . 30 ' . 30 '' . 40 . 40 ' ) with a deformed tube ( 4 . 34 . 44 ), a fitting body ( 2 ) with an inner cone ( 19 ), one on the fitting body ( 2 ) screw-on union nut ( 7 ) with an inner clamping surface ( 13 . 53 ), which in the operating state of the pipe connection ( 1 . 1' . 30 . 30 ' . 30 '' . 40 . 40 '' ) with a forming the tube end forming technology, radially over the outer surface ( 21 . 38 ) of the pipe ( 4 . 34 . 44 ) outwardly projecting holding surface ( 11 . 51 ) of a retaining bead ( 10 . 50 ) of the pipe ( 4 . 34 ) and with a support ring ( 5 . 35 . 35 '' . 45 . 45 ' ), from the front side ( 9 . 39 ) of the pipe ( 4 . 34 . 44 ) Her on this is pushed and with a pipe end facing conical Clamping surface ( 18 ) in the inner cone ( 19 ) of the fitting body ( 2 ), wherein the retaining bead ( 10 . 50 ) further with a pipe end facing the holding surface ( 12 . 52 ) with an adapted to the pipe end facing away from the holding surface ( 24 . 54 ) of the support ring ( 5 . 35 ' . 35 '' . 45 . 45 ' ) cooperates, characterized in that the inner cone ( 19 ) of the fitting body ( 2 ) directly in the cylindrical, inner circumferential surface ( 29 ), the through hole (D) of the fitting body ( 2 ) defines, transitions and the end face ( 9 . 39 ) of the pipe ( 4 . 34 . 44 ) at least partially radially inwardly in the cross section of the through hole (D) of the screwing body ( 2 ). Pipe connection according to claim 1, characterized in that the support ring ( 5 . 35 . 35 '' . 45 . 45 ' ) a sealing ring ( 6 . 6 ' 36 '') in the form of a soft seal, wherein the sealing ring ( 6 . 6 ' . 36 ' . 36 '' ) is enclosed in a triangular-shaped chamber, which extends from an outer surface ( 21 of the end section ( 17 . 47 ) of the pipe ( 4 . 34 . 44 ), a pipe end facing the front end face ( 20 . 38 ) of the support ring ( 5 . 35 . 35 '' . 45 . 45 ' ) and the inner cone ( 19 ) of the fitting body ( 2 ) is formed. Pipe connection according to claim 2, characterized in that the sealing ring ( 6 . 36 ' . 36 '' ) with a connecting surface to the front end face of the support ring ( 5 . 35 ' . 35 '' ) glued or vulcanized on it. Pipe connection according to one of claims 1 to 3, characterized in that the pipe end has a cylindrical end portion ( 17 ) whose outer diameter ( 16 ) the outer diameter ( 26 ) of the pipe ( 4 . 34 ) in the undeformed area. Pipe connection according to claim 4, characterized in that the support ring ( 35 '' ) a conical, front end face ( 38 ), at which in the operating state of the pipe connection ( 30 '' ) the sealing ring ( 36 '' ) is present. Pipe connection according to one of claims 4 to 6, characterized in that the support ring ( 5 . 35 . 35 '' ) at its end remote from the tube end a radially outside of the retaining bead ( 10 ) ( 22 ) having. Pipe connection according to one of claims 1 to 3, characterized in that the pipe end a conical section ( 48 ), to which a to the retaining bead ( 50 ) extending cylindrical portion ( 49 ) connected. Pipe connection according to claim 7, characterized in that the inner circumferential surface of the support ring ( 45 ) has a cylindrical portion which is in diameter to the diameter of the cylindrical portion ( 49 ) of the pipe end and a conical section ( 48 ' ) facing the conical section ( 48 ) of the pipe end is adjusted. Pipe connection according to claim 6 or 7, characterized in that the retaining bead ( 50 ) in the operating state of the pipe connection from the inner clamping surface ( 53 ) of the union nut ( 7 ) is stretched. Pipe connection according to one of claims 1 to 6, characterized in that the support ring ( 5 . 35 . 35 '' ) a clamping surface ( 14 ), which in the operating state of the pipe connection ( 1 . 1' . 30 . 30 ' . 30 '' ) on the inner clamping surface ( 13 ) of the union nut ( 7 ) is present. Pipe connection according to one of claims 8 to 10, characterized in that the support ring ( 45 ' ) a front, perpendicular to the central axis ( 25 ) of the pipe ( 44 ) aligned stop surface ( 45 ), which in the operating state on an equally oriented end face ( 56 ) of the fitting body ( 2 ) is present. Pipe connection according to one of claims 1 to 11, characterized in that the retaining bead ( 50 ) a front, perpendicular to the central axis ( 25 ) of the pipe ( 44 ) aligned clamping surface ( 52 ), which with an equally aligned, the tube end facing away from the rear clamping surface ( 54 ) of the support ring ( 45 . 45 ' ) cooperates. Pipe connection according to one of claims 1 to 12, characterized in that the inner clamping surface ( 13 ) of the union nut ( 7 ) conical and the cooperating clamping surface ( 51 ) of the retaining bead ( 50 ) is adapted tapered.