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CN-122029372-A - Pipe coupling having differently tapered connection ends and method of installing a pipe coupling

CN122029372ACN 122029372 ACN122029372 ACN 122029372ACN-122029372-A

Abstract

The invention relates to a pipe connection arrangement (1,30,36), in particular for connecting thin-walled metal pipes (4), comprising a pipe (4) and a connecting member (2), which pipe has a modified end portion (3, 31), wherein the modified end portion (3, 31) exhibits a truncated cone shape (6) with a diameter (9) which decreases gradually towards the connecting end and a pipe end cone angle # ) Thereby forming an outer circumferential sealing surface, the connecting member having a receiving recess (13) with a truncated cone shape having a diameter gradually increasing towards the connecting end and a receiving recess cone angle # ) Thereby forming an inner circumferential sealing surface. Before the modified end portions (3, 31) of the tube (4) are fixed in the receiving recesses (13) of the connecting device (2), the tube end taper angle #, at least in the region of the sealing surfaces ）More than the acceptance of concave cone angle（ ) At least 1.5 °, preferably at least 2 °, more preferably at least 3 °, even more preferably at least 4 °.

Inventors

  • J ö rg Altenrat

Assignees

  • 丹佛斯有限公司

Dates

Publication Date
20260512
Application Date
20240916
Priority Date
20230921

Claims (11)

  1. 1. A pipe connection arrangement (1,30,36), in particular for connecting thin-walled metal pipes (4), comprising: a tube (4) having a modified end portion (3, 31), wherein the modified end portion (3, 31) exhibits a truncated cone shape (6) having a diameter (9) gradually decreasing towards the connecting end and a tube end cone angle #) ) Thereby forming an outer circumferential sealing surface, A connecting member (2) having a receiving recess (13) with a truncated conical shape having a diameter gradually increasing towards the connecting end and a receiving recess cone angle [ ] ) Thereby forming an inner circumferential sealing surface, Characterized in that the tube end taper angle is at least in the region of the sealing surfaces before the reshaped end portion (3, 31) of the tube (4) is fixed in the receiving recess (13) of the connecting device (2) Taper angle of the receiving recess At least 1.5 °, preferably at least 2 °, more preferably at least 3 °, even more preferably at least 4 °.
  2. 2. A pipe connection arrangement (1,30,36) according to claim 1, wherein, at least in the region of the sealing surfaces, the pipe end cone angle Taper angle with the receiving recess The difference between them is not more than 10 °, preferably 7.5 °, more preferably 5 °, even more preferably 3.5 °.
  3. 3. A pipe connection arrangement (1,30,36) according to any one of the preceding claims, wherein, at least in the region of the sealing surfaces, the pipe end cone angle And/or the cone angle of the receiving recess Is of a size equal to the standard cone angle of a pipe connection arrangement having a truncated cone shape Nearby-15 ° to 15 °, preferably-10 ° to 10 °, even more preferably-5 ° to 5 °, still more preferably-3 ° to 3 °, wherein the standard cone angle Preferably the cone angle is taken from the group comprising 24 °, 40 ° and 60 °.
  4. 4. The pipe connection arrangement (1,30,36) according to any one of the preceding claims, characterized in that the pipe connection arrangement (1, 30) further comprises a tensioning device, preferably a union nut (14), for pressing and/or holding the reshaped end portion (3, 31) of the pipe (4) into the receiving recess (13) of the connection member (2).
  5. 5. The pipe connection arrangement (1,30,36) according to any one of the preceding claims, in particular according to claim 4, characterized in that the modified end portion (3, 31) of the pipe (4) comprises a mounting collar (8), preferably adjacent to the truncated conical region (6) of the pipe end (3, 31).
  6. 6. The pipe connection arrangement (1,30,36) according to any one of the preceding claims, in particular according to claim 4 or 5, characterized by at least a support ring (15,26,33), which is preferably arranged at least partially between the mounting collar (8) of the pipe (4) and the force-achieving surface (19 c) of the tensioning device (14).
  7. 7. The pipe connection arrangement (1, 30) according to any of the preceding claims, characterized in that the truncated cone-shaped section of the end portion (3, 31) of the pipe (4) is in axial direction in extent ± ) Less than the extent of the truncated-cone-shaped section of the receiving recess (13) of the connecting element (2) in the axial direction )。
  8. 8. The pipe connection arrangement (1, 30) according to any of the preceding claims, in particular according to claim 6 or 7, characterized in that the support ring (15, 26) protrudes into a void (16) formed between a part of the end section (3, 31) of the pipe (4), in particular between a part of the end section (3, 31) of the pipe (4) located near the mounting collar (8) and facing away from the open end (5) of the end section (3, 31) of the pipe (4) and a part of the receiving recess (13) of the connection device (2), in particular in that the support ring (15, 26) comprises an axial protrusion protruding into said void (16).
  9. 9. A pipe connection arrangement (1, 30) according to any of the preceding claims, characterized in that the annular end surface of the open end (3) of the pipe is substantially free from contact with the connection member (2).
  10. 10. The pipe connection arrangement (1,30,36) according to any one of the preceding claims, characterized in that at least one limiting surface (23) is provided between the connection member (2), the support ring (15) and/or the tensioning device (14), and wherein the at least one limiting surface (23) is dimensioned, designed and arranged to hinder axial movement of the pipe end (3, 31) and the connection member (2) relative to each other past a certain point and/or to cause a significant increase in the required fixing force when passing a certain point, in particular for providing tactile feedback to a user of the pipe connection arrangement (1, 30) when connecting the pipe end (3, 31) to the connection member (2).
  11. 11. A method of connecting a pipe (4) of a pipe connection arrangement (1,30,36) and a connection member (2) according to any one of the preceding claims, characterized in that by pushing together the pipe end (3, 31) of the pipe (4) and the receiving recess (13) of the connection member (2), grinding and/or deforming contact takes place between the contact surface of the pipe end (3, 31) of the pipe (4) and the contact surface of the receiving recess (13) of the connection member (2), wherein the position and/or size of the grinding/deforming contact changes during the connection, resulting in an adaptation of the corresponding surfaces and possibly in a partial friction welding process.

Description

Pipe coupling having differently tapered connection ends and method of installing a pipe coupling The present invention relates to a pipe connection arrangement, in particular to a pipe connection arrangement for connecting thin-walled metal pipes. In various industries, research, techniques and machinery, the transportation of gases, liquids and general fluids between different locations and devices is a standard task. The locations and devices that must be connected may be close to each other (e.g., a few centimeters or decimeters apart), but may also be very far from each other (e.g., hundreds of kilometers). Such statements include all different dimensions therebetween, such as distances on the order of meters, tens of meters, hundreds of meters, kilometers, etc. It is well known that pipes, tubes and hoses can be used for such transfer of gases and liquids. Depending on the requirements of the particular task in question, the appropriate dimensions, wall thickness, materials etc. must be chosen for the tube and hose to be used. These requirements include, but are not limited to, pressure, temperature (of the fluid and surrounding environment), state of matter, chemical composition, fluid passage rate, presence of vibration, corrosive conditions, permission to diffuse out of/into the tube, and the like, to name a few. For example, if hydrogen is to be transported, diffusion may become quite problematic due to the high diffusion rate of hydrogen. A well known follow-up problem is that the tube/hose is inevitably connected to the device and the two tube ends are connected to each other (especially in view of the limited possible length of the tube and hose). Here, not only the above-described overall frame but also the ease of handling of various components are considered. It should be noted that under certain conditions, for example if vibration does occur, the connections between the connected pipe ends and between the pipe and the connected device are particularly prone to leakage, breakage and failure. However, it is not surprising that various proposals have been made for pipe connection arrangements, due to the frequent and almost universal use of pipes and hoses, and thus the corresponding connection arrangements. One example is a ferrule assembly for a catheter fitting as described in WO 2010/068762 A1. Here, two ferrule-type conduit gripping devices to be used in combination are arranged on the tube end. When the pipe end is connected to the female connector body via the union nut, the two gripping means, which are in contact with each other via the conical contact surface, are moved closer together, causing one of the radially inner gripping means to cut into the circumferential surface of the pipe end, which in turn creates a positive form locking contact which inhibits axial movement of the gripping means relative to the pipe. Thus, the corresponding compounds of the tube end and the clamping device can be screwed tightly onto the female connector device by using a union nut. As can be seen from US patent 3,103,373A, the basic design of the assembly disclosed in the present application has been known for decades and works very well in practice. However, it is still prone to leakage problems, which become more pronounced in the case of gases exhibiting high diffusion rates, as is the case with hydrogen. Another problem is that the assembly of the arrangement is prone to various assembly errors (e.g. due to incorrect placement of the clamping device). Furthermore, due to the design concept itself, such a connection arrangement is not suitable for thin-walled tubes, since the tube ends must be able to withstand the high radially inward directed pressure exerted by the clamping means. Another problem associated with the design concept is that when this type of connection is used in environments with significant vibrations, it is relatively prone to leakage problems, even mechanical failure. Another proposal is made in european patent EP 2 872,811 B1. Wherein it is suggested to deform the end of the tube in such a way that the end forms an inwardly tapering truncated cone-shaped end portion, wherein the outer conical surface of this end portion is designed to be in contact with a corresponding inner conical contact surface of the connecting member. In this way, a tapered connection is established with a relatively large tapered contact area, which is relatively fluid and gas tight. In order to further increase the tightness of the connection between the tube and the connection member, sealing means, such as an O-ring or a circumferentially applied sealing material, may be provided. In order to achieve the required pressure between the pipe end and the connecting member, thereby establishing a good mechanical contact between the contact surfaces, the pipe end is provided with a second bending zone of decreasing diameter (in a direction facing away from the pipe opening). The second bending zone form