Clamping sleeve type pipeline connecting structure

Abstract

The utility model discloses a clamping sleeve type pipeline connecting structure which comprises a guide pipe, a straight-through nut and a clamping sleeve. First outer tooth grooves and second outer tooth grooves are formed in the outer surface of the conduit at intervals; a first cylindrical surface, a first sealing conical surface, a threaded tool withdrawal groove and a second cylindrical surface are sequentially arranged in an inner cavity of the straight-through nut in the axial direction. The diameter of the first cylindrical surface is matched with the outer diameter of the conduit; the second cylindrical surface is provided with first threads; a second sealing conical surface is arranged at one end of the clamping sleeve; the second sealing conical surface is matched with the first sealing conical surface; a deformable inner cavity is formed in the clamping sleeve; a first inner tooth groove and a second inner tooth groove are sequentially formed in the cavity wall of the deformable inner cavity in the axial direction at intervals. The first inner tooth grooves are matched with the first outer tooth grooves; the second inner tooth grooves are matched with the second outer tooth grooves; the diameter of the deformable inner cavity is larger than the inner diameter of the catheter. The clamping sleeve type pipeline connecting structure is low in flaring difficulty, easy to assemble, light in weight and good in sealing effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical manufacturing, and in particular relates to a sleeve type pipeline connection structure. Background Art

[0002] Flight safety needs to be guaranteed by a highly reliable fuel system. There are many aviation hydraulic pipelines and they are widely distributed. Pipe joints are needed to connect the pipelines. Leakage in any of the pipeline joints may cause aircraft hydraulic system failure or even a major flight accident. However, during the aircraft development process, aircraft design and manufacturing units often only focus on the analysis of the characteristics of hydraulic components such as pumps, valves, and cylinders, while ignoring the impact of pipeline components that realize aircraft system functions on aircraft performance, thus bringing hidden dangers to the aircraft.

[0003] At present, the non-flared pipe connection structure used in aerospace hydraulic systems, fuel systems, environmental control systems, etc. adopts a 74° sealing structure. For large-diameter pipes, it is necessary to expand the pipe on the sealing structure according to the standard "HB 4-52-2002 (Pipeline Expansion)" to form an expanded pipe connector. When in use, the sealing of the pipe connection is achieved by tightening the expanded pipe connector.

[0004] However, due to the constraints of factors such as raw material quality and the maturity of the expansion process, as the diameter of the pipeline increases, the risk of expansion cracking, deformation and other problems will increase, and the expansion pipeline connector will easily leak. In addition, the existing expansion pipeline connectors are also heavy and inconvenient to use. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a sleeve type pipeline connection structure.

[0006] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0007] The utility model provides a ferrule type pipeline connection structure, comprising a conduit, a straight-through nut and a ferrule;

[0008] The outer surface of the catheter is provided with a first outer tooth groove and a second outer tooth groove at intervals;

[0009] The inner cavity of the through nut is provided with a first cylindrical surface, a first sealing cone surface, a thread backing groove and a second cylindrical surface in sequence along the axial direction; the diameter of the first cylindrical surface is adapted to the outer diameter of the conduit; the second cylindrical surface is provided with a first thread;

[0010] One end of the ferrule is provided with a second sealing conical surface; the second sealing conical surface is adapted to the first sealing conical surface; a deformable inner cavity is arranged inside the ferrule; the cavity wall of the deformable inner cavity is sequentially and spaced apart with a first inner tooth groove and a second inner tooth groove along the axial direction; the first inner tooth groove is adapted to the first outer tooth groove; the second inner tooth groove is adapted to the second outer tooth groove; the diameter of the deformable inner cavity is larger than the inner diameter of the conduit.

[0011] Optionally, the other end of the ferrule is provided with a third sealing conical surface; the ferrule-type pipeline connection structure further includes: a docking pipe fitting.

[0012] One end outer surface of the docking pipe fitting is provided with a second thread, and a fourth sealing conical surface is arranged inside; the second thread is adapted to the first thread; the third sealing conical surface is adapted to the fourth sealing conical surface.

[0013] Optionally, a thread screwing chamfer is arranged at the entrance of the second cylindrical surface.

[0014] Optionally, concave platforms are respectively arranged at the two ends' entrances of the deformable inner cavity.

[0015] Optionally, the outer surface of the straight-through nut is provided with six flat surfaces.

[0016] Optionally, the entrance of the first cylindrical surface is rounded.

[0017] A ferrule-type pipeline connection structure provided by the present utility model includes: a conduit, a straight-through nut, and a ferrule. Among them, the conduit, the straight-through nut, and the ferrule are coaxially connected. The conduit axially accesses the straight-through nut from the first cylindrical surface of the straight-through nut and leads to the second cylindrical surface of the straight-through nut; the ferrule axially accesses the straight-through nut from the second cylindrical surface of the straight-through nut until the second sealing conical surface of the ferrule abuts against the first sealing conical surface of the straight-through nut, and the cavity wall of the deformable inner cavity inside the ferrule is sequentially and spaced apart with a first inner tooth groove and a second inner tooth groove which are engaged with the first outer tooth groove and the second outer tooth groove of the conduit respectively, so as to achieve sealing at the abutting position of the second sealing conical surface and the first sealing conical surface and at the engaging position of the first inner tooth groove and the second inner tooth groove with the first outer tooth groove and the second outer tooth groove.

[0018] In summary, in the ferrule-type pipeline connection structure provided by the present utility model, the connection between the conduit, the straight-through nut, and the ferrule does not require insurance, reduces the flaring difficulty, has high space utilization rate, reduces the processing cost, shortens the processing time, and improves the production efficiency. The assembly process requirements are simple and the operation is convenient. Moreover, the dimensions between the conduit, the straight-through nut, and the ferrule are compact, and the first inner tooth groove of the straight-through nut is adapted to the first outer tooth groove of the ferrule, and the second inner tooth groove of the straight-through nut is adapted to the second outer tooth groove of the ferrule, achieving a good sealing effect.

[0019] Compared with the pipeline connection structure used in the prior art, the ferrule-type pipeline connection structure provided by the present utility model has a weight reduction of 40% - 50% year-on-year, improving the pressure resistance and service life of the pipeline system.

[0020] The following will further elaborate on the present utility model in conjunction with the accompanying drawings. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a ferrule-type pipeline connection structure provided by an embodiment of the present utility model;

[0022] Figure 2 is a schematic structural diagram of a conduit provided by an embodiment of the present utility model;

[0023] Figure 3 is a schematic structural diagram of a straight-through nut provided by an embodiment of the present utility model;

[0024] Figure 4 is a schematic structural diagram of a ferrule provided by an embodiment of the present utility model.

[0025] Reference Numerals: 1, conduit; 2, straight-through nut; 3, ferrule; 101, first external tooth groove; 102, second external tooth groove; 201, supporting cylindrical surface; 202, supporting transition arc surface; 203, chamfer; 204, hexagonal surface; 205, fillet; 206, first sealing cone surface; 207, thread relief groove; 208, first thread; 209, thread engagement chamfer; 301, concave platform; 302, first internal tooth groove; 303, second sealing cone surface; 304, deformable inner cavity; 305, second internal tooth groove; 306, third sealing cone surface. Detailed Embodiments

[0026] The following further describes the present utility model in detail with reference to specific embodiments, but the implementation manners of the present utility model are not limited thereto.

[0027] To solve the problems of difficult flaring, unsatisfactory sealing effect, and large structural weight of existing flared pipeline connectors, an embodiment of the present utility model provides a ferrule-type pipeline connection structure. Refer to Figure 1 , Figure 1 is a schematic structural diagram of a ferrule-type pipeline connection structure provided by an embodiment of the present utility model. The ferrule-type pipeline connection structure includes a conduit 1, a straight-through nut 2, and a ferrule 3.

[0028] In the embodiment of the present utility model, the outer surface of the conduit 1 is provided with a first external tooth groove 101 and a second external tooth groove 102 at intervals. Refer to Figure 2 , Figure 2It is a schematic structural diagram of a catheter provided by an embodiment of the present utility model. Among them, both the first external tooth groove 101 and the second external tooth groove 102 are triangular tooth grooves. By providing the first external tooth groove 101 and the second external tooth groove 102 on the outer surface of the catheter 1, the tightness and stability of the catheter 1 during subsequent connection with other structures can be increased, and the risk of loosening or disconnection can be reduced.

[0029] See Figure 3 , Figure 3 It is a schematic structural diagram of a straight-through nut 2 provided by an embodiment of the present utility model. Among them, the internal cavity of the straight-through nut 2 is sequentially provided with a first cylindrical surface, a first sealing cone surface 206, a thread relief groove 207, and a second cylindrical surface along the axial direction.

[0030] In the embodiment of the present utility model, the diameter of the first cylindrical surface is adapted to the outer diameter of the catheter 1, thereby ensuring good contact between the internal cavity of the straight-through nut 2 and the catheter 1, and improving the stability of the connection between the catheter 1 and the straight-through nut 2.

[0031] In the embodiment of the present utility model, the second cylindrical surface is provided with a first thread 208. The straight-through nut 2 can be tightly connected to other structures through the first thread 208 on the second cylindrical surface. At the same time, threaded connections are usually easier to disassemble and reassemble than other types of connections, and are more suitable for components that require frequent inspection, maintenance, and replacement. The threaded connection design can significantly reduce maintenance costs and time. Among them, parameters such as the type, size, and thread diameter of the first thread 208 can be determined according to requirements or the size and type of the structure to be connected, and are not limited herein.

[0032] See Figure 4 , Figure 4 It is a schematic structural diagram of a ferrule provided by an embodiment of the present utility model. One end of the ferrule 3 is provided with a second sealing cone surface 303, and the second sealing cone surface 303 is adapted to the first sealing cone surface 206.

[0033] The ferrule 3 is located in the internal cavity of the straight-through nut 2, and the first sealing cone surface 206 of the internal cavity of the straight-through nut 2 is adapted to the second sealing cone surface 303 provided at one end of the ferrule 3. This adaptation design does not require additional fastening tools, simplifies the installation process, and achieves a good sealing effect, which is suitable for narrow pipeline spaces.

[0034] The adaptation of the second sealing cone surface 303 to the first sealing cone surface 206 means that the shape, slope, and size of the second sealing cone surface 303 are adapted to those of the first sealing cone surface 206, thereby ensuring a good sealing effect and stability.

[0035] In the embodiment of the present utility model, the ferrule 3 is internally provided with a deformable inner cavity 304, and the ferrule 3 can have a certain deformation ability through the deformable inner cavity 304 provided inside the ferrule 3.

[0036] In the embodiment of the present utility model, the cavity wall of the deformable inner cavity 304 is sequentially and spacedly provided with a first inner tooth groove 302 and a second inner tooth groove 305 along the axial direction. The first inner tooth groove 302 is adapted to the first outer tooth groove 101, and the second inner tooth groove 305 is adapted to the second outer tooth groove 102.

[0037] The first inner tooth groove 302 of the straight-through nut 2 is adapted to the first outer tooth groove 101 of the ferrule 3, and the second inner tooth groove 305 of the straight-through nut 2 is adapted to the second outer tooth groove 102 of the ferrule 3. By interlocking with each other, the friction between the contact surfaces is increased, making the ferrule 3 more stable and not easy to loosen when fixing the straight-through nut 2. Moreover, a good sealing effect is provided through the adapted connection of the tooth grooves.

[0038] Wherein, the adaptation of the first inner tooth groove 302 to the first outer tooth groove 101 and the adaptation of the second inner tooth groove 305 to the second outer tooth groove 102 mean that the tooth groove types, dimensions, tooth groove numbers, tooth groove intervals, etc. of the first inner tooth groove 302 and the first outer tooth groove 101, and the second inner tooth groove 305 and the second outer tooth groove 102 are all adapted to achieve good connection stability and sealing effect.

[0039] In addition, the connection between the straight-through nut 2 and the ferrule 3 through the tooth grooves also takes into account the convenience and cost-effectiveness of installation and maintenance.

[0040] In the embodiment of the present utility model, the diameter of the deformable inner cavity 304 of the ferrule 3 is larger than the inner diameter of the catheter 1, ensuring that the ferrule 3 can be tightly connected around the catheter 1. The flaring function of the catheter 1 is realized through the straight-through nut 2 with a larger inner cavity diameter and the ferrule 3.

[0041] In the ferrule-type pipeline connection structure provided by the embodiment of the present utility model, the connection between the catheter 1, the straight-through nut 2 and the ferrule 3 does not require insurance, reducing the flaring difficulty, having high space utilization rate, reducing the processing cost, shortening the processing time, and improving the production efficiency. The assembly process requirements are simple and the operation is convenient.

[0042] Moreover, the dimensions of the catheter 1, the straight-through nut 2 and the ferrule 3 are compact. The adaptation of the first inner tooth groove 302 of the straight-through nut 2 to the first outer tooth groove 101 of the ferrule 3 and the adaptation of the second inner tooth groove 305 of the straight-through nut 2 to the second outer tooth groove 102 of the ferrule 3 achieve a good sealing effect.

[0043] Compared with the pipeline connection structure used in the prior art, the ferrule-type pipeline connection structure provided by the present utility model has a weight reduction of 40% - 50% year-on-year, improving the pressure resistance strength and service life of the pipeline system.

[0044] In one implementation, the other end of the ferrule 3 is provided with a third sealing conical surface 306. The ferrule-type pipeline connection structure further includes a docking fitting. One end of the docking fitting has a second thread on its outer surface and a fourth sealing conical surface inside; the second thread is adapted to the first thread 208; the third sealing conical surface 306 and the fourth sealing conical surface are adapted.

[0045] In the embodiment of the present utility model, the ferrule-type pipeline connection structure further includes a docking fitting, and one end of the docking fitting has a second thread on its outer surface. One end of the docking fitting with the second thread on its outer surface is connected to the straight-through nut 2 through the second cylindrical surface of the straight-through nut 2; the second cylindrical surface is provided with a first thread 208. The adaptation of the second thread and the first thread 208 ensures the stable connection and sealing performance between the docking fitting and the straight-through nut 2. The adaptation of the second thread and the first thread 208 means the adaptation of parameters such as the type, size, and thread diameter between the second thread and the first thread 208.

[0046] One end of the docking fitting with the second thread on its outer surface has a fourth sealing conical surface inside. The fourth sealing conical surface is adapted to the third sealing conical surface 306 provided at the other end of the ferrule 3, thereby ensuring the sealing effect between the inner cavity of the docking fitting and the deformable inner cavity 304 of the ferrule 3, that is, ensuring the sealing performance between the conduit 1, the ferrule 3, and the docking fitting, and avoiding the problems of leakage in the pipeline connection structure.

[0047] In one implementation, a thread engagement chamfer 209 is provided at the entrance of the second cylindrical surface of the straight-through nut 2. The thread engagement chamfer 209 can avoid possible problems such as fracture and plastic instability during the screwing process of the straight-through nut 2 and the docking fitting. At the same time, the thread engagement chamfer 209 can also facilitate the insertion and tightening of the docking fitting.

[0048] In one implementation, concave platforms 301 are respectively provided at the entrances of both ends of the deformable inner cavity 304 provided inside the ferrule 3. The concave platforms 301 can reduce stress concentration, improve the durability of the ferrule 3, and at the same time facilitate the assembly of the conduit 1 and the ferrule 3.

[0049] In one implementation, a hexagon surface 204 is provided on the outer surface of the straight-through nut 2. During the installation process, it is easier to hold and fix through the hexagon surface 204 provided on the outer surface of the straight-through nut 2, avoiding the slippage of the straight-through nut 2 during the tightening process and ensuring good interoperability.

[0050] In one implementation, the outer surface of the straight-through nut 2 sequentially includes a support cylindrical surface 201, a support transition arc surface 202, and a hexagon surface 204 along the axial direction. Among them, a chamfer 203 is provided at the connection between the support transition arc surface 202 and the hexagon surface 204. The design of the support cylindrical surface 201 and the support transition arc surface 202 also ensures the easy operation and easy installation of the straight-through nut 2.

[0051] In one implementation, a fillet 205 is provided at the entrance of the first cylindrical surface. By providing the fillet 205 at the entrance of the first cylindrical surface, the surface roughness can be reduced, making it smoother, and the stress concentration at the entrance can be significantly reduced, prolonging the service life of the straight-through nut 2. At the same time, it is convenient for the assembly of the conduit 1 and the straight-through nut 2.

[0052] When using the ferrule-type pipeline connection structure provided by the present utility model, the ferrule 3 and the conduit 1 are axially extruded to cause the ferrule 3 to undergo axial plastic deformation and neck inwards. After necking, the first internal tooth groove 302 and the second internal tooth groove 305 arranged at intervals along the axial direction of the cavity wall of the deformable inner cavity 304 of the straight-through nut 2 are embedded in the outer surface of the conduit 1. Then, the first thread 208 provided on the second cylindrical surface of the straight-through nut 2 is connected to the second thread provided on the outer surface of one end of the docking pipe fitting, pushing the ferrule 3 to form a secondary plastic deformation. The first internal tooth groove 302 and the second internal tooth groove 305 are connected to the first external tooth groove 101 and the second external tooth groove 102 arranged at intervals on the outer surface of the conduit 1. A sealing band with a width of about 0.2 - 0.4 mm is generated between the second sealing cone surface 303 and the third sealing cone surface 306 of the ferrule 3, achieving the installation and sealing connection process, thereby realizing the flaring function with high sealing performance for the conduit 1.

[0053] It should be noted that the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order different from those illustrated or described here. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present utility model. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present utility model.

[0054] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0055] Although the present utility model has been described in connection with various embodiments, however, in the process of implementing the claimed present utility model, those skilled in the art can understand and implement other variations of the disclosed embodiments by viewing the accompanying drawings and the disclosed content. In the description of the present utility model, the term "comprising" does not exclude other components or steps, the term "a" or "an" does not exclude a plurality, and the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, certain measures are described in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0056] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0057] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0058] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the art of the present utility model, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A ferrule type pipe connection structure, characterized in that: Includes conduit, straight nut and ferrule; The outer surface of the catheter is provided with a first outer tooth groove and a second outer tooth groove at intervals; The inner cavity of the through nut is provided with a first cylindrical surface, a first sealing cone surface, a thread backing groove and a second cylindrical surface in sequence along the axial direction; the diameter of the first cylindrical surface is adapted to the outer diameter of the conduit; the second cylindrical surface is provided with a first thread; A second sealing cone surface is provided at one end of the ferrule; the second sealing cone surface is matched with the first sealing cone surface; a deformable inner cavity is provided inside the ferrule; the cavity wall of the deformable inner cavity is provided with a first inner tooth groove and a second inner tooth groove in sequence along the axial direction; the first inner tooth groove is matched with the first outer tooth groove; the second inner tooth groove is matched with the second outer tooth groove; the diameter of the deformable inner cavity is larger than the inner diameter of the catheter.

2. The ferrule type pipe connection structure according to claim 1, characterized in that: The other end of the ferrule is provided with a third sealing cone surface; the ferrule type pipeline connection structure also includes: a butt joint pipe fitting; One end of the butt joint pipe is provided with a second thread on the outside and a fourth sealing cone surface on the inside; the second thread is matched with the first thread; the third sealing cone surface is matched with the fourth sealing cone surface.

3. The ferrule type pipe connection structure according to claim 2, characterized in that: A thread engagement chamfer is provided at the entrance of the second cylindrical surface.

4. The ferrule type pipe connection structure according to claim 1, characterized in that: Concave platforms are respectively provided at the entrances at both ends of the deformable inner cavity.

5. The ferrule type pipe connection structure according to claim 1, characterized in that: The outer surface of the through nut is provided with six aspects.

6. The ferrule type pipe connection structure according to claim 1, characterized in that: The entrance of the first cylindrical surface is rounded.

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