1. A system pipeline based on a rolling combined conduit is characterized by comprising: at least one flareless-flare combination conduit and at least one flareless combination conduit;

the flareless combination catheter includes: a first conduit; the first end of the first conduit is fixed with the first light straight-through joint in a rolling connection mode; the second end of the first guide pipe is an extrusion type structural component, a sealing type structural component, a clamping sleeve type structural component or a rolling type structural component;

the no-flare combination catheter includes: a second conduit; the first end of the second conduit is fixed with the second light straight-through joint in a rolling connection mode, and the second end of the second conduit is assembled with the flat nozzle and the flaring nut in a flaring mode.

2. The rolled composite conduit-based system pipe of claim 1, wherein the first conduit has a retention step within the first lightweight through-fitting for fixing the run-in length of the first conduit;

the second conduit has a retention step in the second light straight fitting for fixing the length of the second conduit that extends into.

3. The rolled composite conduit-based system pipe of claim 1, wherein the threaded end of the first lightweight through-fitting is outwardly threaded and the threaded end is externally threaded;

the threaded end of the second light straight-through joint faces outwards, and the threaded end is provided with external threads.

4. The rolled composite conduit-based system pipe of claim 1 wherein the second end of the second conduit is fitted with a flat nozzle in a 74 ° flared form of the conduit, the flat nozzle large end facing outward.

5. The rolled composite conduit-based system pipe of claim 1 wherein the flare nut passes through the second conduit with a threaded end outward and the threaded end is internally threaded.

6. The system piping of claim 1, wherein the conduit is a straight conduit of fixed length, or a curved conduit.

7. The system piping as claimed in claim 1, wherein said internal threads are MJ threads; the external thread is an MJ thread.

8. The system piping of claim 1, wherein the conduit is made of titanium alloy or stainless steel, the sleeve is made of stainless steel, and the lightweight through-connection is made of titanium alloy or stainless steel.

9. A rolling type combined conduit-based system pipeline assembly method is characterized in that a flareless structure assembly form and a flareless-flareless structure assembly form are adopted to assemble a combined conduit to form a system pipeline;

wherein, flareless formula structure assembly form includes:

assembling a light straight-through joint at the non-flared end of the conduit, wherein the light straight-through joint can axially move at the outer side of the conduit;

the end of the conduit is arranged in the light straight-through joint, and the length of the conduit extending into the light straight-through joint is 10-30 mm;

connecting and fixing the light straight-through joint and the guide pipe by using an internal rotation extrusion molding machine, and performing rolling connection molding after assembly;

a flareless-flared structural assembly form comprising:

assembling the flaring-free end of the catheter according to a flaring-free structure assembling form;

assembling a flaring nut on a guide pipe at the flaring end in advance, wherein the flaring nut can axially move outside the guide pipe;

assembling a flat nozzle at the flared end of the catheter, the flat nozzle being capable of moving axially outside the catheter;

and (3) carrying out flaring treatment on the end of the guide pipe by using a flaring forming machine, wherein the distance between the end of the guide pipe and the end surface of the flat nozzle is 0.4-2 mm.

Background

At present, the domestic aircraft pipeline mainly uses a flared pipeline connecting piece.

The flaring pipeline connecting piece is characterized in that two ends of a guide pipe are flared, and the end head of the guide pipe is processed into a certain angle of about 74 degrees through a flaring forming machine. After the flaring treatment is carried out on the end of the conduit, large deformation is generated, cracks are easy to appear, the fatigue performance of the combined conduit is reduced, and the phenomenon of leakage and leakage frequently appears due to the processing error of the flaring in the aspect of sealing performance. Meanwhile, the system pipeline formed by the flared pipeline connecting pieces is poor in rigidity and axial tensile property of the structure, and the pipe is low in ultimate strength, so that the working pressure is low, and the application requirements of all aircraft pipelines cannot be met.

Therefore, it is necessary to upgrade the existing pipeline structure of the aircraft, and avoid the technical defects of the existing flared structure or flareless structure.

Disclosure of Invention

In view of the above, the invention provides a system pipeline based on a rolling type combined conduit and an assembly method thereof, so as to improve the fatigue performance and the sealing performance of the combined conduit, simplify the assembly process flow, increase the connection strength, reduce the abrasion and meet various application requirements of an aircraft pipeline.

To this end, the invention provides a system pipeline based on a rolling combined conduit, comprising:

at least one flareless-flare combination conduit and at least one flareless combination conduit;

the flareless combination catheter includes: a first conduit; the first end of the first conduit is fixed with the first light straight-through joint in a rolling connection mode; the second end of the first guide pipe is an extrusion type structural component, a sealing type structural component, a clamping sleeve type structural component or a rolling type structural component;

the no-flare combination catheter includes: a second conduit; the first end of the second conduit is fixed with the second light straight-through joint in a rolling connection mode, and the second end of the second conduit is assembled with the flat nozzle and the flaring nut in a flaring mode.

Further, the first conduit has a retention step within the first lightweight through-fitting for fixing the length of the first conduit that extends into;

the second conduit has a retention step in the second light straight fitting for fixing the length of the second conduit that extends into.

Further, the threaded end of the first light straight-through joint is outward, and the threaded end is provided with an external thread;

the threaded end of the second light straight-through joint faces outwards, and the threaded end is provided with external threads.

Further, the second end of the second conduit is fitted with a flat nozzle in the form of a 74 ° flare of the conduit, the large end of the flat nozzle facing outward.

Further, the flare nut passes through the second conduit with the threaded end outward, and the threaded end is internally threaded.

Further, the conduit is a fixed length straight conduit, or a curved conduit.

Further, the internal thread is an MJ thread; the external thread is an MJ thread.

Furthermore, the guide pipe is made of titanium alloy or stainless steel, the pipe sleeve is made of stainless steel, and the light straight-through connector is made of titanium alloy or stainless steel.

The invention also provides an assembly method of the system pipeline based on the rolling type combined guide pipe, which adopts a flareless structure assembly form and a flareless-flareless structure assembly form to assemble the combined guide pipe to form the system pipeline;

wherein, flareless formula structure assembly form includes:

assembling a light straight-through joint at the non-flared end of the conduit, wherein the light straight-through joint can axially move at the outer side of the conduit;

the end of the conduit is arranged in the light straight-through joint, and the length of the conduit extending into the light straight-through joint is 10-30 mm;

connecting and fixing the light straight-through joint and the guide pipe by using an internal rotation extrusion molding machine, and performing rolling connection molding after assembly;

a flareless-flared structural assembly form comprising:

assembling the flaring-free end of the catheter according to a flaring-free structure assembling form;

assembling a flaring nut on a guide pipe at the flaring end in advance, wherein the flaring nut can axially move outside the guide pipe;

assembling a flat nozzle at the flared end of the catheter, the flat nozzle being capable of moving axially outside the catheter;

and (3) carrying out flaring treatment on the end of the guide pipe by using a flaring forming machine, wherein the distance between the end of the guide pipe and the end surface of the flat nozzle is 0.4-2 mm.

In the technical scheme of the invention, the connection forms of the pipeline combined guide pipes are increased by various combined guide pipes based on the rolling connection form, the design thought of the pipeline is enriched, because the flaring combined guide pipes are covered, the mutual conversion between the flaring combined guide pipes and the non-flaring combined guide pipes can be carried out, if the combined guide pipes are applied to an aircraft pipeline system, the combined guide pipes have good structural rigidity and axial tensile property, the ultimate strength of the pipes is high, the working pressure of the pipeline system is improved, the problems of leakage and leakage which commonly exist in the existing pipeline system are solved, the sealing property and the fatigue property of the pipeline connection part are improved, the connection form of the combined guide pipes is firm, the assembly form is simple and convenient, the production efficiency of the guide pipes is improved, and the whole weight of the aircraft pipeline can be reduced.

The system pipeline in the technical scheme is suitable for being used due to the characteristics of good rigidity, good sealing performance, good fatigue and vibration resistance and the likeA high pressure line; in particular, the working pressure of the current aircraft pipeline is generally 21MPa, and the working pressure of the combined conduit based on the rolling connection mode can reach 28MPa (the working pressure P is equal to P)_min/4, wherein P_minMinimum burst pressure in MPa; the minimum burst pressure is calculated as follows:

wherein σ_bUltimate strength in MPa; d_NIs the nominal outer diameter of the catheter in mm; d_NIs the nominal inner diameter of the catheter in mm; e.g. of the type_minIs the minimum wall thickness of the catheter (95% of the nominal wall thickness) in mm. ).

In the technical scheme, the sealing connection structure of the pipe sleeve cambered surface and the connector inner cone is simple (as shown in figure 14), the assembly is convenient, and the combined guide pipes of different types can be disassembled and replaced to ensure interchangeability.

In the technical scheme, the sealing principle of the combined conduit based on the rolling connection mode is as follows: the 24-degree rolling type flaring-free connection mode is characterized in that a pipe sleeve and a guide pipe are connected together through rolling to form reliable connection, and an outer sleeve nut is installed to form a combined guide pipe; and then, contacting the 24-degree conical surface of the pipe joint with the cambered surface of the pipe sleeve to form linear sealing, and then screwing the outer sleeve nut on the combined guide pipe in a threaded fit manner with the joint to form tight, continuous and reliable sealing between the pipe sleeve on the combined guide pipe and the joint body. Each point of the sealing cambered surface of the pipe sleeve is tangent to the 24-degree conical surface of the joint, continuous sealing can be realized, high pressure and low pressure are both good in sealing performance, even after pressure relief, a good sealing state can be still kept in the lowest pressure state of a pipeline, and the phenomenon of leakage and leakage is avoided. The seal structure is shown in fig. 14. The titanium alloy sealing ring has the characteristics of high sealing property, self-locking vibration resistance, light weight of titanium alloy materials, long service life and the like.

For the reasons mentioned above, the present invention can be widely applied to the field of pipelines.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a non-flared composite catheter according to an embodiment of the present invention;

FIG. 2 is a schematic view of another embodiment of a flareless composite catheter;

FIG. 3 is a schematic view of another embodiment of a flareless composite catheter;

FIG. 4 is a schematic view of a non-flared composite conduit according to an embodiment of the present invention;

FIG. 5 is a schematic view of an embodiment of a flareless composite catheter;

FIG. 6 is a schematic diagram of a rolled non-flaring combination conduit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a rolled non-flaring combination conduit according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a system pipeline based on a rolled composite conduit according to an embodiment of the present invention;

FIG. 9 is a cross-sectional view of a roll-bonded area of a lightweight through-connection in an embodiment of the present invention;

FIG. 10 is a sectional view of a roll bonded area of a sleeve according to an embodiment of the present invention;

FIG. 11 is a schematic view of a flared catheter assembly in an embodiment of the present invention;

FIG. 12 is a schematic view of an embodiment of the invention illustrating the assembly of a flareless catheter;

FIG. 13 is a schematic structural diagram of a system pipeline based on a rolling combined conduit according to another embodiment of the present invention;

fig. 14 is a schematic view of a sealing structure of a combined conduit based on a rolling connection form in the embodiment of the invention, wherein 1401 is a pipe joint, 1402 is a sleeve nut, 1403 is a pipe sleeve, and 1404 is a conduit.

Detailed Description

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a system pipeline based on a rolling combined conduit, which comprises: at least one flareless-flare combination conduit and at least one flareless combination conduit.

The combined conduit is formed by combining a conduit, a pipe sleeve, a light straight-through joint, a flat pipe nozzle, a flared nut, a non-flared nut and a conduit, can be combined into different forms to be connected and converted with each other, can be in a straight conduit form or an elbow form, and is connected with accessories such as a pump, a valve, a joint and the like to form a pipeline system, so that various application requirements are met. The pipe sleeve or the light straight-through joint is fixed with the catheter in a rolling connection mode, the rolling connection is realized through a special tool and a process method, and the special tool can extend into the inner cavity of the catheter; the flat pipe nozzle and the flared nut are assembled at the flared end of the guide pipe in a flared mode, the flared end of the guide pipe is in a flared shape, the flareless nut is assembled at the flareless end of the guide pipe, and the guide pipe, the pipe sleeve, the light straight-through joint, the flat pipe nozzle, the flared nut and the flareless nut are all assembled at the outer side of the guide pipe.

Specifically, among the no flaring combination pipe, the first end of pipe is connected with light-duty straight joint for the form through the roll extrusion connection, and the pipe second end can be multiple form, like extrusion formula structure subassembly, sealed structure subassembly, cutting ferrule formula structure subassembly or roll extrusion formula structure subassembly to form the no flaring combination pipe of multiple structure:

referring to fig. 1, there is shown a flareless unitized conduit construction in which the conduit second end is a extruded structural assembly in an embodiment of the present invention; the flareless combination catheter 100 includes a catheter tube 101, a lightweight straight-through fitting 102, and a squeeze-type structural assembly 103; the light straight-through joint 102 is fixed with the first end of the guide pipe 101 in a rolling connection mode, the fit clearance between the inner diameter of the light straight-through joint and the outer diameter of the guide pipe is 0.02-0.2 mm, the guide pipe 101 is provided with a limiting step in the light straight-through joint 102 and used for fixing the extending length of the guide pipe 101, and the length of the end head of the first end of the guide pipe 101 extending into the light straight-through joint is 10-30 mm; the threaded end of the light straight-through joint 102 faces outwards, and the threaded end is provided with external threads and is used for being assembled with the internal threads of the nut so as to realize connection with other combined conduits;

the extrusion structural assembly 103 comprises a guide pipe 101, a connector body 103-1 and an extrusion ring 103-2, wherein the second end of the guide pipe 101 is fixedly connected with the connector body 103-1 in an extrusion mode through the extrusion ring 103-2.

Referring to fig. 2, there is shown a flareless unitized conduit construction with the second end of the conduit being a sealed structural component in an embodiment of the present invention; the flareless composite catheter 200 includes a catheter 201, a lightweight feedthrough joint 202, and a sealed structural assembly 203; the light straight-through joint 202 is fixed with the first end of the guide pipe 201 in a rolling connection mode, the fit clearance between the inner diameter of the light straight-through joint and the outer diameter of the guide pipe is 0.02-0.2 mm, the guide pipe 201 is provided with a limiting step in the light straight-through joint 202 and used for fixing the extending length of the guide pipe 201, the length of the end of the guide pipe extending into the light straight-through joint is 10-30 mm, and the light straight-through joint 202 is provided with external threads and used for being assembled with the internal threads of a nut so as to realize connection with other combined guide pipes;

the sealing structure component 203 comprises a connector body 203-1, a nut 203-2, a steel wire 203-3, a sealing end head 203-4 and a guide pipe 201, wherein the second end of the guide pipe 201 is inserted into the sealing end head 203-4 and is fixedly connected with the connector body 203-1 in a sealing mode through the steel wire 203-3 and the nut 203-2.

Referring to fig. 3, a flareless composite conduit structure is shown in which the second end of the conduit is a ferrule-type structural assembly in an embodiment of the present invention; the flareless composite catheter 300 includes a catheter tube 301, a lightweight through-fitting 302, and a ferrule-type structural assembly 303; the light straight-through joint 302 is fixed with the first end of the guide pipe 301 in a rolling connection mode, the fit clearance between the inner diameter of the light straight-through joint and the outer diameter of the guide pipe is 0.02-0.2 mm, the guide pipe 301 is provided with a limiting step in the light straight-through joint 302 and used for fixing the extending length of the guide pipe 301, the length of the end of the guide pipe extending into the light straight-through joint is 10-30 mm, and the light straight-through joint 302 is provided with external threads and used for being assembled with the internal threads of a nut so as to realize connection with other combined guide pipes;

the ferrule type structural assembly 303 comprises a joint 303-1, a ferrule 303-2, a nut 303-3 and a conduit 301, wherein the second end of the conduit 301 is inserted into the ferrule 303-2, and the outer side of the ferrule 303-2 is fixedly connected with the joint 303-1 through the nut 303-3.

Referring to fig. 4, there is shown a non-flared composite conduit structure in which the second end of the conduit is a rolled structural assembly in an embodiment of the invention; the flareless composite catheter 400 includes a catheter 401, a lightweight straight-through fitting 402, and a rolled structural assembly 403; the light straight-through joint 402 is fixed with the first end of the guide pipe 401 in a rolling connection mode, the fit clearance between the inner diameter of the light straight-through joint and the outer diameter of the guide pipe is 0.02-0.2 mm, the guide pipe 401 is provided with a limiting step in the light straight-through joint 402 and used for fixing the extending length of the guide pipe 401, the length of the end of the guide pipe extending into the light straight-through joint is 10-30 mm, and the light straight-through joint 402 is provided with external threads and used for being assembled with the internal threads of a nut so as to realize connection with other combined guide pipes;

the roll-down structural assembly 403 includes: the pipe sleeve 403-1 is fixed with the second end of the guide pipe 401 in a rolling connection mode, the fit clearance between the inner diameter of the pipe sleeve 403-1 and the outer diameter of the guide pipe is 0.02-0.2 mm, and the distance between the end head of the guide pipe and the arc-shaped end head of the pipe sleeve is 1-2 mm; the second end of the guide pipe 401 is provided with a protruding length, a nut 403-2 is arranged on the outer side of the second end of the guide pipe 401, the fit clearance between the inner diameter of the nut 403-2 and the outer diameter of the guide pipe is 0.1-1 mm, a threaded end is arranged on the outer side of the nut 405, and the threaded end is provided with internal threads and is used for being assembled with threads of a connector so as to realize connection with other combined guide pipes.

Referring to fig. 5, there is shown a non-flared composite conduit structure in which the second end of the conduit is a rolled structural assembly in an embodiment of the invention; the flareless composite catheter 500 includes a catheter 501, a lightweight through-fitting 502, and a rolled structural assembly 503; the light straight-through joint 502 is fixed with the first end of the guide pipe 501 in a rolling connection mode, the fit clearance between the inner diameter of the light straight-through joint and the outer diameter of the guide pipe is 0.02-0.2 mm, the guide pipe 501 is provided with a limiting step in the light straight-through joint 502 for fixing the extending length of the guide pipe 501, the length of the end of the guide pipe extending into the light straight-through joint is 10-30 mm, and the light straight-through joint 502 is provided with external threads for assembling with the internal threads of a nut so as to realize connection with other combined guide pipes;

the rolled structural assembly 503 includes: the light straight-through joint 503-1 is fixed with the second end of the guide pipe 501 in a rolling connection mode, the fit clearance between the inner diameter of the light straight-through joint and the outer diameter of the guide pipe is 0.02-0.2 mm, the guide pipe 501 is provided with a limiting step in the light straight-through joint 503-1 and used for fixing the extending length of the guide pipe 501, the length of the end of the guide pipe extending into the light straight-through joint is 10-30 mm, and the light straight-through joint 503-1 is provided with external threads and used for being assembled with the internal threads of a nut so as to achieve connection with other combined guide pipes.

The flareless-flare combination catheter may also be of various configurations.

Referring to fig. 6, a non-flaring and flaring combined conduit structure with a flat nozzle at one end and a pipe sleeve at the other end of the conduit according to the embodiment of the invention is shown; the combined flareless and flare conduit 600 includes a conduit 601, a flareless nut 602, a flare nut 603, a sleeve 604, and a flat nozzle 605; the pipe sleeve 604 is fixed with one end of the guide pipe 601 in a rolling connection mode, the fit clearance between the inner diameter of the pipe sleeve and the outer diameter of the guide pipe is 0.02-0.2 mm, and the distance between the end of the guide pipe and the arc-shaped end of the pipe sleeve is 1-2 mm; the end head of one end of the guide pipe 601 is provided with a protruding length, the outer side of one end of the guide pipe 601 is provided with a non-flaring nut 602, the fit clearance between the inner diameter of the nut and the outer diameter of the guide pipe is 0.1-1 mm, the threaded end of the non-flaring nut 602 faces outwards, and the threaded end is provided with internal threads which are used for being assembled with threads of a connector so as to realize connection with other combined guide pipes; the other end of the guide pipe 601 is assembled with a flat pipe nozzle 605 in a flaring mode of 74 degrees, the flare opening of the flat pipe nozzle and the flare opening of the guide pipe have similar taper degrees which are about 74 degrees, the fit clearance between the inner diameter of the flat pipe nozzle and the outer diameter of the guide pipe is 0.02-0.2 mm, the distance between the end head of the guide pipe and the end face of the flat pipe nozzle is 0.4-4 mm, the outer edge of the other end of the guide pipe 601 has a 0.2-2mm extension length, a flaring nut 603 is arranged on the outer side of the other end of the guide pipe 601, a threaded end is arranged on the outer side of the flaring nut 603, and an internal thread is arranged at the threaded end and used for being assembled with a connector in a threaded mode so as to realize connection with other combined guide pipes.

Referring to fig. 7, a non-flaring combined conduit structure with a flat nozzle at one end and a light straight-through fitting at the other end of the conduit according to an embodiment of the present invention is shown; the rolled combination flareless-flared conduit 700 includes a conduit 701, a flared nut 702, a flat nipple 703, and a lightweight straight-through fitting 704; the light straight-through joint 704 is fixed with one end of a guide pipe 701 in a rolling connection mode, the fit clearance between the inner diameter of the light straight-through joint and the outer diameter of the guide pipe is 0.02-0.2 mm, one end of the guide pipe 701 is provided with a limiting step in the light straight-through joint 704 and used for fixing the extending length of the guide pipe 701, the length of the end of the guide pipe extending into the light straight-through joint is 10-30 mm, the threaded end of the light straight-through joint 704 faces outwards, and the threaded end is provided with external threads and used for being assembled with internal threads of a nut to realize connection with other combined guide pipes; the other end of the guide pipe 701 is assembled with a flat pipe nozzle 703 in a flaring mode of 74 degrees, the flare opening of the flat pipe nozzle and the flare opening of the guide pipe have similar taper degrees which are about 74 degrees, the fit clearance between the inner diameter of the flat pipe nozzle and the outer diameter of the guide pipe is 0.02-0.2 mm, the distance between the end head of the guide pipe and the end face of the flat pipe nozzle is 0.4-4 mm, the outer edge of the other end of the guide pipe 701 has a 0.2-2mm extension length, a flaring nut 702 is arranged on the outer side of the other end of the guide pipe 701, the threaded end of the flaring nut 702 faces outwards, and the threaded end is provided with internal threads which are used for being assembled with the threads of a joint so as to realize connection with other combined guide pipes. The nut internal threads and the light straight-through joint external threads in each combined conduit are MJ threads, the MJ threads are metric symmetrical threads which are special for aerospace structures, have 60-degree thread form angles and have thread tooth bottoms in the shape of a large circular arc, and have high fatigue strength.

The strength difference exists between the guide pipe and the pipe sleeve and between the guide pipe and the light straight-through connector in each combined guide pipe, the strength of the pipe sleeve, the strength of the flat pipe nozzle and the strength of the light straight-through connector are 900-1300 MPa, and the strength of the guide pipe is 600-1000 MPa.

The guide pipe in each combined guide pipe is made of titanium alloy or stainless steel, the pipe sleeve is made of stainless steel, and the light straight-through joint is made of titanium alloy or stainless steel.

The conduit in each combined conduit is a fixed length straight conduit or a bent conduit.

The outer diameter of the catheter in each of the above-mentioned combined catheters is not more than 32 mm.

The rolling connection process has the characteristics of high sealing performance, light weight, shock resistance, self locking, no need of safety, convenience in maintenance and the like, and solves the problem of leakage, leakage and leakage of the high-pressure conduit by utilizing the self-sealing principle that the higher the pressure is, the better the sealing is after the pipe joint is connected with the conduit in a rolling mode.

By combining the above-described flareless combination conduit and the flare-flareless combination conduit, a variety of system lines can be formed.

Example 1

Referring to fig. 8, a schematic structural diagram of a system pipeline based on a rolled composite conduit according to another embodiment of the present invention is shown. The system pipeline 800 provides a hydraulic pipeline carrier for transmitting pressure medium, and ensures the normal implementation of system functions. Meanwhile, the flaring is converted into a non-flaring structure, so that the weight of the system is reduced, the sealing performance of the system is improved, and the design requirements of light weight and high pressure are met. Including the flareless combination catheter 500 shown in fig. 5 and the flare-flareless combination catheter 600 shown in fig. 6.

According to the assembled threaded interface, and then through a conversion joint to form a system pipeline 800, wherein the conduit 81 is made of titanium alloy and is of a mark Ti-3Al-2.5V, the light straight-through joint 82 is made of titanium alloy and is of a mark TC4, the conduit 81 and the light straight-through joint 82 are assembled in a rolling connection mode through a special tool, the rolling connection is shown in figure 9, the pipe sleeve 83 is made of 15-5PH, the conduit 84 is made of 1Cr18Ni10Ti, the pipe sleeve 83 and the conduit 84 are assembled in a rolling connection mode through the special tool, the rolling connection is shown in figure 10, the pipe sleeve 83 and the light straight-through joint 82 are connected in an MJ thread mode through a nut 85, the assembly mode is shown in figure 12, after the flat nozzle 87 and the flared end of the conduit 84 are assembled, the flat nozzle is connected in an MJ thread mode through a flared nut 86, the assembly mode is shown in figure 11, and the like, if the combined conduit in the, the rolled conduit assembly, which is composed of the sleeve and the conduit in a rolled connection form, is seen in fig. 8, the end head is screwed by a 24-degree flareless plug, and finally, the rolled conduit assembly is appropriately combined with other actuating elements and control elements to form a hydraulic system with different functions.

Example 2

Referring to fig. 13, a schematic structural diagram of a system pipeline based on a rolled composite conduit according to another embodiment of the present invention is shown. The system pipeline is an emergency release system pipeline of a certain type, is a system connecting pipeline between an emergency release energy source component and an emergency change-over valve, and has the main functions of providing a hydraulic pipeline carrier for an emergency release energy source system and ensuring the normal implementation of emergency release of the system under the condition that an undercarriage is normally put down and fails.

FIG. 13 illustrates:the guide pipe represents guide pipes with different outer diameter specifications (6-50 mm), and is formed by combining a1 and a2 light straight-through joint components, b1, b2, b3 and b4 variable-diameter straight-through joint components, c1 and c2 three-way joint components and d1 bent straight-through joint components, wherein the guide pipe is formed by combining a plurality of guide pipes with different outer diameters and specifications (6-50 mm)In the case of a flareless composite catheter 400, namely catheter 401, lightweight through-fitting 402 and rolled structural assembly 403,is a flareless composite conduit 500, namely a conduit 501, a lightweight through-fitting 502 and a rolled structural assembly 503,for a combined flared-flareless conduit 600, a conduit 601, a flareless nut 602, a flare nut 603, a tube sleeve 604, and a flat nozzle605 and the rest are rolling structure duct assemblies.

Hydraulic components such as the above aviation hydraulic pipe joints and the components thereof are connected together through pipelines, such as hydraulic pumps, valves, cylinders, oil tanks and the like, to form a hydraulic system.

Corresponding to the system pipeline based on the rolling type combined guide pipe, the embodiment of the invention also provides an assembly method of the system pipeline based on the rolling type combined guide pipe, which adopts a flareless structure assembly form and a flareless-flareless structure assembly form; the flaring-free structure is characterized in that a pipe sleeve or a light straight-through joint is assembled on a guide pipe by using an internal rotation extrusion molding machine, and is subjected to rolling connection molding after assembly, and a flaring-free nut is pre-installed before connection; the flaring structure uses a flaring forming machine to assemble the flat nozzle on the guide pipe, and flaring forming is carried out after assembly, and a flaring nut is preassembled before flaring.

Specifically, the method comprises the following steps:

flareless structural assembly form comprising:

s1, assembling a non-flaring nut on the guide pipe in advance, wherein the non-flaring nut can axially move outside the guide pipe;

s2, assembling a pipe sleeve or a light straight-through connector at the non-flared end of the guide pipe, wherein the pipe sleeve or the light straight-through connector can axially move at the outer side of the guide pipe;

s3, arranging the pipe sleeve at the end of the guide pipe, wherein the distance between the end of the guide pipe and the arc-shaped end of the pipe sleeve is 1-2 mm;

s4, placing the end of the conduit in the light straight-through joint, wherein the length of the conduit extending into the light straight-through joint is 10-30 mm;

and S5, connecting and fixing the pipe sleeve or the light straight-through joint and the guide pipe by using an internal rotation extrusion molding machine, and performing roll extrusion molding after assembly to complete the assembly of the combined guide pipe with the flaring-free structure.

The contact surface of the pipe sleeve part consists of two conical surfaces and a middle cambered surface, the cambered surface is in contact with the conical surface of the joint to play a sealing role, and the contact line is a circle. The joint portion includes a 24 ° taper surface, and when the ferrule is installed in the joint, the sealing surface of the ferrule contacts the taper surface of the joint to achieve a seal, the seal being a line contact, the line of contact being a circle. The nut is used for connecting the pipe sleeve and the joint.

A flareless-flared structural assembly form comprising:

s6, assembling the non-flared end of the catheter according to the non-flared structure assembling mode;

s7, assembling a flaring nut on the guide pipe at the flaring end in advance, wherein the flaring nut can axially move outside the guide pipe;

s8, assembling the flat nozzle at the flared end of the guide pipe, wherein the flat nozzle can axially move outside the guide pipe;

s9, flaring the end of the guide pipe by using a flaring forming machine, wherein the distance between the end of the guide pipe and the end surface of the flat nozzle is 0.4-2 mm, and the assembly of the combined guide pipe with the flaring-free structure is completed.

The flaring nut is assembled on the guide pipe, and the nut is flexible to rotate and not tight; and the flat nozzle can flexibly rotate on the conduit and is not tight.

The flaring-free nut is assembled on the guide pipe, the nut is flexible to rotate and not tight, and the nut is matched with the pipe sleeve without interference.

The gap between the pipe and the pipe sleeve or the light straight-through joint in the rolling connection area is filled after the pipe material is radially expanded and flows along the axial direction of the pipe material, the length difference between the pipe and the pipe sleeve or the light straight-through joint before and after rolling is 0.2-2mm, the pipe and the pipe sleeve or the light straight-through joint are coaxial, obvious deformation does not exist, and the deformation is within 0.2 mm. The rolling area is tapered at 0.5-2 degrees, and the size of the tapered end is equal to the inner diameter of the conduit. The taper starting end of the rolling area is in an annular indentation on the inner wall of the conduit, and the indentation depth is 0.1-1 mm. The annular indentation of the rolling area does not exceed the pipe sleeve, and no obvious convex band exists on the pipe wall at the transition part of the pipe and the pipe sleeve at the exposed edge, namely, the material of the pipe does not extend out of the pipe sleeve.

The rolling connection process has the characteristics of high sealing performance, light weight, shock resistance, self locking, no need of safety, convenience in maintenance and the like, and solves the problem of leakage, leakage and leakage of the high-pressure conduit by utilizing the self-sealing principle that the higher the pressure is, the better the sealing is after the pipe joint is connected with the conduit in a rolling mode.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.