Welded composite conduit structure for high pressure piping systems

Abstract

The utility model relates to aviation hydraulic system pipeline connection technical field especially relates to a kind of welded combined conduit structure for high-pressure pipeline system.The utility model includes: outer sleeve nut, pipe joint, pipe material and plug;Two ends of pipe material are each fixedly equipped with one pipe joint;Two pipe joints are equipped with outer sleeve nut for being connected with the connecting joint component of plug or pipe material for connecting use.The technical scheme of the utility model solves the problem that the hydraulic pipeline in the prior art usually exists "run, leak, drip, leak" under high pressure environment.

Description

Technical Field

[0001] This utility model relates to the field of aviation hydraulic system pipeline connection technology, and in particular to a welded combined conduit structure for high-pressure pipeline systems. Background Technology

[0002] With the rapid development of the national aviation industry, higher requirements have been placed on the safety performance of aircraft operations, among which the safety and reliability of aviation power systems are extremely important. Aviation hydraulic pipe fittings, as important components of aviation power systems, connect to pumps, valves, cylinders, and other hydraulic components through pipelines to form the aircraft hydraulic system, and are the most widely distributed hydraulic components. For hydraulic pipeline systems, higher working pressure can effectively reduce the piston diameter, and under the same power conditions, the higher the working pressure, the lower the flow rate requirement. Therefore, the size and weight of the entire hydraulic system decrease with increasing pressure, enabling aircraft and engines to have a higher thrust-to-weight ratio and superior overall flight performance. However, because the hydraulic pipelines of aircraft and engines are usually in a high-pressure environment, the sealing of high-pressure pipeline systems has long been plagued by leaks and spills.

[0003] To address the problems existing in the prior art, a novel welded combined conduit structure for high-pressure pipeline systems is designed to overcome these issues. Summary of the Invention

[0004] The existing hydraulic pipelines described above typically suffer from "running, leaking, and dripping" problems under high-pressure environments. Therefore, a welded combined conduit structure for high-pressure pipeline systems is provided.

[0005] The technical means adopted in this utility model are as follows: A welded composite conduit structure for a high-pressure pipeline system includes: an outer nut, a pipe fitting, a pipe, and a plug; Furthermore, a pipe fitting is fixedly installed at each end of the pipe; Furthermore, both pipe fittings are equipped with outer nuts for connection with plugs and pipe connection components.

[0006] Furthermore, the outer nut has a rotating body structure with a through hole inside; Furthermore, the front end of the through hole is machined with an internal thread for connecting with a plug or a pipe fitting, and the rear end is machined with an inclined step for mating with a pipe fitting. Furthermore, the outer end of the outer nut is provided with a six-sided flange structure A for easy engagement with an installation wrench and to provide support strength.

[0007] Furthermore, the pipe fitting has a cylindrical rotating structure, and its left end is machined with a self-sealing structure; Furthermore, the left end face of the self-sealing structure is machined with a double-tapered inclined surface structure composed of a first inclined surface and a second inclined surface; Furthermore, there is a certain angle difference between the first inclined surface and the second inclined surface, so as to ensure that when the first inclined surface and the second inclined surface come into contact with the outer inclined surface of the plug and the pipe connection joint component, they together form a sealing contact pair to ensure the sealing performance after assembly. Furthermore, an elastic tooth with a certain thickness is provided adjacent to the second inclined surface to ensure a certain rigidity; Furthermore, an annular groove is machined on the inner side of the elastic tooth. In a fluid environment, the annular groove is filled with high-pressure fluid and squeezes the elastic tooth, causing the elastic tooth to undergo elastic deformation. This causes the second inclined surface to squeeze the outer inclined surface of the plug or pipe connection joint component, forming a high contact pressure on the surface of the sealing contact pair, thus improving the sealing performance. Furthermore, the outer diameter A of the self-sealing structure is clearance-fitted with the through hole of the outer nut, thereby ensuring the smooth installation of the outer nut; Furthermore, the right side of the outer diameter A is machined with a bevel A for engaging with the inclined step of the outer nut; under the action of tightening force, the bevel can better position the outer nut, ensuring that the internal thread of the outer nut is closely connected with the pipe connection joint component, thereby improving the sealing performance; Furthermore, the tail of the pipe fitting has a groove, the inner diameter of which is consistent with the outer diameter of the pipe, which facilitates positioning and welding assembly with the pipe. Furthermore, the pipe fitting has an axially oriented hole with an inner diameter that matches the inner diameter of the pipe, facilitating the flow of oil.

[0008] Furthermore, the outer diameter B and inner diameter of the pipe are consistent with the inner diameter of the groove and the inner diameter of the hole, respectively. The assembly and connection with the pipe are completed through welding, ensuring the connection strength and sealing performance after connection.

[0009] Furthermore, the plug has a rotating structure, and its left end face is machined with a beveled surface B with a certain taper. Under the action of tightening torque, it comes into contact with the self-sealing structure of the pipe joint to form a contact surface and improve the sealing performance. Furthermore, the outer end face of the plug is machined into a threaded structure, which is then assembled and connected with the outer nut under the action of tightening torque; Furthermore, the right side of the threaded structure is a relief groove; Furthermore, the right side of the relief groove features a six-sided flange structure B, designed to provide support strength for easy engagement with a wrench.

[0010] The assembly process of this utility model is as follows: First, the outer nut is placed on the pipe. Then, the outer diameter of the pipe is aligned with the groove structure of the pipe fitting and embedded into the groove structure. The pipe and pipe fitting are then assembled and fixed by welding. The plug is then brought into contact with the pipe fitting and connected by threads. Under a certain tightening torque, the bevel of the pipe fitting can better position the outer nut, ensuring a close connection between the internal thread of the outer nut and the external thread of the plug. At this time, the first and second bevels in the self-sealing structure of the pipe fitting come into contact with the outer bevel of the plug. Under a certain thread preload, they together form a sealing contact pair, ensuring the sealing performance after assembly. Simultaneously, the annular groove at the front end of the pipe fitting, filled with high-pressure fluid, squeezes the elastic teeth, thereby driving the second bevel to squeeze the outer bevel of the plug, further increasing the contact stress on the sealing contact surface. This creates a high contact pressure on the surface of the sealing contact pair, ensuring excellent sealing performance with no leakage at a maximum working pressure of 35MPa.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The welded combined conduit structure for high-pressure pipeline systems provided by this utility model has pressure resistance: the grooved structure of the pipe joint is assembled and connected to the pipe material through a welding process, ensuring the connection strength and sealing performance after connection, thereby improving the system pressure rating. No leakage or damage will occur within a pressure rating of 35MPa. 2. The welded combined conduit structure for high-pressure pipeline systems provided by this utility model has good anti-loosening properties: the beveled feature of the pipe joint can better position the outer nut under tightening force, and the outer nut sleeve and the plug are closely connected by threads. Under a certain thread preload, the reliability of the assembly connection can be guaranteed, and it has good anti-loosening properties. 3. The welded combined conduit structure for high-pressure pipeline systems provided by this utility model has excellent sealing performance: the front end face of the pipe joint and the end face of the straight connector form a pair of sealing contacts, and the front groove of the pipe joint is filled with high-pressure liquid to cause the sealing teeth to undergo elastic deformation, forming high contact pressure on the surface of the sealing contact pair, thus ensuring excellent sealing performance.

[0012] In summary, the technical solution of this utility model solves the problem of "running, leaking, dripping, and seeping" in existing hydraulic pipelines under high pressure. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the outer nut structure of this utility model; Figure 3 This is a schematic diagram of the pipe connector structure of this utility model; Figure 4 This is an enlarged view of the self-sealing structure of the pipe connector of this utility model; Figure 5 This is a schematic diagram of the pipe structure of this utility model; Figure 6 This is a schematic diagram of the plug structure of this utility model.

[0015] In the diagram: 1. Outer nut; 11. Through hole; 12. Internal thread; 13. Hexagonal flange structure A; 2. Pipe fitting; 21. Self-sealing structure; 22. First inclined surface; 23. Second inclined surface; 24. Elastic tooth; 25. Annular groove; 26. Outer diameter A; 27. Inclined surface A; 28. Groove; 29. ​​Hole; 3. Pipe; 31. Outer diameter B; 32. Inner diameter; 4. Plug; 41. Inclined surface B; 42. Threaded structure; 43. Relief groove; 44. Hexagonal flange structure B. Detailed Implementation

[0016] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0023] like Figure 1 As shown, this utility model provides a welded combined conduit structure for a high-pressure pipeline system, including: an outer nut 1, a pipe joint 2, a pipe 3, and a plug 4; a pipe joint 2 is fixedly assembled at each end of the pipe 3; the two pipe joints 2 are equipped with outer nuts 1 for connecting with the plug 4 and the pipe connection joint components.

[0024] like Figure 2 As shown, the outer nut 1 is a rotating structure with a through hole 11 inside; the front end of the through hole 11 is machined with an internal thread 12 for connecting with one of the plug 4 and the pipe connection joint component, and the rear end is machined with an inclined step for cooperating with the pipe joint 2; the outer tail end of the outer nut 1 is provided with a hexagonal flange structure A13 for easy cooperation with the installation wrench and to provide support strength.

[0025] like Figure 3 , 4 As shown, the pipe connector 2 is a cylindrical rotating structure with a self-sealing structure 21 machined at its left end. The left end face of the self-sealing structure 21 has a double-tapered inclined surface structure composed of a first inclined surface 22 and a second inclined surface 23. A certain angle difference exists between the first inclined surface 22 and the second inclined surface 23, ensuring that when the first inclined surface 22 and the second inclined surface 23 contact the plug 4 and the outer inclined surface of the pipe connection component, they form a sealing contact pair, guaranteeing the sealing performance after assembly. An elastic tooth 24 with a certain thickness is provided adjacent to the second inclined surface 23 to ensure a certain rigidity. An annular groove 25 is machined on the inner side of the elastic tooth 24. In a fluid environment, the annular groove 25, filled with high-pressure fluid, squeezes the elastic tooth 24, causing it to deform elastically, thereby driving the second inclined surface 23 to squeeze the plug. The outer end bevel of the pipe connector 4 or pipe joint component forms a high contact pressure on the surface of the sealing contact pair, improving the sealing performance; the outer diameter A26 adjacent to the self-sealing structure 21 is clearance-fitted with the through hole 11 of the outer nut 1, thereby ensuring the smooth installation of the outer nut 1; the right side of the outer diameter A26 is machined with a bevel A27 for fitting with the inclined step of the outer nut 1; under the action of tightening force, the bevel 27 can better position the outer nut 1, ensuring that the internal thread 12 of the outer nut 1 is closely connected with the pipe joint component, thereby improving the sealing performance; the tail of the pipe joint 2 has a groove 28, the inner diameter of which is consistent with the outer diameter of the pipe 3, which facilitates the positioning welding assembly with the pipe 3; the pipe joint 2 has an axial hole 29, the inner diameter of which is consistent with the inner diameter of the pipe 3, which facilitates the flow of oil.

[0026] like Figure 5 As shown, the outer diameter B31 and inner diameter 32 of the pipe 3 are the same as the inner diameter of the groove 28 and the inner diameter of the hole 29, respectively.

[0027] like Figure 6As shown, the plug 4 is a rotating structure with a tapered bevel B41 machined on its left end face. Under the action of tightening torque, it contacts the self-sealing structure 21 of the pipe joint 2 to form a contact surface and improve the sealing performance. The outer end face of the plug 4 is machined into a threaded structure 42, which is assembled and connected with the outer nut 1 under the action of tightening torque. The right side of the threaded structure 42 is a relief groove 43. The right side of the relief groove 43 is a hexagonal flange structure B44, which facilitates the use of an installation wrench and provides support strength.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A welded combined conduit structure for high-pressure pipeline systems, characterized in that: The welded combined conduit structure for high-pressure pipeline systems includes: an outer nut (1), a pipe fitting (2), a pipe (3), and a plug (4). A pipe fitting (2) is fixedly assembled at each end of the pipe (3); The two pipe fittings (2) are equipped with outer nuts (1) for connecting with plugs (4) and pipe connection fittings.

2. The welded combined conduit structure for high-pressure pipeline systems according to claim 1, characterized in that: The outer nut (1) is a rotating body structure with a through hole (11) inside. The front end of the through hole (11) is machined with an internal thread (12) for connecting with one of the plug (4) and the pipe connection joint component, and the rear end is machined with an inclined step for cooperating with the pipe joint (2); The outer end of the outer nut (1) is provided with a six-sided flange structure A (13) that facilitates the use of an installation wrench and provides support strength.

3. The welded combined conduit structure for high-pressure pipeline systems according to claim 1, characterized in that: The pipe joint (2) is a cylindrical rotating body structure, and its left end is machined with a self-sealing structure (21). The left end face of the self-sealing structure (21) is machined with a double-tapered inclined surface structure composed of a first inclined surface (22) and a second inclined surface (23); There is an angle difference between the first inclined surface (22) and the second inclined surface (23), thereby ensuring that when the first inclined surface (22) and the second inclined surface (23) contact the plug (4) and the outer inclined surface of the pipe connection joint component, they together form a sealing contact pair to ensure the sealing performance after assembly; An elastic tooth (24) with a certain thickness is provided adjacent to the second inclined surface (23) to ensure a certain rigidity; The inner side of the elastic tooth (24) is machined with an annular groove (25); The outer diameter A (26) of the self-sealing structure (21) is clearance-fitted with the through hole (11) of the outer nut (1), thereby ensuring the smooth installation of the outer nut (1); The outer diameter A (26) is machined with a bevel A (27) on the right side for engaging with the inclined step of the outer nut (1). The tail of the pipe fitting (2) has a groove (28), the inner diameter of which is consistent with the outer diameter of the pipe (3), which facilitates the positioning and welding assembly with the pipe (3); The pipe fitting (2) has an axially set hole (29) with an inner diameter that is consistent with the inner diameter of the pipe (3) to facilitate the flow of oil.

4. The welded combined conduit structure for high-pressure pipeline systems according to claim 1, characterized in that: The outer diameter B (31) and inner diameter (32) of the pipe (3) are consistent with the inner diameter of the groove (28) and the inner diameter of the hole (29), respectively.

5. The welded combined conduit structure for high-pressure pipeline systems according to claim 1, characterized in that: The plug (4) is a rotating body structure, and its left end face is machined with a beveled surface B (41) with a certain taper. The outer end face of the plug (4) is machined into a threaded structure (42), and under the action of tightening torque, it is assembled and connected with the outer nut (1); The right side of the threaded structure (42) is a relief groove (43); The right side of the aforementioned relief groove (43) is provided with a six-sided flange structure B (44) for easy matching with the installation wrench and to provide support strength.

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