Radial extrusion connecting pipe fitting for hydraulic pipe

Abstract

The radial extrusion connecting pipe fitting for the hydraulic pipe comprises a pipe sleeve and a sealing ring, the pipe sleeve is of a bilateral symmetry structure, an annular sealing groove is formed in the inner wall of the pipe sleeve, the outer surfaces of the left end and the right end of the pipe sleeve are conical surfaces, the outer surface of the middle of the pipe sleeve is a cylindrical surface, and an annular groove is formed between the conical surfaces of the left end and the right end of the pipe sleeve and the cylindrical surface of the middle. A plurality of tangent planes are formed on the conical surfaces at the left end and the right end and the transition surfaces of the conical surfaces and the annular grooves through a material removing method, and the tangent planes are planes which are uniformly distributed in the circumferential direction of the pipe sleeve and are parallel to the axial central axis of the pipe sleeve; the sealing ring is embedded in the annular sealing groove in the inner wall of the pipe sleeve. By means of the hydraulic pipeline connector, quick connection of the hydraulic system pipelines of the airplane is achieved, and the purposes of reducing the number of hydraulic pipeline connector parts, improving assembly work efficiency and meeting the requirements for light weight and reliability of the airplane are achieved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, specifically to a radially extruded connecting pipe suitable for aircraft hydraulic system pipelines. Background Technology

[0002] Currently, the main connection structures for aircraft hydraulic system pipelines include flared joints, internally compressed non-flared joints, internally rolled non-flared joints, and axially compressed joints. Due to the large number of parts (flared and non-flared joint structures generally consist of 5 parts, while axially compressed joint structures generally consist of 3 parts), low reliability, and large weight, and the need for pre-assembly before onboard assembly, the operation steps are not only cumbersome and the work efficiency is low, but also cannot meet the requirements of aircraft lightweighting and reliability. Utility Model Content

[0003] This utility model provides a hydraulic pipeline directional extrusion connection fitting, which aims to achieve rapid connection of aircraft hydraulic system pipelines through the cooperation of the sleeve and sealing ring structure, thereby reducing the number of hydraulic pipeline joint parts, improving assembly efficiency, and meeting the requirements of aircraft lightweighting and reliability.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A hydraulic pipe directional extrusion connection fitting includes a sleeve and a sealing ring. The sleeve has a symmetrical structure with an annular sealing groove on its inner wall. The outer surfaces of the left and right ends of the sleeve are conical surfaces, and the outer surface of the middle part of the sleeve is a cylindrical surface. An annular groove is provided between the conical surfaces of the left and right ends and the cylindrical surface of the middle part of the sleeve. Several cross-sections are formed on the conical surfaces of the left and right ends and the transition surfaces with the annular grooves by removing material. The cross-sections are planes that are evenly arranged along the circumference of the sleeve and parallel to its axial central axis. The sealing ring is embedded in the annular sealing groove on the inner wall of the sleeve.

[0006] The hydraulic pipe path is a directional extrusion connecting pipe fitting. The cut surfaces of the pipe sleeve are evenly arranged in six groups along the circumference, forming a triangular outline at the joint between the cut surfaces and the outer surface of the pipe sleeve.

[0007] The hydraulic pipe path is oriented to extrude connecting pipe fittings, the number of annular sealing grooves on the inner wall of the pipe sleeve is at least four sets, with at least two sets arranged on the left and right sides of the inner wall of the pipe sleeve; the number of sealing rings is at least two sets, with at least one set arranged in the annular sealing grooves on the left and right sides.

[0008] The above-mentioned hydraulic pipe path is a directional extrusion connecting pipe fitting, wherein the inner diameter of the sealing ring is larger than the outer diameter of the matching conduit, and the hardness of the sealing ring is 54A to 60A.

[0009] The aforementioned hydraulic pipe path is connected to the extrusion fitting, and a corrosion-resistant coating is applied to the outer surface of the pipe sleeve and the inner surface at both ends.

[0010] This utility model provides a hydraulic pipeline directional extrusion connection fitting. The sleeve in this fitting is manufactured through machining, and the sealing ring is directly solidified in the annular sealing groove on the inner wall of the machined sleeve, thereby reducing the number of parts and the overall weight of the connection fitting. The outer surface of the sleeve is designed as a conical surface at both ends and a cylindrical surface in the middle, with an annular groove structure between the conical and cylindrical surfaces. Several cross-sections are formed on the conical surfaces at both ends and the transition surfaces with the annular groove by removing material. Therefore, when using this hydraulic pipeline directional extrusion connection fitting to connect hydraulic pipelines, the sleeve can be radially deformed by a special external extrusion tool. The annular groove structure on the outer surface of the sleeve absorbs the axial displacement of the material during the extrusion deformation process, and the cross-section structure absorbs the circumferential displacement of the material during the extrusion deformation process, thereby achieving a reliable connection between adjacent pipeline sections. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the hydraulic pipe path extrusion connection pipe structure of the present invention;

[0012] Figure 2 yes Figure 1 Main sectional view;

[0013] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure of AA (enlarged);

[0014] Figure 4 This is a schematic diagram of the cross-sectional structure of the sleeve of the hydraulic pipe path extrusion connection fitting;

[0015] Figure 5 , Figure 6 This is a schematic diagram of the assembly process of hydraulic pipe path extrusion connection fittings and conduits.

[0016] Explanation of each label in the diagram:

[0017] 1 is the sleeve, 1-1 is the conical surface, 1-2 is the tangent surface, 1-3 is the annular groove, 1-4 is the cylindrical surface, and 1-5 is the annular sealing groove;

[0018] 2 is a sealing ring;

[0019] 3 is a catheter. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] See Figure 1. Figure 2 , Figure 4 This utility model provides a hydraulic pipeline directional extrusion connection fitting, particularly suitable for connecting pipelines in aircraft hydraulic systems. It includes a sleeve 1 and a sealing ring 2. The sleeve 1 has a symmetrical structure with four sets of annular sealing grooves 1-5 on its inner wall. The outer surfaces of the left and right ends of the sleeve 1 are conical surfaces 1-1, and the outer surface of the middle part of the sleeve 1 is a cylindrical surface 1-4. An annular groove 1-3 is provided between the conical surfaces 1-1 at the left and right ends and the cylindrical surface 1-4 in the middle part of the sleeve 1. Several cross-sections 1-2 are formed on the conical surfaces 1-1 at the left and right ends and on the transition surfaces with the annular grooves 1-3 by material removal. The cross-sections 1-2 are planes evenly arranged along the circumference of the sleeve and parallel to its axial central axis. A corrosion-resistant coating is applied to the outer surface of the sleeve 1 and the inner surface at both ends. The sealing ring 2 is solidified in the annular sealing grooves 1-5 on the inner wall of the sleeve 1 by injecting dimethylsiloxane compound raw material. The number of sealing rings 2 is at least two sets, with at least one set arranged in each of the annular sealing grooves 1-5 on the left and right sides. The inner diameter of the sealing ring 2 is larger than the outer diameter of the matching conduit, and the hardness of the sealing ring 2 is 54A to 60A.

[0022] See Figure 2 , Figure 3 In a preferred embodiment of the hydraulic pipe directional extrusion connecting pipe of the present invention, the cut surfaces 1-2 of the sleeve 1 are evenly arranged in six groups along the circumference, forming a triangular outline at the junction of the cut surfaces 1-2 and the outer surface of the sleeve 1.

[0023] See Figure 5 , Figure 6 The hydraulic pipeline directional extrusion connecting fitting of this utility model has a sleeve 1 with a structure of conical surfaces 1-1 at both ends and a cylindrical surface 1-4 in the middle. An annular groove 1-3 is provided between the conical surfaces 1-1 and the cylindrical surface 1-4. Several cross-sections 1-2 are formed on the conical surfaces 1-1 at both ends and the transition surfaces with the annular grooves 1-3 by removing material. Therefore, when using this hydraulic pipeline directional extrusion connecting fitting to connect the conduits 3 in the hydraulic pipeline, the two conduits 2 to be connected are inserted into the designated positions from both ends of the sleeve 1. Then, the sleeve 1 is radially contracted and deformed by a special external extrusion tool. The annular groove 1-3 structure on the outer surface of the sleeve absorbs the axial displacement of the material during the extrusion deformation process, and the cross-sections 1-2 structure on the outer surface of the sleeve absorb the circumferential displacement of the material during the extrusion deformation process, thereby realizing a reliable connection between the conduits 3 in the adjacent pipeline sections.

[0024] See Figure 1 , Figure 2 , Figure 3 , Figure 4In the manufacturing process of the hydraulic pipe directional extrusion connection fitting described in this utility model, the pipe sleeve machining process is completed first, and then the sealing ring is cured in the annular sealing groove on the inner wall of the pipe sleeve. The specific operation steps are as follows:

[0025] a. Material preparation: Based on the material of the conduit in the hydraulic pipeline, the raw material for sleeve 1 can be aluminum alloy, stainless steel, or titanium alloy rods. When the conduit material is 0Cr21Ni6Mn9N stainless steel, Ti-3Al-2.5V titanium alloy, or 6061-T6 aluminum alloy, the raw material for sleeve 1 is 0Cr21Ni6Mn9N stainless steel rod, which is passivated after the sleeve 1 part is machined. When the conduit material is Ti-3Al-2.5V titanium alloy, the raw material for sleeve 1 is TA3 titanium alloy rod. When the conduit material is 6061-T4 aluminum alloy or 6061-T6 aluminum alloy, the raw material for sleeve 1 is 6061-T6 aluminum alloy rod. After selecting the above raw material, cut to the set length.

[0026] b. Rough machining: The outer surface of the sleeve is rough machined using a lathe. The lathe spindle speed, tool feed rate, and depth of cut are set as follows for different workpiece materials:

[0027] Then, the inner hole of the sleeve is rough-bored using a boring machine. The boring machine spindle speed, tool feed rate, and depth of cut are set as follows for different workpiece materials:

[0028] c. Finishing: The outer surface of the sleeve is finished using a lathe. The lathe spindle speed, tool feed rate, and depth of cut are set according to different workpiece materials as follows:

[0029] Then, the inner hole of the sleeve is precision-bored using a boring machine. The boring machine spindle speed, tool feed rate, and depth of cut parameters are set as follows for workpieces of different materials:

[0030] d. Sealing ring curing: The sealing ring compound material is injected into the annular sealing groove 1-5 of the sleeve 1 using a special tool and heated to cure, forming the sealing ring 2. The sealing ring compound material is dimethylsiloxane liquid and crosslinking agent, with a ratio of 5:1 to 20:1. Depending on the different ratios of the compound material and crosslinking agent, the curing temperature can be selected from 40℃ to 100℃, and the curing time can be selected from 1 to 10 hours.

[0031] e. Machining the cut surfaces: Using a milling machine, machine the cut surfaces 1-2 one by one along the circumference of the sleeve.

[0032] f. Apply a corrosion-resistant coating. Apply a polytetrafluoroethylene coating to the outer surface of the sleeve 1 and the inner surface at both ends.

Claims

1. A hydraulic pipe path directional extrusion connection fitting, characterized in that: The sleeve (1) includes a sleeve (1) and a sealing ring (2). The sleeve (1) has a symmetrical structure and an annular sealing groove (1-5) is provided on its inner wall. The outer surfaces of the left and right ends of the sleeve (1) are conical surfaces (1-1), and the outer surface of the middle part of the sleeve (1) is a cylindrical surface (1-4). An annular groove (1-3) is provided between the conical surfaces (1-1) at the left and right ends of the sleeve (1) and the cylindrical surface (1-4) in the middle part. Several cut surfaces (1-2) are formed on the conical surfaces (1-1) at the left and right ends and the transition surfaces with the annular groove (1-3) by removing material. The cut surfaces (1-2) are planes that are evenly arranged along the circumference of the sleeve and parallel to its axial central axis. The sealing ring (2) is embedded in the annular sealing groove (1-5) on the inner wall of the sleeve (1).

2. The hydraulic pipe path directional extrusion connecting pipe fitting according to claim 1, characterized in that: The cut surfaces (1-2) of the sleeve (1) are evenly arranged in six groups along the circumference, forming a triangular outline at the junction of the cut surfaces (1-2) and the outer surface of the sleeve (1).

3. The hydraulic pipe path directional extrusion connecting pipe fitting according to claim 1 or 2, characterized in that: The number of annular sealing grooves (1-5) on the inner wall of the sleeve (1) is at least four sets, with at least two sets arranged on the left and right sides of the inner wall of the sleeve (1); the number of sealing rings (2) is at least two sets, with at least one set arranged in the annular sealing grooves (1-5) on the left and right sides.

4. The hydraulic pipe path directional extrusion connecting pipe fitting according to claim 3, characterized in that: The inner diameter of the sealing ring (2) is larger than the outer diameter of the matching conduit, and the hardness of the sealing ring (2) is 54A to 60A.

5. The hydraulic pipe path directional extrusion connecting pipe fitting according to claim 4, characterized in that: A corrosion-resistant coating is applied to the outer surface of the sleeve (1) and the inner surface at both ends.

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