Threaded variable-cavity flexible catheter connector

Abstract

The utility model discloses a thread type flexible conduit connector with a variable cavity, and relates to the technical field of airplane pipeline systems. The locking device comprises a connector, a locking nut and a locking shell, an internal thread in the right side of the locking nut is matched with an external thread on the outer circular surface of the left side of the locking shell; the width of a middle groove of the connector is greater than the sum of the thicknesses of the left pipeline flange and the right pipeline flange in the connector and the inner side of the locking shell; the flexible conduit connector solves the problem that a hoop type flexible conduit connector is limited in use in a narrow space scene, and has the advantages of eliminating pipeline vibration, improving sealing performance, being convenient to mount, dismount and maintain and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft pipeline systems, in particular to a threaded variable cavity flexible conduit connector. Background Art

[0002] The pipeline system is an important part of the aircraft fluid transportation. It is used to transport various fluid media on the aircraft and the engine, and plays an important role in the connection of various aircraft systems. Due to the poor application environment conditions, it requires high sealing and centering properties, resistance to high temperature deformation, thermal shock, resonance, and various impact loads. If oil leakage or air leakage occurs, it will not only lose the thrust of the engine, but also affect the working performance, service life and flight safety of the aircraft and engine accessory systems.

[0003] Traditional aircraft piping systems mostly use rigid hard connections, the main forms of which are flange connections, detachable threaded joint connections, clamp connections, etc.

[0004] 1) Flange connection has a heavy structure, high alignment requirements, no automatic compensation capability in the axial and radial directions, complex installation and maintenance operations, and is extremely inconvenient to use in the field.

[0005] 2) Separable threaded joint connection is a common connection method, which is divided into flared type and non-flared type. The most commonly used flared type is 37° flared, and others include 45°, 60° and double-taper flared. The pipe end is cold-extruded into a bell mouth in advance, and the corresponding nut and sleeve are used together to make the flared cone of the pipe and the cone of the joint close to each other to form a metal contact surface-to-surface seal. Using the sleeve to compress the pipe can avoid stress concentration at the junction of the pipe flared mouth during vibration, disperse the shear stress at the flared mouth, and increase the connection strength. The flared joint is simple to install and easy to align, but proper lubrication must be ensured during installation. The flareless pipe fitting does not require flaring of the pipe, and its biggest structural feature is the 24° inner cone at the fitting end. The flareless connection mainly relies on the direct contact between the 24° inner cone and the spherical or nearly spherical surface to form a line seal, and the sealing line is located in the thicker part of the part to avoid large plastic deformation after repeated disassembly and assembly, which makes the seal unreliable. A section of straight pipe is left between the front end face of the sleeve and the end face of the pipeline to ensure the coaxial relationship between the fitting and the pipeline and avoid bending moment directly acting on the sleeve. The straight pipe section cannot be too long, and a certain gap must be ensured between the pipe end face and the bottom step of the fitting to avoid direct contact between the two and poor contact at the seal. The pressure resistance of the flareless fitting is higher than that of the traditional flared fitting. This type of fitting has higher reliability and can withstand certain vibrations and pressure fluctuations.

[0006] 3) Clamp connection. In fact, the aircraft pipeline has been using clamp connection for several generations. The first generation of pipeline connection uses bulky flange connection, and at least 6 bolts are used to connect the flanges together. The parts are bulky, which increases the weight of the aircraft and is inconvenient to install. The second generation of pipeline connection uses 2 conduits with rubber hoses on the outside, and is connected with 2 clamps. The clamps are composed of hoops, bolts, nuts, sleeves, and washers. The clamp parts are still bulky and inconvenient to install. The third generation of pipeline connection uses conduit connection quick-release clamps. This quick-release clamp is composed of hoops, bolts, nuts, sleeves, washers, clamps, 2 rigid flanges, sealing rings and other parts. The clamp parts are still bulky and inconvenient to install.

[0007] In order to meet the requirements of flexible connection of pipeline system, some aircraft use rubber hose to connect two sections of pipes. At the same time, they use bundling or clamping to solve the sealing of the connection and relatively fix the two sections of pipes. Due to the flexibility of rubber hose, it is relatively convenient to adjust the two sections of pipes connected to each other, with a large degree of freedom. However, the structural weight of this connection form is still relatively large, and the workload is large when bundling or clamping the rubber hose, the operation is difficult, and the use and maintenance are also extremely inconvenient.

[0008] In order to solve the drawbacks of hard connection and traditional flexible conduit connection, and at the same time, to meet the requirements of conduit connection clamps such as "light structure, flexible operation, high sealing, high reliability and easy maintenance", a clamp-type flexible conduit connection form has emerged; this form uses metal parts to replace traditional rubber hoses, and uses O-rings for sealing, which not only ensures the reliability of sealing, but also retains the flexible connection characteristics of the clamp, and has certain axial (3mm-6mm) and radial (0°-3°) compensation capabilities, thus greatly improving the installation performance and maintainability of the conduit connection; the clamp-type flexible conduit connector has become a new generation of conduit connection form, which is lighter in weight, more convenient to use, simpler to operate, and easier to ensure sealing performance. It is the current development direction of flexible conduit connection technology at home and abroad; although the clamp-type flexible conduit connector is easy to use and maintain, it puts forward higher requirements on the installation space of the connection of the connecting pipeline. In scenarios with narrow space, the use of the clamp-type flexible conduit connection is limited.

[0009] Therefore, in order to solve the problem that the clamp-type flexible conduit connector is limited in use in a narrow space, it is necessary to develop a threaded variable cavity flexible conduit connector. Summary of the invention

[0010] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a threaded variable cavity flexible catheter connector.

[0011] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a threaded variable cavity flexible catheter connector, characterized in that: it includes a connector with a middle groove stuck on the left pipe flange and the right pipe flange, a locking nut installed at the left pipe flange, and a locking shell installed at the right pipe flange; the internal thread on the right side of the locking nut matches the external thread on the left outer cylindrical surface of the locking shell; the width of the middle groove of the connector inside the connector and the inner side of the locking shell is greater than the sum of the thickness of the left pipe flange and the right pipe flange.

[0012] In the above technical solution, a bushing is arranged at the left pipe flange, and the bushing is provided with a boss, the left side of the boss matches with the left inner diameter of the locking nut, and the right side of the boss matches with the left inner diameter of the locking shell.

[0013] In the above technical solution, a first clamping ring is provided at the left pipe flange, and a second clamping ring is provided at the right pipe flange; the first clamping ring is located at the right end of the bushing, and a sealing ring is provided between the first clamping ring, the locking housing, the left pipe and the connector;

[0014] The second clamping ring is located in the locking shell, and a sealing ring is arranged between the second clamping ring, the locking shell, the right pipe and the connector.

[0015] In the above technical solution, the outer circumferential surfaces of the locking nut and the locking housing are both provided with knurled surfaces.

[0016] In the above technical solution, the connector is composed of two semicircular parts, one end of the semicircular part is a concave dovetail groove, and the other end is a convex dovetail tooth, and the dovetail groove and the dovetail tooth match.

[0017] In the above technical solution, the depth of the middle groove is greater than the height of the left pipe flange and the right pipe flange.

[0018] In the above technical solution, both the first clamping ring and the second clamping ring are provided with openings.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1) The utility model solves the problem of limited use of clamp-type flexible conduit connectors in scenarios with narrow spaces, and improves the method of using clamps to fasten conduit connectors to a method of using threaded connections; this connection method retains the advantages of the clamp-type flexible connector, which allows a certain amount of expansion and contraction and rotation at each pipe joint, can absorb the deformation of the pipe base (displacement, rotation, etc.), can absorb the thermal expansion and contraction changes of the pipeline caused by temperature changes, does not cause stress in the pipeline, can eliminate pipeline vibration, improve sealing, and is easy to install, disassemble and maintain.

[0021] 2) The utility model reduces the space size requirement of the pipeline connection, is manually installed, reduces the use of tools, and improves the convenience of disassembly and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 Schematic diagram of the structure of the bushing.

[0024] Figure 3 It is a schematic diagram of the structure of the locking nut.

[0025] Figure 4 It is a schematic structural diagram of the first clamping ring.

[0026] Figure 5 A side view of the first retaining ring.

[0027] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0028] Figure 7 It is a schematic diagram of the structure of the sealing ring.

[0029] Figure 8 It is a structural diagram of a semicircular part.

[0030] Fig. 9 It is a side view of a semicircular part.

[0031] Fig.10 for Figure 8 Schematic diagram of the structure in the B direction.

[0032] Fig.11 for Figure 8 Schematic diagram of the structure in the C direction.

[0033] Fig.12 It is a structural schematic diagram of the locking shell.

[0034] Among them, 11-left pipe, 12-right pipe, 2-connector, 21-middle groove, 22-semicircular part, 221-dovetail groove, 222-dovetail tooth, 3-locking nut, 4-locking housing, 5-bushing, 51-boss, 61-first retaining ring, 62-second retaining ring, 7-sealing ring. DETAILED DESCRIPTION

[0035] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0036] Referring to the attached drawings, it can be seen that: a threaded variable cavity flexible conduit connector, characterized in that: it includes a connector 2 with a middle groove 21 stuck on the flange of the left pipe 11 and the flange of the right pipe 12, a locking nut 3 installed at the flange of the left pipe 11, and a locking shell 4 installed at the flange of the right pipe 12; the internal thread on the right side of the locking nut 3 matches the external thread on the left outer cylindrical surface of the locking shell 4, which plays an axial tightening role; the width of the middle groove 21 of the connector 2 inside the connector 2 and the inner side of the locking shell 4 is greater than the sum of the thickness of the flange of the left pipe 11 and the flange of the right pipe 12; there is an adjustable space of 0-6mm between the end faces of the left pipe 11 and the right pipe 12, forming a variable cavity.

[0037] A bushing 5 is arranged at the flange of the left pipe 11, and the bushing 5 is provided with a boss 51. The left side of the boss 51 cooperates with the left inner diameter of the locking nut 3, and the right side of the boss 51 cooperates with the left inner diameter of the locking shell 4. The inner diameter of the bushing 5 is larger than the diameter of the end face flange of the left pipe 11, and the bushing 5 can axially pass through the end face flange of the left pipe 11. The boss 51 plays an axial positioning and guiding role.

[0038] A first clamp ring 61 is provided at the flange of the left pipe 11, and a second clamp ring 62 is provided at the flange of the right pipe 12; the first clamp ring 61 is located at the right end of the bushing 5, and a sealing ring 7 is provided between the first clamp ring 61, the locking housing 4, the left pipe 11 and the connector 2;

[0039] The second clamp ring 62 is located in the locking housing 4, and a sealing ring 7 is arranged between the second clamp ring 62, the locking housing 4, the right pipe 12 and the connector 2;

[0040] The sealing ring 7 is inserted into the position of the pipe ferrule from the pipe end flange. The inner diameter of the sealing ring 7 matches the outer diameter of the pipe ferrule, and the outer diameter of the sealing ring 7 matches the inner diameter of the locking housing 4 to play a sealing role and prevent leakage of the fluid in the pipe.

[0041] The outer circumferential surfaces of the locking nut 3 and the locking housing 4 are both provided with knurled surfaces to increase friction and facilitate disassembly and installation.

[0042] The connector 2 is composed of two semicircular parts 22, one end of the semicircular part 22 is a concave dovetail groove 221, and the other end is a convex dovetail tooth 222. The dovetail groove 221 and the dovetail tooth 222 match. Through the dovetail form, the two semicircular parts 22 can be assembled into a whole, which is convenient for installation and disassembly.

[0043] The depth of the middle groove 21 is greater than the height of the flange of the left pipe 11 and the flange of the right pipe 12, allowing a deviation of 0°-3° between the center lines of the connecting pipes on both sides.

[0044] In order to install from the pipeline flange, the first clamp ring 61 and the second clamp ring 62 are both provided with an opening 63; the inner diameter of the first clamp ring 61 and the second clamp ring 62 is slightly larger than the outer diameter of the sleeve at the end of the pipeline, and the inner diameter of the first clamp ring 61 and the second clamp ring 62 is smaller than the diameter of the pipeline flange; the first clamp ring 61 and the second clamp ring 62 have the same structure.

[0045] In actual use, combined with Figure 1 To illustrate the structure and working principle of the utility model: install the locking nut 3 axially from the flange of the left pipe 11, install the bushing 5 axially from the flange of the left pipe 11, install the first clamping ring 61 on the ferrule of the left pipe 11, and install the sealing ring 7 on the ferrule of the left pipe 11; install the locking housing 4 axially from the flange of the right pipe 11 to the right pipe 11, install the second clamping ring 62 on the ferrule of the right pipe 11, and install the sealing ring 7 on the ferrule of the right pipe 11. Align the left and right pipes, clamp the middle groove 21 of the connector 2 on the flanges of the pipes on both sides at the same time, and clamp the dovetail teeth of the connector 2 into the dovetail groove; screw the locking housing 4 into the locking nut 3.

[0046] The sealing ring 7 is inserted from the pipeline flange to the position of the pipeline ferrule. The inner diameter of the sealing ring 7 matches the outer diameter of the pipeline ferrule, and the outer diameter of the sealing ring 7 matches the inner diameter of the locking housing 4 to play a sealing role and prevent leakage of the fluid in the pipeline.

[0047] The width of the middle groove 21 of the connector 2 is greater than the sum of the thicknesses of the flanges of the left pipe 11 and the right pipe 12, forming an axially variable cavity with a certain axial (0mm-6mm) compensation capability; the depth of the middle groove 21 is greater than the height of the flanges of the left pipe 11 and the right pipe 12, allowing a deviation of 0°-3° in the center lines of the connected pipes on both sides, with radial compensation capability.

[0048] Other parts not described belong to the prior art.

Claims

1. A threaded variable lumen flexible catheter connector, characterized in that: The invention comprises a connector (2) with a middle groove (21) clamped on a flange of a left pipe (11) and a flange of a right pipe (12), a locking nut (3) installed at the flange of the left pipe (11), and a locking shell (4) installed at the flange of the right pipe (12); the internal thread on the right side of the locking nut (3) matches the external thread on the left side outer cylindrical surface of the locking shell (4); the width of the middle groove (21) of the connector (2) is greater than the sum of the thickness of the flange of the left pipe (11) and the flange of the right pipe (12).

2. A threaded variable lumen flexible conduit connector according to claim 1, characterized in that: A bushing (5) is provided at the flange of the left pipe (11), and the bushing (5) is provided with a boss (51). The left side of the boss (51) matches with the left inner diameter of the locking nut (3), and the right side of the boss (51) matches with the left inner diameter of the locking shell (4).

3. A threaded variable lumen flexible conduit connector according to claim 2, characterized in that: A first clamping ring (61) is provided at the flange of the left pipe (11), and a second clamping ring (62) is provided at the flange of the right pipe (12); the first clamping ring (61) is located at the right end of the bushing (5), and a sealing ring (7) is provided between the first clamping ring (61), the locking housing (4), the left pipe (11) and the connector (2); The second clamping ring (62) is located inside the locking housing (4), and a sealing ring (7) is arranged between the second clamping ring (62), the locking housing (4), the right pipe (12) and the connector (2).

4. A threaded variable lumen flexible conduit connector according to claim 1, characterized in that: The outer circumferential surfaces of the locking nut (3) and the locking housing (4) are both provided with knurled surfaces.

5. A threaded variable lumen flexible conduit connector according to claim 1, characterized in that: The connector (2) is composed of two semicircular parts (22), one end of the semicircular part (22) is a concave dovetail groove (221), and the other end is a convex dovetail tooth (222), and the dovetail groove (221) and the dovetail tooth (222) are matched.

6. A threaded variable lumen flexible conduit connector according to claim 5, characterized in that: The depth of the middle groove (21) is greater than the height of the flange of the left pipeline (11) and the flange of the right pipeline (12).

7. A threaded variable lumen flexible conduit connector according to claim 3, characterized in that: The first clamping ring (61) and the second clamping ring (62) are both provided with openings (63).

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