阅读说明：本技术 一种无扩口导管组件及其制造方法 (Non-flared catheter assembly and method of manufacturing the same ) 是由 杨浩志 于 2019-09-03 设计创作，主要内容包括：本发明属于3D打印制造领域,涉及一种无扩口导管组件及其制造方法。该组件包括外套螺母(3)、金属环(2)和导管(1),其中,所述外套螺母(3)上设置有穿丝孔；所述金属环(2)通过所述外套螺母(3)上的穿丝孔固定组装；所述导管(1)通过3D打印形成,并且所述导管的两端设置有限位台,所述限位台与所述金属环配合使得所述导管只能饶中心轴线旋转而不能轴向移动。(The invention belongs to the field of 3D printing and manufacturing, and relates to a flareless catheter assembly and a manufacturing method thereof. The assembly comprises an outer sleeve nut (3), a metal ring (2) and a guide pipe (1), wherein a threading hole is formed in the outer sleeve nut (3); the metal ring (2) is fixedly assembled through a threading hole in the outer sleeve nut (3); the guide pipe (1) is formed by 3D printing, and limiting tables are arranged at two ends of the guide pipe and matched with the metal rings, so that the guide pipe can only rotate around the central axis and cannot move axially.)

1. A flareless catheter assembly is characterized by comprising an outer sleeve nut (3), a metal ring (2) and a catheter (1),

wherein the outer sleeve nut (3) is provided with a threading hole;

the metal ring (2) is fixedly assembled through a threading hole in the outer sleeve nut (3);

the guide pipe (1) is formed by 3D printing, and limiting tables are arranged at two ends of the guide pipe and matched with the metal rings, so that the guide pipe can only rotate around the central axis and cannot move axially.

2. The catheter assembly of claim 1,

the metal ring (2) is an elastic metal ring.

3. A method of manufacturing a flareless catheter assembly, comprising:

the metal ring (2) is arranged in a threading hole of the outer sleeve nut (3);

segmenting a portion of a 3D printing catheter (1);

two outer nuts (3) which are penetrated with metal rings (2) are sleeved into a part of the guide pipe (1) in sequence, and the outer nuts (3) are ensured to freely slide on the part of the guide pipe (1).

Printing a remaining portion of the catheter other than a portion thereof.

4. Method according to claim 3, characterized in that segmenting a portion of the 3D printed catheter (1), in particular comprises: the portion of the catheter containing the tip of one end of the catheter and a straight section of the middle portion was printed.

5. The method of claim 3, further comprising:

and setting parameters of the material, the drift diameter, the wall thickness and the length of the 3D printed catheter (1).

6. The method according to claim 5, characterized in that setting the parameters of material, path, wall thickness, length, etc. of the 3D printed catheter (1) comprises in particular: according to the pressure, temperature and medium parameters used, the material, drift diameter, wall thickness and length parameters of the 3D printed conduit (1) are set.

7. The method of claim 3, further comprising:

the two ends of the 3D printing conduit (1) are machined so as to improve the dimensional accuracy of the ends and the roughness of the arc-shaped sealing surface and ensure the reliability of connection with the external pipe joint (4).

8. The method of claim 3, further comprising:

and connecting the manufactured non-flaring catheter assembly with an external pipe joint (4) to verify the overall use performance of the catheter assembly.

Technical Field

The invention belongs to the field of 3D printing and manufacturing, and relates to a 3D printed non-flaring catheter assembly and a manufacturing method thereof.

Background

At present, the traditional flareless conduit assemblies are mechanically connected by a bundled conduit and a machined pipe joint, the connection is usually in a crimping or welding mode, and leakage often occurs at the joint of the conduit and the end joint or the joint is cracked due to fatigue in the test and use process, so that the pipeline fails.

Disclosure of Invention

The purpose of the invention is as follows: the flaring-free conduit assembly for 3D printing and the manufacturing method thereof are provided, the defects of the existing flaring-free pipeline connection are avoided, and the reliability of the pipeline connection is improved.

The technical scheme of the invention is as follows:

in a first aspect, a flareless catheter assembly is provided, comprising an outer sleeve nut (3), a metal ring (2) and a catheter (1),

wherein the outer sleeve nut (3) is provided with a threading hole;

the metal ring (2) is fixedly assembled through a threading hole in the outer sleeve nut (3);

the guide pipe (1) is formed by 3D printing, and limiting tables are arranged at two ends of the guide pipe and matched with the metal rings, so that the guide pipe can only rotate around the central axis and cannot move axially.

Optionally, the metal ring (2) is a resilient metal ring.

In a second aspect, there is provided a method of manufacturing a flareless catheter assembly, comprising:

the metal ring (2) is arranged in a threading hole of the outer sleeve nut (3);

segmenting a portion of a 3D printing catheter (1);

two outer nuts (3) which are penetrated with metal rings (2) are sleeved into a part of the guide pipe (1) in sequence, and the outer nuts (3) are ensured to freely slide on the part of the guide pipe (1).

Printing a remaining portion of the catheter other than a portion thereof.

Optionally, segmenting a portion of the 3D printing catheter (1), in particular comprising: the portion of the catheter containing the tip of one end of the catheter and a straight section of the middle portion was printed.

Optionally, the method further comprises:

and setting parameters of the material, the drift diameter, the wall thickness and the length of the 3D printed catheter (1).

Optionally, the setting of parameters such as material, diameter, wall thickness, length, etc. of the 3D printed catheter (1) specifically includes: according to the pressure, temperature and medium parameters used, the material, drift diameter, wall thickness and length parameters of the 3D printed conduit (1) are set.

Optionally, the method further comprises:

the two ends of the 3D printing conduit (1) are machined so as to improve the dimensional accuracy of the ends and the roughness of the arc-shaped sealing surface and ensure the reliability of connection with the external pipe joint (4).

Optionally, the method further comprises:

and connecting the manufactured non-flaring catheter assembly with an external pipe joint (4) to verify the overall use performance of the catheter assembly.

The invention has the beneficial effects that: the invention adopts the 3D printing method to manufacture the flaring-free conduit assembly, reduces the process steps of pipeline connection, simplifies the structure, improves the overall service performance of the pipeline, is convenient and reliable for pipeline connection, can be expanded to other aspects such as connection of flaring pipelines, and can be widely applied to the field of pipeline connection of aerospace and the like.

Drawings

Fig. 1 is a 3D printed flareless catheter assembly according to an embodiment of the present invention;

fig. 2 is a schematic illustration of a 3D printed flareless catheter assembly connected to an external tube fitting according to an embodiment of the present invention.

Detailed Description

The design and fabrication techniques of the present invention are described in further detail below with reference to the accompanying drawings.

A 3D printed flareless catheter assembly, characterized in that the flareless catheter assembly comprises a cap nut (3), a metal ring (2) and a 3D printed catheter (1).

The catheter (1) is formed by 3D printing and is printed in sections. By 3D printing the conduit and the conduit end part, the conduit end joint is finally formed into a whole, and the arc-shaped sealing surface of the end joint and the inner conical surface of the outer pipe joint (4) form a sealing position.

The metal ring (2) is fixedly assembled through a threading hole on the outer sleeve nut (3). When the flareless conduit assembly is connected with the external pipe joint (4), the elastic metal ring (2) allows the pipe joint (4) and the 3D printing conduit (1) to be assembled off-axis, so that conduit torsion is eliminated, friction generated by direct contact of the outer sleeve nut and the conduit end is reduced, and sealing force is increased.

The specific manufacturing process is as follows:

1) according to the working conditions of the pipeline, including the used pressure, temperature, medium and other factors, the parameters of the 3D printing conduit (1) such as the material, the drift diameter, the wall thickness, the length and the like are determined.

2) And (3) installing the metal ring (2) into a threading hole of the outer sleeve nut (3), and integrally installing the metal ring when the catheter is printed in a 3D mode.

3) A segmented 3D printing guide pipe (1) is characterized in that one part of the guide pipe is printed firstly, the straight line section of one end of the guide pipe and the middle part of the guide pipe are contained, and then 2 outer nuts (3) penetrating through metal rings (2) are sleeved into the part of the guide pipe in sequence to ensure that the outer nuts (3) slide freely on the straight line section part of the guide pipe. The remaining portion of the catheter is then printed.

4) According to the requirement, two ends of the 3D printing conduit (1) are machined, the size precision of the ends and the roughness of the arc-shaped sealing surface are improved, and the reliability of connection with the external pipe joint (4) is ensured.

5) And connecting the manufactured non-flaring catheter assembly with an external pipe joint (4) to verify the overall use performance of the catheter assembly.