Combined catheter with spherical joint

Abstract

The combined type guide pipe is formed by assembling three sets of guide pipes and two sets of spherical joints, the guide pipes and the spherical joints are welded and connected at intervals, each spherical joint is composed of a long connecting pipe, an inner spherical hinge, a sealing ring, a protective cover, an outer spherical hinge, a corrugated pipe, an outer support and a short connecting pipe, and the two ends of the corrugated pipe are connected with the long connecting pipe and the short connecting pipe respectively. The protective cover is connected with the long connecting pipe, the outer support is connected with the short connecting pipe, the overall appearance is of a spherical structure, the sealing ring is installed between the inner spherical hinge and the outer spherical hinge, the combined type guide pipe is of the redundancy design of a spherical joint, and the combined type guide pipe is suitable for an aircraft high-pressure pneumatic pipeline system with the requirements for high reliability, minimum pressure drop, high temperature, high pressure and high dynamic damping characteristics. According to the utility model, axial or radial offset generated by heating and pressure disturbance of a pipeline system can be compensated, so that the two straight pipes can be not on the same straight line, the connection strength and the sealing performance of the pipeline can be greatly improved, the installation mode is simple, and the application scene is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline connection, and particularly discloses a combined catheter with a spherical joint. Background Art

[0002] In the aircraft inerting system, the working medium introduced from the gas source system is usually high-temperature and high-pressure gas. Under the action of high-temperature and high-pressure gas, the pipeline system will produce different degrees of elastic or plastic deformation due to the influence of thermal stress or expansion stress. When the stress is large, it may also cause the pipeline and pipeline connectors to be damaged, and the sealing and connection functions to fail. To address this problem, a flexible connector is usually introduced into the pipeline system to solve the deformation caused by stress through the axial or radial compensation function of the flexible connector. However, its compensation amount is limited by its structural form. Secondly, the sealing ring selected by the flexible connector is a non-metallic material, and its temperature range in the medium is usually below 200°C. Therefore, when the gas temperature reaches 200°C or above, the pipeline is subjected to greater thermal stress or expansion stress. At the same time, under the working pressure of the gas itself, the stress on the pipeline is further increased, resulting in increased deformation. When used in this harsh environment, the compensation function of the flexible connector will not meet the use requirements, resulting in an increased risk of product failure and reduced connection reliability. Therefore, the use conditions of the flexible connector are limited and it is not suitable for high-temperature and high-pressure environments. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problems of sealing and connection failure caused by the inability of flexible connectors to meet working requirements in the current pipeline system under high temperature and high pressure environment, and to greatly improve the axial and radial compensation of the catheter, so as to meet more complex and harsh operating conditions.

[0004] The technical solution of the present invention is as follows: a combined conduit with a spherical joint is assembled from a conduit and a spherical joint, the spherical joint is provided with two groups, the conduit is provided with three groups, the conduit is welded and connected to the spherical joint at intervals, the spherical joint is composed of a long connecting pipe, an inner ball joint, a sealing ring, a protective cover, an outer ball joint, a bellows, an outer support, and a short connecting pipe, one end of the bellows is welded and connected to the outer side of one end of the long connecting pipe, and the other end is welded and connected to the outer side of one end of the short connecting pipe, the other end of the long connecting pipe and the other end of the short connecting pipe are respectively welded and connected to the conduit, the bellows, the long connecting pipe and the short connecting pipe form a medium passage, and the inner ball joint is in the shape of a trumpet The outer support is a funnel-shaped structure, the narrow diameter end of the outer support is welded to the outer side of the short pipe, the wide diameter end of the outer support is welded to one end of the outer ball joint, the other end of the outer ball joint is bent inward, and the end face is pressed against the outer side of the inner ball joint, the outer ball joint and the inner ball joint are designed with redundancy, the long pipe, the inner ball joint, the outer ball joint, the outer support and the short pipe form a cavity, the bellows is placed in the cavity, the sealing ring is arranged between the inner ball joint and the outer ball joint to ensure that the bellows does not leak gas in the event of failure, one end of the protective cover is welded to the outer side of the narrow diameter end of the inner ball joint, and the other end is welded to the outer side of the narrow diameter end of the inner ball joint. One end is bent inwards, and the end face is pressed against the outer side of the outer ball joint, so that the connection between the outer ball joint and the inner ball joint is located inside the protective cover. The outer ball joint and the outer support tube are fixed by welding to limit the displacement of the outer ball joint in the radial direction of the ball joint from one direction, and absorb the pressure and thrust generated when the bellows is compensated, and work together with the inner ball joint to limit the angular compensation and axial compensation of the bellows, thereby ensuring that the spherical joint will not cause irreversible structural failure due to excessive compensation, and preventing the bellows from reducing fatigue life due to excessive compensation; the bellows relies on its own good deformation ability to resist temperature changes, installation errors, mechanical vibrations, etc. of the system. The inner ball joint and the long pipe are fixed by welding, which limits the displacement of the inner ball joint along the radial direction of the ball joint from another direction, absorbs the pressure and thrust generated by the bellows during compensation, and works together with the outer ball joint to limit the angle compensation and axial compensation of the bellows, thereby ensuring that the spherical joint will not cause irreversible structural failure due to excessive compensation, and can prevent the bellows from reducing fatigue life due to excessive compensation. The protective cover is welded to the inner ball joint to prevent foreign matter from entering the sealing ring part, playing a protective and protective role. The above parts cooperate with each other to realize the axial and angular deformation compensation ability of the product. The spherical joint plays a very important role in the normal operation of high-temperature pipelines. It can rotate 360° around its own axis, and the sphere can also bend in any direction. Using this feature of the spherical joint, its angular displacement can be converted into the displacement of the pipeline straight line to absorb the thermal expansion of the pipeline, resulting in relative deflection of the conduit within a certain range, so that the two straight pipes can be not in a straight line to achieve the purpose of compensation.

[0005] Furthermore, the outer side surface of the long connecting pipe is provided with a protrusion 1, the outer side surface of the short connecting pipe is provided with a protrusion 2, and the corrugated tube is placed between the protrusion 1 and the protrusion 2 (281).

[0006] Furthermore, the conduit is made of stainless steel 321 material, which can fully meet the requirements for use in high temperature environments.

[0007] Furthermore, the shape of the conduit and the size of the spherical joint can be adjusted according to different installation scenarios.

[0008] Furthermore, the bellows is made of thin-walled stainless steel pipe, which is the core functional component of the ball joint. It is composed of multiple layers of thin-walled pipes and has a good flexible sealing effect. It is mainly used to absorb the pressure load in the pipeline.

[0009] Furthermore, the parameters of the bellows, such as the corrugation shape, the number of corrugations, the wave pitch, and the wave height, can be set according to requirements, thereby determining the compensation capacity of the spherical joint.

[0010] Furthermore, the conduit port can be connected to the functional component by welding or spinning, and the functional component can be a flange seat, a nut, a pipe sleeve, a clamp joint, etc.

[0011] In order to meet the use requirements of pipelines in high temperature and high pressure environments, the pipeline system should have metal hard pipes that can adapt to high temperature environments and different installation scenarios to prevent gas leakage. The use of a combined conduit composed of a spherical compensator and a metal hard pipe can not only ensure the sealing and connection reliability of the pipeline system, but also eliminate the deformation caused by the force of the hard pipe. Since the thermal deformation that may occur after the pipeline is heated is large, two spherical compensators are set in the combined conduit, and the compensation amount is doubled, which can meet more complex and harsh working conditions. Therefore, a combined conduit with a spherical joint is introduced into the aircraft pipeline system. In the high temperature and high pressure working environment, it can meet the connection requirements of the conduit and the sealing and compensation requirements of the pipeline. The combined conduit can work in a high temperature environment of 260°C.

[0012] Beneficial effects of the present invention:

[0013] (1) It is suitable for aircraft high-pressure pneumatic pipeline systems that require high reliability, minimum pressure drop, high temperature and high pressure, and high dynamic damping characteristics. It can compensate for the axial or radial offset of the pipeline system caused by heat and pressure disturbance, so that the two straight pipes can be not in a straight line, which can greatly improve the connection strength and sealing performance of the pipeline.

[0014] (2) The connection functional components can be connected to the conduit interface end by selecting flange seats, nuts, pipe sleeves, clamp joints, etc. according to the actual installation conditions. The connection method can be welding or spinning. The installation method is simple and applicable to a wide range of scenarios.

[0015] (3) The shape of the catheter and the size of the ball joint can be adjusted according to different installation scenarios, and its applicability is high.

[0016] (4) A redundancy design is carried out. When the bellows seal fails, the sealing ring arranged on the outer layer can still ensure that the medium does not leak, which can improve the safety and reliability of the ball joint.

[0017] (5) The spherical joint adopts a spherical structure with a smooth surface and ergonomics. The spherical structure bears force evenly, reduces stress concentration, can better protect the bellows, and extend the service life of the bellows. It is installed on the conduit by welding and has good working stability.

[0018] (6) Compared with rigid connection methods such as bolts, the combined conduit is simpler and more convenient, and can avoid the situation where excessive local stress causes damage to the pipeline when using rigid connection.

[0019] (7) It can meet more complex and harsh operating conditions. Under high temperature and high pressure working environment, it can meet the connection requirements of the conduit and the sealing and compensation requirements of the pipeline. The combined conduit can work in a high temperature environment of 260°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 A schematic diagram of the structure of a combined catheter with a spherical joint provided by the present invention;

[0022] Figure 2 A schematic diagram of the spherical joint structure provided by the present invention;

[0023] In the attached figure: 1-catheter

[0024] 2-ball joint, 21-long pipe, 22-inner ball joint, 23-seal ring, 24-protective cover, 25-outer ball joint, 26-bellows, 27-outer support, 28-short pipe, 29-cavity DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0026] See also Figure 1 The figure shows a schematic diagram of the combined catheter structure with a spherical joint provided by the present invention, which is assembled from a catheter 1 and a spherical joint 2. The spherical joint 2 is provided with two groups, and the catheter 1 is made of stainless steel 321 material and is provided with three groups. The catheter 1 and the spherical joint 2 are welded and connected at intervals.

[0027] Figure 2Schematic diagram of the ball joint structure provided by the present invention, the ball joint 2 is composed of a long pipe 21, an inner ball joint 22, a sealing ring 23, a protective cover 24, an outer ball joint 25, a bellows 26, an outer support 27, and a short pipe 28. The bellows 26 is made of thin-walled stainless steel pipe. One end of the bellows 26 is welded to the outside of one end of the long pipe 21, and the other end is welded to the outside of one end of the short pipe 28. The other end of the long pipe 21 and the other end of the short pipe 28 are respectively welded to the conduit 1. The bellows 26, the long pipe 21 and the short pipe 28 form a medium passage. The inner ball joint 22 is a trumpet-shaped structure, and its narrow diameter end is welded to the outer side of the long pipe 21. The outer support 27 is a funnel-shaped structure. The narrow diameter end of the outer support 27 is connected to the outer side of the long pipe 21. The outer end of the short pipe 28 is welded to the outer side surface of the short pipe 28, the wide diameter end of the outer support 27 is welded to one end of the outer ball joint 25, the other end of the outer ball joint 25 is bent inward, and the end face presses the outer side surface of the inner ball joint 22, the outer ball joint 25 and the inner ball joint 22 are designed with redundancy, the long pipe 21, the inner ball joint 22, the outer ball joint 25, the outer support 27 and the short pipe 28 form a cavity 29, the bellows 26 is placed in the cavity 29, the sealing ring 23 is arranged between the inner ball joint 22 and the outer ball joint 25, one end of the protective cover 24 is welded to the outer side surface of the narrow diameter end of the inner ball joint 22, and the other end is bent inward, and the end face presses the outer side surface of the outer ball joint 25, so that the connection between the outer ball joint 25 and the inner ball joint 22 is located on the inner side of the protective cover 24. The outer side surface of the long connecting pipe 21 is provided with a protrusion 211, the outer side surface of the short connecting pipe 28 is provided with a protrusion 281, and the bellows 26 is placed between the protrusion 211 and the protrusion 281. The two ends of the bellows 26 are respectively connected to the long and short connecting pipes to compensate for the axial or radial offset caused by heat and pressure disturbance of the pipeline system, so that the two connected straight pipes can be not in a straight line, which can greatly improve the connection strength and sealing performance of the pipeline. The protective cover 24 is connected to the long connecting pipe 21, and the external support 27 is connected to the short connecting pipe 28. The overall shape is a spherical structure, which is evenly stressed, reduces stress concentration, can better protect the bellows 26, and prolongs the service life of the bellows 26. It is installed on the conduit by welding, and has good working stability. A sealing ring 23 is installed between the inner ball joint 22 and the outer ball joint 25 to provide a redundant design for the spherical joint. When the bellows 26 fails and the medium in the tube leaks, the sealing ring 23 arranged on the outer layer can still ensure that the medium will not leak into the atmosphere, thereby improving the safety and reliability of the spherical joint 2.

[0028] The shape of the conduit 1 and the size of the ball joint 2 can be adjusted according to different installation scenarios. The corrugation shape, number of corrugations, wave pitch, wave height and other parameters of the bellows 26 can be set according to requirements. The port of the conduit 1 can be connected to the functional component by welding or spinning, and the functional component can be selected from a flange seat, a nut, a pipe sleeve, a clamp joint, etc.

[0029] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification or equivalent substitution made to the technical solution of the present invention by ordinary technicians in this field shall be included in the scope of the claims of the present invention as long as it does not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A combined catheter with a spherical joint, characterized in that: The invention is assembled from a conduit (1) and a spherical joint (2), wherein the spherical joint (2) is provided with two groups, and the conduit (1) is provided with three groups. The conduit (1) is welded to the spherical joint (2) at intervals. The spherical joint (2) is composed of a long connecting pipe (21), an inner spherical joint (22), a sealing ring (23), a protective cover (24), an outer spherical joint (25), a bellows (26), an outer support (27), and a short connecting pipe (28). One end of the bellows (26) is welded to the outer side of one end of the long connecting pipe (21), and the other end is welded to the outer side of one end of the short connecting pipe (28). The other end of the long connecting pipe (21) and the other end of the short connecting pipe (28) are respectively welded to the conduit (1). The bellows (26), the long connecting pipe (21), and the short connecting pipe (28) form a medium passage. The inner spherical joint (22) is a trumpet-shaped structure, and its narrow diameter end is welded to the outer side of the long connecting pipe (21). The outer support (27) ) is a funnel-shaped structure, the narrow diameter end of the outer support (27) is welded to the outer side surface of the short pipe (28), the wide diameter end of the outer support (27) is welded to one end of the outer ball joint (25), the other end of the outer ball joint (25) is bent inward, and the end surface is pressed against the outer side surface of the inner ball joint (22), the outer ball joint (25) and the inner ball joint (22) are designed with redundancy, and the long pipe (21), the inner ball joint (22), the outer ball joint (25), the outer support (27) and the short pipe (28) are welded to each other. The connecting pipe (28) forms a cavity (29), the bellows (26) is placed in the cavity (29), the sealing ring (23) is arranged between the inner ball joint (22) and the outer ball joint (25), one end of the protective cover (24) is welded to the outer side surface of the narrow diameter end of the inner ball joint (22), and the other end is bent inwardly, and the end surface is pressed against the outer side surface of the outer ball joint (25), so that the connection between the outer ball joint (25) and the inner ball joint (22) is located inside the protective cover (24).

2. The combined catheter with a ball joint according to claim 1, characterized in that: The outer side surface of the long connecting pipe (21) is provided with a first protrusion (211), the outer side surface of the short connecting pipe (28) is provided with a second protrusion (281), and the corrugated tube (26) is arranged between the first protrusion (211) and the second protrusion (281).

3. The combined catheter with a ball joint according to claim 1, characterized in that: The conduit (1) is made of stainless steel 321.

4. The combined catheter with a ball joint according to claim 1, characterized in that: The shape of the conduit (1) and the size of the spherical joint (2) can be adjusted according to different installation scenarios.

5. The combined catheter with a ball joint according to claim 1, characterized in that: The bellows (26) is made of thin-walled stainless steel pipe.

6. The combined catheter with a ball joint according to claim 1, characterized in that: Parameters of the bellows (26), such as the shape of the bellows, the number of the bellows, the wave distance, the wave height, etc., can be set according to requirements.

7. The combined catheter with a ball joint according to claim 1, characterized in that: The port of the conduit (1) can be connected to the functional component by welding or spinning, and the functional component can be selected from a flange seat, a nut, a pipe sleeve, a clamp joint, etc.

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