Pipeline connection device and air pipeline

Abstract

The present invention provides a pipeline connection device and an air pipeline, which can compensate for the axial displacement and angular error between two connected pipelines, and are easy to process, assemble, disassemble and maintain. The air pipeline is used for a turbine engine and includes a pipeline connection device. The pipeline connection device includes a first connector for connecting a first pipeline, a second connector for connecting a second pipeline, a third connector, a plurality of balls circumferentially distributed, a first limiting structure arranged on the first connector and a second limiting structure arranged on the second connector. A spring is arranged between the third connector and the first connector, and the elastic force of the spring presses the third connector against the second connector. The second connector and the third connector are matched through a spherical pair, and the second connector and the third connector can axially move relative to the first connector. The first limiting structure and the second limiting structure are connected by balls, and the second limiting structure moves and rotates relative to the first limiting structure through the balls.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline connection design, and particularly relates to a pipeline connection device and an air pipeline. Background Art

[0002] The pipeline system of an aero-engine mainly includes a fuel pipeline, a lubricating oil pipeline, and an air pipeline. As an important part of the engine, the air pipeline mainly conveys cooling bleed air, anti-icing bleed air, sealing bleed air, and functional bleed air to various components of the aero-engine, so as to ensure the normal operation of various components of the aero-engine.

[0003] The air pipeline is usually installed on the bleed air interfaces between different components of the engine. During the engine assembly process, it is often difficult to install the subsequently assembled air pipeline due to the accumulation of assembly errors of other components. Compared with other fuel pipelines and lubricating oil pipelines, the diameter of the air pipeline is usually relatively thick. For example, the diameter is 1.5 in to 4 in. If there is no adjustable device on the pipeline, when it is difficult to assemble due to accumulated errors during assembly, usually only manual pipe shaping can be relied on, which has low efficiency and will cause relatively large assembly stress. For air pipelines with a diameter exceeding a certain value, it is basically impossible to calibrate the pipes, and only additional processing or reprocessing can be carried out, resulting in an extended assembly cycle and increased assembly costs.

[0004] In current designs, in order to enable the air pipeline to have a certain compensation and adjustment ability during assembly, universal joints are usually welded to the pipeline so that the pipeline can have a certain angular compensation ability. However, the universal joint can usually only compensate for angular deviation and cannot compensate for axial displacement. Moreover, the universal joint itself requires internal welding of a metal bellows during manufacturing, and the processing is relatively complex. Once it is welded to the pipeline, it cannot be disassembled and maintained anymore. Summary of the Invention

[0005] An object of the present invention is to provide a pipeline connection device that can compensate for the axial displacement and angular error between two connected pipelines, and is easy to process, assemble, disassemble, and maintain.

[0006] A pipeline connection device for achieving the above object includes a first connector, a second connector, a third connector, a plurality of balls circumferentially distributed, a first limiting structure and a second limiting structure. The first connector is used to connect the first section of pipeline, the second connector is used to connect the second section of pipeline, a spring is arranged between the third connector and the first connector, and the elastic force of the spring presses the third connector against the second connector. The second connector and the third connector are matched through a spherical pair, and the second connector and the third connector can axially move relative to the first connector. The first limiting structure is arranged on the first connector, the second limiting structure is arranged on the second connector, the first limiting structure and the second limiting structure are connected through the balls, and the second limiting structure moves and rotates relative to the first limiting structure through the balls.

[0007] In one or more embodiments of the pipeline connection device, one of the first limiting structure and the second limiting structure provides an inner limiting portion, and the other of the first limiting structure and the second limiting structure provides an outer limiting portion. The outer limiting portion is located radially outside the inner limiting portion, and the outer limiting portion and the inner limiting portion are connected through the balls.

[0008] In one or more embodiments of the pipeline connection device, one of the first limiting structure and the second limiting structure further provides a radial limiting portion, and the radial limiting portion limits the range of movement of the balls radially outward.

[0009] In one or more embodiments of the pipeline connection device, the outer limiting portion is provided with a plurality of ball holes or ball grooves circumferentially distributed. The length direction of the ball grooves is along the axis of the outer limiting portion or at an angle less than 90 degrees with the axis. The balls are inserted into the ball holes or the ball grooves one by one. The ball holes or the ball grooves penetrate through the outer limiting portion, and the diameter of the ball holes or the width of the ball grooves is not less than the diameter of the balls.

[0010] In one or more embodiments of the pipeline connection device, an annular groove is provided on the outer peripheral surface of the inner limiting portion or the inner peripheral surface of the outer limiting portion, and the balls can roll axially and / or circumferentially in the annular groove.

[0011] In one or more embodiments of the pipeline connection device, two annular shoulders are arranged at intervals along the axis on the outer peripheral surface of the inner limiting portion or the inner peripheral surface of the outer limiting portion, and the balls can roll axially and / or circumferentially between the two annular shoulders.

[0012] In one or more embodiments of the described pipeline connection device, the second connecting member and the third connecting member are located radially inside the first connecting member, and the outer ring surface of the first connecting member provides the inner limiting portion.

[0013] In one or more embodiments of the described pipeline connection device, the pipeline connection device further includes a sealing ring, which is in contact with the first connecting member, the second connecting member, and the third connecting member and can axially move along with the second connecting member and the third connecting member.

[0014] In one or more embodiments of the described pipeline connection device, the material of the sealing ring is graphite or a composite material including graphite.

[0015] In one or more embodiments of the described pipeline connection device, the number of the plurality of balls is at least three and they are evenly distributed circumferentially.

[0016] In one or more embodiments of the described pipeline connection device, the pipeline connection device further includes a connecting pipe, and the first connecting member or / and the second connecting member connect the first pipeline section or / and the second pipeline section through the connecting pipe.

[0017] The pipeline connection device uses the elastic force of a spring to keep the inner spherical surface and the outer spherical surface between the second connecting member and the third connecting member in close contact, thereby playing a sealing role. And through the spherical pair composed of the inner spherical surface and the outer spherical surface, angular deflection and circumferential rotation can occur between the second connecting member and the third connecting member, and the second connecting member and the third connecting member can axially move relative to the first connecting member, so as to compensate for the axial displacement and angular error between the two connected pipeline sections; by setting the first limiting structure, the second limiting structure and a plurality of circumferentially distributed balls, the friction force can be reduced, making the axial displacement, angular deflection and circumferential torsion between the first pipeline section and the second pipeline section smoother, and restricting the axial movement range of the second connecting member relative to the first connecting member to prevent the second connecting member from disengaging from the first connecting member and the third connecting member. The structure of this pipeline connection device is simple, facilitating processing, manufacturing and assembly, which can reduce the probability of performing assembly alignment, supplementary processing or reprocessing on the pipeline, greatly improve the assembly efficiency of the pipeline, shorten the assembly cycle, reduce the assembly cost, and can effectively reduce the assembly stress, and is easy to disassemble, so that the damaged parts of the pipeline connection device can be replaced or repaired to improve the service life of the pipeline. This pipeline connection device is not only applicable to the pipeline system of an aeroengine, but also can be used in the pipeline systems of other fields.

[0018] Another object of the present invention is to provide an air pipeline that can compensate for the axial displacement and angular error between two connected pipeline sections and is easy to process, assemble, disassemble and maintain.

[0019] An air pipeline for achieving the above object and used in a turbine engine includes the aforementioned pipeline connection device.

[0020] This air pipeline has good compensation and adjustment capabilities, can compensate for the axial displacement and angular error between pipelines, can reduce the probability of pipeline assembly alignment, supplementary machining or re-machining, greatly improve the assembly efficiency of the air pipeline, shorten the assembly cycle, reduce the assembly cost, and can effectively reduce the assembly stress, and is easy to disassemble and maintain, thereby improving the service life of the air pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, properties, and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments, where:

[0022] Figure 1 is an axonometric sectional schematic view of a pipeline connection device according to an embodiment.

[0023] Figure 2 is according to Figure 1 sectional schematic view of the pipeline connection device.

[0024] Figure 3 is according to Figure 2 sectional schematic view of the pipeline connection device when compensating for axial displacement.

[0025] Figure 4 is according to Figure 2 sectional schematic view of the pipeline connection device when compensating for angular error.

[0026] Figure 5 is along Figure 2 schematic view in the B direction in

[0027] Figure 6 is along Figure 2 sectional schematic view along the A-A cutting line in

[0028] Figure 7 is Figure 2 partial enlarged schematic view at C in

[0029] Figure 8 is a sectional schematic view of a pipeline connection device according to another embodiment.

[0030] Figure 9 is a sectional schematic view of a pipeline connection device according to still another embodiment.

[0031] Figure 10 is a sectional schematic view of a pipeline connection device according to another embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following discloses various different embodiments or examples for implementing the described subject technical solution. To simplify the disclosure content, specific examples of each component and arrangement are described below. Of course, these are merely examples and do not limit the protection scope of the present invention. It should be noted that the drawings are only examples and are not drawn under the condition of equal proportion, and should not limit the actual protection scope required by the present invention.

[0033] The pipeline connection device 100 according to an embodiment of the present invention is as Figures 1 to 4 shown, and includes a first connector 1, a second connector 2, a third connector 3, a plurality of balls 9 distributed circumferentially, a first limiting structure 11 and a second limiting structure 12.

[0034] The first connector 1 and the second connector 2 are respectively used to connect the first section of pipeline and the second section of pipeline. For example, they are connected by pipeline connection methods such as welding, or ferrule connection, or pipe thread connection, or taper thread connection, etc., and a sealing ring or other sealing method is adopted according to the needs of the connection method. Or the pipeline connection device 100 further includes a nipple 4, and the first connector 1 or / and the second connector 2 are connected to the first section of pipeline or / and the second section of pipeline through the nipple 4. The nipple 4 and the first connector 1 or / and the second connector 2 can be connected by pipeline connection methods such as welding, or ferrule connection, or pipe thread connection, or taper thread connection, etc., and a sealing ring or other sealing method is adopted according to the needs of the connection method.

[0035] A spring 5 is arranged between the third connector 3 and the first connector 1. For example, a helical spring, or a disc spring, or a corrugated spring, etc. can be adopted. The elastic force of the spring 5 presses the third connector 3 against the second connector 2. The second connector 2 and the third connector 3 can axially move relative to the first connector 1, as Figure 2 and Figure 3 shown, so as to compensate for the axial displacement between the first section of pipeline and the second section of pipeline connected by the pipeline connection device 100.

[0036] Continuing to refer to Figures 1 to 4 , the second connector 2 and the third connector 3 are matched through a spherical pair 6. For example, the second connector 2 has an outer spherical surface 8, and the third connector 3 has an inner spherical surface 7. The elastic force of the spring 5 keeps the inner spherical surface 7 and the outer spherical surface 8 in close contact, so as to play a sealing role through the matched inner spherical surface 7 and outer spherical surface 8, and the second connector 2 and the third connector 3 can have angular deflection and circumferential rotation through the spherical pair 6, as Figure 2 and Figure 4As shown, angular deflection and circumferential torsion between the first pipeline and the second pipeline connected by the pipeline connection device 100 can thus be compensated. In another embodiment, the second connecting member 2 has an inner spherical surface and the third connecting member 3 has an outer spherical surface, and the same technical effect can be achieved.

[0037] Continuing to refer to Figures 1 to 4 , the first limiting structure 11 is arranged on the first connecting member 1, and the second limiting structure 12 is arranged on the second connecting member 2. The first limiting structure 11 provides an inner limiting portion 13 and a radial limiting portion 17. An annular groove 15 surrounding the outer peripheral surface 131 is arranged on the outer peripheral surface 131 of the inner limiting portion 13. The axial width of the annular groove 15 is greater than the diameter of the ball 9. The ball 9 can roll axially and / or circumferentially in the annular groove 15, and the range of the ball 9 moving radially inwards can be limited by the bottom of the annular groove 15 to prevent the ball 9 from coming out from the radial inside. The second limiting structure 12 provides an outer limiting portion 14. The outer limiting portion 14 is located radially outside the inner limiting portion 13. The outer limiting portion 14 is provided with a plurality of ball holes 16 distributed circumferentially. The balls 9 are inserted into the ball holes 16 one by one. The ball holes 16 penetrate through the outer limiting portion 14. The ball holes 16 can be set as round holes, the diameter of the round holes is not less than the diameter of the ball 9, or the ball holes 16 can also be set as holes of other shapes, such as oval holes, polygonal holes, special-shaped holes, etc. The cross-sectional dimension of the ball holes 16 can enable the balls 9 to pass through.

[0038] During assembly, the outer limiting portion 14 is installed radially outside the inner limiting portion 13, and then the balls 9 are loaded into the ball holes 16 and the annular groove 15 one by one from the radial outside, so that the inner limiting portion 13 and the outer limiting portion 14 are movably connected through the balls 9. Then the radial limiting portion 17 is installed radially outside the outer limiting portion 14, and the range of the balls 9 moving radially outwards is limited by the radial limiting portion 17 to prevent the balls 9 from coming out from the radial outside.

[0039] Referring to Figures 1 to 5 , an external thread 102, a stop shoulder 103 and a clamping groove 104 are arranged on the outer ring surface 101 of the first connecting member 1. The radial limiting portion 17 is connected to the external thread 102 through an internal thread 171, and is locked and positioned through the stop shoulder 103 and a snap ring 18 arranged in the clamping groove 104.

[0040] Thus, the second limiting structure 12 is connected to the first limiting structure 11 through the balls 9, and can move and rotate relative to the first limiting structure 11 through the balls 9, which can reduce friction, make the axial displacement, angular deflection and circumferential torsion between the first pipeline and the second pipeline smoother, and can limit the axial movement range of the second connecting member 2 relative to the first connecting member 1 to prevent the second connecting member 2 from disconnecting from the first connecting member 1 and the third connecting member 3.

[0041] In the description of the present invention, it should be understood that unless otherwise clearly specified and defined, when the first element is described as being connected to or disposed on the second element, this description includes the embodiment where the first element is directly connected to the second element, and also includes the embodiment where one or more other intervening elements are added to indirectly connect the first and second elements, and further includes the embodiment where the first element and the second element are of an integral structure. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances. It should be noted that the use of terms such as "first" and "second" to limit the components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus cannot be understood as limiting the protection scope of the present invention. In addition, the terms "radially inner side" and "radially outer side" refer to being located inside or outside radially with respect to the first connecting member 1 or the second connecting member 2.

[0042] In the foregoing embodiment, the first limiting structure 11 provides an inner limiting portion 13, and the second limiting structure 12 provides an outer limiting portion 14. In some other embodiments, it is also possible that the first limiting structure 11 provides the inner limiting portion 13, and the second limiting structure 12 provides the outer limiting portion 14, and the outer limiting portion 14 is located radially outside the inner limiting portion 13. Thus, it is possible to facilitate restricting the axial and radial movement ranges of the ball 9, holding the ball 9 between the first limiting structure 11 and the second limiting structure 12, and further restricting the axial movement range of the second connecting member 2 relative to the first connecting member 1.

[0043] In Figures 1 to 4 In the shown embodiment, the first limiting structure 11 provides a radial limiting portion 17. In some other embodiments, it is also possible that the second limiting structure 12 provides the radial limiting portion 17. The radial limiting portion 17 can be connected to the inner limiting portion 13, or the outer limiting portion 14, or the first connecting member 1, or the second connecting member 2 by means of threaded connection, snap connection or other means, and the radial limiting portion 17 can be locked and positioned by means of a snap ring, a positioning pin or other structures. In still some other embodiments, it is also possible to restrict the radial outer movement range of the ball 9 through the outer limiting portion 14, so that the radial limiting portion 17 can be not provided, as will be described later in detail.

[0044] Referring to Figure 8, in yet another embodiment, the first limiting structure 11 provides an inner limiting portion 13, and the second limiting structure 12 provides an outer limiting portion 14 and a radial limiting portion 17. The outer limiting portion 14 is located radially outside the inner limiting portion 13. An annular groove 15 surrounding the outer peripheral surface 131 is provided on the outer peripheral surface 131 of the inner limiting portion 13. The axial width of the annular groove 15 may be greater than the diameter of the ball 9, or may be less than or equal to the diameter of the ball 9. The ball 9 can roll circumferentially within the annular groove 15. The outer limiting portion 14 is provided with a plurality of ball grooves 20 distributed circumferentially. The length direction of the ball groove 20 is along the axial direction of the outer limiting portion 14 or at an angle less than 90 degrees with this axial direction. The balls 9 are inserted into the plurality of ball grooves 20 one by one and can roll along the length direction of the ball groove 20. The ball groove 20 penetrates the outer limiting portion 14, and the width of the ball groove 20 is not less than the diameter of the ball 9. During assembly, the outer limiting portion 14 is installed radially outside the inner limiting portion 13, and then the balls 9 are loaded into the ball grooves 20 and the annular groove 15 of the inner limiting portion 13 one by one from the radial outside, so that the inner limiting portion 13 and the outer limiting portion 14 are movably connected by the balls 9. Then, the radial limiting portion 17 is installed radially outside the outer limiting portion 14 through bolts 21.

[0045] Thus, the friction can be reduced by the rolling of the balls 9, making the axial displacement, angular deflection, and circumferential torsion between the first pipeline and the second pipeline smoother, and restricting the axial movement range of the second connector 2 relative to the first connector 1 to prevent the second connector 2 from disconnecting from the first connector 1 and the third connector 3. The movement ranges of the balls 9 in the radial inner and outer directions can also be restricted by the bottom of the annular groove 15 and the radial limiting portion 17 to prevent the balls 9 from coming out radially.

[0046] Referring to Figure 9 and Figure 10 , in some other embodiments, the inner limiting portion 13 is provided with a plurality of limiting holes 23 distributed circumferentially. The limiting holes 23 are blind holes provided on the outer peripheral surface 131 of the inner limiting portion 13, such as round holes, long holes, polygonal holes, special-shaped holes, etc. The plurality of balls 9 are inserted into the plurality of limiting holes 23 one by one. Two annular shoulders 22 are provided on the inner peripheral surface 141 of the outer limiting portion 14 at intervals along the axial direction. The axial distance between the inner sides of the two annular shoulders 22 is greater than the diameter of the ball 9. The ball 9 can roll axially and / or circumferentially between the two annular shoulders 22, so that the inner limiting portion 13 and the outer limiting portion 14 are movably connected by the ball 9.

[0047] To facilitate the installation of the balls 9, the outer limiting portion 14 can be set as a split structure, for example, set as Figure 9The axially-sectioned structure shown, i.e., the outer limiting portion 14 is composed of a first part 142 and a second part 143, or the outer limiting portion 14 is arranged as a radially-sectioned structure, i.e., composed of two semi-circular structures, or at least one annular shoulder 22 is arranged as a detachable structure.

[0048] Referring to Figure 10 , for the convenience of installing the ball 9, a ball installation channel 24 communicating with the inner sides of the two annular shoulders 22 can also be provided, such as structures like holes or grooves, etc., and after the installation of the ball 9 is completed, the ball installation channel 24 is blocked or closed with a plug 25 or other means.

[0049] Thus, the friction can be reduced by the rolling of the ball 9, making the axial displacement, angular deflection, and circumferential torsion between the first pipeline section and the second pipeline section smoother, and restricting the axial movement range of the second connector 2 relative to the first connector 1 to prevent the disconnection between the second connector 2 and the first connector 1 and the third connector 3. Also, the movement ranges of the ball 9 in the radially inner and outer directions can be restricted by the bottom of the limiting hole 23 and the inner peripheral surface 141 of the outer limiting portion 14 to prevent the ball 9 from radially coming out. The radially limiting portion 17 does not have to be provided, thereby simplifying the structure of the pipeline connection device 100 and reducing the radial dimension for easy processing, manufacturing, and assembly.

[0050] It should be noted that the "one embodiment" or "some embodiments" mentioned twice or more at different positions in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the present application can be appropriately combined. For example, an annular groove can be provided on the inner peripheral surface 141 of the outer limiting portion 14, and the aforementioned limiting hole 23 or other ball limiting structures can be provided on the outer peripheral surface 131 of the inner limiting portion 13, or two annular shoulders can be arranged at intervals along the axial direction on the outer peripheral surface 131 of the inner limiting portion 13, and the aforementioned ball hole 16 or ball groove 20 or other ball limiting structures can be provided on the outer limiting portion 14, and so on.

[0051] In Figures 1 to 4 , Figures 8 to 10 In the embodiment shown, the second connector 2 and the third connector 3 are located radially inside the first connector 1, and the outer ring surface 101 of the first connector 1 provides the inner limiting portion 13, thereby simplifying the structure of the pipeline connection device 100 and reducing the radial dimension for easy processing, manufacturing, and assembly. In some other embodiments, the inner limiting portion 13 can also be arranged radially outside the first connector 1.

[0052] Referring to Figure 6, the number of multiple ball bearings 10 is at least three and they are evenly distributed circumferentially. Thus, the force in the circumferential direction can be made more balanced, making the axial displacement, angular deflection, and circumferential torsion between the first pipe section and the second pipe section smoother.

[0053] Referring to Figure 2 and Figure 7 , the pipe connection device 100 further includes a sealing ring 19 disposed between the first connecting member 1, the second connecting member 2, and the third connecting member 3. The sealing ring 19 can axially move along with the second connecting member 2 and the third connecting member 3. The sealing ring 19 generates a certain amount of radial expansion deformation under the extrusion of the second connecting member 2 and the third connecting member 3, so as to maintain radial fit with the first connecting member 1 to form a secondary seal, which plays a supplementary and strengthening role in the seal between the inner spherical surface 7 and the outer spherical surface 8 mentioned above, further increasing the sealing performance and reliability of the pipe connection device 100, so that the pipe connection device 100 can be applied to a greater pressure.

[0054] The material of the sealing ring 19 can be graphite or a composite material including graphite, so that the sealing ring 19 has lubricity, which is convenient for axially moving along with the second connecting member 2 and the third connecting member 3, reducing the friction force when the inner spherical surface 7 and the outer spherical surface 8 rotate relative to each other, and can withstand a relatively high temperature.

[0055] The materials of the first connecting member 1, the second connecting member 2, the third connecting member 3, the first limiting structure 11, and the second limiting structure 12 can be stainless steel materials, so that the pipe connection device 100 has good high-temperature resistance and corrosion resistance.

[0056] The pipe connection device 100 makes the inner spherical surface 7 and the outer spherical surface 8 between the second connecting member 2 and the third connecting member 3 keep in close contact through the elastic force of the spring 5, thus playing a sealing role. And through the spherical pair 6 composed of the inner spherical surface 7 and the outer spherical surface 8, angular deflection and circumferential rotation can occur between the second connecting member 2 and the third connecting member 3, and the second connecting member 2 and the third connecting member 3 can axially move relative to the first connecting member 1, so as to compensate for the axial displacement and angular error between the two connected pipe sections; by setting the first limiting structure 11, the second limiting structure 12, and a plurality of ball bearings 9 distributed circumferentially, the friction force can be reduced, making the axial displacement, angular deflection, and circumferential torsion between the first pipe section and the second pipe section smoother, and restricting the axial movement range of the second connecting member 2 relative to the first connecting member 1 to prevent the second connecting member 2 from disengaging from the first connecting member 1 and the third connecting member 3.

[0057] The structure of the pipeline connection device 100 is simple, facilitating processing, manufacturing and assembly. It can reduce the probability of assembling, aligning, supplementing or reprocessing the pipeline, greatly improve the assembly efficiency of the pipeline, shorten the assembly cycle, reduce the assembly cost, effectively reduce the assembly stress, and is easy to disassemble. Thus, damaged parts of the pipeline connection device 100 can be replaced or repaired to extend the service life of the pipeline. The pipeline connection device 100 is not only applicable to the pipeline system of an aeroengine, but also can be used in the pipeline systems of other fields.

[0058] An air pipeline according to one or more embodiments of the present invention is used in a turbine engine and includes the aforementioned pipeline connection device 100. The air pipeline has good compensation and adjustment capabilities, can compensate for the axial displacement and angular error between pipelines, can reduce the probability of assembling, aligning, supplementing or reprocessing the pipeline, greatly improve the assembly efficiency of the air pipeline, shorten the assembly cycle, reduce the assembly cost, effectively reduce the assembly stress, and is easy to disassemble and maintain. Thus, the service life of the air pipeline can be extended.

[0059] Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention all fall within the protection scope defined by the claims of the present invention.

Claims

1. Pipeline connection device, comprising a first connecting piece, a second connecting piece and a third connecting piece, wherein the first connecting piece is used for connecting the first section of pipeline, the second connecting piece is used for connecting the second section of pipeline, a spring is arranged between the third connecting piece and the first connecting piece, the elastic force of the spring causes the third connecting piece to press against the second connecting piece, the second connecting piece and the third connecting piece are matched through a spherical pair, and the second connecting piece and the third connecting piece can axially move relative to the first connecting piece, characterized in that, The pipeline connection device further includes a plurality of balls circumferentially distributed, a first limiting structure and a second limiting structure. The first limiting structure is arranged on the first connecting piece, the second limiting structure is arranged on the second connecting piece, the first limiting structure and the second limiting structure are connected by the balls, and the second limiting structure moves and rotates relative to the first limiting structure through the balls; One of the first limiting structure and the second limiting structure provides an inner limiting portion, and the other of the first limiting structure and the second limiting structure provides an outer limiting portion. The outer limiting portion is located radially outside the inner limiting portion, and the outer limiting portion and the inner limiting portion are connected by the balls; One of the first limiting structure and the second limiting structure further provides a radial limiting portion, and the radial limiting portion limits the range of movement of the balls radially outward; The outer limiting portion is provided with a plurality of ball holes or ball grooves circumferentially distributed. The ball holes or the ball grooves penetrate through the outer limiting portion, and the balls are inserted into the ball holes or the ball grooves one by one; The outer peripheral surface of the inner limiting portion is provided with an annular groove, and the balls can roll axially and / or circumferentially in the annular groove. The inner limiting portion has an axial stop; 2. The pipeline connection device according to claim 1, characterized in that, The length direction of the ball groove is along the axis of the outer limiting portion or at an angle less than 90 degrees with the axis. The diameter of the ball hole or the width of the ball groove is not less than the diameter of the ball; 3. The pipeline connection device according to claim 1, wherein The inner peripheral surface of the outer limiting portion is axially provided with two annular shoulders at intervals, and the balls can roll axially and / or circumferentially between the two annular shoulders; 4. The pipeline connection device according to any one of claims 1-3, characterized in that, The second connecting piece and the third connecting piece are located radially inside the first connecting piece, and the outer ring surface of the first connecting piece provides the inner limiting portion; 5. The pipeline connection device according to any one of claims 1-3, characterized in that, The pipeline connection device further includes a sealing ring. The sealing ring is in contact with the first connecting piece, the second connecting piece and the third connecting piece, and can axially move along with the second connecting piece and the third connecting piece; 6. The pipeline connection device according to claim 5, wherein, The material of the sealing ring is graphite or a composite material including graphite; 7. The pipeline connection device according to any one of claims 1 to 3, characterized in that The number of the plurality of balls is at least three and is evenly distributed circumferentially; 8. The pipeline connection device according to any one of claims 1 to 3, characterized in that The pipeline connection device further includes a connecting pipe. The first connecting piece or / and the second connecting piece connect the first section of pipeline or / and the second section of pipeline through the connecting pipe; 9. An air pipeline for a turbomachine, characterized in that, Including the pipeline connection device according to any one of claims 1 to 8.

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