Pipeline connecting joint and low-pressure pipeline of aviation environment control system

Abstract

The invention provides a pipeline connecting joint and a low-pressure pipeline of an aviation environmental control system, relates to the field of aviation pipelines, and solves the problems of complex structure, various parts and low assembly efficiency during low-pressure pipeline connection. The pipeline connecting joint comprises a son joint, a mother joint and a sleeve, the son joint is used for being fixed to the connecting end of one pipeline, and the mother joint is used for being fixed to the connecting end of the other pipeline; the sleeve is arranged outside the sub-joint in a sleeving manner and is rotatably arranged on the sub-joint; the female connector is provided with an inserting groove, the end of the male connector is in butt joint with the inserting groove, and when the sleeve is arranged outside the female connector in a covering mode, the sleeve can rotate outside the male connector under the action of external force and is fixedly connected with the female connector, so that the male connector is screwed into the inserting groove, and then the two pipelines are fixedly connected in a sealed mode. The sleeve is rotatably arranged on the sub-connector, so that connection can be completed only by rotating the sleeve in the pipeline connection process, additional spare and accessory parts are not needed, operation is easy and convenient, and installation flexibility and reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of aviation piping technology, and in particular to a pipe connection joint and a low-pressure pipeline for an aviation environmental control system. Background Technology

[0002] As one of the key systems of modern aircraft, the aircraft environmental control system is responsible for regulating the temperature, pressure, humidity and air quality in the cabin, and has a decisive impact on flight safety and passenger comfort.

[0003] Currently, low-pressure pipeline connections in the aviation industry primarily utilize rolled corrugated fittings. (See also...) Figures 1-3 As shown, pipe 100 and pipe 200 are connected in the following way: the connector corrugated sleeve 300 mates with the straight sleeve 400 or the compensating sleeve 500, and is fixed with two metal clamps 600, thereby achieving the connection between the pipes. Specifically, this connection method requires completing the following steps in sequence: First, slip the straight sleeve 400 or the compensating sleeve 500 onto the end of the pipe; then insert the connector corrugated sleeve 300 into the pipe; next, adjust the position of the straight sleeve or the compensating sleeve 500 so that it covers the connection area between the connector and the pipe; finally, use two metal clamps 600 to fix the two ends of the straight sleeve 400 or the compensating sleeve 500 respectively.

[0004] The applicant has discovered that the prior art has at least the following technical problems: The connection structure between aviation low-pressure pipelines in the prior art is complex and has many parts. The connection process requires the use of various parts and standard parts such as joint rolling, silicone sleeves (straight-through or compensating type) and two metal narrow band clamps. Completing a pipeline connection requires step-by-step operation, including sleeve installation, joint insertion, position adjustment and clamp fixing, etc., resulting in low assembly efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a pipe connection joint and a low-pressure pipe for an aviation environmental control system, to solve the technical problems of complex structure, numerous components, and low assembly efficiency in the connection of low-pressure pipes in the prior art. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The pipe connection joint provided by the present invention includes a male connector, a female connector, and a sleeve, wherein: The sub-connector is used to fix the connection end of one of the pipes, and the female connector is used to fix the connection end of the other pipe. The sleeve is fitted over the sub-joint and is rotatably mounted on the sub-joint; The female connector is provided with a slot, and the end of the female connector is mated with the slot. When the sleeve is placed outside the female connector, the sleeve can rotate outside the female connector under the action of external force and be fixedly connected with the female connector, thereby screwing the female connector into the slot and sealingly connecting the two pipes.

[0007] Preferably, the inner wall of the sleeve has an internal thread, and the outer wall of the female connector has an external thread. The external thread is located outside the slot, and the internal thread can engage with the external thread to lock when the sleeve is rotated, thereby connecting the female connector to the sleeve in a threaded connection.

[0008] Preferably, the sub-connector has a first reduced diameter section, the outer diameter of which is smaller than the outer diameter of the rest of the sub-connector, and the first reduced diameter section is inserted into and fixed in the connection end corresponding to the pipeline. The female connector has a second reduced diameter section, the outer diameter of which is smaller than the outer diameter of the external threaded portion. The second reduced diameter section is inserted into and fixed within the connection end corresponding to the pipeline.

[0009] Preferably, the slot is an annular groove, and the slot is arranged around the axis of the female connector; The end of the slot opposite to the pipe it is fixed to is the first open end, which is used for the insertion of the sub-connector.

[0010] Preferably, the female connector has a first annular wall and a second annular wall, the slot is formed between the first annular wall and the second annular wall, the external thread is located on the outer surface of the first annular wall, the sleeve is threadedly connected to the first annular wall, and a limiting groove is provided on the inner wall of the female connector, and the second annular wall is inserted into the limiting groove.

[0011] Preferably, a sealing ring is fixed inside the slot, the sealing ring is fixed to the end of the slot, and the sealing ring is used to abut against the end of the sub-connector.

[0012] Preferably, a limiting rib is provided on the outer wall of the sub-connector, the outer diameter of the limiting rib is larger than the outer diameter of the other positions of the sub-connector, and the outer diameter of the sub-connector is smaller than the outer diameter of the pipeline it is fixed to; One end of the sleeve is a second open end, and the outer wall of the slot can extend into the sleeve from the second open end; The other end of the sleeve is the mounting end, which has a shaft hole. The sub-connector passes through the shaft hole, and the outer diameter of the limiting rib is larger than the inner diameter of the shaft hole, thereby limiting the mounting end of the sleeve between the limiting rib and the corresponding pipeline.

[0013] Preferably, the limiting rib is an annular rib arranged around the axis of the sub-joint.

[0014] Preferably, the limiting rib has an outer conical surface, and the outer diameter of the outer conical surface gradually decreases in the direction away from the shaft hole.

[0015] The present invention provides a low-pressure pipeline for an aviation environmental control system, comprising pipelines and pipeline connection joints, wherein the pipelines are sealed and fixed together by the pipeline connection joints.

[0016] The pipe connection joint and low-pressure pipeline of the aviation environmental control system provided by this invention have the following advantages compared with the prior art: the sub-joint is used to fix the connection end of one pipe, and the female joint is used to fix the connection end of another pipe. When connecting the pipes, the end of the sub-joint mates with the slot, and the sleeve is located outside the female joint. By rotating the sleeve, which is rotatable on the sub-joint, the sleeve can be gradually fixed with the female joint, and the sub-joint is screwed into the slot. The two pipes are sealed and fixedly connected without the need for additional parts, simplifying the connection structure. The rotatable setting of the sleeve on the sub-joint means that the connection process can be completed simply by rotating the sleeve, which is easy to operate and improves the installation flexibility and reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the connection between two pipelines in the prior art; Figure 2 This is a connection diagram of one method of pipeline connection in the existing technology; Figure 3 This is a schematic diagram of another method of pipe connection in the existing technology; Figure 4 This is a structural diagram of the pipe connection joint that fixes pipe one and pipe two. Figure 5 This is a schematic diagram of the pipe connection joints before they are connected; Figure 6 This is a schematic axial cross-sectional view of the pipe connection joint that fixes pipe one and pipe two. Figure 7 This is a first-view structural schematic diagram of the sub-connector; Figure 8 This is a structural schematic diagram of the sub-connector from a second perspective; Figure 9 This is a schematic diagram of the female connector on pipe two; Figure 10 This is a schematic diagram of the cross-sectional structure of the connector on pipe two; Figure 11 This is a schematic diagram of the female connector.

[0019] In the diagram: 100, Pipeline 1; 200, Pipeline 2; 1, Sub-connector; 11, First reduced diameter section; 12, Limiting groove; 2, Female connector; 21, Slot; 211, First open end; 22, External thread; 23, Second reduced diameter section; 24, First annular wall; 25, Second annular wall; 3, Sleeve; 31, Internal thread; 32, Second open end; 33, Shaft hole; 4, Sealing ring; 5, Limiting rib; 51, External conical surface. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] This invention provides a pipe connection connector that allows for connection simply by rotating the sleeve, simplifying operation and improving installation flexibility and reliability.

[0023] The following is combined Figures 4-11 The technical solution provided by this invention will be described in more detail below.

[0024] See Figures 4-11As shown, the pipe connection connector provided by the present invention includes a sub-connector 1, a female connector 2, and a sleeve 3, wherein: the sub-connector 1 is used to fix the connection end of pipe 100, and the female connector 2 is used to fix the connection end of pipe 200; the sleeve 3 is sleeved on the sub-connector 1 and is rotatably mounted on the sub-connector 1; the female connector 2 is provided with a slot 21, the end of the sub-connector 1 is mated with the slot 21, and when the sleeve 3 is covered on the female connector 2, the sleeve 3 can rotate outside the sub-connector 1 under the action of external force and be fixedly connected with the female connector 2, thereby screwing the sub-connector 1 into the slot 21, and thus sealingly and fixedly connecting the two pipes.

[0025] The female connector 1 and the female connector 2 are made from PEEK or other mature aerospace-grade granules / bars through injection molding. The female connector 1 can be fixed to the end of pipe 100 by welding, gluing, or compression fitting. Similarly, the female connector 2 is firmly connected to the connection end of pipe 200, and its fixing method can be the same as that of the female connector 1, such as welding, gluing, or compression fitting, without the need for any other standard parts (such as clamps) for connection.

[0026] See Figure 5 As shown in the figure, when the sleeve 3 is moved to a position covering the outside of the female connector 2, it can rotate outside the female connector 1 under the action of an external force (such as manual rotation force). During this rotation, a fixed connection is established between the sleeve 3 and the female connector 2. This fixed connection can be achieved in various ways. For example, a snap-fit ​​structure is provided between the inner wall of the sleeve 3 and the outer wall of the female connector 2, which locks when the sleeve 3 rotates to a specific position; or, the sleeve 3 and the female connector 2 are fixed by a threaded connection. Through the fixed connection between the sleeve 3 and the female connector 2 and the rotation of the sleeve 3 on the female connector 1, the end of the female connector 1 is guided and screwed into the slot 21 in the female connector 2, so that a tight fit is formed between the female connector 1 and the slot 21. Finally, the synergistic effect of the female connector 1, the female connector 2, and the sleeve 3 achieves a sealed and secure connection between the two pipes. The seal can be achieved through a tight fit between the components, for example, through precise machining tolerances or elastic deformation of the material.

[0027] Compared with existing technologies, the pipe connection connector in this embodiment eliminates components such as silicone sleeves and narrow metal clamps, simplifying the connection process to a two-step operation of insertion and rotation. The insertion and mating of the female connector 1 and the female connector 2 provides initial positioning and guiding functions, while the threaded connection between the sleeve 3 and the female connector 2 achieves final tightening and sealing.

[0028] The above structure not only reduces the number of parts and weight, but also significantly improves assembly efficiency. Actual tests show that using the connector in this embodiment effectively shortens assembly time.

[0029] Among them, see Figures 4-6 As shown, sleeve 3 is not fixed to sub-connector 1, but is movably sleeved on sub-connector 1. The user can rotate sleeve 3 to fix sleeve 3 to female connector 2. Specifically, sleeve 3 and female connector 2 are threaded together.

[0030] See Figure 5 and Figure 6 As shown, the inner wall of the sleeve 3 has an internal thread 31, and the outer wall of the female connector 2 has an external thread 22. The external thread 22 is located outside the slot 21. The internal thread 31 can cooperate with the external thread 22 to lock when the sleeve 3 rotates, so that the female connector 2 and the sleeve 3 are threadedly connected.

[0031] The engagement of the internal thread 31 and the external thread 22 is key to achieving rapid tightening. Unlike traditional clamp fastening methods, this embodiment employs a threaded connection, which is not only simpler to operate (tightening can be completed simply by rotating the sleeve 33), but also provides more uniform radial pressure, ensuring the reliability and airtightness of the connection. In particular, because the threaded connection allows for gradual increase in pressure during rotation, it avoids the problems of over-tightening or over-loosening that can occur with clamp fastening. Furthermore, the threaded connection has self-locking properties, effectively resisting the risk of loosening caused by vibration and temperature changes.

[0032] Experimental data show that the threaded connection method of this embodiment increases the tensile strength of the connection by 30%, and the connection remains stable without loosening during temperature cycling tests from -55℃ to +125℃.

[0033] As an optional implementation, see Figures 6-8 As shown, the sub-connector 1 has a first reduced diameter section 11, the outer diameter of which is smaller than the outer diameter of the rest of the sub-connector 1. The first reduced diameter section 11 is inserted into and fixed within the connection end of the corresponding pipeline; see also Figure 10 and Figure 11 As shown, the female connector 2 has a second reduced diameter section 23. The outer diameter of the second reduced diameter section 23 is smaller than the outer diameter of the external thread section 22. The second reduced diameter section 23 is inserted into the connection end of the corresponding pipeline and fixed.

[0034] See Figures 6-8 As shown, the first reduced-diameter section 11 of the sub-connector 1 refers to the portion of the sub-connector 1 with a reduced diameter in its axial direction. Its outer diameter is smaller than the diameter of the main body of the sub-connector 1, forming a stepped structure. This reduced-diameter structure allows the sub-connector 1 to be inserted into the connection end of the pipeline with a smaller diameter portion, thereby achieving an embedded connection. Similarly, the second reduced-diameter section 23 allows the female connector 2 to be tightly inserted into the pipeline 200, forming a reliable embedded fixed connection structure.

[0035] Correspondingly, the insertion end of pipe 100 can be provided with a corresponding insertion groove, thereby facilitating the insertion and bonding of the first reduced diameter section 11 into pipe 100. The insertion end of pipe 200 can have the same structure, facilitating the insertion and bonding of the second reduced diameter section 23 into pipe 200. As an optional implementation, see Figure 9 and Figure 10 The slot 21 is an annular groove and is arranged around the axis of the female connector 2; the end of the slot 21 opposite to the pipeline it fixes is the first open end 211, which is used for the insertion of the female connector 1.

[0036] See Figure 9 and Figure 10 The annular slot 21 facilitates a 360° sealed fixation between the female connector 1 and the female connector 2. The annular slot 21 also ensures a larger contact area between the female connector 1 and the female connector 2, which improves the stability and sealing of the connection.

[0037] As an optional implementation, see Figure 6 , Figures 9-11 As shown, the female connector 2 has a first annular wall 24 and a second annular wall 25, a slot 21 is formed between the first annular wall 24 and the second annular wall 25, an external thread 22 is located on the outer surface of the first annular wall 24, a sleeve 3 is threadedly connected to the first annular wall 24, a limiting groove 12 is provided on the inner wall of the female connector 1, and the second annular wall 25 is inserted into the limiting groove 12.

[0038] See Figure 9 The female connector 2 has two concentric annular structures, namely a first annular wall 24 and a second annular wall 25. The first annular wall 24 and the second annular wall 25 together define the radial range of the slot 21, so that the slot 21 forms an annular space, which facilitates the insertion and positioning of the female connector 1.

[0039] The first annular wall 24 is located on the outside of the slot 21, and the second annular wall 25 is located on the inside of the slot 21, forming an annular channel between them to accommodate the end of the female connector 1. An external thread 22 is located on the outer surface of the first annular wall 24, and the sleeve 3 is threadedly connected to the first annular wall 24. By placing the external thread 22 on the outer surface of the first annular wall 24, the torque of the threaded connection can be directly applied to the outer structure of the female connector 2, which helps to provide a stable locking force and ensures that the sleeve 3 can smoothly engage with the female connector 2 during rotation.

[0040] See Figure 8The inner wall of the sub-connector 1 is provided with a limiting groove 12, and the second annular wall 25 is inserted into the limiting groove 12. This structure ensures that the sub-connector 1 can be guided during insertion and prevents unnecessary radial or axial displacement during subsequent rotation and locking. The cooperation between the second annular wall 25 and the limiting groove 12 provides a dual limiting function. On the one hand, it ensures the precise radial alignment of the sub-connector 1 and avoids interference or misalignment between the sub-connector 1 and the wall of the slot 21. On the other hand, it also provides axial support for the sub-connector 1 and prevents axial movement during rotation.

[0041] This embodiment significantly improves the convenience and reliability of pipeline connection joints during assembly, ensuring that the female connector 1 and the female connector 2 can be stably and accurately connected, and ultimately form a reliable sealed connection.

[0042] As an optional implementation, see Figure 6 and Figure 9 As shown, a sealing ring 4 is fixed inside the slot 21. The sealing ring 4 is fixed to the end of the slot 21 and is used to abut against the end of the sub-connector 1.

[0043] The sealing ring 4 can be pressed in, glued, or held within the slot 21 by its own elasticity, ensuring that the sealing ring 4 accurately contacts and is compressed against the end of the sub-connector 1 when the sub-connector 1 is inserted. The function of the sealing ring 4 is to make tight contact with and compress the end surface of the sub-connector 1. When the sub-connector 1 is screwed into the slot 21 and reaches its final position, the end face of the sub-connector 1 will press against the sealing ring 4, as... Figure 6 As shown, the sealing ring 4 undergoes elastic deformation. The reaction force generated by the elastic deformation causes the sealing ring 4 to fit tightly between the end of the sub-joint 1 and the inner wall of the slot 21, forming an effective sealing barrier, thereby preventing fluid leakage from the connection.

[0044] As an optional implementation, see Figure 6 , Figure 7 and Figure 8 As shown, a limiting rib 5 is provided on the outer wall of the sub-connector 1. The outer diameter of the limiting rib 5 is larger than the outer diameter of the sub-connector 1 at other locations, while the outer diameter of the sub-connector 1 is smaller than the outer diameter of the pipeline it is fixed to. One end of the sleeve 3 is a second open end 32, through which the outer wall of the slot 21 can extend into the sleeve 3. The other end of the sleeve 3 is a mounting end with a shaft hole 33 through which the sub-connector 1 passes. The outer diameter of the limiting rib 5 is larger than the inner diameter of the shaft hole 33, thus confining the mounting end of the sleeve 3 between the limiting rib 5 and the corresponding pipeline. The limiting rib 5 protrudes radially from the main body of the sub-connector 1, forming a blocking surface that ensures that the limiting rib 5 can effectively engage with the shaft hole 33 of the sleeve 3, preventing the sleeve 3 from moving in a specific direction.

[0045] The above structure effectively solves the problem of axial sliding or detachment of sleeve 3 on sub-connector 1, ensuring the stability and reliability of sleeve 3 during connection operation. When sub-connector 1 is mated with female connector 2, sleeve 3 can always maintain the correct working position, facilitating its fixed connection with female connector 2. This improves the ease of operation and reliability of pipeline connection joints, and avoids connection failure or reduced efficiency due to sleeve 3 displacement.

[0046] As an optional implementation, see Figure 7 As shown, the limiting rib 5 is an annular rib arranged around the axis of the sub-joint 1. This ensures the continuity and uniformity of the limiting rib 5 in the circumferential direction of the sub-joint 1. When the mounting end of the sleeve 3 contacts the annular rib, the annular rib provides stable and uniform axial support and radial limiting for the sleeve 3. This effectively avoids problems such as uneven force, shaking, or tilting of the sleeve 3 caused by discontinuity in the structure of the limiting rib 5.

[0047] As an optional implementation, see Figure 6 and Figure 7 As shown, the limiting rib 5 has an outer conical surface 51, and the outer diameter of the outer conical surface 51 gradually decreases in the direction away from the shaft hole 33.

[0048] Since the end of the limiting rib 5 facing the internal thread 31 is a narrow end, it can prevent the limiting rib 5 from interfering with the internal thread 31 of the sleeve 3 and prevent the limiting rib 5 from affecting the rotation of the sleeve 3.

[0049] The pipe connection joint in this embodiment is installed according to the following steps: See Figures 4-11 As shown, sub-connector 1 is fixed to the connection end of pipe 100. Sub-connector 1 has a first reduced diameter section 11, which is inserted into and fixed to the connection end of the corresponding pipe. Female connector 2 is fixed to the connection end of pipe 200. Female connector 2 has a second reduced diameter section 23, which is inserted into and fixed to the connection end of pipe 200.

[0050] When connecting two pipes, the operator aligns the end of the female connector 1 with the first open end 211 of the slot 21 of the female connector 2, rotates the sleeve 3, and gradually threadedly connects the sleeve 3 with the external thread 22 of the female connector 2, inserting the female connector 1 into the slot 21. As the sleeve 3 rotates, after installation, the female connector 1 is further screwed into the slot 21, and the sealing ring 4 is compressed, ensuring a sealed and fixed connection between the two pipes. A limiting groove 12 is provided on the inner wall of the female connector 1, and the second annular wall 25 of the female connector 2 is inserted into the limiting groove 12. The first annular wall 24 of the female connector 2 enters between the sleeve 3 and the female connector 1, further ensuring the mating position of the female connector 1 and the female connector 2.

[0051] Compared to existing technologies that require multiple components such as connector corrugations, silicone sleeves, and two metal clamps, and involve complex connection methods involving step-by-step sleeve installation, connector insertion, position adjustment, and clamp fixing, this embodiment significantly reduces the number of components through the structural arrangement of sub-connector 1, female connector 2, and sleeve 3. The connection process is simplified to the mating of sub-connector 1 and female connector 2 and the tightening of sleeve 3, avoiding the independent installation and adjustment of multiple components and improving assembly efficiency. Furthermore, the connection structure is compact and highly reliable.

[0052] Example 2 See Figures 4-6 As shown, this embodiment provides a low-pressure pipeline for an aviation environmental control system, including pipelines and pipeline connection joints, with the pipelines being sealed and fixed together by the pipeline connection joints.

[0053] This joint, through the coordinated action of the female connector 1, the female connector 2, and the sleeve 3, mechanically secures and seals the two pipelines. The sealed fixation between pipelines via this pipe connection joint means that when connecting two pipelines, the joint effectively prevents fluid (such as air or gas) leakage at the connection point, while simultaneously providing sufficient mechanical strength to resist external loads and vibrations. This pipe connection joint prevents fluid leakage, ensures the stability of low-pressure pipelines during long-term operation and in complex environments, and avoids system failures due to loose connections or malfunctions.

[0054] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pipe connection fitting, characterized in that, Includes male connector, female connector and sleeve, wherein: The sub-connector is used to fix the connection end of one of the pipes, and the female connector is used to fix the connection end of the other pipe. The sleeve is fitted over the sub-joint and is rotatably mounted on the sub-joint; The female connector is provided with a slot, and the end of the female connector is mated with the slot. When the sleeve is placed outside the female connector, the sleeve can rotate outside the female connector under the action of external force and be fixedly connected with the female connector, thereby screwing the female connector into the slot and sealingly connecting the two pipes.

2. The pipe connection joint according to claim 1, characterized in that, The inner wall of the sleeve has an internal thread, and the outer wall of the female connector has an external thread. The external thread is located outside the slot. The internal thread can engage with the external thread to lock the sleeve when it rotates, thereby connecting the female connector to the sleeve in a threaded connection.

3. The pipe connection joint according to claim 2, characterized in that, The sub-connector has a first reduced diameter section, the outer diameter of which is smaller than the outer diameter of the rest of the sub-connector, and the first reduced diameter section is inserted into the connection end of the corresponding pipeline and fixed therein. The female connector has a second reduced diameter section, the outer diameter of which is smaller than the outer diameter of the external threaded portion. The second reduced diameter section is inserted into and fixed within the connection end corresponding to the pipeline.

4. The pipe connection joint according to claim 2, characterized in that, The slot is an annular groove, and the slot is arranged around the axis of the female connector; The end of the slot opposite to the pipe it is fixed to is the first open end, which is used for the insertion of the sub-connector.

5. The pipe connection joint according to claim 4, characterized in that, The female connector has a first annular wall and a second annular wall, the slot is formed between the first annular wall and the second annular wall, the external thread is located on the outer surface of the first annular wall, the sleeve is threadedly connected to the first annular wall, and a limiting groove is provided on the inner wall of the female connector, the second annular wall is inserted into the limiting groove.

6. The pipe connection joint according to claim 1, characterized in that, A sealing ring is fixed inside the slot and is fixed to the end of the slot. The sealing ring is used to abut against the end of the sub-connector.

7. The pipe connection joint according to claim 1, characterized in that, The outer wall of the sub-connector is provided with a limiting rib, the outer diameter of which is larger than the outer diameter of the other positions of the sub-connector, and the outer diameter of the sub-connector is smaller than the outer diameter of the pipeline to which it is fixed. One end of the sleeve is a second open end, and the outer wall of the slot can extend into the sleeve from the second open end; The other end of the sleeve is the mounting end, which has a shaft hole. The sub-connector passes through the shaft hole, and the outer diameter of the limiting rib is larger than the inner diameter of the shaft hole, thereby limiting the mounting end of the sleeve between the limiting rib and the corresponding pipeline.

8. The pipe connection joint according to claim 7, characterized in that, The limiting rib is an annular rib arranged around the axis of the sub-joint.

9. The pipe connection joint according to claim 7, characterized in that, The limiting rib has an outer conical surface, and the outer diameter of the outer conical surface gradually decreases in the direction away from the shaft hole.

10. A low-pressure pipeline for an aviation environmental control system, characterized in that, It includes pipelines and pipeline connection joints as described in any one of claims 1-9, wherein the pipelines are sealed and fixed together by the pipeline connection joints.

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