Connecting pipe assembly and through-wall connector thereof

Abstract

The utility model discloses a connecting pipe assembly and a wall-passing connector thereof, and relates to the technical field of pipeline connectors. The wall-passing joint comprises an internal threaded pipe, a first threaded pipe and a second threaded pipe, the internal threaded pipe is used for being arranged on the container wall, and the internal threaded pipe penetrates through the container wall; the outer threaded pipe is connected into the inner threaded pipe in a threaded and sleeved mode; any one end or two ends of the external thread pipe is / are provided with a connecting structure; the connecting structure is used for being detachably connected with the connecting pipe; the limiting ring is arranged on the outer side wall of the outer threaded pipe; the first sealing ring is movably arranged outside the outer threaded pipe in a sleeving mode, and the first sealing ring is located between the limiting ring and the inner threaded pipe. Through the arrangement of the inner threaded pipe and the outer threaded pipe, after the connecting pipe is connected with the wall of the container, the inner threaded pipe and the outer threaded pipe have good pressure difference resistance, and in other words, a high-pressure medium in the container is not prone to leaking from the joint between the inner threaded pipe and the outer threaded pipe.

Description

Technical Field

[0001] This application relates to the field of pipe fitting technology, specifically a connecting pipe assembly and its wall-passing joint. Background Technology

[0002] A gas turbine is an internal combustion engine that uses a continuously flowing gas as its working fluid to drive a turbine at high speed, converting the energy of fuel into useful work. It mainly consists of several major components, including a compressor, combustion chamber, turbine, and auxiliary systems. In operation, the gas turbine injects compressed air into the combustion chamber via the compressor. The compressed air reacts with the fuel in the combustion chamber to produce high-temperature gas, which drives the turbine to rotate and perform work. In other words, the gas turbine uses a simple cycle to convert the chemical energy of the fuel into thermal energy, and then converts some of the thermal energy into mechanical energy.

[0003] It is important to note that in the auxiliary systems of gas turbines, some pipes need to pass through the walls of sealed containers such as fuel tanks and extend into the interior of the container. In existing technologies, such as... Figure 1 As shown, common methods for connecting pipes to the container wall include welding the connecting pipe (e.g., the first connecting pipe 2 or the second connecting pipe 3) to the container wall 1, or threading the connecting pipe to the container wall 1. If the connecting pipe is welded to the container wall 1, it is not easy to disassemble and maintain the box or the connecting pipe; if the connecting pipe is threaded to the container wall 1, the pressure resistance at the connection between the connecting pipe and the container wall 1 is poor, and it is easy for gas and liquid to leak. Utility Model Content

[0004] The purpose of this application is to provide a connecting pipe assembly and its wall-connecting joint to solve the technical problems that either the connecting pipe has poor pressure resistance or is difficult to disassemble and assemble after it is connected to the container wall.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, this application proposes a wall-connecting connector, which is applied to a container wall and a connecting pipe, the wall-connecting connector comprising:

[0007] An internally threaded tube is provided on the container wall and penetrates the container wall;

[0008] An externally threaded tube is threaded into the interior of an internally threaded tube; a connecting structure is provided at either one or both ends of the externally threaded tube; the connecting structure is used to form a detachable connection with the connecting tube.

[0009] A limiting ring is disposed on the outer side wall of the externally threaded pipe;

[0010] The first sealing ring is movably sleeved on the outside of the external threaded tube, and the first sealing ring is located between the limiting ring and the internal threaded tube.

[0011] As a specific embodiment of the technical solution in this application, the axial length of the internally threaded tube is greater than or equal to twice the thickness of the container wall and less than or equal to six times the thickness of the container wall.

[0012] As a specific solution in this application, a first sealing groove is provided between the limiting ring and the internally threaded pipe; the first sealing ring is located in the first sealing groove; the opening diameter of the first sealing groove is smaller than the maximum diameter of the first sealing groove.

[0013] As a specific solution in this application, the connection structure includes an external thread disposed on the outer side wall of the externally threaded pipe or an internal thread disposed on the inner side wall of the externally threaded pipe; or, the connection structure includes a first flange disposed on the externally threaded pipe.

[0014] Secondly, this application proposes a connecting pipe assembly comprising a wall-mounted connector as described in any of the first aspects and at least one connecting pipe.

[0015] As a specific solution in this application, a second sealing groove is provided between the connecting pipe and the external threaded pipe, and a second sealing ring is provided inside the second sealing groove.

[0016] As a specific embodiment of the technical solution in this application, the diameter of the second sealing groove increases along the first direction; the first direction is parallel to the axis of the external threaded pipe and points from the inside of the external threaded pipe to the outside.

[0017] As a specific embodiment of the technical solution in this application, the connecting pipe is further provided with a wedge-shaped ring; the thickness of the wedge-shaped ring increases along the first direction; the wedge-shaped ring is located between the connecting pipe and the second sealing ring.

[0018] As a specific embodiment of the technical solution in this application, the wedge-shaped ring has an annular inner wall; the second sealing groove has an annular outer wall opposite to the annular inner wall; the annular inner wall and the annular outer wall are arranged in parallel.

[0019] As a specific solution in this application, the connecting pipe includes a pipe body and a clamping nut; the clamping nut is movably sleeved on the outside of the pipe body, and the clamping nut can be threadedly connected to the external threaded pipe; after the clamping nut is threadedly connected to the external threaded pipe, it can restrict the relative displacement between the pipe body and the external threaded pipe.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] This application, through the design of internally and externally threaded pipes, ensures good pressure differential resistance between the internally and externally threaded pipes after they are connected to the container wall. This means that high-pressure media inside the container is less likely to leak from the connection between the internally and externally threaded pipes. Furthermore, the internally and externally threaded pipes form a detachable connection through the threads, facilitating easy disassembly and assembly of the connecting pipes and aiding in subsequent maintenance and repair. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of the connection between the container wall and the connecting pipe in the prior art;

[0023] Figure 2 This is a cross-sectional schematic diagram illustrating the use of a through-wall joint to connect the container wall and the connecting pipe, as proposed in an embodiment of this application.

[0024] Figure 3 This is a cross-sectional schematic diagram illustrating the use of another type of wall-mounted joint to connect the container wall and the connecting pipe, as proposed in an embodiment of this application.

[0025] Figure 4 This is a cross-sectional schematic diagram illustrating the use of yet another type of wall-mounted joint to connect the container wall and the connecting pipe, as proposed in an embodiment of this application.

[0026] Figure 5 for Figure 4 An enlarged view of part A in the middle;

[0027] Figure 6 for Figure 4 Another enlarged view of part A in the middle;

[0028] Figure 7 for Figure 4 Another enlarged view of part A in the middle;

[0029] Figure 8 for Figure 7 Enlarged view of section C.

[0030] In the diagram: 1. Container wall; 2. First connecting pipe; 21. Pipe body; 22. Compression nut; 3. Second connecting pipe; 31. Second flange; 32. Wedge ring; 321. Annular inner wall; 4. Internally threaded pipe; 5. Externally threaded pipe; 51. Limiting ring; 52. Second sealing groove; 521. Annular outer wall; 53. First flange; 54. First sealing groove; 6. First sealing ring; 7. Second sealing ring. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that in the description of this application, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0035] Before understanding the embodiments of this application, it should be noted that, in order to simplify the drawings and enable those skilled in the art to clearly see the specific structure of the various parts proposed in the embodiments of this application, the threads of all components (e.g., internal threaded pipe 4, external threaded pipe 5, and clamping nut 22, etc. mentioned below) are omitted in the drawings of this application.

[0036] To address the technical problems in existing technologies where, after a connecting pipe (i.e., the first connecting pipe 2 or the second connecting pipe 3 hereinafter) is connected to the container wall, either the connecting pipe has poor pressure resistance or is difficult to disassemble and assemble, this application proposes an embodiment of a wall-through joint, which is applied to the container wall 1 and the connecting pipe. Specifically, the wall-through joint includes an internally threaded pipe 4 and an externally threaded pipe 5. In this embodiment, as... Figures 2 to 4 As shown. An internally threaded tube 4 is installed on the container wall 1 and penetrates the container wall 1. An externally threaded tube 5 is sleeved inside the internally threaded tube 4, and a threaded connection is formed between the externally threaded tube 5 and the internally threaded tube 4. A connecting structure is provided at either end or both ends of the externally threaded tube 5, and the connecting structure is used to form a detachable connection with the connecting tube.

[0037] In the embodiments of this application, there are no restrictions on the container with container wall 1. For example, it can be a container for storing lubricating oil, fuel oil or compressed air.

[0038] In the embodiments of this application, the internally threaded pipe 4 can be disposed on the container wall 1 in any reasonable manner. The only requirement is that the medium inside the container (e.g., lubricating oil, fuel oil, or compressed air) will not leak from the connection between the internally threaded pipe 4 and the container wall 1 after the internally threaded pipe 4 is disposed on the container wall 1. In one specific embodiment, the internally threaded pipe 4 is disposed on the container wall 1 by welding.

[0039] Existing technologies such as Figure 1 As shown, if the first connecting pipe 2 or the second connecting pipe 3 is directly threaded to the container wall 1, and the pressure change inside the container is large, it will cause slight deformation of the container wall 1. If the container wall 1 deforms slightly, the threaded connection between the first connecting pipe 2 or the second connecting pipe 3 and the container wall 1 will also deform. If the threaded connection between the first connecting pipe 2 or the second connecting pipe 3 and the container wall 1 deforms, the high-pressure medium inside the container is prone to leak from the threaded connection between the connecting pipe and the container wall 1.

[0040] This application utilizes the internally threaded pipe 4 and a threaded connection between the externally threaded pipe 5 and the internally threaded pipe 4, allowing the connecting pipe to be directly connected to the externally threaded pipe 5. Even if significant pressure changes occur inside the container, causing slight deformation of the container wall 1, this slight deformation is unlikely to affect the sealing performance of the threaded connection between the externally threaded pipe 5 and the internally threaded pipe 4. If the sealing performance of the threaded connection between the externally threaded pipe 5 and the internally threaded pipe 4 is not affected, the high-pressure medium inside the container is unlikely to leak through the connection between the externally threaded pipe 5 and the internally threaded pipe 4.

[0041] In this embodiment, the shorter the length of the internally threaded tube 4, the more easily the sealing performance of the threaded connection between the externally threaded tube 5 and the internally threaded tube 4 is affected by the deformation of the container wall 1. If the length of the internally threaded tube 4 is too long, it will increase the manufacturing cost, and the longer the internally threaded tube 4 itself is also prone to deformation. If the internally threaded tube 4 itself is deformed, it will also affect the sealing performance of the threaded connection between the externally threaded tube 5 and the internally threaded tube 4. After extensive research, the inventors found that in order to ensure good threaded connection sealing performance between the externally threaded tube 5 and the internally threaded tube 4 during long-term use, the axial length of the internally threaded tube 4 (i.e., the length of the internally threaded tube 4) is... Figure 2 The length S2 shown can be greater than or equal to twice the thickness of the container wall 1 (i.e., as shown) Figure 2 The thickness S1 shown is less than or equal to 6 times the thickness of the container wall 1.

[0042] To further improve the sealing performance of the connection between the externally threaded pipe 5 and the internally threaded pipe 4, and to prevent leakage of high-pressure medium from the container through the connection between the externally threaded pipe 5 and the internally threaded pipe 4, in one embodiment of this application, the through-wall connector may further include a limiting ring 51 and a first sealing ring 6. Specifically, as shown... Figures 2 to 4 As shown, the limiting ring 51 is disposed on the outer wall of the externally threaded pipe 5. The first sealing ring 6 is movably sleeved on the outside of the externally threaded pipe 5, and the first sealing ring 6 is located between the limiting ring 51 and the internally threaded pipe 4. In use, by rotating the externally threaded pipe 5, the first sealing ring 6 is squeezed between the limiting ring 51 and the internally threaded pipe 4, thereby improving the sealing performance of the connection between the externally threaded pipe 5 and the internally threaded pipe 4.

[0043] In the embodiments of this application, there are no restrictions on the shape and structure of the first sealing ring 6, as long as it can enhance the sealing effect. For example, the first sealing ring 6 can be as follows: Figure 3 The O-ring shown has a circular cross-section, and can also be... Figure 2 The square-shaped sealing ring shown has a square cross-section. The second sealing ring 7 mentioned below is also like this, and will not be described again later.

[0044] To further improve the sealing performance of the connection between the externally threaded pipe 5 and the internally threaded pipe 4, in one embodiment of this application, such as Figure 3 As shown, a first sealing groove 54 is provided between the limiting ring 51 and the internally threaded pipe 4. The first sealing ring 6 is located within the first sealing groove 54, and the opening diameter of the first sealing groove 54 (i.e., as shown in the figure) is... Figure 3 The diameter S3 shown is smaller than the maximum diameter of the first sealing groove 54 (i.e., as shown in the figure). Figure 3 (as shown in the diameter S4). Because the opening diameter of the first sealing groove 54 is small, after the external threaded pipe 5 and the internal threaded pipe 4 are connected in place, the first sealing groove 54 can apply pressure to the first sealing ring 6. This pressure can drive the first sealing ring 6 to fit tightly against the connection between the external threaded pipe 5 and the internal threaded pipe 4, thereby improving the sealing performance of the connection between the external threaded pipe 5 and the internal threaded pipe 4.

[0045] It should be noted that the number of connecting pipes used may vary in different application scenarios. That is, in the embodiments of this application, the connecting pipes may include a first connecting pipe 2 and / or a second connecting pipe 3. The connection method and structure between the first connecting pipe 2 and the second connecting pipe 3 and the external threaded pipe 5 can be similar. To avoid redundancy, in the following description, only the embodiments of this application are illustrated based on the first connecting pipe 2 or the second connecting pipe 3. It should be understood that the embodiments described with the first connecting pipe 2 as the core can also be applied to the second connecting pipe 3; of course, the embodiments described with the second connecting pipe 3 as the core can also be applied to the first connecting pipe 2, which will not be elaborated further.

[0046] In the embodiments of this application, since the connecting structure is used to enable a detachable connection between the externally threaded pipe 5 and the connecting pipe (i.e., the first connecting pipe 2 or the second connecting pipe 3), in this embodiment, the connecting structure can be any detachable connecting structure provided on the externally threaded pipe 5. For example, the connecting structure can be an external thread provided on the outer wall of the externally threaded pipe 5, and in use, such as... Figure 2 As shown, the first connecting pipe 2 and the second connecting pipe 3 can be detachably connected to the externally threaded pipe 5 via the external thread. Alternatively, the connection structure can be an internal thread located on the inner wall of the externally threaded pipe 5, allowing the connecting pipe to also be detachably connected to the externally threaded pipe 5 via the internal thread. The connection structure can also be a first flange 53, which is located on the externally threaded pipe 5. For example... Figure 6 As shown, the second connecting pipe 3 is provided with a second flange 31. In use, the external threaded pipe 5 and the second connecting pipe 3 can be threaded together through the first flange 53 and the second flange 31.

[0047] The embodiment of the wall-connecting joint proposed in this application, through the arrangement of internal and external threaded pipes, ensures good pressure differential resistance between the internal and external threaded pipes after the connecting pipe is connected to the container wall. This means that the high-pressure medium inside the container is less likely to leak from the connection between the internal and external threaded pipes. Furthermore, the internal and external threaded pipes form a detachable connection through the threads, facilitating disassembly and assembly of the connecting pipe and aiding in subsequent maintenance and repair.

[0048] Having described the wall-passing connector proposed in the embodiments of this application, the following describes an embodiment of a connecting pipe assembly proposed in this application, which includes the wall-passing connector as described in any of the above embodiments and at least one connecting pipe.

[0049] The embodiment of the connecting pipe assembly proposed in this application has an internally threaded pipe and an externally threaded pipe. Due to the presence of the internally and externally threaded pipes, after the connecting pipe is connected to the container wall, there is good pressure difference resistance between the internally and externally threaded pipes, meaning that the high-pressure medium inside the container is not easily leaked from the connection between the internally and externally threaded pipes. Furthermore, the internally and externally threaded pipes form a detachable connection through the threads, which makes it easy to disassemble and assemble the connecting pipe, facilitating subsequent maintenance and repair.

[0050] In the embodiments of this application, there are no restrictions on the shape and structure of the connecting pipe. It is only necessary that it can form a detachable connection with the externally threaded pipe 5. For example: Figure 2 As shown, threads can be directly provided on the inner wall of the connecting pipe so that the connecting pipe and the externally threaded pipe 5 can be threadedly connected. Alternatively, as... Figure 6As shown, a second flange 31 can be directly installed on the connecting pipe (i.e., the second connecting pipe 3), and the externally threaded pipe 5 and the connecting pipe can be detachably connected through the second flange 31 and the first flange 53 installed on the externally threaded pipe 5. Alternatively, the connecting pipe may include a pipe body 21 and a clamping nut 22. Figure 3 As shown, the clamping nut 22 is movably sleeved on the outside of the pipe body 21, and the clamping nut 22 can be threadedly connected to the externally threaded pipe 5. After the clamping nut 22 is threadedly connected to the externally threaded pipe 5, it can restrict the relative displacement between the pipe body 21 and the externally threaded pipe 5. In use, the clamping nut 22 forms a detachable connection between the connecting pipe and the externally threaded pipe 5.

[0051] It is important to understand that a detachable connection is formed between the connecting pipe and the externally threaded pipe 5. If the seal is poor, there is a possibility of leakage at the connection between the connecting pipe and the externally threaded pipe 5. To improve the sealing performance between the connecting pipe and the externally threaded pipe 5, in one embodiment of this application, such as... Figure 5 As shown, a second sealing groove 52 can also be provided between the connecting pipe (i.e., the second connecting pipe 3) and the externally threaded pipe 5, and a second sealing ring 7 is provided inside the second sealing groove 52. By providing the second sealing ring 7, the sealing performance between the connecting pipe and the externally threaded pipe 5 can be improved.

[0052] To further improve the sealing performance between the connecting pipe and the externally threaded pipe 5, in one embodiment of this application, such as Figure 7 As shown, the diameter of the second sealing groove 52 increases along the first direction, which is parallel to the axis of the externally threaded pipe 5 and points from the inside of the externally threaded pipe 5 to the outside. Figure 7 As shown, since the diameter of the second sealing groove 52 increases along the first direction, the internal accommodating space of the second sealing groove 52 shrinks drastically during the tightening of the second connecting pipe 3 and the external threaded pipe 5. This reduced accommodating space allows the outer wall of the second sealing ring 7 to come into close contact with the inner wall of the second sealing groove 52. The greater the contact force between the second sealing ring 7 and the second sealing groove 52, the better the sealing performance between the connecting pipe (i.e., the second connecting pipe 3) and the external threaded pipe 5.

[0053] To ensure sufficient contact between the outer wall of the second sealing ring 7 and the inner wall of the second sealing groove 52, in this embodiment, the cross-sections of the second sealing ring 7 and the second sealing groove 52 can be similar, for example: Figure 7 As shown, the cross-section of the second sealing groove 52 is trapezoidal, so the cross-section of the second sealing ring 7 can also be trapezoidal.

[0054] To further improve the sealing performance between the connecting pipe and the externally threaded pipe 5, such as Figure 8As shown, the connecting pipe is also provided with a wedge-shaped ring 32. The thickness of the wedge-shaped ring 32 increases along the first direction, and the wedge-shaped ring 32 is located between the connecting pipe and the second sealing ring 7. In this embodiment, the contact force between the second sealing ring 7 and the second sealing groove 52 can be adjusted by the wedge-shaped ring 32. If the volume of the wedge-shaped ring 32 is larger, the accommodating space inside the second sealing groove 52 will be smaller after the second connecting pipe 3 and the external threaded pipe 5 are connected, that is, the contact force between the second sealing ring 7 and the second sealing groove 52 will be greater, and the sealing performance will be better.

[0055] In this embodiment, the wedge ring 32 can be integrally formed with the connecting pipe (i.e., the second connecting pipe 3). If the wedge ring 32 and the connecting pipe are integrally formed, it is difficult to adjust the contact force between the second sealing ring 7 and the second sealing groove 52 based on usage requirements. To facilitate adjustment of the contact force between the second sealing ring 7 and the second sealing groove 52 during use, in this embodiment, it can be as follows: Figure 8 As shown, the wedge ring 32 can form a detachable connection with the connecting pipe. In use, wedge rings 32 of different volumes can be replaced according to the required resistance force to ensure that the resistance force between the second sealing ring 7 and the second sealing groove 52 meets the usage requirements.

[0056] In the embodiments of this application, there are no restrictions on the shape and structure of the wedge ring 32, as long as it can reduce the accommodating space of the second sealing groove 52. As mentioned above, the greater the contact force between the second sealing ring 7 and the outer wall of the second sealing groove 52, the better the sealing performance between the connecting pipe and the external threaded pipe 5. In order to concentrate the contact force between the second sealing ring 7 and the second sealing groove 52 on the annular outer wall 521 of the second sealing groove 52, that is, to maximize the contact force between the second sealing ring 7 and the second sealing groove 52 without changing the volume of the wedge ring 32, thereby improving the sealing effect, in one embodiment of this application, such as Figure 8 As shown, the wedge-shaped ring 32 has an annular inner wall 321, which is opposite to the annular outer wall 521 of the second sealing groove 52, and the annular inner wall 321 and the annular outer wall 521 are arranged in parallel. Since the annular inner wall 321 and the annular outer wall 521 are opposite to each other and arranged in parallel, after the connecting pipe is connected to the external threaded pipe 5, the contact force formed by the second sealing ring 7 and the second sealing groove 52 can be concentrated on the annular outer wall 521 of the second sealing groove 52, that is, the sealing effect between the connecting pipe and the external threaded pipe 5 is improved.

[0057] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wall-connecting connector, applied to a container wall (1) and a connecting pipe, characterized in that, The through-wall connector includes: An internally threaded tube (4) is provided on the container wall (1), and the internally threaded tube (4) penetrates the container wall (1); An externally threaded tube (5) is threaded into the interior of the internally threaded tube (4); a connecting structure is provided at either end or both ends of the externally threaded tube (5); the connecting structure is used to form a detachable connection with the connecting tube. A limiting ring (51) is provided on the outer side wall of the externally threaded tube (5); The first sealing ring (6) is movably sleeved on the outside of the external threaded tube (5), and the first sealing ring (6) is located between the limiting ring (51) and the internal threaded tube (4).

2. The wall-mounted connector according to claim 1, characterized in that, The length of the internally threaded tube (4) along the axial direction is greater than or equal to twice the thickness of the container wall (1) and less than or equal to six times the thickness of the container wall (1).

3. The through-wall connector according to claim 1, characterized in that, A first sealing groove (54) is provided between the limiting ring (51) and the internal threaded tube (4); the first sealing ring (6) is located in the first sealing groove (54); the opening diameter of the first sealing groove (54) is smaller than the maximum diameter of the first sealing groove (54).

4. The wall-mounted joint according to any one of claims 1 to 3, characterized in that, The connection structure includes an external thread disposed on the outer side wall of the externally threaded pipe (5) or an internal thread disposed on the inner side wall of the externally threaded pipe (5); or, the connection structure includes a first flange (53) disposed on the externally threaded pipe (5).

5. A connecting pipe assembly, characterized in that, Includes the wall-mounted joint as described in any one of claims 1 to 4, and at least one connecting pipe.

6. The connecting pipe assembly according to claim 5, characterized in that, A second sealing groove (52) is provided between the connecting pipe and the external threaded pipe (5), and a second sealing ring (7) is provided inside the second sealing groove (52).

7. The connecting pipe assembly according to claim 6, characterized in that, The diameter of the second sealing groove (52) increases along the first direction; the first direction is parallel to the axis of the external threaded tube (5) and points from the inside of the external threaded tube (5) to the outside.

8. The connecting pipe assembly according to claim 7, characterized in that, The connecting pipe is also provided with a wedge ring (32); the thickness of the wedge ring (32) increases along the first direction; the wedge ring (32) is located between the connecting pipe and the second sealing ring (7).

9. The connecting pipe assembly according to claim 8, characterized in that, The wedge-shaped ring (32) has an annular inner wall (321); the second sealing groove (52) has an annular outer wall (521) opposite to the annular inner wall (321); the annular inner wall (321) and the annular outer wall (521) are arranged in parallel.

10. The connecting pipe assembly according to claim 5, characterized in that, The connecting pipe includes a pipe body (21) and a clamping nut (22); the clamping nut (22) is movably sleeved on the outside of the pipe body (21), and the clamping nut (22) can be threadedly connected to the external threaded pipe (5); after the clamping nut (22) is threadedly connected to the external threaded pipe (5), it can restrict the relative displacement between the pipe body (21) and the external threaded pipe (5).

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