Connecting assembly

Abstract

The utility model provides a connecting assembly, which comprises a first connecting assembly and a second connecting assembly, the first connecting assembly comprises a first main body section and a first connecting section, the first connecting section is provided with a first connecting part, and the first connecting section is provided with a first end face; the second connecting assembly comprises a second main body section and a second connecting section, the second main body section is provided with a second end face used for abutting against the first end face, a second connecting part is arranged on the second connecting section, and the first connecting part is connected and matched with the second connecting part; the first sealing structure and the second sealing structure are arranged at an interval, the first sealing structure is arranged between the first end face and the second end face, and the first sealing structure is arranged around the outer edge of the second connecting section; the second sealing structure is arranged on the side, close to the communicating position of the first communicating cavity and the second communicating cavity, of the matching position of the first connecting part and the second connecting part. According to the technical scheme, the technical problem that in the prior art, the sealing effect of a connector is poor can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of connection devices, in particular to a connection component. Background Art

[0002] At present, in the process of transporting high-pressure fluid, flexible pipes are usually used to transport the fluid. In order to facilitate the connection between the flexible pipe and the pipeline at the work site, the end of the conventional flexible pipe is provided with a detachable joint, so that different joints can be selected according to different on-site equipment. In order to avoid leakage of high-pressure fluid when flowing through the joint, a seal is usually provided at the connection port between the inner cavity of the joint and the flexible pipe.

[0003] However, the existing joints are usually only provided with a seal near the connection port. Under the action of high-pressure fluid, it is difficult to effectively ensure the sealing of the joint, which can easily lead to fluid leakage and cause production safety accidents. Utility Model Content

[0004] The main purpose of the utility model is to provide a connection assembly to solve the technical problem of poor joint sealing effect in the prior art.

[0005] In order to achieve the above object, the utility model provides a connection assembly, comprising:

[0006] A first connecting assembly, the first connecting assembly having a first communicating cavity, the first connecting assembly comprising a first main body section and a first connecting section connected to each other, a first connecting portion being arranged on an inner side wall of the first connecting section, and an end of the first connecting section away from the first main body section having a first end surface;

[0007] A second connecting component, the second connecting component has a second connecting cavity, the second connecting component includes a second main body section and a second connecting section connected to each other, one end of the second main body section close to the second connecting section has a second end face for abutting against the first end face, and a second connecting portion for matching with the first connecting portion is provided on the outer side wall of the second connecting section, and the first connecting portion is connected and matched with the second connecting portion to connect the first connecting cavity with the second connecting cavity;

[0008] A first sealing structure and a second sealing structure are arranged at intervals, the first sealing structure is arranged between the first end face and the second end face, and the first sealing structure is arranged around the outer edge of the second connecting section; the second sealing structure is arranged between the first connecting section and the second connecting section, and the second sealing structure is arranged on one side of the connecting point of the first connecting part and the second connecting part close to the connecting point of the first connecting cavity and the second connecting cavity.

[0009] Furthermore, at least a portion of one end of the second connecting segment away from the second main body segment is used to abut against at least a portion of the first connecting segment, and the first connecting segment and the second connecting segment are clamped on the second sealing structure.

[0010] Furthermore, the second sealing structure is arranged around the connecting point between the first connecting cavity and the second connecting cavity, and the matching points between the second sealing structure and the first connecting part and the second connecting part are arranged at intervals along the radial direction of the second connecting section.

[0011] Furthermore, the second connecting section is provided with an installation groove arranged around the connection point between the first communicating cavity and the second communicating cavity, the installation groove is adapted to the shape of the second sealing structure, and the second sealing structure is installed in the installation groove;

[0012] The first connecting section includes a connecting pipe section and a positioning protrusion that are connected to each other. The first connecting part is located on the inner wall of the connecting pipe section. The positioning protrusion is spaced apart from and arranged opposite to the first connecting part. The positioning protrusion and the first connecting part form a first positioning groove that is adapted to the end of the second connecting section. The positioning protrusion has a positioning end face and a first positioning inclined surface that are connected to each other. The positioning end face is arranged at the notch of the mounting groove. The positioning end face is used to abut and position the second sealing structure. The end of the second connecting section away from the second main body section has a second positioning inclined surface that is adapted to abut against the first positioning inclined surface. The second positioning inclined surface is arranged at the notch of the mounting groove.

[0013] Furthermore, a second positioning groove is provided on the first connecting section, the second positioning groove is matched with the end of the second connecting section, and one end of the second connecting section close to the first connecting section abuts against the bottom of the second positioning groove;

[0014] Among them, a first positioning step is arranged on the first connecting section, and the first positioning step is located at the notch of the second positioning groove. A second positioning step is arranged on the second connecting section opposite to the first positioning step. The second positioning step is arranged at intervals from the first positioning step to enclose an installation space adapted to the second sealing structure.

[0015] Furthermore, the installation space and the matching parts of the first connecting part and the second connecting part are arranged at intervals along the axial direction of the first connecting section.

[0016] Further, the second sealing structure comprises:

[0017] A first retaining ring and a second retaining ring are arranged at intervals, the first retaining ring has a sealing portion and an inserting portion connected to each other, the sealing portion abuts and seals against the end surface of the first positioning step, and the second retaining ring is installed at the end surface of the second positioning step, and the second retaining ring abuts and seals against the end surface of the second positioning step;

[0018] The sealing member is arranged between the first retaining ring and the second retaining ring, and has an inserting groove on the sealing member, the inserting groove is arranged toward the inserting portion, the inserting portion is inserted in the inserting groove, the annular outer wall surface of the sealing member abuts and seals with the side wall surface of the first positioning step, and the annular inner wall surface of the sealing member abuts and seals with the side wall surface of the second positioning step.

[0019] Further, the first connection portion is an internal thread, and the second connection portion is an external thread;

[0020] Wherein, a first disassembly groove is provided on the outer wall surface of the first connecting section, and the first disassembly groove is adapted to the shape of the first disassembly rod; and / or,

[0021] A second disassembly groove is arranged on one side of the second main body section close to the second connecting section. The second disassembly groove is located on the outer wall surface of the second main body section. The second disassembly groove is adapted to the shape of the second disassembly rod.

[0022] Further, the first connecting portion is an internal thread, the second connecting portion is an external thread, and a second disassembly groove is provided on one side of the second main body section close to the second connecting section, and the second disassembly groove is adapted to the shape of the second disassembly rod;

[0023] There are multiple second disassembly grooves, and the multiple second disassembly grooves are arranged at intervals along the circumference of the second main body section.

[0024] Furthermore, the first main body section is a union joint, a flange joint, a clamp joint, or a swivel flange joint.

[0025] By applying the technical solution of the utility model, a double seal can be formed between the first connection component and the second connection component by arranging the first sealing structure between the first end face and the second end face, and arranging the second sealing structure at the side of the connection between the first connection part and the second connection part close to the connection between the first communication cavity and the second communication cavity, so as to effectively prevent fluid leakage. Therefore, the connection component provided by this embodiment can solve the technical problem of poor joint sealing effect in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0027] Figure 1 A cross-sectional structural schematic diagram according to the first embodiment of the present utility model is shown;

[0028] Figure 2 Shows Figure 1 Schematic diagram of the local enlarged structure in;

[0029] Figure 3 A cross-sectional structural schematic diagram according to the second embodiment of the present utility model is shown;

[0030] Figure 4 Shows Figure 3 Schematic diagram of the local enlarged structure in;

[0031] Figure 5 Shows a left view provided according to the first embodiment of the utility model;

[0032] Figure 6 A schematic cross-sectional structure diagram according to the third embodiment of the present utility model is shown;

[0033] Figure 7 Shows a left view provided according to the third embodiment of the present utility model;

[0034] Figure 8 A schematic cross-sectional structure diagram according to the fourth embodiment of the present utility model is shown;

[0035] Fig. 9 Shows a left view provided according to the fourth embodiment of the utility model;

[0036] Fig.10 A cross-sectional structural schematic diagram according to Embodiment 5 of the present utility model is shown;

[0037] Fig.11 A left view according to the fifth embodiment of the present utility model is shown.

[0038] The above drawings include the following reference numerals:

[0039] 10. First connecting assembly; 11. First connecting cavity; 12. First main body section; 121. Union; 1211. First union; 1212. Second union; 122. Flange joint; 1221. Flange; 1222. Support; 1223. Clamp; 123. Clamp joint; 13. First connecting section; 131. First connecting part; 132. First end face; 133. Connecting pipe section; 134. Positioning protrusion; 1341. Positioning end face; 1342. First positioning inclined surface; 135. Second positioning groove; 136. First positioning step; 137. First disassembly groove;

[0040] 20. second connecting assembly; 21. second communicating cavity; 22. second main body section; 221. second disassembly groove; 23. second connecting section; 231. second connecting portion; 232. mounting groove; 233. second positioning step;

[0041] 30. A first sealing structure;

[0042] 40. Second sealing structure; 41. First retaining ring; 411. Sealing portion; 412. Insertion portion; 42. Second retaining ring; 43. Sealing member; 431. Insertion groove; 432. Annular outer wall surface; 433. Annular inner wall surface; 434. First sealing ring; 435. Second sealing ring;

[0043] 50. Installation space. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] like Figure 1 to Figure 2 As shown, the first embodiment of the utility model provides a connection assembly, which includes a first connection assembly 10 and a second connection assembly 20. The first connection assembly 10 has a first connecting cavity 11, and the first connection assembly 10 includes a first main body section 12 and a first connecting section 13 connected to each other. A first connecting portion 131 is provided on the inner side wall of the first connecting section 13, and an end of the first connecting section 13 away from the first main body section 12 has a first end face 132. The second connection assembly 20 has a second connecting cavity 21, and the second connection assembly 20 includes a second main body section 22 and a second connecting section 23 connected to each other. An end of the second main body section 22 close to the second connecting section 23 has a second end face for abutting against the first end face 132, and a second connecting portion 231 for matching with the first connecting portion 131 is provided on the outer side wall of the second connecting section 23. The first connecting portion 131 is connected and matched with the second connecting portion 231, so that the first connecting cavity 11 and the second connecting cavity 21 are connected. The connecting assembly also includes a first sealing structure 30 and a second sealing structure 40 that are spaced apart. The first sealing structure 30 is disposed between the first end face 132 and the second end face, and the first sealing structure 30 is disposed around the outer edge of the second connecting section 23; the second sealing structure 40 is disposed between the first connecting section 13 and the second connecting section 23, and the second sealing structure 40 is disposed on one side of the connecting point of the first connecting portion 131 and the second connecting portion 231 close to the connecting point of the first connecting cavity 11 and the second connecting cavity 21.

[0046] By using the connection assembly provided in the first embodiment, the first sealing structure 30 can be arranged between the first end face 132 and the second end face, and the second sealing structure 40 can be arranged at the side of the connection between the first connecting part 131 and the second connecting part 231 close to the connection between the first connecting cavity 11 and the second connecting cavity 21, so as to form a double seal between the first connection assembly 10 and the second connection assembly 20, thereby effectively preventing fluid leakage. Therefore, the connection assembly provided in this embodiment can solve the technical problem of poor joint sealing effect in the prior art.

[0047] Specifically, the first sealing structure 30 may be a non-metallic seal or a metal seal, and the second sealing structure 40 may be a non-metallic seal or a metal seal.

[0048] Specifically, at least a portion of one end of the second connecting segment 23 away from the second main body segment 22 is used to abut against at least a portion of the first connecting segment 13, and the first connecting segment 13 and the second connecting segment 23 are sandwiched on the second sealing structure 40. With such a structural arrangement, the sealing contact with the second sealing structure 40 can be strengthened by abutting between the end faces, thereby enhancing the sealing effect.

[0049] Specifically, the second sealing structure 40 is arranged around the connection point of the first connecting cavity 11 and the second connecting cavity 21, and the matching point of the second sealing structure 40 and the first connecting part 131 and the second connecting part 231 is arranged at intervals along the radial direction of the second connecting section 23. With such a structural arrangement, the connecting flow path from the connection point of the first connecting cavity 11 and the second connecting cavity 21 to the matching point of the first connecting part 131 and the second connecting part 231 can be increased, and the sealing effect can be further improved with the second sealing structure 40.

[0050] Specifically, the second connecting section 23 is provided with a mounting groove 232 arranged around the connecting portion of the first connecting cavity 11 and the second connecting cavity 21, the mounting groove 232 is adapted to the shape of the second sealing structure 40, and the second sealing structure 40 is installed in the mounting groove 232. The first connecting section 13 includes a connecting pipe section 133 and a positioning protrusion 134 connected to each other, the first connecting portion 131 is located on the inner wall of the connecting pipe section 133, the positioning protrusion 134 is spaced and arranged opposite to the first connecting portion 131, and the positioning protrusion 134 and the first connecting portion 131 enclose a first positioning groove adapted to the end of the second connecting section 23. The positioning protrusion 134 has a positioning end face 1341 and a first positioning inclined face 1342 connected to each other, the positioning end face 1341 is arranged at the notch of the mounting groove 232, and the positioning end face 1341 is used to abut and position the second sealing structure 40. The second connecting section 23 has a second positioning bevel for abutting and matching with the first positioning bevel 1342 at one end away from the second main section 22, and the second positioning bevel is arranged at the notch of the mounting groove 232. With such a structural arrangement, the sealing effect of the connecting assembly can be improved through the abutment between the positioning end face 1341 and the second sealing structure 40, and the abutment between the first positioning bevel 1342 and the second positioning bevel, and such an arrangement forms a blocking boss between the flow cavity and the connecting portion, further blocking the leakage of the fluid and improving the sealing effect.

[0051] Specifically, the second sealing structure 40 is a sealing ring.

[0052] like Figure 3 to Figure 4As shown, in the second embodiment of the present utility model, the first connecting section 13 is provided with a second positioning groove 135, the second positioning groove 135 is adapted to the end of the second connecting section 23, and one end of the second connecting section 23 close to the first connecting section 13 abuts against the bottom of the second positioning groove 135. The first connecting section 13 is provided with a first positioning step 136, the first positioning step 136 is located at the notch of the second positioning groove 135, and the second connecting section 23 is provided with a second positioning step 233 arranged opposite to the first positioning step 136, and the second positioning step 233 is arranged at intervals from the first positioning step 136 to enclose an installation space 50 adapted to the second sealing structure 40. With such a structural arrangement, the sealing effect of the connecting assembly can be effectively enhanced through the sealing contact between the first positioning step 136 and the second positioning step 233 and the second sealing structure 40.

[0053] Specifically, the installation space 50 and the matching position of the first connection part 131 and the second connection part 231 are arranged at intervals along the axial direction of the first connection section 13. In this way, the fluid flowing toward the matching position of the first connection part 131 and the second connection part 231 along the axial direction of the first connection section 13 can be sealed and blocked by the second sealing structure 40 in the installation space 50, further improving the sealing effect.

[0054] Specifically, the second sealing structure 40 includes a first retaining ring 41 and a second retaining ring 42 arranged at intervals, the first retaining ring 41 has a sealing portion 411 and an inserting portion 412 connected to each other, the sealing portion 411 is sealed against the end surface of the first positioning step 136, the second retaining ring 42 is installed at the end surface of the second positioning step 233, and the second retaining ring 42 is sealed against the end surface of the second positioning step 233. The second sealing structure 40 also includes a sealing member 43, which is arranged between the first retaining ring 41 and the second retaining ring 42, and the sealing member 43 has an inserting groove 431, the inserting groove 431 is arranged toward the inserting portion 412, the inserting portion 412 is inserted in the inserting groove 431, the annular outer wall surface 432 of the sealing member 43 is sealed against the side wall surface of the first positioning step 136, and the annular inner wall surface 433 of the sealing member 43 is sealed against the side wall surface of the second positioning step 233. With such a structural setting, the first retaining ring 41 can form a first layer of barrier for the fluid. When the fluid flows into the insertion groove 431, the fluid pressure squeezes the sealing member 43, so that the annular outer wall surface 432 and the annular inner wall surface 433 are respectively abutted and sealed with the side wall surface of the first positioning step 136 and the side wall surface of the second positioning step 233 under the extrusion effect, thereby playing a sealing role. The second retaining ring 42 abuts against the end surface of the second positioning step 233, which can provide sufficient support force for the second sealing structure 40.

[0055] Specifically, the sealing member 43 includes a first sealing ring 434 and a second sealing ring 435 that abut against each other, the first sealing ring 434 has an insertion protrusion at one end away from the insertion groove 431, one end of the second sealing ring 435 abuts against and seals with the second retaining ring 42, and the insertion protrusion is inserted on the other end of the second sealing ring 435. With such a structural arrangement, when the fluid flows into the insertion groove 431, the fluid pressure first squeezes the first sealing ring 434, and the insertion protrusion further squeezes the second sealing ring 435, so that the annular outer wall surface 432 and the annular inner wall surface 433 are respectively abutted against and sealed with the side wall surface of the first positioning step 136 and the side wall surface of the second positioning step 233 under the extrusion effect, and the sealing effect is effectively played.

[0056] In order to provide sufficient supporting force, the second retaining ring 42 is made of a high-hardness plastic material.

[0057] Specifically, the second sealing structure 40 is a Variseal sealing structure.

[0058] Specifically, the first connection portion 131 is an internal thread, and the second connection portion 231 is an external thread. A first disassembly groove 137 is provided on the outer wall surface of the first connection section 13, and the first disassembly groove 137 is adapted to the shape of the first disassembly rod. In this way, the on-site disassembly operation can be conveniently completed through the cooperation of the first disassembly rod and the first disassembly groove 137.

[0059] Specifically, a second disassembly groove 221 is provided on one side of the second main body section 22 close to the second connecting section 23. The second disassembly groove 221 is located on the outer wall surface of the second main body section 22, and the second disassembly groove 221 is adapted to the shape of the second disassembly rod. In this way, the on-site disassembly operation can be conveniently completed through the cooperation of the second disassembly rod and the second disassembly groove 221.

[0060] Specifically, the first connection portion 131 is an internal thread, the second connection portion 231 is an external thread, and a second disassembly groove 221 is provided on one side of the second main body section 22 close to the second connection section 23, and the second disassembly groove 221 is adapted to the shape of the second disassembly rod. There are multiple second disassembly grooves 221, and the multiple second disassembly grooves 221 are arranged at intervals along the circumference of the second main body section 22. In this way, it is convenient to select the second disassembly groove 221 according to the needs of actual operation, and the disassembly efficiency is effectively improved.

[0061] like Figures 1 to 11As shown, in the first, second, third, fourth and fifth embodiments of the present invention, the first main body section 12 is a union 121 or a flange joint 122 or a clamp joint 123 or a rotary flange joint. The union 121 includes a first union 1211 and a second union 1212, the first union 1211 is a male union, and the second union 1212 is a female union. With such a structural setting, there is no need to replace the entire set of pipelines, and there is no need to set up a conversion joint. The type of joint can be quickly changed according to the actual on-site application requirements, thereby improving the work efficiency.

[0062] like Figure 1 , Figure 5 As shown, the flange joint 122 includes a flange 1221, a support portion 1222 and a collar 1223. The flange 1221 is sleeved on one end of the first main section 12 away from the first connecting section 13. The flange 1221 is spaced apart from the outer circumference of the first main section 12. The support portion 1222 is located at the gap between the flange 1221 and the first main section 12. The support portion 1222 includes at least two support portions, and the at least two support portions are evenly arranged on the outer circumference of the first main section 12 along the circumference of the first main section 12. The collar 1223 is arranged on one side of the support portion 1222 away from the flange 1221. The collar 1223 is used to fix the at least two support portions on the first main section 12. The flange 1221 is rotatably arranged relative to the support portion 1222. In this way, during the use of the connection assembly, the flange 1221 can be rotated more flexibly according to the on-site joint conditions to improve the docking efficiency.

[0063] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: the multi-component quick connection structure can realize the rapid replacement of different end connection requirements without replacing the pipe body; realize the pressure-bearing integrity, safety and convenience of high-pressure fluid transportation; through threaded tightening and locking, the connection method is simplified, and the tightening method does not require additional configuration of hydraulic wrenches or electric wrenches, and quick tightening can be achieved by rotating the mounting hole designed with an outer diameter; different groove structures can be designed to meet the needs of oil and gas field operations.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0066] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0067] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0068] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0069] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A connection assembly, characterized in that: include: A first connecting assembly (10), the first connecting assembly (10) having a first connecting cavity (11), the first connecting assembly (10) comprising a first main body section (12) and a first connecting section (13) connected to each other, a first connecting portion (131) being arranged on an inner side wall of the first connecting section (13), and an end of the first connecting section (13) away from the first main body section (12) having a first end surface (132); A second connecting component (20), the second connecting component (20) having a second connecting cavity (21), the second connecting component (20) comprising a second main body section (22) and a second connecting section (23) connected to each other, the second main body section (22) having a second end surface for abutting against the first end surface (132) at one end close to the second connecting section (23), a second connecting portion (231) for matching with the first connecting portion (131) being arranged on an outer side wall of the second connecting section (23), the first connecting portion (131) being connected and matched with the second connecting portion (231) so that the first connecting cavity (11) and the second connecting cavity (21) are connected; A first sealing structure (30) and a second sealing structure (40) are arranged at intervals, wherein the first sealing structure (30) is arranged between the first end face (132) and the second end face, and the first sealing structure (30) is arranged around the outer edge of the second connecting section (23); the second sealing structure (40) is arranged between the first connecting section (13) and the second connecting section (23), and the second sealing structure (40) is arranged on one side of the matching part of the first connecting portion (131) and the second connecting portion (231) close to the connecting part of the first connecting cavity (11) and the second connecting cavity (21).

2. The connection assembly according to claim 1, characterized in that: At least a portion of one end of the second connecting section (23) away from the second main section (22) is used to abut against at least a portion of the first connecting section (13), and the first connecting section (13) and the second connecting section (23) are clamped on the second sealing structure (40).

3. The connection assembly according to claim 2, characterized in that: The second sealing structure (40) is arranged around the connecting point between the first connecting cavity (11) and the second connecting cavity (21), and the matching points between the second sealing structure (40) and the first connecting portion (131) and the second connecting portion (231) are arranged at intervals along the radial direction of the second connecting section (23).

4. The connection assembly according to claim 3, characterized in that: The second connecting section (23) is provided with a mounting groove (232) arranged around the connecting point between the first connecting cavity (11) and the second connecting cavity (21), the mounting groove (232) being adapted to the shape of the second sealing structure (40), and the second sealing structure (40) being installed in the mounting groove (232); The first connecting section (13) comprises a connecting pipe section (133) and a positioning protrusion (134) which are connected to each other. The first connecting portion (131) is located on the inner wall of the connecting pipe section (133). The positioning protrusion (134) is spaced apart from and arranged opposite to the first connecting portion (131). The positioning protrusion (134) and the first connecting portion (131) form a first positioning groove which is adapted to the end of the second connecting section (23). The positioning protrusion (134) has mutually connected positioning protrusions. An end face (1341) and a first positioning inclined surface (1342), wherein the positioning end face (1341) is arranged at the notch of the mounting groove (232), and the positioning end face (1341) is used to abut and position the second sealing structure (40); an end of the second connecting section (23) away from the second main section (22) has a second positioning inclined surface for abutting and matching with the first positioning inclined surface (1342), and the second positioning inclined surface is arranged at the notch of the mounting groove (232).

5. The connection assembly according to claim 2, characterized in that: The first connecting section (13) is provided with a second positioning groove (135), the second positioning groove (135) is adapted to the end of the second connecting section (23), and one end of the second connecting section (23) close to the first connecting section (13) abuts against the bottom of the second positioning groove (135); The first connecting section (13) is provided with a first positioning step (136), the first positioning step (136) is located at the notch of the second positioning groove (135), the second connecting section (23) is provided with a second positioning step (233) arranged opposite to the first positioning step (136), the second positioning step (233) is spaced apart from the first positioning step (136) to enclose an installation space (50) adapted to the second sealing structure (40).

6. The connection assembly according to claim 5, characterized in that: The installation space (50) and the matching locations of the first connecting portion (131) and the second connecting portion (231) are arranged at intervals along the axial direction of the first connecting section (13).

7. The connection assembly according to claim 6, characterized in that: The second sealing structure (40) comprises: A first retaining ring (41) and a second retaining ring (42) are arranged at intervals, the first retaining ring (41) having a sealing portion (411) and an inserting portion (412) connected to each other, the sealing portion (411) abutting and sealing against an end surface of the first positioning step (136), the second retaining ring (42) being installed at an end surface of the second positioning step (233), the second retaining ring (42) abutting and sealing against an end surface of the second positioning step (233); A sealing member (43) is arranged between the first retaining ring (41) and the second retaining ring (42), and the sealing member (43) has an insertion groove (431), the insertion groove (431) is arranged toward the insertion portion (412), and the insertion portion (412) is inserted into the insertion groove (431), the annular outer wall surface (432) of the sealing member (43) is abutted and sealed with the side wall surface of the first positioning step (136), and the annular inner wall surface (433) of the sealing member (43) is abutted and sealed with the side wall surface of the second positioning step (233).

8. The connection assembly according to claim 1, characterized in that: The first connection portion (131) is an internal thread, and the second connection portion (231) is an external thread; Wherein, a first disassembly groove (137) is provided on the outer wall surface of the first connecting section (13), and the first disassembly groove (137) is adapted to the shape of the first disassembly rod; and / or, A second disassembly groove (221) is provided on one side of the second main body section (22) close to the second connecting section (23). The second disassembly groove (221) is located on the outer wall surface of the second main body section (22). The second disassembly groove (221) is adapted to the shape of the second disassembly rod.

9. The connection assembly according to claim 1, characterized in that: The first connecting portion (131) is an internal thread, the second connecting portion (231) is an external thread, and a second disassembly groove (221) is provided on one side of the second main body section (22) close to the second connecting section (23), and the second disassembly groove (221) is adapted to the shape of the second disassembly rod; There are a plurality of second disassembly grooves (221), and the plurality of second disassembly grooves (221) are arranged at intervals along the circumference of the second main body section (22).

10. The connection assembly according to any one of claims 1 to 9, characterized in that: The first main body section (12) is a union joint (121) or a flange joint (122) or a clamp joint (123) or a swivel flange joint.

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