Pipeline connecting structure
By designing sealing grooves and setting limiting structures at the embedded ends of pipe fittings and connecting pipes, the processing difficulties and high costs of welded connections are solved, achieving convenient installation and reduced processing costs.
Patent Information
- Application Number
- CN202520406595.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-03-10
AI Technical Summary
In existing technologies, the connection between pipe fittings and connecting pipes is mainly achieved through welding, which presents problems such as difficult processing and high cost.
The design incorporates an embedded end for the pipe fitting and connecting pipe. By forming a sealing groove and installing a sealing element at the connection end, the sealing element is positioned using a limiting structure, and a sealing structure is formed by bending. This allows the pipe fitting, connecting pipe, and sealing element to form an integrated structure, avoiding welding.
It enables convenient installation of pipe connections, reduces processing costs, and eliminates the need for subsequent surface treatment.
Smart Images
Figure CN223595314U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to pipe fitting technical field especially relates to a pipeline connecting structure. BACKGROUND
[0002] With the development of science and technology, wall-hanging stove or water heater popularizes to people's daily life, brings the convenience to people's life. Among them, pipeline connection is the core component part of wall-hanging stove or water heater system, and its technical development is directly related to the safety, energy efficiency and service life of equipment.
[0003] The pipeline of wall-hanging stove or water heater is usually metal piece, for example, red copper pipe, which is connected with pipe joint by welding mode, and surface treatment is needed to remove surface dirt after welding. The pipeline can also be stainless steel, which is connected with pipe joint by welding mode, and this connection mode has the problems of difficult processing and high cost. SUMMARY
[0004] The utility model discloses a pipeline connecting structure, solve the technical problem of subsequent surface treatment step or difficult processing and high cost in the prior art by welding mode to realize the connection of pipe joint and connecting pipe.
[0005] To achieve this purpose, the utility model adopts the following technical scheme:
[0006] The utility model provides a pipeline connecting structure, including pipe joint and connecting pipe, the pipe joint is provided with the hole, one end of pipe joint is the connecting end, one end of connecting pipe is the embedded end, the embedded end is installed in the hole from the connecting end, the connecting end and the embedded end form the sealed groove around the connecting pipe, and the sealed groove is provided with sealing element.
[0007] The end face of the connecting end can be bent inward along the circumference of the hole to form a sealing structure, and the sealing structure is bent to form an open structure before the bending. The embedded end is provided with a limiting structure in the circumferential direction, which can extend into the open structure and abut against the end face of the connecting end and / or be limited in the sealed groove. After the embedded end is installed in the hole, the open structure is bent to form the sealing structure by a processing technology.
[0008] The pipeline connecting structure comprises a pipe joint and a connecting pipe, the embedded end of the connecting pipe is installed in the through hole of the pipe joint, a sealing groove is formed between the connecting end and the embedded end, and a sealing element in the sealing groove seals the gap between the pipe joint and the connecting pipe; the end face of the connecting end is bent inward along the circumference of the through hole to form a sealing structure, the sealing structure is an open structure before being bent, and a limiting structure is protruded on the circumference of the embedded end, the limiting structure can abut against the end face of the connecting end and / or be limited in the sealing groove to position the connecting pipe; after the embedded end is installed in the through hole, the open structure is bent to form the sealing structure through a machining process, so that the pipe joint, the connecting pipe and the sealing element form an integrated structure, the pipeline connecting structure is convenient to install, the machining cost is reduced, and subsequent surface treatment is not required.
[0009] As a preferred scheme of the pipeline connecting structure, an inner wall of the through hole is provided with the sealing groove, the sealing groove penetrates the end face of the connecting end, a circumferential side wall of the sealing groove and the end face of the connecting end form a stepped structure, the sealing element is arranged in the sealing groove, the limiting structure abuts against the end face of the connecting end, and the sealing structure wraps an outer circumference of the limiting structure.
[0010] The sealing element is arranged in the sealing groove, the limiting structure prevents the sealing element from coming out of the sealing groove, the limiting structure abuts against the end face of the connecting end, and the connecting pipe is positioned, so that the pipeline connecting structure is simple in structure and convenient to manufacture.
[0011] As a preferred scheme of the pipeline connecting structure, the limiting structure and the sealing element are annular structures, and an outer diameter of the limiting structure is greater than a diameter of the sealing groove.
[0012] The outer diameter of the limiting structure is greater than the diameter of the sealing groove, and the limiting structure can abut against the end face of the connecting end.
[0013] As a preferred scheme of the pipeline connecting structure, an inner wall of the through hole is provided with the sealing groove, the sealing groove penetrates the end face of the connecting end along the axial direction of the through hole, the embedded end is provided with at least two limiting structures along the axial direction of the embedded end, the sealing element is limited between two adjacent limiting structures, the limiting structure and the sealing element are installed in the sealing groove, the limiting structure close to the end face of the embedded end abuts against the groove wall of the sealing groove, and the sealing structure wraps the limiting structure away from the end face of the embedded end.
[0014] The limiting structure limits the sealing element to prevent the sealing element from moving at will, the limiting structure close to the end face of the embedded end abuts against the groove wall of the sealing groove to position the connecting pipe, and the sealing structure wraps the limiting structure away from the end face of the embedded end to seal the limiting structure.
[0015] As a preferred scheme of the pipeline connection structure, the sizes of the limiting structures are the same.
[0016] The sizes of the limiting structures are the same, the structure is simple, and the limiting structures are easy to manufacture.
[0017] As a preferred scheme of the pipeline connection structure, the inner wall of the through hole is provided with the sealing groove, and the circumferential side wall of the sealing groove and the end face of the connecting end form a stepped structure.
[0018] The limiting structure comprises a first limiting piece and at least one second limiting piece, the first limiting piece is located on the side of each second limiting piece away from the end face of the embedding end, the sealing piece is arranged between two adjacent second limiting pieces and / or between the first limiting piece and the second limiting piece adjacent to the first limiting piece, the second limiting piece and the sealing piece are installed in the sealing groove, the first limiting piece abuts against the end face of the connecting end, and the sealing structure wraps the outer periphery of the first limiting piece.
[0019] The first limiting piece and the second limiting piece can limit the sealing piece to prevent the sealing piece from moving randomly.
[0020] As a preferred scheme of the pipeline connection structure, the sizes of the second limiting pieces are the same, and the diameter of the first limiting piece is greater than the diameter of the sealing groove.
[0021] The sizes of the second limiting pieces are the same, the structure is simple, and the second limiting pieces are easy to manufacture; and the diameter of the first limiting piece is greater than the diameter of the sealing groove, so that the first limiting piece can abut against the end face of the connecting end.
[0022] As a preferred scheme of the pipeline connection structure, the slot opening of the sealing groove is arranged towards the axis of the connecting end, the sealing piece is arranged in the sealing groove, the limiting structure abuts against the end face of the connecting end, and the sealing structure wraps the outer periphery of the limiting structure.
[0023] The sealing groove is used for accommodating the sealing piece, the limiting structure abuts against the end face of the connecting end, and the sealing structure wraps the outer periphery of the limiting structure, so that the structure is simple.
[0024] As a preferred scheme of the pipeline connection structure, the thickness dimension of the open structure gradually decreases from one end connected with the end face of the connecting end to the other end.
[0025] The thickness dimension of the open structure gradually decreases from one end connected with the end face of the connecting end to the other end, so that the open structure can be bent to form the sealing structure.
[0026] As a preferred scheme of the above pipeline connection structure, the limiting structure is a bump wave formed on the connecting pipe.
[0027] The limiting structure is a bump wave formed on the connecting pipe, and the structure is simple and easy to manufacture.
[0028] The pipeline connection structure has the advantages that:
[0029] The pipeline connection structure has the advantages that: BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 is a first structure schematic view of the pipeline connection structure provided by the utility model embodiment one;
[0031] Figure 2 is a second structure schematic view of the pipeline connection structure provided by the utility model embodiment one;
[0032] Figure 3 is Figure 2 is a sectional view along line A-A in the figure;
[0033] Figure 4 is a structure schematic view of the pipeline connection structure provided by the utility model embodiment one when the sealing structure is not bent;
[0034] Figure 5 is a sectional view of the pipeline connection structure provided by the utility model embodiment two;
[0035] Figure 6 is a sectional view of the pipeline connection structure provided by the utility model embodiment three;
[0036] Figure 7 is a sectional view of the pipeline connection structure provided by the utility model embodiment four.
[0037] In the figure:
[0038] 1, pipe joint; 11, through hole; 12, connecting end; 120, connecting end face; 13, sealing groove; 14, sealing structure;
[0039] 2, connecting pipe; 21, embedded end; 22, limiting structure; 221, first limiting piece; 222, second limiting piece;
[0040] 3, sealing element. DETAILED DESCRIPTION
[0041] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.
[0042] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0043] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0044] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.
[0045] Example one:
[0046] As Figures 1-4As shown, the embodiment provides a pipeline connection structure, which comprises a pipe joint 1 and a connecting pipe 2. The pipe joint 1 is provided with a through hole 11. One end of the pipe joint 1 is a connecting end 12. One end of the connecting pipe 2 is an embedded end 21. The embedded end 21 is installed in the through hole 11 from the connecting end 12. A sealing groove 13 surrounding the connecting pipe 2 is formed between the connecting end 12 and the embedded end 21. A sealing element 3 is arranged in the sealing groove 13. The sealing element 3 plays a sealing role on the gap between the pipe joint 1 and the connecting pipe 2. The end face of the connecting end 12 is a connecting end face 120. The connecting end face 120 can be bent inward along the circumference of the through hole 11 to form a sealing structure 14. The sealing structure 14 is an open structure before being bent (see Figure 4 ). The embedded end 21 is provided with a limiting structure 22 in the circumferential direction. The limiting structure 22 can extend into the open structure and abut against the end face of the connecting end 12 and / or be limited in the sealing groove 13. After the embedded end 21 is installed in the through hole 11, the open structure is bent by a machining process to form the sealing structure 14, so that the pipe joint 1, the connecting pipe 2 and the sealing element 3 form an integrated structure. The pipeline connection structure is convenient to install and does not need to be welded, which reduces the processing cost and does not need subsequent surface treatment.
[0047] The above pipeline connection structure is applied to the pipeline connection of a wall-hanging stove or a water heater. Of course, it can also be applied to the pipeline connection of other devices.
[0048] In the embodiment, the inner wall of the through hole 11 is provided with the sealing groove 13. The sealing groove 13 penetrates the end face of the connecting end 12 along the axial direction of the through hole 11, that is, penetrates the connecting end face 120. The circumferential side wall of the sealing groove 13 and the end face of the connecting end 12 form a stepped structure. The sealing element 3 is arranged in the sealing groove 13. The limiting structure 22 abuts against the end face of the connecting end 12. The sealing structure 14 wraps the outer periphery of the limiting structure 22. The sealing element 3 is arranged in the sealing groove 13. The limiting structure 22 prevents the sealing element 3 from coming out of the sealing groove 13. The limiting structure 22 abuts against the end face of the connecting end 12, which can position the connecting pipe 2. The pipeline connection structure is simple in structure and convenient to prepare.
[0049] In the embodiment, the limiting structure 22 and the sealing element 3 are annular structures. The outer diameter of the sealing element 3 is smaller than the diameter of the sealing groove 13. The outer diameter of the limiting structure 22 is greater than the diameter of the sealing element 3, so that the sealing element 3 can be installed in the sealing groove 13 and the limiting structure 22 can abut against the end face of the connecting end 12. In other embodiments, the outer diameter of the sealing element 3 can be greater than the diameter of the sealing groove 13, so that the sealing element 3 and the sealing groove 13 form an interference fit, which enhances the sealing effect of the sealing element 3. Of course, the outer diameter of the sealing element 3 can also be equal to the diameter of the sealing groove 13.
[0050] Optionally, the sealing structure 14 is arranged around the whole circumference of the sealing groove 13, and can wrap the whole limiting structure 22, so as to better seal the limiting structure 22. The thickness of the open structure gradually decreases from one end connected with the end surface of the connecting end 12 to the other end, so as to facilitate the bending of the open structure to form the sealing structure 14. In the embodiment, the inner surface of the open structure has the same size, which facilitates the installation of the connecting pipe 2.
[0051] Optionally, the limiting structure 22 is formed on the connecting pipe 2 in the form of a bump, and the limiting structure 22 has a simple structure and is easy to manufacture.
[0052] In the embodiment, the connecting pipe 2 is a metal pipe, which can be a copper pipe or a stainless steel pipe. The pipe joint 1 is also made of metal. In other embodiments, the connecting pipe 2 is not limited to a copper pipe or a stainless steel pipe, but can also be other metal pipes.
[0053] When the pipe joint 1 and the connecting pipe 2 are connected, the sealing member 3 is first assembled to the connecting pipe 2 at the side of the end surface of the limiting structure 22 close to the embedded end 21, then the assembled pipe is inserted into the through hole 11 of the pipe joint 1, the sealing member 3 is installed in the sealing groove 13, the limiting structure 22 abuts against the end surface (connecting end surface 120) of the connecting end 12 of the pipe joint 1, that is, it is installed in place, and finally the open structure is bent to form the sealing structure 14, so that the sealing structure 14 wraps the outer periphery of the limiting structure 22, so that the pipe joint 1, the sealing member 3 and the connecting pipe 2 become an integral whole, and the connection of the pipe joint 1 and the connecting pipe 2 is completed.
[0054] Optionally, the processing technology of bending the open structure to form the sealing structure 14 can be plastic forming processing, pressure processing, etc., such as hot rolling, cold rolling, stamping, pressing, forging, etc. Of course, the bending of the open structure is not limited to the above-mentioned processing methods, as long as the open structure can be bent to form the sealing structure 14.
[0055] Embodiment two:
[0056] The embodiment provides a pipe connecting structure, and the difference between the embodiment and the embodiment one is that the structure of the sealing groove 13 and the number of the limiting structure 22 are different, as shown in Figure 5As shown, in this embodiment, a sealing groove 13 is provided on the inner wall of the through hole 11. The sealing groove 13 passes through the end face of the connecting end 12 along the axial direction of the through hole 11, that is, through the connecting end face 120. The embedded end 21 is provided with at least two limiting structures 22 along its axial direction. Each limiting structure 22 is spaced apart along the axial direction of the embedded end 21. The sealing member 3 is limited between two adjacent limiting structures 22. Both the limiting structure 22 and the sealing member 3 are installed in the sealing groove 13. The limiting structure 22 located near the end face of the embedded end 21 abuts against the groove wall of the sealing groove 13. The sealing structure 14 wraps the limiting structure 22 of the embedded end 21 away from its end face.
[0057] The sealing element 3 is limited by the limiting structure 22 to prevent it from moving at will. The limiting structure 22 located near the end face of the embedded end 21 abuts against the groove wall of the sealing groove 13 to play a role in the installation and positioning of the connecting pipe 2. The sealing structure 14 wraps the limiting structure 22 away from the end face of the embedded end 21, thereby sealing the limiting structure 22.
[0058] In this embodiment, the embedded end 21 is provided with two limiting structures 22 along its axial direction, and the two limiting structures 22 are spaced apart along the axial direction of the embedded end 21. A sealing element 3 is provided between the two limiting structures 22. In other embodiments, the number of limiting structures 22 is not limited to two, but can also be three, four or more. A sealing element 3 can be provided between two adjacent limiting structures 22 to enhance the sealing effect, or a sealing element 3 can be provided between some adjacent limiting structures 22.
[0059] In this embodiment, the inner surface of the sealing structure 14 is flush with the circumferential sidewall of the sealing groove 13, and the structure is relatively simple and easy to prepare.
[0060] In this embodiment, all limiting structures 22 have the same size, are simple in structure, and are easy to manufacture.
[0061] When connecting pipe joint 1 and connecting pipe 2, first assemble the sealing element 3 between the two limiting structures 22, and then insert the assembled pipe into the through hole 11 of pipe joint 1. Both the limiting structure 22 and the sealing element 3 extend into the through hole 11, with the limiting structure 22 (close to the end face of the embedded end 21) being the first to be inserted. Figure 5 When the left-side limiting structure 22 abuts against the wall of the sealing groove 13, it is installed in place. Finally, the open structure is bent to form the sealing structure 14, so that the sealing structure 14 covers the limiting structure 22 located at the embedded end 21 away from its end face. Figure 5 The outer periphery of the right-side limiting structure 22) is used to integrate the pipe joint 1, the seal 3, and the connecting pipe 2, thereby completing the connection between the pipe joint 1 and the connecting pipe 2.
[0062] Example 3:
[0063] The difference between the embodiment and the first embodiment is that the number of the limiting structures 22 is different, as shown in the drawings. Figure 6 In the embodiment, the inner wall of the through hole 11 is provided with a sealing groove 13, and the circumferential side wall of the sealing groove 13 and the end face of the connecting end 12 form a stepped structure; the limiting structure 22 includes a first limiting piece 221 and at least one second limiting piece 222, the first limiting piece 221 is located on the side of each second limiting piece 222 away from the end face of the embedding end 21, the sealing piece 3 is arranged between the adjacent two second limiting pieces 222 and / or between the first limiting piece 221 and the second limiting piece 222 adjacent thereto, the second limiting piece 222 and the sealing piece 3 are both installed in the sealing groove 13, the first limiting piece 221 abuts against the end face of the connecting end 12, and the sealing structure 14 wraps the outer periphery of the first limiting piece 221.
[0064] The first limiting piece 221 and the second limiting piece 222 can limit the sealing piece 3 to prevent the sealing piece 3 from moving randomly; the first limiting piece 221 abuts against the end face of the connecting end 12 to serve as a positioning function for the installation of the connecting pipe 2.
[0065] Alternatively, the sizes of the second limiting pieces 222 are the same, and the diameter of the first limiting piece 221 is greater than the diameter of the sealing groove 13. The sizes of the second limiting pieces 222 are the same, and the structure is simple and easy to manufacture; the diameter of the first limiting piece 221 is greater than the diameter of the sealing groove 13, so as to abut against the end face of the connecting end 12.
[0066] In the embodiment, as shown in the drawings, one second limiting piece 222 is arranged, and the sealing piece 3 is arranged between the first limiting piece 221 and the second limiting piece 222, the first limiting piece 221 can abut against the end face of the connecting end 12, and the second limiting piece 222 extends into the sealing groove 13 and can also abut against the groove wall of the sealing groove 13. Figure 6
[0067] When the pipe joint 1 and the connecting pipe 2 are connected, the sealing piece 3 is first assembled between the first limiting piece 221 and the second limiting piece 222, then the assembled pipeline is inserted into the through hole 11 of the pipe joint 1, the second limiting piece 222 and the sealing piece 3 both extend into the through hole 11, the first limiting piece 221 is installed in place when abutting against the end face of the connecting end 12, and finally the open structure is bent to form the sealing structure 14, so that the sealing structure 14 wraps the outer periphery of the first limiting piece 221, thereby integrating the pipe joint 1, the sealing piece 3, and the connecting pipe 2, and completing the connection of the pipe joint 1 and the connecting pipe 2.
[0068] Embodiment Four:
[0069] The embodiment provides a pipeline connecting structure, and the difference between the embodiment and the first embodiment is that the structure of the sealing groove 13 is different. Figure 7 As shown in the figure, in the embodiment, the slot of the sealing groove 13 is arranged towards the axis of the connecting end 12, the sealing member 3 is arranged in the sealing groove 13, the limiting structure 22 abuts against the end face of the connecting end 12, and the sealing structure 14 wraps the outer periphery of the limiting structure 22, so that the structure is relatively simple.
[0070] When the pipe joint 1 and the connecting pipe 2 are connected, the sealing member 3 is first assembled into the sealing groove 13, then the connecting pipe 2 is inserted into the through hole 11 of the pipe joint 1, the limiting structure 22 is installed in place when abutting against the end face of the connecting end 12, finally the open structure is bent to form the sealing structure 14, so that the sealing structure 14 wraps the outer periphery of the limiting structure 22, so that the pipe joint 1, the sealing member 3 and the connecting pipe 2 become an integrated whole, and the connection of the pipe joint 1 and the connecting pipe 2 is completed.
[0071] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not to be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.
Claims
1. A pipe connection structure, characterized by The utility model provides a pipe joint (1) and connecting pipe (2) are included, the pipe joint (1) is provided with the through hole (11), one end of pipe joint (1) is the connecting end (12), one end of connecting pipe (2) is the embedded end (21), the embedded end (21) is installed in the through hole (11) from the connecting end (12), the connecting end (12) and the embedded end (21) between form the sealed groove (13) around connecting pipe (2), the sealed groove (13) is provided with sealing element (3); The end face of the connecting end (12) can be bent inward along the circumference of the through hole (11) to form a sealing structure (14), and the sealing structure (14) is bent to form an open structure before bending; the embedded end (21) is circumferentially provided with a limiting structure (22), which can extend into the open structure and abut against the end face of the connecting end (12) and / or be limited in the sealed groove (13); after the embedded end (21) is installed in the through hole (11), the open structure is bent by a machining process to form the sealing structure (14).
2. The pipe connection structure according to claim 1, characterized by The inner wall of the through hole (11) is provided with the sealed groove (13), the sealed groove (13) penetrates the end face of the connecting end (12), the circumferential side wall of the sealed groove (13) and the end face of the connecting end (12) form a stepped structure, the sealing element (3) is arranged in the sealed groove (13), the limiting structure (22) abuts against the end face of the connecting end (12), and the sealing structure (14) wraps the outer periphery of the limiting structure (22).
3. The pipe connection structure according to claim 2, characterized by The limiting structure (22) and the sealing element (3) are both annular structures, and the outer diameter of the limiting structure (22) is greater than the diameter of the sealed groove (13).
4. The pipe connection structure according to claim 1, characterized by The inner wall of the through hole (11) is provided with the sealed groove (13), the sealed groove (13) penetrates the end face of the connecting end (12) along the axial direction of the through hole (11), the embedded end (21) is provided with at least two limiting structures (22) along the axial direction thereof, the sealing element (3) is limited between two adjacent limiting structures (22), the limiting structure (22) and the sealing element (3) are both installed in the sealed groove (13), the limiting structure (22) close to the end face of the embedded end (21) abuts against the groove wall of the sealed groove (13), and the sealing structure (14) wraps the limiting structure (22) away from the end face of the embedded end (21).
5. The pipe connection structure according to claim 4, characterized by The limiting structures (22) are of the same size.
6. The pipe connection structure according to claim 1, characterized by The inner wall of the through hole (11) is provided with the sealed groove (13), and the circumferential side wall of the sealed groove (13) and the end face of the connecting end (12) form a stepped structure; The limiting structure (22) comprises a first limiting piece (221) and at least one second limiting piece (222), the first limiting piece (221) is located on the side of each second limiting piece (222) away from the end face of the embedding end (21), the sealing piece (3) is arranged between two adjacent second limiting pieces (222) and / or between the first limiting piece (221) and the second limiting piece (222) adjacent thereto, the second limiting piece (222) and the sealing piece (3) are both mounted in the sealing groove (13), the first limiting piece (221) abuts with the end face of the connecting end (12), and the sealing structure (14) wraps the outer periphery of the first limiting piece (221).
7. The pipe connection structure according to claim 6, characterized by The sizes of each second limiting piece (222) are the same, and the diameter of the first limiting piece (221) is greater than the diameter of the sealing groove (13).
8. The pipe connection structure according to claim 1, characterized by The slot opening of the sealing groove (13) is arranged towards the axis of the connecting end (12), the sealing piece (3) is arranged in the sealing groove (13), the limiting structure (22) abuts with the end face of the connecting end (12), and the sealing structure (14) wraps the outer periphery of the limiting structure (22).
9. The pipe connection structure according to any one of claims 1 to 8, characterized by The thickness dimension of the open structure gradually decreases from one end connected with the end face of the connecting end (12) to the other end.
10. The pipe connection structure according to any one of claims 1 to 8, characterized by The limiting structure (22) is a boss wave formed on the connecting pipe (2).