Self-sealing pipeline connecting device

Abstract

The utility model relates to a self-sealing pipeline connecting device which comprises a pipe fitting, a plurality of communicated pipeline connectors are arranged on the pipe fitting, pipelines are inserted into the pipeline connectors, installation grooves are formed in the inner walls of the pipeline connectors or the outer walls of the pipelines in the circumferential direction, sealing rings are arranged in the installation grooves, and the sealing rings are arranged between the pipeline connectors and the pipelines for sealing. After liquid is introduced into the pipeline, the liquid acts on the sealing ring, a structure matched with the liquid to increase the extrusion force of the sealing ring is arranged on the corresponding installation groove and / or the sealing ring, a locking mechanism convenient to disassemble and assemble is arranged between the pipeline connector and the pipeline, and the locking mechanism locks the pipeline connector and the pipeline. Liquid introduced into a pipeline is innovatively used as a key part of a sealing structure, sealing and locking structure design is carried out on the basis, the sealing structure has the advantages of being simple and reasonable in structural design, low in cost, convenient to disassemble and assemble, good in sealing effect, reliable in locking and the like, and the pipeline construction efficiency and quality can be improved easily.

Description

Technical field:

[0001] The utility model relates to the technical field of pipeline connection, in particular to a self-sealing pipeline connection device. Background technology:

[0002] Pipeline connection is inevitable during pipeline laying. Pipeline connection usually requires the help of pipe fittings, which are commonly known as two-way pipe fittings, three-way pipe fittings, etc. The core technology of pipe fittings and pipe connection is sealing and locking. In the past, threaded connection was mainly used, and sealing was performed with sealing rings. This connection method has the advantages of reliable connection and good sealing effect, but there are also many unfavorable factors, such as relatively cumbersome disassembly and assembly, especially when the pipeline is damaged and needs to be replaced in the later stage, it is necessary to disassemble multiple related pipelines to complete the replacement. For example, due to the use of threaded connection, the construction must be carried out in sequence, and it is impossible to flexibly construct according to the actual environment, which seriously affects the construction efficiency.

[0003] In order to further improve and perfect the pipeline connection, various attempts have been made in the prior art, such as using compression fittings to connect pipelines. Compression fittings are a kind of connector that uses a socket pipe fitting with a special sealing ring to connect the pipeline, and uses a special tool to compress the pipe mouth to seal and fix it. The use of the above structure for pipeline connection has the advantages of simple and quick installation, and is mainly suitable for small diameter pipeline connection. However, compression fittings also have the disadvantage that they cannot be reused. When the pipeline needs to be replaced, the compression fittings can only be destroyed and reinstalled with new compression fittings. For another example, a new pipe connection structure has appeared in the market, which uses pipe fittings and locking nuts for pipe connection. For sealing, a sealing ring needs to be set between the pipe fitting and the pipe. One end of the locking nut is installed on the pipe fitting through a threaded connection, and then the other end is connected to the pipe through a designed limiting structure. The limitation here refers to the axial limitation of the pipe. The limiting structure usually includes an installation groove designed in the locking nut, and a limiting groove designed on the outer wall of the pipe. The limiting component is usually installed in the limiting groove. When the pipe is inserted into the pipe fitting, the limiting component is limited by the installation groove and the limiting groove to prevent the pipe from detaching from the locking nut. The limiting structure and the shape of the sealing ring can be improved and designed accordingly according to actual needs. The specific structural form is a small-diameter fire-fighting pipe quick connector disclosed in a Chinese patent (authorization announcement number CN203703421U, its structure is as follows Fig.16 As shown), another example is the pipeline connection structure disclosed in a Chinese patent (authorization announcement number: CN213018181U, its structure is as follows Fig.17 As shown), another example is the pipeline quick connection structure disclosed in the Chinese patent (authorization announcement number: CN213776685U, its structure is as follows Fig.18As shown in the figure, these technical solutions all have corresponding designs for the limit structure, and can basically achieve locking and sealing. The application of the above structure has promoted the development of pipeline connection technology and has certain positive effects. It is relatively easy to disassemble and assemble, flexible in construction, and has good sealing and locking effects.

[0004] However, the above-mentioned improvement scheme has also been found to have room for further improvement in actual application. For example, although the pipeline is no longer directly connected by threads, a locking nut is added, and the locking nut still needs to be threadedly connected to the pipe fitting, which undoubtedly limits the further improvement of construction efficiency, and the parts need to be threaded. For another example, the existing limiting structure basically adopts the structural form of grooves and limiting components. Not only do the locking nut and the pipeline need to be grooved respectively, but in order to facilitate the installation of the limiting component, a sufficiently large gap needs to be reserved between the locking nut and the pipeline. This not only leads to an increase in production costs, but also causes the pipeline to tilt due to the large gap, which in turn causes an increase in construction errors. In particular, long-distance pipeline construction will lead to accumulated errors, which need to be corrected during the construction process. At the same time, the tilt of the pipeline will also cause uneven force on the sealing ring, which will cause the sealing ring to be easily damaged and the sealing effect to be reduced.

[0005] Through the analysis of existing pipeline connection technology, it can be seen that although the existing pipeline connection provides many solutions, they all have some shortcomings to a greater or lesser extent, and none of them can take into account simple structure, convenient disassembly and assembly, reliable locking, good sealing effect and reliable locking. Therefore, it is necessary to conduct in-depth research and analysis on pipeline connection technology in order to achieve good sealing effect and reliable locking with a simpler and lower-cost structure.

[0006] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility model content:

[0007] The purpose of the utility model is to solve the problems existing in the prior art and provide a self-sealing pipe connection device. The liquid introduced into the pipe is innovatively used as the key part of the sealing structure, and the sealing and locking structure is designed on this basis. The utility model has the advantages of simple and reasonable structural design, low cost, convenient disassembly and assembly, good sealing effect, reliable locking, etc., which helps to improve the efficiency and quality of pipeline construction.

[0008] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0009] A self-sealing pipe connection device comprises a pipe fitting, wherein the pipe fitting is provided with a plurality of mutually connected pipe interfaces, the pipe is inserted into the pipe interface, an installation groove is provided on the inner wall of the pipe interface or on the outer wall of the pipe along the circumferential direction, a sealing ring is provided in the installation groove, and the sealing ring is arranged between the pipe interface and the pipe for sealing. After liquid is introduced into the pipe, the liquid acts on the sealing ring, and the corresponding installation groove and / or sealing ring are provided with a structure that cooperates with the liquid to increase the squeezing force of the sealing ring, and a locking mechanism for facilitating disassembly and assembly is provided between the pipe interface and the pipe, and the locking mechanism locks the pipe interface and the pipe.

[0010] The pipe fitting is provided with two pipe interfaces, three pipe interfaces or four pipe interfaces.

[0011] The sealing ring is designed as an O-ring, and the installation groove includes an integrally formed limiting portion and an inclined portion, the limiting portion is located on the inner side, the inclined portion is located on the outer side, and the depth of the inclined portion gradually decreases from the inside to the outside, the inner diameter of the O-ring is smaller than the outer diameter of the pipeline, and the limiting portion is used to prevent the O-ring from moving inward, and the liquid in the pipeline drives the O-ring to move outward and the squeezing force of the O-ring is increased under the action of the inclined portion.

[0012] The cross-sectional shape of the limiting portion is designed to be an arc shape, and the cross-sectional shape of the inclined portion is designed to be an arc shape.

[0013] The cross-sectional shape of the mounting groove is designed to be a triangle, the corresponding cross-sectional shape of the limiting portion is a vertical line, and the cross-sectional shape of the inclined portion is an inclined straight line.

[0014] The sealing ring is designed as a triangular sealing ring, and the corresponding cross-sectional shape of the mounting groove is designed as a triangle.

[0015] A spring sheet is provided between the inner side of the triangular sealing ring and the inner end of the mounting groove, and the spring sheet is used to drive the triangular sealing ring to move outward.

[0016] The sealing ring is designed as a U-shaped sealing ring, and the corresponding cross-sectional shape of the mounting groove is rectangular. The U-shaped sealing ring is provided with a U-shaped opening. The U-shaped sealing ring is horizontally arranged with the U-shaped opening facing inward. The U-shaped sealing ring is fixed to the inner wall of the mounting groove by bonding glue. The liquid in the pipeline enters the U-shaped opening of the U-shaped sealing ring and, under the action of the mounting groove, drives the U-shaped sealing ring to radially stretch and increase the extrusion.

[0017] The U-shaped sealing ring is internally provided with a U-shaped spring piece.

[0018] The sealing ring is designed as a V-shaped sealing ring, and the corresponding cross-sectional shape of the mounting groove is a triangle. A V-shaped opening is provided on the V-shaped sealing ring, and the V-shaped sealing ring is arranged horizontally with the V-shaped opening facing inward.

[0019] The locking mechanism includes a slot A arranged on the inner wall of the pipe interface, a slot B is arranged on the corresponding outer wall of the pipe, a C-shaped retaining ring is arranged in the slot A, a plurality of threaded holes A are arranged at intervals along the circumferential direction at the position corresponding to the slot A on the pipe interface, and a screw A is installed on the threaded hole A. The screw A pushes a part of the C-shaped retaining ring into the slot B to realize the locking connection between the pipe and the pipe fitting.

[0020] One of the screws A passes through the notch of the C-shaped retaining ring and directly acts on the pipe, and the remaining screws A directly act on the C-shaped retaining ring.

[0021] The locking mechanism includes a plurality of threaded holes B evenly spaced along the circumferential direction of the pipe interface, a screw B is provided on the threaded hole B, and a plurality of limiting blind holes evenly spaced along the circumferential direction are correspondingly provided on the pipe, and the lower end of the screw B is inserted into the limiting blind hole to realize the locking connection between the pipe fitting and the pipe.

[0022] The utility model adopts the above structure, which can bring the following beneficial effects:

[0023] For the pipeline connection sealing part, the liquid pressure in the pipeline is innovatively used as the key technical feature to increase the sealing effect. At the same time, the special extrusion structure on the installation groove and / or the sealing ring is used to increase the sealing effect. The sealing structure is simple and practical, has good sealing effect, is easy to disassemble and assemble, and has low cost. For the locking part of the pipe fitting and the pipeline, the present application directly adopts a simple and practical locking mechanism, which is not only reliable in locking, easy to disassemble and assemble, and can be reused, but also uses C-type retaining rings and screws to achieve locking by radial pressure, which can effectively reduce the gap between the pipe fitting and the pipeline, and help improve the accuracy of pipeline connection. The overall pipeline connection device has the advantages of simple structure, easy disassembly and assembly, flexible construction, good sealing effect, and reliable locking. Description of the drawings:

[0024] Figure 1 This is a structural schematic diagram of a self-sealing pipe connection device according to Embodiment 1 of the present utility model;

[0025] Figure 2 This is an exploded view of the self-sealing pipe connection device of Example 1 of the utility model;

[0026] Figure 3 This is a schematic diagram of the installation structure of the C-type retaining spring in Example 1 of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the pipe fitting of Example 1 of the utility model;

[0028] Figure 5 This is a schematic diagram of a pipe structure in which the installation groove is designed to be triangular in Example 1 of the utility model;

[0029] Figure 6 This is a structural schematic diagram of a self-sealing pipe connection device in which two pipe interfaces of a pipe fitting are vertically arranged in Example 1 of the utility model;

[0030] Figure 7 This is a structural schematic diagram of a self-sealing pipeline connection device for three pipeline interfaces of Example 1 of the utility model;

[0031] Figure 8 This is a structural schematic diagram of a self-sealing pipe connection device in which a mounting groove is arranged on the outer wall of a pipe in Embodiment 2 of the utility model;

[0032] Fig. 9 This is a schematic diagram of the structure of the pipeline in Example 2 of the utility model;

[0033] Fig.10 This is a structural schematic diagram of a self-sealing pipe connection device in which the sealing ring of Example 3 of the utility model adopts a triangular sealing ring;

[0034] Fig.11 This is a schematic diagram of the installation structure of the spring piece in Example 3 of the utility model;

[0035] Fig.12 This is a structural schematic diagram of a self-sealing pipe connection device in which the sealing ring of Example 4 of the utility model adopts a U-shaped sealing ring;

[0036] Fig.13 for Fig.12 A magnified view of part A in FIG.

[0037] Fig.14 This is a structural schematic diagram of a self-sealing pipe connection device in which the sealing ring of Example 5 of the utility model adopts a V-shaped sealing ring;

[0038] Fig.15 This is a schematic diagram of the structure of the locking mechanism of Example 6 of the utility model;

[0039] Fig.16 It is a structural schematic diagram of an existing pipeline connection device;

[0040] Fig.17 It is another structural schematic diagram of the existing pipeline connection device;

[0041] Fig.18 It is another structural schematic diagram of the existing pipeline connection device;

[0042] In the figure, 1. pipe fitting, 2. pipe interface, 3. pipe, 4. installation groove, 401. limiting part, 402. inclined part, 5. sealing ring, 501. O-ring, 502. triangular sealing ring, 503. U-shaped sealing ring, 504. U-shaped opening, 505. U-shaped spring piece, 506. V-shaped sealing ring, 507. V-shaped opening, 6. locking mechanism, 601. slot A, 602. slot B, 603. C-shaped retaining ring, 604. threaded hole A, 605. screw A, 606. notch, 607. threaded hole B, 608. screw B, 609. limiting blind hole, 7. spring piece, 8. bonding glue, 9. existing pipe connection structure, 901. existing pipe fitting, 902. existing nut, 903. installation groove, 904. limiting groove, 905. limiting component. Specific implementation method:

[0043] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0046] Furthermore, the terms “inner”, “outer”, “radial”, “axial”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the position of the indicated technical features.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "provided with", "set", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Example 1

[0049] like Figure 1-7As shown, the self-sealing pipe connection device includes a pipe fitting 1, on which a plurality of pipe interfaces 2 interconnected with each other are provided, a pipe 3 is inserted into the pipe interface 2, an installation groove 4 is provided on the inner wall of the pipe interface 2 along the circumferential direction, a sealing ring 5 is provided in the installation groove 4, and the sealing ring 5 is arranged between the pipe interface 2 and the pipe 3 for sealing. After liquid is passed into the pipe 3, the liquid here usually refers to water, the liquid acts on the sealing ring 5, and the corresponding installation groove 4 and / or the sealing ring 5 are provided with a structure that cooperates with the liquid to increase the squeezing force of the sealing ring 5, and a locking mechanism 6 for easy disassembly and assembly is provided between the pipe interface 2 and the pipe 3, and the locking mechanism 6 locks the pipe interface 2 and the pipe 3. Compared with the existing pipe connection structure 9 (including the existing pipe fitting 901, the existing nut 902, the installation groove 903, the limiting groove 904 and the limiting component 905), the present application innovatively uses the liquid pressure in the pipe 3 as the key technical feature to increase the sealing effect for the pipe connection sealing part, and at the same time cooperates with the special extrusion structure on the installation groove 4 and / or the sealing ring 5 (in this embodiment, it refers to the inclined portion 402) to achieve an increased sealing effect. The sealing structure is simple and practical, has a good sealing effect, is easy to disassemble and assemble, and has a low cost.

[0050] The pipe fitting 1 is provided with two pipe interfaces 2 or three pipe interfaces 2 (such as Figure 7 As shown) or four pipe interfaces 2. The number of pipe interfaces 2 is determined according to the number of pipes 3 that need to be connected. In practical applications, two pipe interfaces 2 are most commonly used, that is, two pipes 3 are connected in series. Of course, the angle between the two pipe interfaces 2 can be designed according to actual needs. For example, if two pipes 3 are connected in a straight line, the angle between the two pipe interfaces 2 is 180°. If two pipes 3 are connected vertically, the angle between the two pipe interfaces 2 is 90° (as shown). Figure 6 shown).

[0051] The sealing ring 5 is designed as an O-type sealing ring 501, and the installation groove 4 includes an integrally formed limiting portion 401 and an inclined portion 402, wherein the limiting portion 401 is located on the inner side, and the inclined portion 402 is located on the outer side, and the depth of the inclined portion 402 gradually decreases from the inner side to the outer side (the inclined portion 402 here is a structure that cooperates with the liquid to increase the extrusion force of the sealing ring 5, and has a good extrusion effect. The greater the liquid pressure, the better the sealing effect). The inner diameter of the O-type sealing ring 501 is smaller than the outer diameter of the pipe 3 (to achieve an interference fit, ensuring that the initial state can also have a sealing effect), and the limiting portion 401 prevents the O-type sealing ring 501 from moving inward. The liquid in the pipe 3 drives the O-type sealing ring 501 to move outward and increases the extrusion force of the O-type sealing ring 501 under the action of the inclined portion 402. The sealing ring 5 adopts the O-type sealing ring 501, and the installation groove 4 is designed as an integrally formed limiting portion 401 and an inclined portion 402, wherein the inclined portion 402 cooperates with the liquid in the pipe 3 to increase the extrusion seal.

[0052] The cross-sectional shape of the limiting portion 401 is designed to be an arc shape, and the arc-shaped structure matches the shape of the O-ring 501 , which can play a good limiting role. The cross-sectional shape of the inclined portion 402 is designed to be an arc shape, which has a good squeezing effect on the O-ring 501 .

[0053] The cross-sectional shape of the mounting groove 4 is designed to be triangular, the corresponding cross-sectional shape of the limiting portion 401 is a vertical line, and the cross-sectional shape of the inclined portion 402 is an inclined straight line. Another structural design of the mounting groove 4 is provided, which can also play a good role in limiting and squeezing and sealing the O-ring 501.

[0054] The locking mechanism 6 includes a clamping groove A601 arranged on the inner wall of the pipe interface 2, a corresponding clamping groove B602 is arranged on the outer wall of the pipe 3, a C-shaped clamping spring 603 is arranged in the clamping groove A601, and a plurality of threaded holes A604 are arranged at intervals along the circumferential direction on the pipe interface 2 corresponding to the clamping groove A601, and screws A605 are arranged on the threaded holes A604, and the screws A605 push a part of the C-shaped clamping spring 603 into the clamping groove B602 to realize the locking connection between the pipe 3 and the pipe fitting 1. The use of the C-shaped clamping spring 603 and the radial pushing method for locking can not only ensure reliable locking, but also the C-shaped clamping spring 603 can be completely temporarily stored in the clamping groove A601 at the beginning, which basically does not affect the insertion of the pipe 3 into the pipe fitting 1, so that the gap between the pipe fitting 1 and the pipe 3 can be effectively reduced, which helps to improve the construction quality.

[0055] One of the screws A605 passes through the notch 606 on the C-shaped retaining ring 603 and directly acts on the pipe 3, and the other screws A605 directly act on the C-shaped retaining ring 603. This design can prevent the pipe 3 from rotating relative to the pipe fitting 1 on the premise that the C-shaped retaining ring 603 can be radially pushed into the groove B602. The present application directly adopts a simple and practical locking mechanism 6, which is not only reliable in locking, convenient in disassembly and assembly, and can be reused, but also can reduce the gap between the pipe fitting 1 and the pipe 3 by adopting the C-shaped retaining ring 603 and the technical means of radial pushing, which helps to improve the accuracy of pipe connection. The overall pipe connection device has the advantages of simple structure, convenient disassembly and assembly, flexible construction, good sealing effect, reliable locking, etc.

[0056] Example 2

[0057] The difference between this embodiment and the above embodiment is that:

[0058] like Figure 8-9As shown, the outer wall of the pipe 3 is provided with a mounting groove 4 along the circumferential direction. This embodiment provides another design form of the mounting groove 4, and a corresponding selection can be made according to needs in actual application. In the accompanying drawings, the mounting groove 4 is illustrated by using an integrally formed limiting portion 401 and an inclined portion 402, and the sealing ring 5 is an O-ring 501.

[0059] Example 3

[0060] like Fig.10 As shown, the difference between this embodiment and the above embodiment is that:

[0061] The sealing ring 5 is designed as a triangular sealing ring 502, and the corresponding cross-sectional shape of the mounting groove 4 is designed as a triangle. Another structural form of the sealing ring 5 is provided, which utilizes the triangular characteristics to perform extrusion sealing.

[0062] like Fig.11 As shown, a spring piece 7 is provided between the inner side of the triangular sealing ring 502 and the inner end of the mounting groove 4, and the spring piece 7 is used to drive the triangular sealing ring 502 to move outward. The spring piece 7 is designed to ensure that the triangular sealing ring 502 is always in an extruded state, especially in an initial state.

[0063] Example 4

[0064] like Figure 12-13 As shown, the difference between this embodiment and the above embodiment is that:

[0065] The sealing ring 5 is designed as a U-shaped sealing ring 503, and the corresponding cross-sectional shape of the mounting groove 4 is rectangular. The U-shaped sealing ring 503 is provided with a U-shaped opening 504 (the U-shaped opening 504 is conducive to driving the U-shaped sealing ring 503 to extend vertically under the action of liquid, thereby increasing the extrusion sealing effect). The U-shaped sealing ring 503 is arranged horizontally and the U-shaped opening 504 is arranged inwardly. The outer side of the U-shaped sealing ring 503 is fixed to the inner wall of the mounting groove 4 by bonding glue 8. The liquid in the pipeline 3 enters the U-shaped opening 504 of the U-shaped sealing ring 503 and drives the U-shaped sealing ring 503 to extend radially to increase the extrusion under the action of the mounting groove 4. Taking full advantage of the U-shaped structural characteristics to design the sealing ring into a U-shaped sealing ring 503 can achieve the advantage of increasing the sealing effect, especially suitable for large-diameter pipeline connection (usually suitable for the case of a diameter of 50mm to 100mm).

[0066] The U-shaped sealing ring 503 is internally provided with a U-shaped spring piece 505 to further enhance the elasticity of the U-shaped sealing ring 503 and improve the sealing effect.

[0067] Example 5

[0068] like Fig.14 As shown, the difference between this embodiment and the above embodiment is that:

[0069] The sealing ring 5 is designed as a V-shaped sealing ring 506, and the corresponding cross-sectional shape of the mounting groove 4 is a triangle. The V-shaped sealing ring 506 is provided with a V-shaped opening 507. The V-shaped sealing ring 506 is arranged horizontally and the V-shaped opening 507 is arranged inward. The V-shaped opening 507 helps the liquid drive the V-shaped sealing ring 506 to move outward. The mounting groove 4 is designed to be triangular, which helps to squeeze the V-shaped sealing ring 506, thereby increasing the squeezing sealing effect.

[0070] Example 6

[0071] like Fig.15 As shown, the difference between this embodiment and the above embodiment is that:

[0072] The locking mechanism 6 includes a plurality of threaded holes B607 evenly spaced along the circumferential direction of the pipe interface 2, and a screw B608 is provided on the threaded hole B607. Correspondingly, a plurality of limiting blind holes 609 are evenly spaced along the circumferential direction on the pipe 3. The lower end of the screw B608 is inserted into the limiting blind hole 609 to achieve a locking connection between the pipe fitting 1 and the pipe 3. A radial thread setting is adopted, and the limiting blind hole can not only achieve axial limiting, but also prevent the pipe 3 from rotating relative to the pipe fitting 1. The locking is more firm and reliable, and it is convenient to disassemble and assemble.

[0073] The above specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0074] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A self-sealing pipe connection device, characterized in that: It comprises a pipe fitting, wherein the pipe fitting is provided with a plurality of mutually connected pipe interfaces, the pipe is inserted into the pipe interface, an installation groove is provided on the inner wall of the pipe interface or on the outer wall of the pipe along the circumferential direction, a sealing ring is provided in the installation groove, the sealing ring is arranged between the pipe interface and the pipe for sealing, after liquid is passed into the pipe, the liquid acts on the sealing ring, and the corresponding installation groove and / or sealing ring are provided with a structure that cooperates with the liquid to increase the squeezing force of the sealing ring, a locking mechanism for facilitating disassembly and assembly is provided between the pipe interface and the pipe, and the locking mechanism locks the pipe interface and the pipe.

2. The self-sealing pipe connection device according to claim 1, characterized in that: The pipe fitting is provided with two pipe interfaces, three pipe interfaces or four pipe interfaces.

3. The self-sealing pipe connection device according to claim 2, characterized in that: The sealing ring is designed as an O-ring, and the installation groove includes an integrally formed limiting portion and an inclined portion, the limiting portion is located on the inner side, the inclined portion is located on the outer side, and the depth of the inclined portion gradually decreases from the inside to the outside, the inner diameter of the O-ring is smaller than the outer diameter of the pipeline, and the limiting portion is used to prevent the O-ring from moving inward, and the liquid in the pipeline drives the O-ring to move outward and the squeezing force of the O-ring is increased under the action of the inclined portion.

4. The self-sealing pipe connection device according to claim 3, characterized in that: The cross-sectional shape of the position-limiting portion is designed to be in an arc shape, and the cross-sectional shape of the inclined portion is designed to be in an arc shape; Alternatively, the cross-sectional shape of the mounting groove is designed to be a triangle, the corresponding cross-sectional shape of the limiting portion is a vertical line, and the cross-sectional shape of the inclined portion is an inclined straight line.

5. The self-sealing pipe connection device according to claim 2, characterized in that: The sealing ring is designed as a triangular sealing ring, and the corresponding cross-sectional shape of the mounting groove is designed as a triangle. A spring sheet is provided between the inner side of the triangular sealing ring and the inner end of the mounting groove, and the spring sheet is used to drive the triangular sealing ring to move outward.

6. The self-sealing pipe connection device according to claim 2, characterized in that: The sealing ring is designed as a U-shaped sealing ring, and the corresponding cross-sectional shape of the mounting groove is rectangular. A U-shaped opening is provided on the U-shaped sealing ring. The U-shaped sealing ring is horizontally arranged with the U-shaped opening facing inward. The U-shaped sealing ring is fixed to the inner wall of the mounting groove by adhesive glue. The liquid in the pipeline enters the U-shaped opening of the U-shaped sealing ring and drives the U-shaped sealing ring to radially stretch and increase extrusion under the action of the mounting groove. The U-shaped sealing ring has a built-in U-shaped spring piece.

7. The self-sealing pipe connection device according to claim 2, characterized in that: The sealing ring is designed as a V-shaped sealing ring, and the corresponding cross-sectional shape of the mounting groove is a triangle. A V-shaped opening is provided on the V-shaped sealing ring, and the V-shaped sealing ring is arranged horizontally with the V-shaped opening facing inward.

8. The self-sealing pipe connection device according to any one of claims 1 to 7, characterized in that: The locking mechanism includes a slot A arranged on the inner wall of the pipe interface, a slot B is arranged on the corresponding outer wall of the pipe, a C-shaped retaining ring is arranged in the slot A, a plurality of threaded holes A are arranged at intervals along the circumferential direction at the position corresponding to the slot A on the pipe interface, and a screw A is installed on the threaded hole A. The screw A pushes a part of the C-shaped retaining ring into the slot B to realize the locking connection between the pipe and the pipe fitting.

9. The self-sealing pipe connection device according to claim 8, characterized in that: One of the screws A passes through the notch of the C-shaped retaining ring and directly acts on the pipe, and the remaining screws A directly act on the C-shaped retaining ring.

10. The self-sealing pipe connection device according to any one of claims 1 to 7, characterized in that: The locking mechanism includes a plurality of threaded holes B evenly spaced along the circumferential direction of the pipe interface, a screw B is provided on the threaded hole B, and a plurality of limiting blind holes evenly spaced along the circumferential direction are correspondingly provided on the pipe, and the lower end of the screw B is inserted into the limiting blind hole to realize the locking connection between the pipe fitting and the pipe.

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