Self-sealing structure for connecting small-diameter pipelines and connecting device

Abstract

The utility model relates to a self-sealing structure and a connecting device for connecting small-pipe-diameter pipelines, the self-sealing structure for connecting small-pipe-diameter pipelines comprises a connecting pipe fitting, the connecting pipe fitting is provided with a plurality of mutually communicated interfaces, the pipelines are inserted into the interfaces, the inner walls of the interfaces or the outer walls of the pipelines are provided with grooves along the circumferential direction, and the grooves are internally provided with O-shaped sealing rings. The groove comprises a limiting part and an inclined part which are integrally formed, the limiting part is located on the inner side, the inclined part is located on the outer side, the limiting part is used for preventing the O-shaped sealing ring from moving towards the inner side, and the depth of the inclined part is gradually decreased from inside to outside so that the O-shaped sealing ring can be extruded. The O-shaped sealing ring is driven to move towards the outer side under the action of liquid, and sealing is enhanced under the action of the inclined part. The small-diameter pipeline connecting device comprises the self-sealing structure, and a locking mechanism is arranged between the connecting pipe fitting and the pipeline. The device has the advantages of simple and reasonable structural design, flexibility in construction, high disassembly and assembly efficiency, good sealing effect, low production cost and the like.

Description

Technical field:

[0001] The utility model relates to the technical field of pipeline connection, in particular to a self-sealing structure and a connecting device for connecting small-diameter pipelines. Background technology:

[0002] In the process of pipeline construction, it is inevitable to connect the pipelines. When connecting the pipelines, connecting pipe fittings are needed. According to the number of connected pipelines, a corresponding number of interfaces are designed on the connecting pipe fittings, and then the interfaces are connected to the pipelines.

[0003] At present, for small-diameter pipeline connections, the connection methods between the interface and the pipeline are mainly threaded connection and compression fitting connection. Threaded connection refers to setting threads on the outer wall of the pipeline and the inner wall of the interface, and then connecting through threaded connection, and sealing with sealing rings. This threaded connection structure has the advantages of firm and reliable connection, but the disadvantage is also very obvious that the operation is very cumbersome during installation and later maintenance and replacement, which seriously restricts construction efficiency. Compression fittings are a kind of connector that connects the pipeline with a socket fitting with a special sealing ring, and uses special tools to press the pipe mouth to seal and fix. This structure has the characteristics of anti-pullout, anti-rotation, simple and convenient installation, and small required operating space. However, the connection structure of compression fittings cannot be reused. Therefore, when the pipeline needs to be replaced, the compression fittings at both ends can only be destroyed and new compression fittings can be used again. It cannot be reused.

[0004] In view of the existence of the above technical problems, various attempts have been made in the prior art to improve the structure, among which the relatively mature structures such as Fig. 9 As shown, it includes a pipe fitting, a locking nut and a sealing ring. The pipe fitting is aligned with the pipeline through the sealing ring, and then one end of the locking nut is connected to the pipeline through a detachable limiting structure, and the other end is threadedly connected to the pipe fitting through a thread. This structural design avoids direct threaded connection between the pipe fitting and the pipeline, but connects the pipe fitting and the pipeline together through the locking nut. This improved structure achieves relatively fast disassembly and assembly compared to the threaded connection structure, which has certain progress. However, this structure still has some unsatisfactory aspects in practical applications. For example, the existence of the limiting structure requires the processing of grooves on the pipeline and the inner wall of the pipe fitting, which will undoubtedly increase the production cost. For example, the design of adding a locking thread will not only increase the cost accordingly, but also still require threaded connection; for another example, the limiting structure usually requires the design of a limiting block, and in order to smoothly install the limiting block, the gap between the locking nut and the pipeline is large, which makes the pipeline easy to tilt, especially when long-distance construction is easy to deviate, affecting the construction quality. Therefore, it is necessary to further optimize and improve the connection of small-diameter pipelines in order to take into account the efficiency of disassembly and assembly, construction quality and production cost.

[0005] 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:

[0006] The purpose of the utility model is to solve the problems existing in the prior art and to provide a self-sealing structure and a connecting device for connecting small-diameter pipes, which have the advantages of simple and reasonable structural design, flexible construction, high disassembly and assembly efficiency, good sealing effect, and low production cost.

[0007] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0008] A self-sealing structure for connecting small-diameter pipes comprises a connecting pipe fitting, wherein the connecting pipe fitting is provided with a plurality of interconnected interfaces, wherein the pipe is inserted into the interface, and a groove is provided on the inner wall of the interface or the outer wall of the pipe along the circumferential direction, wherein an O-ring is provided in the groove, and the O-ring is located between the interface and the pipe for sealing, wherein the groove comprises an integrally formed limiting portion and an inclined portion, wherein the limiting portion is on the inner side and the inclined portion is on the outer side, wherein the limiting portion is used to prevent the O-ring from moving inwardly, wherein the depth of the inclined portion gradually decreases from the inside to the outside and is used to squeeze the O-ring, and after liquid is introduced into the pipe, the O-ring is driven to move outwardly under the action of the liquid and the sealing is enhanced under the action of the inclined portion.

[0009] The connecting pipe is provided with two interfaces, three interfaces or four interfaces.

[0010] The cross-sectional shape of the limiting portion is designed to be an arc shape matching the O-ring, and the cross-sectional shape of the inclined portion is designed to be a curve or a straight line.

[0011] The cross-sectional shape of the groove is 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 a straight line.

[0012] A small-diameter pipeline connecting device comprises the self-sealing structure as described above, and a locking mechanism is provided between the connecting pipe and the pipeline.

[0013] The locking mechanism includes a slot A arranged on the inner wall of the interface, a slot B is arranged on the corresponding outer wall of the pipeline, 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 interface, a screw A is arranged on the threaded hole A, and the screw A pushes a part of the C-shaped retaining ring into the slot B to realize the locking connection between the pipeline and the connecting pipe fitting.

[0014] The locking mechanism includes a plurality of threaded holes B spaced apart along the circumferential direction of the interface, a plurality of corresponding limiting grooves are provided on the pipe, a screw B is provided on the threaded hole B, and the lower end of the screw B is inserted into the limiting groove to lock the connecting pipe fitting and the pipe together.

[0015] The utility model adopts the above structure, which can bring the following beneficial effects:

[0016] By designing the connecting pipe fittings, grooves and O-rings, especially designing the limiter and inclined portion on the groove, the liquid pressure in the pipeline is fully utilized to drive the O-ring to move outward and cooperate with the inclined portion to perform extrusion sealing. The greater the liquid pressure, the better the sealing effect. The overall sealing structure is simple, practical, easy to disassemble and assemble, and has a good sealing effect. By designing a locking mechanism between the connecting pipe fittings and the pipeline, the locking mechanism has the advantages of easy disassembly and reliable locking, effectively reducing the gap between the connecting pipe fittings and the pipeline, and helping to improve the implementation quality and efficiency. Description of the drawings:

[0017] Figure 1 This is a structural schematic diagram of a self-sealing structure and a connecting device for connecting small-diameter pipes in Example 1 of the utility model;

[0018] Figure 2 This is an exploded view of a self-sealing structure and a connecting device for connecting small-diameter pipes according to Embodiment 1 of the utility model;

[0019] Figure 3 This is a schematic diagram of the installation structure of the C-type retaining spring in Example 1 of the utility model;

[0020] Figure 4 This is a structural schematic diagram of a connecting pipe fitting according to Embodiment 1 of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the connecting pipe fitting in which the groove adopts a triangle shape in Example 1 of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure in which the groove is arranged on the outer wall of the pipe in Example 2 of the utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the pipeline in Example 2 of the utility model;

[0024] Figure 8 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0025] Fig. 9 This is a schematic diagram of the existing pipeline connection structure;

[0026] In the figure, 1. connecting pipe fittings, 2. interface, 3. pipeline, 4. groove, 401. limiting part, 402. inclined part, 5. O-ring, 6. locking mechanism, 601. slot A, 602. slot B, 603. C-type retaining ring, 604. threaded hole A, 605. screw A, 606. threaded hole B, 607. limiting groove, 608. screw B, 7. existing pipe fittings, 8. locking nut, 9. existing sealing ring, 10. limiting block. Specific implementation method:

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Furthermore, the terms "inside", "outside", "A", "B", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the location of the indicated technical features.

[0031] 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.

[0032] It should be noted that the self-sealing structure of the present application is mainly applicable to the connection of small-diameter pipes, and has a significant sealing effect. However, this does not mean that the self-sealing structure of the present application is limited to the connection of small-diameter pipes, and can also be applied to the connection of medium- and large-diameter pipes. The technical effect is not as significant as that of the small-diameter pipe connection, but it can still be adopted.

[0033] Example 1

[0034] like Figure 1-5As shown, a self-sealing structure for connecting small-diameter pipes includes a connecting pipe 1, on which a plurality of interconnected interfaces 2 are provided, into which a pipe 3 is inserted, and an inner wall of the interface 2 is provided with a groove 4 along the circumferential direction, in which an O-ring 5 is provided, and the O-ring 5 is located between the interface 2 and the pipe 3 for sealing, and the groove 4 includes an integrally formed limiting portion 401 and an inclined portion 402, wherein the limiting portion 401 is on the inner side and the inclined portion 402 is on the outer side, and the limiting portion 401 is used to prevent the O-ring 5 from moving inward, and the depth of the inclined portion 402 gradually decreases from the inside to the outside, and is used to squeeze the O-ring 5. After liquid is introduced into the pipe 3, the O-ring 5 is driven to move outward under the action of the liquid and the sealing is enhanced under the action of the inclined portion 402. Compared with the existing pipe connection structure (such as Figure 6 As shown, including the existing pipe fitting 7, locking nut 8, existing sealing ring 9, limit block 10 and limit grooves respectively arranged on the pipe 5 and the locking nut 8), the connecting pipe fitting 1, groove 4 and O-ring 5 are designed, especially the limit part 401 and the inclined part 402 are designed on the groove 4, and the liquid pressure in the pipe 3 is fully utilized to drive the O-ring 5 and the inclined part 402 to cooperate for extrusion sealing, and the greater the liquid pressure, the better the sealing effect, and the sealing structure has the advantages of simple and practical, easy disassembly and assembly, and good sealing effect. Figure 1 The arrows in the figure indicate the direction of liquid flow.

[0035] The connecting pipe fitting 1 is provided with two interfaces 2, three interfaces 2 or four interfaces 2. The most commonly used are two interfaces 2, that is, to realize the series connection of two pipes 3. Of course, the angle between the two interfaces 2 (for example, 180°, 90°, etc.) can be designed according to actual needs.

[0036] The cross-sectional shape of the position-limiting portion 401 is designed to be an arc shape matching the O-ring 5, and the cross-sectional shape of the inclined portion 402 is designed to be a curve or a straight line. A specific structural form of the groove 4 is given.

[0037] The cross-sectional shape of the groove 4 is a triangle, the corresponding cross-sectional shape of the position-limiting portion 401 is a vertical line, and the cross-sectional shape of the inclined portion 402 is a straight line. Another specific structural form of the groove 4 is given.

[0038] The small-diameter pipe connection device comprises the self-sealing structure as described above, and a locking mechanism 6 is provided between the connecting pipe 1 and the pipe 3. The connecting pipe 1 and the pipe 3 are locked and connected by the locking mechanism 6.

[0039] The locking mechanism 6 includes a slot A601 arranged on the inner wall of the interface 2, a slot B602 is arranged on the corresponding outer wall of the pipe 3, a C-shaped retaining ring 603 is arranged in the slot A601, and a plurality of threaded holes A604 are arranged at intervals along the circumferential direction at the position corresponding to the slot A601 on the interface 2, and a screw A605 is arranged on the threaded hole A604, and the screw A605 pushes a part of the C-shaped retaining ring 603 into the slot B602 to realize the locking connection between the pipe 3 and the connecting pipe 1. The structure of the C-shaped retaining ring 603 and the screw A605 can realize rapid disassembly while realizing high-strength limiting (limiting surface close to one circle), meeting the requirements of safe and reliable locking structure and easy disassembly and assembly. It can be preferred in practical applications, especially in the construction of fire protection pipes. In practical applications, one of the screws A605 may not act on the C-shaped retaining ring 603 (the remaining screws A605 act on the C-shaped retaining ring 603), and the screw A605 directly acts on the groove B602 of the pipe 3, which can effectively prevent the pipe 3 from rotating relative to the connecting pipe fitting 1.

[0040] Example 2

[0041] The difference between this embodiment and embodiment 1 is that:

[0042] like Figure 6-7 As shown, a groove 4 is provided on the outer wall of the pipe 3 along the circumferential direction. The groove 4 can also be provided on the outer wall of the pipe 3 according to actual production requirements.

[0043] Example 3

[0044] The difference between this embodiment and the above embodiment is that:

[0045] like Figure 8 As shown, the locking mechanism 6 includes a plurality of threaded holes B606 arranged at intervals along the circumferential direction of the interface 2, and a plurality of limiting grooves 607 are provided on the corresponding pipe 3. The threaded holes B606 are provided with screws B608, and the lower ends of the screws B608 are inserted into the limiting grooves 607 to lock the connecting pipe 1 and the pipe 3 together. A specific structure of the locking mechanism 6 is given, which can not only realize quick disassembly and assembly, but also prevent the pipe 3 from rotating relative to the connecting pipe 1.

[0046] The above-mentioned 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.

[0047] 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 structure for connecting small diameter pipes, characterized in that: It comprises a connecting pipe fitting, which is provided with a plurality of interconnected interfaces, into which a pipeline is inserted, and a groove is provided on the inner wall of the interface or the outer wall of the pipeline along the circumferential direction, and an O-ring is provided in the groove, and the O-ring is located between the interface and the pipeline for sealing, and the groove comprises an integrally formed limiting portion and an inclined portion, wherein the limiting portion is on the inner side and the inclined portion is on the outer side, and the limiting portion is used to prevent the O-ring from moving inward, and the depth of the inclined portion gradually decreases from the inside to the outside and is used to squeeze the O-ring, and after liquid is introduced into the pipeline, the O-ring is driven to move outward under the action of the liquid and the sealing is enhanced under the action of the inclined portion.

2. The self-sealing structure for connecting small-diameter pipes according to claim 1, characterized in that: The connecting pipe is provided with two interfaces, three interfaces or four interfaces.

3. The self-sealing structure for connecting small-diameter pipes according to claim 1 or 2, characterized in that: The cross-sectional shape of the limiting portion is designed to be an arc shape matching the O-ring, and the cross-sectional shape of the inclined portion is designed to be a curve or a straight line.

4. The self-sealing structure for connecting small-diameter pipes according to claim 1 or 2, characterized in that: The cross-sectional shape of the groove is 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 a straight line.

5. Small diameter pipe connection device, characterized in that: It comprises a self-sealing structure for connecting small-diameter pipes as described in any one of claims 1 to 4, wherein a locking mechanism is provided between the connecting pipe and the pipe.

6. The small diameter pipe connection device according to claim 5, characterized in that: The locking mechanism includes a slot A arranged on the inner wall of the interface, a slot B is arranged on the corresponding outer wall of the pipeline, 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 interface, a screw A is arranged on the threaded hole A, and the screw A pushes a part of the C-shaped retaining ring into the slot B to realize the locking connection between the pipeline and the connecting pipe fitting.

7. The small diameter pipe connection device according to claim 5, characterized in that: The locking mechanism includes a plurality of threaded holes B spaced apart along the circumferential direction of the interface, a plurality of corresponding limiting grooves are provided on the pipe, a screw B is provided on the threaded hole B, and the lower end of the screw B is inserted into the limiting groove to lock the connecting pipe fitting and the pipe together.

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