Pipeline injection molding joint and butt joint device

Abstract

The utility model discloses a pipeline injection molding joint and a butt joint device, and relates to the technical field of pipeline connection, the pipeline injection molding joint comprises a tubular joint main body, the end face of the joint main body is provided with a butt joint part which is inward along the radial direction, and the butt joint part is also provided with an inner sealing part which extends along the axial direction; and an annular sealing cavity is formed among the joint main body, the butt joint part and the inner sealing part. According to the pipeline injection molding connector, the sealing cavity used for wrapping the end of the pipeline is formed among the connector body, the butt joint part and the inner sealing part; by optimizing the structure of the injection molding joint, the contact area of the injection molding joint and the inner wall of the pipeline can be effectively increased, the sealing performance of the pipeline and the injection molding joint can be improved, the joint can be suitable for section unsealed connection of the composite pipe, and media in the pipe are prevented from permeating into a composite layer.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, and more specifically, to a pipeline injection molding joint and a docking device. Background Art

[0002] As requirements for pipeline networks increase, composite pipes with reinforced layers are attracting attention due to their excellent mechanical properties. At the same pressure level, composite pipes have thinner walls than pure plastic pipes, effectively reducing production and operating costs. However, the presence of these layers in composite pipes makes them difficult to connect after fracture. Improper connection can easily lead to the transported medium seeping into the composite layer, causing failure of the pipeline system.

[0003] The existing method for butt-jointing composite pipes is to use a hot air welding gun or a micro extrusion welding gun for sealing. Both hot air gun and extrusion welding gun welding seals squeeze molten thermoplastic onto the cold wall of the pipe end face, which easily causes a cold weld and poor reliability. In addition, composite pipes have always had problems with sealing technology, such as long sealing time, low construction efficiency, and poor sealing appearance quality. In addition, since composite pipes contain a variety of different materials, they cannot be directly connected using hot melt butt-jointing methods. They must use connectors such as electric fusion or metal deduction, which are costly and not conducive to popularization and application. Therefore, it is necessary to study a cross-section butt joint that can be used for composite pipes, which can prevent the problem of pipeline system failure caused by leakage from the composite pipe end face, resulting in the medium entering the composite layer of the composite pipe, while reducing connection costs, improving reliability, and improving construction efficiency.

[0004] Patent CN100553931C proposes a production process and product for steel-framed plastic composite pipes with plastic end caps. The process involves rapidly inserting the end of the steel-framed plastic composite pipe into an injection mold for injection molding. The injection mold comprises an outer injection mold that is sleeved onto the steel-framed plastic composite pipe and an internal fixed core shaft coaxially disposed within the outer injection mold with the steel-framed plastic composite pipe. The outer injection mold is a half mold with an annular inner concave mold cavity formed on its inner wall. The end of the steel-framed plastic composite pipe is placed within the annular inner concave mold cavity to form an injection end cap. The provision of the injection end cap solves the problem of the difficulty of using hot-melt butt-welding to connect steel-framed plastic composite pipes. By using hot-melt butt-welding, the steel-framed and plastic end face connectors of the steel-framed plastic composite pipe with the injection end caps are melted together, completely eliminating the delamination and peeling phenomenon at the steel-plastic interface of the composite pipe end, and greatly improving reliability. However, since only a small cross-section of the inner layer of the composite pipe is in contact with the plastic end, it is difficult to form a seal on the inner wall of the composite pipe through the injection molding process alone, which can easily cause the medium in the pipe to penetrate into the composite layer, thereby causing failure of the pipeline system. Utility Model Content

[0005] The utility model aims to overcome the defects and shortcomings of the existing pipeline joints, such as poor anti-seepage and reliability, and to provide a pipeline injection-molded joint.

[0006] Another object of the present invention is to provide a pipe docking device.

[0007] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0008] The utility model protects a pipe injection joint, including a tubular joint body, the end face of the joint body is provided with a radially inward docking portion, and the docking portion is also provided with an axially extending inner sealing portion, so that an annular sealing cavity is formed between the joint body, the docking portion and the inner sealing portion.

[0009] The pipe injection molded joint of the utility model comprises a joint body, a butt joint part and an inner sealing part. The inner sealing part extends to the inner wall of the pipe, so that a sealed cavity for covering the end of the pipe is formed between the joint body, the butt joint part and the inner sealing part. By optimizing the injection molded joint structure, the contact area between the injection molded joint and the inner wall of the pipe can be effectively increased, so that the pipe injection molded joint and the pipe are tightly combined, and the sealing performance of the pipe and the injection molded joint is improved. It can be applied to the unsealed connection of the cross section of the composite pipe to prevent the medium in the pipe from penetrating into the composite layer.

[0010] In one embodiment, the pipe injection joint is made of a material that can be hot-melt connected; the material includes but is not limited to PE, PP-R, PB and PE-RT.

[0011] In one embodiment, the inner sealing portion has a gradual thickness decreasing in a direction away from the butt joint. The gradual thickness of the inner sealing portion can achieve a buffering effect, reduce the impact of the medium in the pipe on the joint, and reduce the turbulent movement of the medium in the pipe.

[0012] Preferably, in the axial cross section of the inner sealing portion, the bottom surface thereof is straight or arc-shaped.

[0013] Preferably, the ratio of the length of the inner sealing portion in the axial direction to the thickness of the sealing cavity is (0.5-5):1, preferably (2-4):1.

[0014] In one embodiment, the inner bottom surface of the butt joint is provided with a concave area, which can receive the flanging material overflowing from the hot melt butt joint interface, thereby reducing the influence of the medium flow in the flanging material tube.

[0015] Preferably, the maximum thickness of the concave area at the edge of the concave area coincides with the maximum thickness of the inner sealing portion.

[0016] In one embodiment, a plurality of the pipe injection joints are connected by hot-melt butt-jointing the butt joints, and the butt joint surfaces of the butt joints are connected to the concave area.

[0017] In one embodiment, a gradient portion is provided on one side of the connector body away from the docking portion, and a thickness of the gradient portion gradually decreases in a direction away from the docking portion.

[0018] In one embodiment, the pipe injection joint is an integrally formed structure.

[0019] In one embodiment, when the pipe injection molding joint is connected to a pipe, the end of the pipe is embedded in the sealing cavity, and the outer wall of the pipe is fixedly connected to the joint body, and the inner wall of the pipe is fixedly connected to the inner sealing part.

[0020] In one embodiment, the fixed connection method includes injection molding and welding.

[0021] In one embodiment, the pipe is made of a composite pipe.

[0022] Preferably, the composite tube includes but is not limited to a wire mesh tube and a continuous glass fiber tape composite tube.

[0023] Preferably, the base material of the composite pipe is thermoplastic, including but not limited to PE, PPR and PE-RT.

[0024] The utility model protects a pipeline butt joint device, which comprises the pipeline injection-molded joint.

[0025] In one embodiment, the pipe injection molded joint is connected to the flange. When the pipe docking device is used to connect the pipes, the connecting part of each pipe is connected to the injection molded joint. The pipe injection molded joints abut against each other and the flange is locked by fasteners.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The utility model provides a pipe injection joint comprising a joint body, a butt joint part and an inner sealing part, wherein the inner sealing part extends to the inner wall of the pipe, so that a sealed cavity for covering the end of the pipe is formed between the joint body, the butt joint part and the inner sealing part; through the optimization of the injection joint structure, the contact area between the injection joint and the inner wall of the pipe can be effectively increased, which is beneficial to improving the sealing performance of the pipe and the injection joint, and can be applied to the unsealed connection of the cross section of the composite pipe to prevent the medium in the pipe from penetrating into the composite layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a cross-sectional view of a pipe injection joint according to Example 1 of the present utility model.

[0029] Figure 2 This is a cross-sectional view of a pipe injection-molded joint in a docking state according to Example 1 of the present utility model.

[0030] Figure 3 This is a cross-sectional view of a pipe injection molding joint according to Example 2 of the present utility model.

[0031] Figure 4 This is a cross-sectional view of a pipe docking device according to Example 3 of the present utility model.

[0032] Among them, 11. Joint body; 12. Butt joint; 13. Inner sealing part; 14. Concave area; 15. Gradient part; 2. Composite pipe; 3. Sealing layer; 4. Flanging material; 51. Flange; 52. Fastener; 53. Sealing gasket. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with specific implementations, but the examples do not limit the present invention in any form.

[0034] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent.

[0035] In order to overcome the technical problems of poor impermeability and reliability of existing pipe joints, the utility model proposes a pipe injection joint, including a tubular joint body, the end face of the joint body is provided with a radially inward docking portion, and the docking portion is further provided with an axially extending inner sealing portion, so that an annular sealed cavity is formed between the joint body, the docking portion and the inner sealing portion.

[0036] The pipe injection molded joint of the utility model comprises a joint body, a butt joint part and an inner sealing part. The inner sealing part extends to the inner wall of the pipe, so that a sealed cavity for covering the end of the pipe is formed between the joint body, the butt joint part and the inner sealing part. By optimizing the injection molded joint structure, the contact area between the injection molded joint and the inner wall of the pipe can be effectively increased, so that the pipe injection molded joint and the pipe are tightly combined, and the sealing performance of the pipe and the injection molded joint is improved. It can be applied to the unsealed connection of the cross section of the composite pipe to prevent the medium in the pipe from penetrating into the composite layer.

[0037] Preferably, the inner sealing portion has a gradual thickness decreasing in a direction away from the butt joint. The gradual structure of the inner sealing portion can achieve a buffering effect, reduce the impact of the medium in the pipe on the joint, and weaken the turbulent movement of the medium in the pipe.

[0038] Preferably, the inner bottom surface of the butt joint is provided with a concave area, which can receive the flanging material overflowing from the hot-melt butt joint interface, thereby reducing the influence of the flanging material on the flow of the medium in the pipe.

[0039] The utility model also provides a pipeline butt joint device, comprising the pipeline injection-molded joint.

[0040] Preferably, the pipe injection molding joint is connected to the flange. When the pipe docking device is used to connect the pipes, the connecting part of each pipe is connected to the injection molding joint. The pipe injection molding joints abut against each other and the flange is locked by fasteners.

[0041] Example 1

[0042] A pipe injection joint, such as Figure 1 As shown, it includes a tubular joint body 11, the end face of which is provided with a radially inward docking portion 12, and the docking portion 12 is further provided with an axially extending inner sealing portion 13, so that an annular sealing cavity is formed between the joint body 11, the docking portion 12 and the inner sealing portion 13.

[0043] A gradient portion 15 is provided on one side of the connector body 11 away from the docking portion 12 , and the thickness of the gradient portion 15 gradually decreases in the direction away from the docking portion 12 .

[0044] The inner sealing portion 13 has a gradual thickness that decreases as it moves away from the butt joint 12. In an axial cross-section, the bottom surface of the inner sealing portion 13 is a straight line, and its angle with the inner wall of the pipe is acute. This gradual structure of the inner sealing portion 13 provides a buffering effect, reducing the impact of the medium in the pipe on the joint and attenuating turbulent flow of the medium within the pipe.

[0045] In the pipe injection joint of the utility model, an annular sealing cavity is formed between the joint body 11, the docking part 12 and the inner sealing part 13; through the optimization of the injection joint structure, the contact area between the injection joint and the inner wall of the pipe can be effectively increased, which is beneficial to improving the sealing performance of the pipe and the injection joint. It can be suitable for the cross-section docking of composite pipes to prevent the medium in the pipe from penetrating into the composite layer.

[0046] As an embodiment, the process of connecting the pipe injection molding joint with the composite pipe 2 (wire mesh pipe, PE100) is as follows: first, the end face of the composite pipe 2 is sealed, and a sealing layer 3 is formed on the end face of the composite pipe 2. Then, the area of ​​the composite pipe 2 that needs to be injection molded is polished to remove the oxide layer. Then, the outer wall of the composite pipe 2 in the injection molding joint area is heated to 120°C using an annular infrared heater, and then quickly inserted into a dedicated injection mold to complete the injection molding. The injection molding material is PE100, thereby obtaining the pipe injection molding joint. At this time, the end of the composite pipe 2 is embedded in the sealed cavity of the injection molding joint, and at the same time, the outer wall of the composite pipe 2 is injection-molded and welded to the joint body 11, and the inner wall of the composite pipe 2 is injection-molded and welded to the inner sealing part 13.

[0047] like Figure 2 As shown, the pipe injection joints are connected by hot-melt butt welding, which can achieve cross-sectional connectivity of the composite pipe 2 and provide high reliability. The inner bottom surface of the butt joint 12 of the pipe injection joint is provided with a concave area 14. The concave area 14 can accommodate the flange material 44 overflowing from the hot-melt butt welding interface, reducing the impact of the flange material 44 on the flow of the medium in the pipe.

[0048] Example 2

[0049] A pipe injection joint, such as Figure 3 As shown, it includes a tubular joint body 11, the end face of which is provided with a radially inward docking portion 12, and the docking portion 12 is further provided with an axially extending inner sealing portion 13, so that an annular sealing cavity is formed between the joint body 11, the docking portion 12 and the inner sealing portion 13.

[0050] A gradient portion 15 is provided on one side of the connector body 11 away from the docking portion 12 , and the thickness of the gradient portion 15 gradually decreases in the direction away from the docking portion 12 .

[0051] In this embodiment, the inner sealing portion 13 has a gradual thickness decreasing away from the butt joint 12. In a pipe injection fitting, the inner sealing portion 13 has a gradual thickness decreasing away from the butt joint 12, and the bottom surface of the inner sealing portion 13 in an axial cross-section is curved. This gradual structure of the inner sealing portion 13 provides a buffering effect, reducing the impact of the medium in the pipe on the fitting and attenuating turbulent flow of the medium in the pipe.

[0052] As an embodiment, the process of connecting the pipe injection molding joint with the composite pipe 2 (continuous glass fiber tape composite pipe) is as follows: first, the end face of the composite pipe 2 is sealed, and a sealing layer 3 is formed on the end face of the composite pipe 2. Then, the area of ​​the composite pipe 2 that needs to be injection molded is polished to remove the oxide layer. Then, the outer wall of the injection molding joint area of ​​the composite pipe 2 is heated to 120°C using an annular infrared heater, and then quickly inserted into a dedicated injection mold to complete the injection molding. The injection molding material is PE100, thereby obtaining the pipe injection molding joint. At this time, the end of the composite pipe 2 is embedded in the sealed cavity of the injection molding joint, and at the same time, the outer wall of the composite pipe 2 is injection-molded and welded to the joint body 11, and the inner wall of the composite pipe 2 is injection-molded and welded to the inner sealing part 13.

[0053] The pipe injection joints are connected by hot-melt butt welding, achieving cross-sectional connectivity across the composite pipe 2 with high reliability. The inner bottom surface of the butt joint 12 of the pipe injection joint is provided with a concave area 14. This concave area 14 can accommodate the flanging material 44 that overflows from the hot-melt butt welding interface, reducing the impact of the flanging material 44 on the flow of the medium within the pipe.

[0054] Example 3

[0055] A pipe docking device, such as Figure 4 As shown, the pipe injection fitting comprises a flange 51, a fastener 52, and a pipe injection fitting. The pipe injection fitting comprises a tubular fitting body 11, the end face of which is provided with a radially inwardly directed butt joint 12. The butt joint 12 is further provided with an axially extending inner sealing portion 13, forming an annular sealed cavity between the fitting body 11, the butt joint 12, and the inner sealing portion 13. The butt joint 12 extends radially outward to form a flange-like flange structure. The structures of the fitting body 11 and the inner sealing portion 13 are the same as those in Example 1.

[0056] When the pipe docking device is used to connect the composite pipe 2, the connection part of each composite pipe 2 is connected to the injection molding joint, and the connection method between the sealing cavity of the pipe injection molding joint and the composite pipe 2 is the same as that in Example 1, and the pipe injection molding joint is connected.

[0057] The connection method between the two pipe injection-molded joints is as follows: two flanges 51 are respectively mounted on the joint body 11 and abut against the two sides of the flange-shaped flange structure. A fastener 52 is installed between the flanges 51. By tightening the fastener 52 and acting on the flanges 51, the pipe injection-molded joint is locked and connected, thereby achieving the connection between the two composite pipes 2 through the pipe docking device. The fastener 52 is not particularly limited and can adopt a conventional fastening structure. In this embodiment, a bolt and nut are used as the fastener 52 for locking.

[0058] As a preferred embodiment, a sealing gasket 53 is further installed at the connection interface between the pipe injection molding joints of this embodiment, thereby improving the sealing performance of the gap between the pipe injection molding joints.

[0059] The above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pipe injection joint, comprising a tubular joint body (11), wherein the end surface of the joint body (11) is provided with a radially inward docking portion (12), characterized in that: The butt joint (12) is further provided with an inner sealing portion (13) extending in the axial direction, so that an annular sealing cavity is formed between the joint body (11), the butt joint (12) and the inner sealing portion (13).

2. The pipe injection joint according to claim 1, characterized in that: The inner sealing portion (13) presents a gradual structure in which the thickness gradually decreases in a direction away from the docking portion (12).

3. The pipe injection joint according to claim 1, characterized in that: The inner bottom surface of the docking portion (12) is provided with a concave area (14).

4. The pipe injection joint according to claim 3, characterized in that: The plurality of pipe injection joints are connected by hot-melt butt-jointing via the butt joint (12), and the butt joint surface of the butt joint (12) is connected to the concave area (14).

5. The pipe injection joint according to claim 1, characterized in that: A gradient portion (15) is provided on one side of the joint body (11) away from the docking portion (12), and the thickness of the gradient portion (15) gradually decreases in the direction away from the docking portion (12).

6. The pipe injection joint according to any one of claims 1 to 5, characterized in that: The pipe injection joint is an integrally formed structure.

7. The pipe injection joint according to claim 1, characterized in that: When the pipe injection joint is connected to a pipe, the end of the pipe is embedded in the sealing cavity, the outer wall of the pipe is fixedly connected to the joint body (11), and the inner wall of the pipe is fixedly connected to the inner sealing portion (13).

8. The pipe injection joint according to claim 7, characterized in that: The material of the pipeline is a composite pipe (2).

9. A pipe docking device, characterized in that: The invention comprises the pipe injection molding joint according to any one of claims 1 to 8.

10. The pipe docking device according to claim 9, characterized in that: The pipe injection joint is connected to the flange (51). When the pipe docking device is used to connect the pipes, the connecting portion of each pipe is connected to the injection joint. The pipe injection joints abut against each other and the flange (51) is locked by a fastener (52).

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