Double-sealing connection structure of steel-plastic composite pipeline

Abstract

The utility model relates to the technical field of pipeline connection, and particularly discloses a steel-plastic composite pipeline double-sealing connection structure which comprises two sections of steel-plastic composite pipes, an inner-layer plastic sleeve and an outer-layer metal sleeve, the inner-layer plastic sleeve and the outer-layer metal sleeve are connected between the two sections of steel-plastic composite pipes, and the two ends of the inner-layer plastic sleeve are sleeved with the ends of the two sections of steel-plastic composite pipes respectively. An elastic rubber ring is arranged on the smooth section of the inner-layer plastic sleeve, a metal sealing ring is arranged at the end of the steel-plastic composite pipe, the metal sealing ring is coated with a nano ceramic coating, the outer-layer metal sleeve is of a cylindrical structure, and internal threads are arranged on the inner wall of the outer-layer metal sleeve. The two ends of the outer-layer metal sleeve are arranged at the butt joint ends of the two sections of steel-plastic composite pipes in a sleeving mode respectively and are in threaded connection with the steel-plastic composite pipes, the outer-layer metal sleeve comprises two semicircular cylinders which are arranged in a butt joint mode, connecting lug plates are arranged on the two sides of each semicircular cylinder, through holes are formed in the connecting lug plates, and the connecting lug plates of the two semicircular cylinders are fixed through bolts, so that double anchoring is achieved; and the stability, the sealing performance and the reliability of connection are improved.

Description

Technical Field

[0001] This utility model relates to the field of pipeline connection technology, and in particular to a double-closed connection structure for steel-plastic composite pipelines. Background Technology

[0002] In engineering fields such as water supply and drainage and gas transmission, steel-plastic composite pipes have been widely used due to their combination of the high strength of steel and the corrosion resistance of plastics. However, existing steel-plastic composite pipe connection methods have many problems, such as complex connection structures, the need for a large number of professional tools during installation, resulting in low construction efficiency; poor sealing effect, which easily leads to leakage during long-term use, especially when the pipe expands and contracts due to temperature changes, the sealing failure problem is more prominent, affecting the overall performance and service life of the pipe. Therefore, there is an urgent need for a steel-plastic composite pipe connection device that can effectively solve the above problems. Utility Model Content

[0003] The purpose of this utility model is to provide a double-closed connection structure for steel-plastic composite pipes to solve the technical problems of inconvenient installation and poor sealing effect in existing steel-plastic composite pipe connection methods.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A double-closed connection structure for steel-plastic composite pipes includes two sections of steel-plastic composite pipes, and an inner plastic sleeve and an outer metal sleeve connected between the two sections. The inner plastic sleeve is spindle-shaped with its outer diameter gradually decreasing from the middle to the end. The end of the inner plastic sleeve is a flat section with the same diameter. The ends of the two steel-plastic composite pipes are respectively fitted onto the two ends of the inner plastic sleeve. An elastic rubber ring is provided on the flat section of the inner plastic sleeve. A metal sealing ring is provided at the end of the steel-plastic composite pipe, and the metal sealing ring is coated with a nano-ceramic coating. The outer metal sleeve is a cylindrical structure with internal threads on its inner wall. The two ends of the outer metal sleeve are respectively fitted onto the butt joint ends of the two steel-plastic composite pipes and threadedly connected to the steel-plastic composite pipes. The outer metal sleeve includes two butt joint semi-cylinders. Each semi-cylinder has a connecting lug on both sides, and the connecting lugs have through holes. The connecting lugs of the two semi-cylinders are fixed together by bolts.

[0006] Furthermore, the steel-plastic composite pipe includes a plastic layer in the inner layer and a metal layer in the outer layer.

[0007] Furthermore, the metal sealing ring is coated with a nano-ceramic coating.

[0008] Furthermore, the length of the inner plastic sleeve is greater than the length of the outer metal sleeve.

[0009] Furthermore, the outer surface of the inner plastic sleeve is provided with barbed protrusions.

[0010] Compared with the prior art, this utility model has the following features and beneficial effects:

[0011] This invention achieves double anchoring by setting an outer metal sleeve that engages with the outer wall of the steel-plastic composite pipe through threaded engagement, and an inner plastic sleeve with barbed protrusions that fuse with the inner plastic layer of the steel-plastic composite pipe. This improves the stability and reliability of the connection. The elastic rubber ring of the inner plastic sleeve can expand when heated, compensating for material contraction when cooled, adapting to temperature differences and deformation, achieving dynamic sealing, and effectively preventing leakage. The nano-ceramic coating on the surface of the metal sealing ring significantly improves corrosion resistance. The outer metal sleeve is locked by hand rotation, eliminating the need for complex professional tools, enabling quick single-point connection, greatly improving construction efficiency, reducing construction costs, and possessing safety and applicability. It has good promotion and practical value, and its widespread application will generate good economic benefits. Attached Figure Description

[0012] Figure 1 This is a partial cross-sectional view of the present invention.

[0013] Figure 2 This is a schematic diagram of the cross-sectional structure of the outer metal sleeve of this utility model.

[0014] Reference numerals: 1. Steel-plastic composite pipe; 2. Inner plastic sleeve; 3. Outer metal sleeve; 4. Connecting ear plate; 5. Bolt; 6. Metal sealing ring. Detailed Implementation

[0015] To make the technical means, innovative features, objectives and effects of this utility model easier to understand, the utility model will be further described below.

[0016] The embodiments described herein are specific implementations of this utility model, used to illustrate the concept of this utility model. They are all illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of this utility model. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0017] This utility model discloses a double-closed connection structure for steel-plastic composite pipes, such as Figure 1 and Figure 2As shown, the device includes two steel-plastic composite pipe sections 1, and an inner plastic sleeve 2 and an outer metal sleeve 3 connected between the two sections 1. The length of the inner plastic sleeve 2 is greater than the length of the outer metal sleeve 3. The outer metal sleeve 3 has a tapered end. The steel-plastic composite pipe 1 includes a plastic layer in the inner layer and a metal layer in the outer layer. The inner plastic sleeve 2 is spindle-shaped, with its outer diameter gradually decreasing from the middle to the end. The end of the inner plastic sleeve 2 is a flat section with the same diameter. The outer surface of the inner plastic sleeve 2 has a barbed protrusion structure. The ends of the two steel-plastic composite pipe sections 1 are respectively fitted onto the two ends of the inner plastic sleeve 2. The barbed protrusion structure on the inner plastic sleeve 2 is embedded into the inner layer of the steel-plastic composite pipe 1 after being heat-melted. A plastic layer increases the friction coefficient between the inner plastic sleeve 2 and the steel-plastic composite pipe 1, achieving a stable and sealed connection. An elastic rubber ring is provided on the gentle section of the inner plastic sleeve 2. When the inner plastic sleeve 2 is heated, the elastic rubber ring also expands, achieving a secondary seal between the inner plastic sleeve 2 and the steel-plastic composite pipe 1. This also compensates for material contraction due to temperature changes, ensuring the reliability of the seal. A metal sealing ring 6 is provided at the end of the steel-plastic composite pipe 1. The surface of the metal sealing ring 6 is coated with a nano-ceramic coating, which has excellent corrosion resistance, effectively protecting the metal sealing ring 6 and extending its service life. Simultaneously, the metal sealing ring 6 can... During the connection process, the small gaps at the end face of the steel-plastic composite pipe 1 are filled, serving as an initial seal. The outer metal sleeve 3 has a cylindrical structure with internal threads on its inner wall. Both ends of the outer metal sleeve 3 are respectively fitted onto the joint ends of the two steel-plastic composite pipe sections 1 and threadedly connected to the steel-plastic composite pipe 1. The outer metal sleeve 3 includes two butt-jointed semi-cylindrical sections, each with a semi-cylindrical tubular structure. Connecting lugs 4 are provided on both sides of the semi-cylindrical sections, and through holes are opened on the connecting lugs 4. The connecting lugs 4 of the two semi-cylindrical sections are fixed together by bolts 5. A pressure indicator strip is provided on the outer side of the outer metal sleeve 3. During installation, first select an inner plastic sleeve 2 and an outer metal sleeve 3 with appropriate pipe diameters according to the steel-plastic composite pipe 1, and then connect the required... The ends of the two connected steel-plastic composite pipes 1 are ground and coated with epoxy primer according to the pretreatment steps. Then, the inner plastic sleeve 2 is heated at both ends using a heating device. After softening, it is quickly inserted into the end of the steel-plastic composite pipe 1, so that the barbed protrusions on the inner plastic sleeve 2 are fused with the inner plastic layer of the steel-plastic composite pipe 1. Then, the outer metal sleeve 3 is put on the joint end of the two steel-plastic composite pipes 1 and rotated by hand to tighten the outer metal sleeve 3 through the thread. The outer metal sleeve 3 tightens the inner plastic sleeve 2 and the steel-plastic composite pipe 1, sealing and securing them. Finally, the external pressure indicator bar is observed. When the color changes from red to green, it indicates that the connection is in place and the connection is complete.

[0018] This invention achieves double anchoring by setting an outer metal sleeve that engages with the outer wall of the steel-plastic composite pipe through threaded engagement, and an inner plastic sleeve with barbed protrusions that fuse with the inner plastic layer of the steel-plastic composite pipe. This improves the stability and reliability of the connection. The elastic rubber ring of the inner plastic sleeve can expand when heated, compensating for material contraction when cooled, adapting to temperature difference deformation, and achieving dynamic sealing to effectively prevent leakage. The nano-ceramic coating on the surface of the metal sealing ring significantly improves corrosion resistance. The outer metal sleeve is locked by hand rotation, eliminating the need for complex professional tools and enabling quick single-point connection, greatly improving construction efficiency and reducing construction costs.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0020] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-closed connection structure for steel-plastic composite pipes, characterized in that: The utility model provides a steel-plastic composite pipe, which comprises two steel-plastic composite pipes (1), an inner plastic sleeve (2) and an outer metal sleeve (3) connected between the two steel-plastic composite pipes (1), the inner plastic sleeve (2) is in a shape of a spindle tapering from a middle outer diameter to an end outer diameter, the end of the inner plastic sleeve (2) is a flat section with the same diameter, the two steel-plastic composite pipes (1) are respectively sleeved at the two ends of the inner plastic sleeve (2), an elastic rubber ring is arranged on the flat section of the inner plastic sleeve (2), a metal sealing ring (6) is arranged at the end of the steel-plastic composite pipe (1), the metal sealing ring (6) is coated with a nano ceramic coating, the outer metal sleeve (3) is in a cylindrical structure, an inner thread is arranged on the inner wall of the outer metal sleeve (3), the outer metal sleeve (3) is sleeved at the butt joint ends of the two steel-plastic composite pipes (1), and the two steel-plastic composite pipes (1) are threadedly connected, the outer metal sleeve (3) comprises two semicylinders arranged in butt joint, connecting lugs (4) are arranged on the two sides of the semicylinders, through holes are formed in the connecting lugs (4), and the connecting lugs (4) of the two semicylinders are fixed through bolts (5).

2. The steel-plastic composite pipe double tight connection structure according to claim 1, characterized in that: The steel-plastic composite pipe (1) comprises a plastic layer arranged in an inner layer and a metal layer arranged in an outer layer.

3. The steel-plastic composite pipe double-female connection structure according to claim 2, characterized in that: The metal sealing ring (6) is coated with a nano ceramic coating.

4. The steel-plastic composite pipe double-female connection structure according to claim 1, characterized in that: The length of the inner plastic sleeve (2) is greater than the length of the outer metal sleeve (3).

5. The steel-plastic composite pipe double-fusion connection structure according to any one of claims 1-4, characterized in that: The outer surface of the inner plastic sleeve (2) is provided with barb-shaped protruding structures. The outer surface of the inner plastic sleeve (2) is provided with barb-shaped protruding structures.

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