Double-layer directly-buried connecting pipe

Abstract

The utility model relates to the technical field of double-layer pipes, in particular to a double-layer directly-buried connecting pipe which comprises an inner pipe, an outer pipe and a connecting ring, the outer pipe is arranged outside the inner pipe in a sleeving mode, a gap is formed between the outer pipe and the inner pipe, T-shaped rods are fixedly connected to the peripheral side wall of the inner pipe, and the T-shaped rods are arranged in a cross-shaped array in the circumferential direction of the inner pipe; a T-shaped groove allowing the T-shaped rod to penetrate through is formed in the inner wall of the outer pipe, one end of the T-shaped groove is closed, one end of the T-shaped groove penetrates through the end wall of the outer pipe, the connecting ring is fixedly connected to the end wall, where the T-shaped groove penetrates through, of the outer pipe, and the connecting ring abuts against the end face of the T-shaped rod. The double-layer directly-buried connecting pipe has the effect of enhancing the structural strength.

Description

Technical Field

[0001] The present application relates to the technical field of double-layer pipes, and in particular to a double-layer direct-buried connecting pipe. Background Art

[0002] Direct buried heating pipelines, also called direct buried heating insulation pipes, are a common equipment widely used for long-distance transmission of heat flow media. Direct buried heating pipelines are the most commonly used system form for centralized heating in my country. The operation safety of direct buried heating pipelines is related to all aspects of urban work and life. Current research shows that direct buried heating pipelines are subject to complex loads such as self-weight, fluid pressure in the pipe, static pressure of the surrounding soil outside the pipe, and dynamic earth pressure of motor vehicles during operation. The determination of the stress state of direct buried heating pipelines is very complicated. Therefore, the performance requirements for direct buried pipe fittings are higher than those for ordinary pipe fittings, especially the structural strength of the direct buried connecting pipes used to connect two adjacent direct buried heating pipelines. Once the structural strength of the direct buried connecting pipes is weak, it is easy to cause damage to the pipeline structure and cause safety accidents. Therefore, strengthening the structural strength of the direct buried connecting pipes is of great significance to improving the safety and reliability of the heating system. Utility Model Content

[0003] In order to enhance the structural strength of the direct buried connecting pipe, the present application provides a double-layer direct buried connecting pipe.

[0004] The double-layer direct buried connecting pipe provided in this application adopts the following technical solution:

[0005] A double-layer direct-buried connecting pipe comprises an inner pipe, an outer pipe and a connecting ring. The outer pipe is sleeved on the outside of the inner pipe and is separated from the inner pipe by a gap. A T-rod is fixedly connected to the circumferential side wall of the inner pipe. The T-rod is arranged in a cross-shaped array along the circumference of the inner pipe. A T-groove for the T-rod to pass through is opened on the inner wall of the outer pipe. One end of the T-groove is closed, and one end of the T-groove passes through the end wall of the outer pipe. The connecting ring is fixedly connected to the end wall of the outer pipe passed through by the T-groove, and the connecting ring abuts against the end face of the T-rod.

[0006] By adopting the above technical scheme, firstly, the double-layer pipe structure can improve the overall structural strength of the direct-buried connecting pipe. Secondly, the T-rod and T-slot structure is adopted to realize the connection between the inner pipe and the outer pipe, and at the same time plays the role of reinforcing ribs, effectively increasing the structural strength of the direct-buried connecting pipe.

[0007] Optionally, a threaded ring is fixedly connected and coaxially arranged on the connecting ring, and an annular thread groove for embedding the threaded ring is opened on the end wall of the outer tube close to the connecting ring. After the threaded ring is threadedly connected in the annular thread groove, the connecting ring is welded to the outer tube.

[0008] By adopting the above technical solution, when connecting the inner tube and the outer tube, the T-bar is inserted into the T-slot from one end of the outer tube, and then the connecting ring is screwed so that the threaded ring is threadedly connected to the annular threaded groove. Only one end of the outer tube and the inner tube needs to be fixed, and the operation is simple and convenient. In addition, after the thread is fixed, it is convenient to position the welding operation, thereby facilitating the welding of the connecting ring and the outer tube. At the same time, two fixing methods, thread fixing and welding, are adopted to provide double protection, thereby improving the stability of the fixing of the outer tube and the inner tube.

[0009] Optionally, inner walls at both ends of the inner tube are provided with internal threads, and the internal threads are used for threaded connection with the direct buried heating pipes at both ends.

[0010] By adopting the above technical solution, the connection between the double-layer direct-buried connecting pipe and the heating direct-buried pipelines at both ends is facilitated.

[0011] Optionally, sealing rings are fixedly connected to the inner walls at both ends of the inner tube, and the internal threads at both ends are located between the sealing rings at both ends.

[0012] By adopting the above technical solution, the sealing ring can play a sealing role and prevent leakage.

[0013] In summary, the present application includes at least one of the following beneficial technical effects:

[0014] 1. First, the double-layer pipe structure can improve the overall structural strength of the direct-buried connecting pipe. Secondly, the T-bar and T-slot structure are used to connect the inner pipe and the outer pipe, and at the same time, it plays the role of reinforcing ribs, effectively increasing the structural strength of the direct-buried connecting pipe;

[0015] 2. When connecting the inner tube and the outer tube, insert the T-bar into the T-slot from one end of the outer tube, and then twist the connecting ring to make the threaded ring threadedly connected in the annular threaded groove. It is only necessary to fix one end of the outer tube and the inner tube, which is simple and convenient to operate. In addition, after the thread is fixed, it is convenient to position the welding operation, so as to facilitate the welding of the connecting ring and the outer tube. At the same time, two fixing methods, thread fixing and welding, are adopted, which provide double protection, thereby improving the stability of the fixing of the outer tube and the inner tube.

[0016] 3. The internal thread facilitates the connection between the double-layer direct-buried connecting pipe and the heating direct-buried pipes at both ends. The sealing ring can play a sealing role to prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a double-layer direct-buried connecting pipe in an embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of the structure used to show one end of the inner tube close to the connecting ring in the embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of the structure of the threaded ring used to illustrate the embodiment of the present application.

[0020] Figure 4 It is a schematic diagram of the structure used to display the inner tube in the embodiment of the present application.

[0021] Figure 5 It is a schematic diagram of the structure of the outer tube used to show the embodiment of the present application.

[0022] Explanation of the reference numerals: 1. inner tube; 2. outer tube; 3. connecting ring; 31. threaded ring; 32. annular threaded groove; 4. T-bar; 5. T-slot; 6. sealing ring. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-5 This application is described in further detail.

[0024] The present application embodiment discloses a double-layer direct buried connecting pipe. Figure 1-5 A double-layer direct-buried connecting pipe comprises an inner pipe 1, an outer pipe 2 and a connecting ring 3. The outer pipe 2 is sleeved on the outside of the inner pipe 1 and there is a gap between the outer pipe 2 and the inner pipe 1. A T-bar 4 is fixedly connected to the circumferential side wall of the inner pipe 1. The T-bar 4 is arranged in a cross-shaped array along the circumference of the inner pipe 1. A T-groove 5 for the T-bar 4 to pass through is opened on the inner wall of the outer pipe 2. One end of the T-groove 5 is closed, and one end of the T-groove 5 passes through the end wall of the outer pipe 2. The connecting ring 3 is fixedly connected to the end wall of the outer pipe 2 passed through by the T-groove 5, and the connecting ring 3 abuts against the end face of the T-bar 4.

[0025] Firstly, the double-layer pipe structure can improve the overall structural strength of the direct-buried connecting pipe. Secondly, the T-rod 4 and T-slot 5 structure are used to realize the connection between the inner pipe 1 and the outer pipe 2, and at the same time play the role of reinforcing ribs, effectively increasing the structural strength of the direct-buried connecting pipe.

[0026] A threaded ring 31 is fixedly connected and coaxially arranged on the connecting ring 3. An annular thread groove 32 for embedding the threaded ring 31 is provided on the end wall of the outer tube 2 near the connecting ring 3. After the threaded ring 31 is threadedly connected in the annular thread groove 32, the connecting ring 3 is welded to the outer tube 2. When connecting the inner tube 1 and the outer tube 2, the T-bar 4 is inserted into the T-groove 5 from one end of the outer tube 2, and then the connecting ring 3 is screwed to make the threaded ring 31 threadedly connected in the annular thread groove 32. Only one end of the outer tube 2 and the inner tube 1 needs to be fixed, and the operation is simple and convenient. In addition, after the thread is fixed, it is convenient to position the welding operation, so as to facilitate the welding of the connecting ring 3 and the outer tube 2. At the same time, two fixing methods, thread fixing and welding, are adopted, which provide double protection, thereby improving the stability of the fixing of the outer tube 2 and the inner tube 1.

[0027] Internal threads are provided on the inner walls at both ends of the inner tube 1. In the embodiment of the present application, the internal threads are not shown. The internal threads are used to be threadedly connected with the heating direct buried pipes at both ends, so as to facilitate the connection between the double-layer direct buried connecting pipe and the heating direct buried pipes at both ends. Sealing rings 6 are fixedly connected to the inner walls at both ends of the inner tube 1. The internal threads at both ends are located between the sealing rings 6 at both ends. The sealing rings 6 can play a sealing role to prevent leakage.

[0028] The implementation principle of a double-layer direct-buried connecting pipe in an embodiment of the present application is: when connecting the inner pipe 1 and the outer pipe 2, the T-rod 4 is inserted into the T-slot 5 from one end of the outer pipe 2, and then the connecting ring 3 is screwed to make the threaded ring 31 threadedly connected in the annular threaded groove 32. After the thread is fixed, the connecting ring 3 and the outer pipe 2 are welded, and the heating direct-buried pipes at both ends are threadedly connected to the two ends of the inner pipe 1.

[0029] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-layer direct buried connecting pipe, characterized in that: The invention comprises an inner tube (1), an outer tube (2) and a connecting ring (3); the outer tube (2) is sleeved on the outside of the inner tube (1) and is spaced apart from the inner tube (1); a T-shaped rod (4) is fixedly connected to the peripheral side wall of the inner tube (1); the T-shaped rods (4) are arranged in a cross-shaped array along the circumference of the inner tube (1); a T-shaped groove (5) for the T-shaped rod (4) to pass through is opened on the inner wall of the outer tube (2); one end of the T-shaped groove (5) is closed, and one end of the T-shaped groove (5) passes through the end wall of the outer tube (2); the connecting ring (3) is fixedly connected to the end wall of the outer tube (2) passed through by the T-shaped groove (5); the connecting ring (3) is in contact with the end surface of the T-shaped rod (4).

2. A double-layer direct buried connecting pipe according to claim 1, characterized in that: A threaded ring (31) is fixedly connected and coaxially arranged on the connecting ring (3); an annular threaded groove (32) for the threaded ring (31) to be embedded is provided on the end wall of the outer tube (2) close to the connecting ring (3); after the threaded ring (31) is threadedly connected in the annular threaded groove (32), the connecting ring (3) and the outer tube (2) are welded.

3. A double-layer direct buried connecting pipe according to claim 1, characterized in that: Internal threads are provided on the inner walls at both ends of the inner tube (1), and the internal threads are used for threaded connection with the direct buried heating pipes at both ends.

4. A double-layer direct-buried connecting pipe according to claim 3, characterized in that: Sealing rings (6) are fixedly connected to the inner walls at both ends of the inner tube (1), and the internal threads at both ends are located between the sealing rings (6) at both ends.

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