A sealing joint for a composite steel pipe connection

Abstract

The utility model relates to a sealing joint for composite steel pipe connection, including two connecting units, the connecting unit includes connecting cylinder, sealing ring and fastening ring, the connecting cylinder is cylindrical, the sealing ring sets up in the connecting cylinder, the sealing ring is coaxial with the connecting cylinder and sets up, the axial section of sealing ring is L type, the inner wall of one end of sealing ring and connecting cylinder is connected, the clearance is equipped between sealing ring and connecting cylinder, the annular sealing ring is equipped in the clearance, this sealing joint for composite steel pipe connection, through the cooperation of connecting cylinder and sealing ring, realize the head of the steel pipe of required connection and carry out the sealing package, realize the sealing connection of two connecting units through fastening connecting block to reach the purpose of stable sealing connection two composite steel pipes, and realize the nondestructive operation to the steel pipe inside.

Description

Technical Field

[0001] This utility model relates to a sealing joint for connecting composite steel pipes. Background Technology

[0002] In existing technologies, threaded connections are generally used to achieve the sealing connection of composite steel pipes. Although this connection method is simple, the sealing performance is not strong, the connection stability is relatively poor, and it is easy to damage the inner wall gasket. Utility Model Content

[0003] This utility model provides a sealing joint for connecting composite steel pipes.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a sealing joint for connecting composite steel pipes, comprising two connecting units, each connecting unit including a connecting cylinder, a sealing ring, and a fastening ring. The connecting cylinder is cylindrical, and the sealing ring is disposed inside the connecting cylinder. The sealing ring is coaxially arranged with the connecting cylinder, and the axial cross-section of the sealing ring is L-shaped. The sealing ring is connected to the inner wall of one end of the connecting cylinder, and a gap is provided between the sealing ring and the connecting cylinder. An annular sealing ring is disposed within the gap, and the sealing ring is coaxially arranged with the sealing cylinder. The cross-section of the sealing ring is L-shaped. The sealing ring and the sealing ring are matched in shape. The diameter of the outer wall of the connecting cylinder at the end away from the sealing ring gradually decreases from the end near the sealing ring to the end away from the sealing ring. The fastening ring is sleeved on the end of the connecting cylinder away from the sealing ring. The outer wall of the sealing ring at the end away from the sealing ring is provided with external threads. The inner wall of the fastening ring is inclined and is provided with internal threads. The fastening ring is threadedly connected to the connecting cylinder. The minimum inner diameter of the fastening ring is smaller than the maximum outer diameter of the connecting cylinder, and the maximum inner diameter of the fastening ring is larger than the maximum outer diameter of the connecting cylinder.

[0005] The outer circumferential ring of the end of the connecting cylinder with the sealing ring is provided with a plurality of connecting blocks evenly arranged. Each connecting block of the two connecting units is set in a one-to-one correspondence, and the corresponding two connecting blocks of the two connecting units are connected by bolts.

[0006] Preferably, a reinforcing ring is provided on the inner wall of the connecting cylinder.

[0007] Preferably, a washer is provided between the ends of the two connecting cylinders of the two connecting units.

[0008] Preferably, the axial cross-section of the reinforcing ring is a right triangle, and one of the right-angled sides of the right triangle cross-section is in contact with the inner wall of the connecting cylinder.

[0009] The beneficial effects of this utility model are that the sealing joint for connecting composite steel pipes achieves the sealing and wrapping of the head of the steel pipe to be connected through the cooperation of the connecting cylinder and the sealing ring, and then achieves the sealing connection of the two connecting units through the fastening connecting block, thereby achieving the purpose of stable sealing connection of two composite steel pipes, and realizing non-destructive operation on the inside of the steel pipe. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a structural schematic diagram of the sealing joint for connecting composite steel pipes according to this utility model.

[0012] Figure 2 This is a schematic diagram of the fastening ring of the sealing joint for connecting composite steel pipes according to this utility model;

[0013] Figure 3 yes Figure 1 Enlarged view of part A.

[0014] In the diagram: 1. Connecting cylinder, 2. Sealing ring, 3. Sealing ring, 4. Fastening ring, 5. Connecting block, 6. Reinforcing ring. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] like Figure 1-3 As shown, a sealing joint for connecting composite steel pipes includes two connecting units. Each connecting unit includes a connecting cylinder 1, a sealing ring 2, and a fastening ring 4. The connecting cylinder 1 is cylindrical, and the sealing ring 2 is disposed inside the connecting cylinder 1. The sealing ring 2 is coaxially arranged with the connecting cylinder 1, and its axial cross-section is L-shaped. The sealing ring 2 is connected to the inner wall of one end of the connecting cylinder 1, and a gap is provided between the sealing ring 2 and the connecting cylinder 1. An annular sealing ring 3 is disposed within the gap, and it is coaxially arranged with the sealing ring 2. The sealing ring 3 also has an L-shaped cross-section. The sealing ring 2 is shaped and matched. The diameter of the outer wall of the end of the connecting cylinder 1 away from the sealing ring 2 gradually decreases from the end near the sealing ring 2 to the end away from the sealing ring 2. The fastening ring 4 is sleeved on the end of the connecting cylinder 1 away from the sealing ring 2. The outer wall of the end of the sealing ring 2 away from the sealing ring 3 is provided with external threads. The inner wall of the fastening ring 4 is inclined and is provided with internal threads. The fastening ring 4 is threadedly connected to the connecting cylinder 1. The minimum inner diameter of the fastening ring 4 is smaller than the maximum outer diameter of the connecting cylinder 1, and the maximum inner diameter of the fastening ring 4 is larger than the maximum outer diameter of the connecting cylinder 1.

[0017] The outer circumference of the end of the connecting cylinder 1 with the sealing ring 2 is provided with a plurality of connecting blocks 5 evenly arranged. Each connecting block 5 of the two connecting units is arranged in a one-to-one correspondence, and the corresponding two connecting blocks of the two connecting units are connected by bolts.

[0018] Preferably, a reinforcing ring 6 is provided on the inner wall of the connecting cylinder 1.

[0019] Preferably, a washer is provided between the ends of the two connecting cylinders 1 of the two connecting units.

[0020] Preferably, the axial section of the reinforcing ring 6 is a right triangle, and one of the right-angled sides of the right triangle section is in contact with the inner wall of the connecting cylinder 1.

[0021] During installation, the connecting cylinder 1 and the fastening ring 4 are fitted onto the steel pipe. Then, the ends of the steel pipes to be connected are inserted into the two connecting units respectively, that is, the ends of the steel pipes are inserted into the gap between the sealing ring 2 and the connecting cylinder 1. The sealing ring 3 seals the ends of the steel pipes. Then, the fastening ring 4 is tightened, so that the fastening ring 4 compresses the outer wall of the connecting cylinder 1, making the inner wall of the connecting cylinder 1 firmly fit with the outer wall of the steel pipe, and achieving a stable and sealed connection. Then, the corresponding connecting blocks 6 on the two connecting cylinders 1 are connected and tightened with bolts, which can achieve a stable connection and good sealing performance.

[0022] Because the inside of the fastening ring 4 is inclined and matches the outer wall of the connecting cylinder 1, when the fastening ring 4 is tightened, the fastening ring 4 will gradually apply pressure to the connecting cylinder 1, so that its inner wall is tightly attached to the outer wall of the steel pipe. In fact, the inner diameter of the connecting cylinder 1 and the diameter of the sealing ring 2 are set according to the inner and outer diameters of the steel pipe to be connected. The reinforcing ring 6 is set on the inner wall of the connecting cylinder 1 mainly to improve the sealing effect. When the sealing ring 3 fails to seal, it can play a secondary sealing protection role and improve safety.

[0023] Compared with existing technologies, the sealing joint for connecting composite steel pipes achieves the sealing and wrapping of the head of the steel pipe to be connected through the cooperation of the connecting cylinder 1 and the sealing ring 2, and then achieves the sealing connection of the two connecting units through the fastening connecting block 5, thereby achieving the purpose of stable sealing connection of two composite steel pipes and realizing non-destructive operation on the inside of the steel pipe.

[0024] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sealing joint for connecting composite steel pipes, characterized in that, The device includes two connecting units, each comprising a connecting cylinder, a sealing ring, and a fastening ring. The connecting cylinder is cylindrical, and the sealing ring is disposed inside the connecting cylinder and coaxially with it. The sealing ring has an L-shaped axial cross-section and is connected to the inner wall of one end of the connecting cylinder. A gap exists between the sealing ring and the connecting cylinder, within which an annular sealing ring is disposed. The sealing ring is coaxially with the connecting cylinder and has an L-shaped cross-section, matching the shape of the sealing ring. The diameter of the outer wall of the connecting cylinder at the end furthest from the sealing ring gradually decreases from the end closest to the sealing ring towards the end furthest from it. The fastening ring is fitted onto the end of the connecting cylinder furthest from the sealing ring, and its outer wall at that end has external threads. The inner wall of the fastening ring is inclined and has internal threads. The fastening ring is threadedly connected to the connecting cylinder. The minimum inner diameter of the fastening ring is smaller than the maximum outer diameter of the connecting cylinder, and the maximum inner diameter of the fastening ring is larger than the maximum outer diameter of the connecting cylinder. The outer circumferential ring of the end of the connecting cylinder with the sealing ring is provided with a plurality of connecting blocks evenly arranged. Each connecting block of the two connecting units is set in a one-to-one correspondence, and the corresponding two connecting blocks of the two connecting units are connected by bolts.

2. The sealing joint for connecting composite steel pipes as described in claim 1, characterized in that, The inner wall of the connecting cylinder is provided with a reinforcing ring.

3. The sealing joint for connecting composite steel pipes as described in claim 1, characterized in that, A washer is provided between the ends of the two connecting cylinders of the two connecting units.

4. The sealing joint for connecting composite steel pipes as described in claim 2, characterized in that, The axial cross-section of the reinforcing ring is a right triangle, and one of the right-angled sides of the right triangle cross-section is in contact with the inner wall of the connecting cylinder.

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