A pipe fitting expansion device

Abstract

This utility model provides a pipe connection expansion and tightening device, including a first pair of connecting pipes, an expansion cylinder, and an annular expansion block. A cylindrical groove is formed on the inner side of the expansion cylinder, and a sealing rubber cylinder is fixed inside the groove. The first pair of connecting pipes and a second pair of connecting pipes are horizontally inserted inside the expansion cylinder. A conical reinforcing sleeve is fitted around the outside of the expansion cylinder. An annular fixing plate is longitudinally fixed to the right end of the outside of the expansion cylinder, and multiple threaded grooves are formed on the right end of the annular fixing plate. A rubber ring is slidably fitted around the outside of the second pair of connecting pipes, and a movable ring is longitudinally fixed to the outside of the rubber ring. Multiple high-strength bolts are threaded into the right end of the movable ring. This design solves the problem that in the original device, the expansion mechanism is located inside the pipe, which affects the flow of liquid inside the pipe and is prone to corrosion damage. This utility model designs a multi-point screw-type expansion and tightening structure, which can achieve expansion and tightening connection between two pipes with good sealing performance and does not affect the flow of liquid inside the pipe.

Description

Technical Field

[0001] This utility model is a pipe fitting expansion and tightening device, belonging to the field of pipe fitting technology. Background Technology

[0002] With the development of modern industry, the requirements for the safety and efficiency of pipeline connections are becoming increasingly stringent. While traditional welding methods can provide strong connection forces, the process is complex, time-consuming, and difficult to modify once completed. To meet the demands for rapid market response and improved construction flexibility, expansion joint devices have emerged. These devices can quickly achieve reliable connections between pipelines without damaging the original structure, reducing downtime and maintenance costs.

[0003] Publication number CN105909634A discloses a pipe-connecting expansion and tightening device. This device includes an expansion and tightening mechanism that connects two pipes at both ends; a supporting mechanism for controlling the expansion and contraction of the expansion and tightening mechanism; and a displacement mechanism for driving the supporting mechanism. The expansion and tightening mechanism is located inside the two pipes. Rotating the displacement mechanism inward causes the supporting mechanism to expand outward, thus expanding and tightening the expansion and tightening mechanism against the inner wall of the pipe. However, since the expansion and tightening mechanism is located inside the pipe, it affects the flow of liquid within the pipe. Furthermore, when transporting corrosive liquids, the expansion and tightening mechanism is prone to corrosion and damage, affecting subsequent use. Therefore, there is an urgent need for a pipe-connecting expansion and tightening device to address these problems. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pipe connection expansion device to solve the problems mentioned in the background technology. This utility model designs a multi-point twisting expansion structure, which can realize the expansion connection between two pipes, and the connection has good sealing performance and will not affect the flow of liquid inside the pipe.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pipe fitting expansion and tightening device, comprising a first pair of connecting pipes, an expansion cylinder, and an annular expansion block. The expansion cylinder has a cylindrical groove on its inner side, and a sealing rubber cylinder is fixed inside the cylindrical groove. A first pair of connecting pipes and a second pair of connecting pipes are horizontally inserted inside the expansion cylinder. A conical reinforcing sleeve is fitted over the expansion cylinder. An annular fixing plate is longitudinally fixed to the right end of the expansion cylinder, and multiple threaded grooves are formed at the right end of the annular fixing plate. A rubber ring is slidably fitted over the second pair of connecting pipes, and a movable ring is longitudinally fixed to the outside of the rubber ring. Multiple high-strength bolts are threaded into the right end of the movable ring. An annular expansion groove is formed at the right end of the expansion cylinder, and an adjusting groove is formed inside the right end of the annular expansion groove. An annular expansion block is slidably inserted into the right end of the adjusting groove, and a high-strength connecting pipe is fixed to the right end of the annular expansion block.

[0006] Furthermore, the left ends of the first pair of connectors abut against the left ends of the second pair of connectors, and the gap at the connection between the left ends of the first pair of connectors and the second pair of connectors is inside the sealing rubber cylinder.

[0007] Furthermore, the left ends of the multiple high-strength bolts are respectively screwed into multiple thread grooves.

[0008] Furthermore, the right end of the high-strength connecting pipe abuts against the moving ring.

[0009] Furthermore, the right end of the conical reinforcing sleeve abuts against the annular fixing piece.

[0010] Furthermore, the left end of the expansion cylinder is filled with sealant at the connection point with the first pair of connecting pipes.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a pipe connection expansion and tightening device. Because this utility model adds an expansion cylinder, a conical reinforcing sleeve, an annular fixing plate, a high-strength bolt, a moving ring, a rubber ring, an annular expansion groove, an annular expansion block, a high-strength connecting pipe, and a sealing rubber cylinder, our design improvements and actual use have shown that this device has a reasonable structure and good practicality. The design of a multi-point screwing expansion and tightening structure can realize the expansion and tightening connection between two pipes, and the connection has good sealing performance and will not affect the flow of liquid inside the pipe. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a pipe-connecting expansion and tightening device according to the present invention;

[0014] Figure 2 This is a cross-sectional schematic diagram of a pipe fitting and tightening device according to the present invention;

[0015] Figure 3 This is a schematic diagram of the disassembly of the annular expansion block of the pipe connection expansion device of this utility model.

[0016] In the diagram: 1-First pair of connecting pipes, 2-Second pair of connecting pipes, 3-Expansion sleeve, 4-Conical reinforcing sleeve, 5-Annular fixing plate, 6-Threaded groove, 7-High-strength bolt, 8-Moving ring, 9-Rubber ring, 10-Annular expansion groove, 11-Adjusting groove, 12-High-strength connecting pipe, 13-Annular expansion block, 14-Cylindrical groove, 15-Sealing rubber cylinder. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1-3 This utility model provides a technical solution: a pipe fitting expansion and tightening device, including a first pair of connecting pipes 1, an expansion cylinder 3, and an annular expansion block 13. A cylindrical groove 14 is formed on the inner side of the expansion cylinder 3, and a sealing rubber cylinder 15 is fixed inside the cylindrical groove 14. The first pair of connecting pipes 1 and the second pair of connecting pipes 2 are horizontally inserted inside the expansion cylinder 3. A conical reinforcing sleeve 4 is fitted around the outside of the expansion cylinder 3. An annular fixing plate 5 is longitudinally fixed at the right end of the outside of the expansion cylinder 3, and multiple threaded grooves 6 are formed at the right end of the annular fixing plate 5. A rubber sleeve is slidably fitted around the outside of the second pair of connecting pipes 2. The outer side of the rubber ring 9 is longitudinally fixed with a movable ring 8. Multiple high-strength bolts 7 are threaded into the right end of the movable ring 8. The right end of the expansion cylinder 3 has an annular expansion groove 10. The right end of the annular expansion groove 10 has an adjustment groove 11. The right end of the adjustment groove 11 has an annular expansion block 13 slidably inserted. The right end of the annular expansion block 13 is fixed with a high-strength connecting pipe 12. This design solves the problem that in the original device, the expansion mechanism was set inside the pipe, which would affect the flow of liquid inside the pipe and make it prone to corrosion and damage.

[0019] As the first embodiment of this utility model: the left ends of the first pair of connecting tubes 1 and the second pair of connecting tubes 2 abut against each other, and the gap at the connection between the left ends of the first pair of connecting tubes 1 and the second pair of connecting tubes 2 is inside the sealing rubber cylinder 15. By adding the sealing rubber cylinder 15, the gap at the connection between the left ends of the first pair of connecting tubes 1 and the second pair of connecting tubes 2 can be prevented from directly contacting the inner wall of the expansion cylinder 3.

[0020] Multiple high-strength bolts 7 have their left ends screwed into multiple threaded grooves 6, and the right end of the high-strength connecting pipe 12 abuts against the moving ring 8. By screwing the left ends of the multiple high-strength bolts 7 into the multiple threaded grooves 6, the longitudinal stability of the moving ring 8 can be ensured, and it is also convenient for it to apply thrust to the high-strength connecting pipe 12 and the annular expansion block 13. The right end of the conical reinforcing sleeve 4 abuts against the annular fixing plate 5, and the connection between the left end of the expansion cylinder 3 and the first connecting pipe 1 is filled with sealant. By filling the connection between the left end of the expansion cylinder 3 and the first connecting pipe 1 with sealant, leakage at the connection between the left end of the expansion cylinder 3 and the first connecting pipe 1 can be prevented.

[0021] As a second embodiment of this utility model: when it is necessary to connect the first pair of connecting pipes 1 and the second pair of connecting pipes 2, the first pair of connecting pipes 1 and the second pair of connecting pipes 2 are directly inserted into the left and right ends of the expansion cylinder 3 respectively, so that the left ends of the first pair of connecting pipes 1 and the second pair of connecting pipes 2 abut against each other, and the gap at the connection of the left ends of the first pair of connecting pipes 1 and the second pair of connecting pipes 2 is inside the sealing rubber cylinder 15. Then, multiple high-strength bolts 7 are tightened in sequence using an external wrench. The moving ring 8 can be driven to move to the left by the thread principle, which will push the high-strength connecting pipe 12 to the left. The high-strength connecting pipe 12 will also drive the annular expansion block 13 to move to the left in the adjusting groove 11. At this time, the annular expansion groove 10 will be slightly deformed and force the inner wall of the expansion cylinder 3 to expand, thereby applying an expansion force to the sealing rubber cylinder 15, forcing the sealing rubber cylinder 15 to fit tightly against the connection of the first pair of connecting pipes 1 and the second pair of connecting pipes 2.

[0022] 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.

[0023] 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 pipe butt expansion device comprising a first butt pipe (1), an expansion cylinder (3) and an annular expansion block (13), characterized in that: The inner side of the expansion cylinder (3) is provided with a cylindrical groove (14), and a sealing rubber cylinder (15) is fixed in the cylindrical groove (14). A first pair of connecting pipes (1) and a second pair of connecting pipes (2) are horizontally inserted in the expansion cylinder (3). The expansion cylinder (3) is fitted with a conical reinforcing sleeve (4). An annular fixing plate (5) is longitudinally fixed at the right end of the expansion cylinder (3). Multiple threaded grooves (6) are opened at the right end of the annular fixing plate (5). A rubber ring (9) is slidably fitted on the outside of the second connecting pipe (2). A movable ring (8) is longitudinally fixed on the outside of the rubber ring (9). Multiple high-strength bolts (7) are threaded into the right end of the movable ring (8). An annular expansion groove (10) is opened at the right end of the expansion cylinder (3). An adjusting groove (11) is opened at the right end of the annular expansion groove (10). An annular expansion block (13) is slidably inserted into the right end of the adjusting groove (11). A high-strength connecting pipe (12) is fixed at the right end of the annular expansion block (13).

2. A pipe butt expansion device according to claim 1, wherein: The left ends of the first pair of connectors (1) and the second pair of connectors (2) abut against each other, and the gap at the connection between the left ends of the first pair of connectors (1) and the second pair of connectors (2) is inside the sealing rubber cylinder (15).

3. A pipe butt expansion device according to claim 1, wherein: The left ends of the multiple high-strength bolts (7) are respectively screwed into multiple thread grooves (6).

4. A pipe butt expansion device according to claim 1, wherein: The right end of the high-strength connecting pipe (12) abuts against the moving ring (8).

5. A pipe butt expansion device according to claim 1, wherein: The right end of the conical reinforcing sleeve (4) abuts against the annular fixing piece (5).

6. A pipe butt expansion device according to claim 1, wherein: The left end of the expansion cylinder (3) is filled with sealant at the connection between it and the first connecting pipe (1).

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