Rotary compensator with sealing maintenance function

Abstract

A rotary compensator with a sealing maintenance function is used for compensating expansion caused by heat and contraction caused by cold of a pipeline and comprises an outer pipe (6) and an inner pipe (12), the inner pipe is inserted into the outer pipe, sealing filler (5) is arranged between the outer pipe and the inner pipe, the left end of the sealing filler is attached to a contraction wall (4) of the outer pipe, the right end of the sealing filler is pressed by a pressing sleeve (11), and a reducer pipe (3) is welded to the left end of the outer pipe in a sealed mode. A corrugated pipe (2) is hermetically welded on the reducer pipe, and a connecting pipe (1) connected with an external pipeline is hermetically welded at the left end of the corrugated pipe. Compared with the prior art, the utility model has the beneficial effects that after the sealing filler is abraded, the bolt is tightened again, the sealing filler can be compressed, the sealing performance is kept, and meanwhile, the problems that the radial pressure generated at one end, close to the pressing sleeve, of the sealing filler is overlarge and the abrasion of the sealing filler is sharply increased are avoided; and the service life of the rotary compensator is prolonged.

Description

Technical Field

[0001] The utility model relates to a rotary compensator for compensating the thermal expansion and contraction of pipelines. Background Art

[0002] The rotary compensator includes an outer pipe, an inner pipe, and a gland. The inner pipe is inserted into the outer pipe. A sealing packing is arranged between the inner pipe and the outer pipe. The sealing packing is an integral body and is compressed by the gland. The gland is screwed onto the outer pipe through bolts. When the bolts are tightened, the gland compresses the sealing packing to generate a radial pressure, and the sealing packing expands to achieve the sealing between the outer pipe and the inner pipe. When the pipeline expands and contracts thermally, relative rotation occurs between the outer pipe and the inner pipe of the rotary compensator to compensate for the thermal expansion and contraction of the pipeline.

[0003] Its disadvantage is that after the sealing packing wears, by tightening the bolts again, the sealing performance cannot be effectively improved. The reason is that the outer pipe is fixed on the pipeline, the radial pressure generated at one end of the sealing packing close to the gland is the largest, and the radial pressure generated at the end of the sealing packing far from the gland is the smallest. To make the radial pressure at the end far from the gland greater than the pressure of the leakage medium along the leakage channel, it is necessary to increase the pressing force of the gland, but the wear at the end of the sealing packing close to the gland will increase sharply, resulting in a rapid decline in the sealing performance. Summary of the Utility Model

[0004] In view of the above problems, the utility model provides a rotary compensator with a sealing maintenance function, and its function is to effectively maintain the sealing performance when the sealing packing wears.

[0005] The technical solution of the utility model is a rotary compensator with a sealing maintenance function, which includes an outer pipe 6 and an inner pipe 12. The inner pipe is inserted into the outer pipe. A sealing packing 5 is arranged between the outer pipe and the inner pipe. The left end of the sealing packing is in contact with the shrinking wall 4 of the outer pipe, and the right end of the sealing packing is in contact with the gland 11. The gland flange 8 of the gland is connected to the outer pipe flange 7 of the outer pipe through bolts 10. Its feature is that a reducing pipe 3 is hermetically welded to the left end of the outer pipe, a corrugated pipe 2 is hermetically welded to the reducing pipe, and a connecting pipe 1 connected to the external pipeline is hermetically welded to the left end of the corrugated pipe.

[0006] The feature of the utility model is that after the rotary compensator is connected to the external pipeline, due to the setting of the corrugated pipe, the corrugated pipe can axially expand and contract. When the bolts are tightened, the shrinking wall 4 and the gland can apply pressure to the sealing packing in opposite directions to clamp the sealing packing. In this way, the radial pressure generated at one end of the sealing packing close to the gland is basically equal to the radial pressure generated at the end of the sealing packing far from the gland.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows: when the sealing packing is worn, the bolt is tightened again, the sealing packing can be pressed tightly to maintain the sealing performance. At the same time, the radial pressure generated at one end of the sealing packing close to the gland is avoided from being too large, the problem of sharp increase in wear of the sealing packing is avoided, and the service life of the rotary compensator is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic structural diagram of the utility model.

[0009] The reference signs in the drawings are: 1 - connecting pipe, 2 - corrugated pipe, 3 - reducing pipe, 4 - shrinkage wall, 5 - sealing packing, 6 - outer pipe, 7 - outer pipe flange, 8 - gland flange, 9 - spring, 10 - bolt, 11 - gland, 12 - inner pipe, 13 - nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] A rotary compensator with a sealing maintenance function includes an outer pipe 6 and an inner pipe 12. The inner pipe is inserted into the outer pipe, and the right end of the inner pipe protrudes from the outer pipe. A sealing packing 5 is provided between the outer pipe and the inner pipe. The left end of the sealing packing is in contact with the shrinkage wall 4 (i.e., the flange extending inward from the outer pipe) of the outer pipe, and the right end of the sealing packing is in contact with the gland 11. The gland flange 8 of the gland is connected to the outer pipe flange 7 of the outer pipe through a bolt 10. Tightening the bolt can press the sealing packing tightly.

[0011] A reducing pipe 3 is hermetically welded to the left end of the outer pipe. The diameter of the right end of the reducing pipe is large, and the diameter of the left end of the reducing pipe is small. A corrugated pipe 2 is hermetically welded to the reducing pipe, and a connecting pipe 1 connected to an external pipeline is hermetically welded to the left end of the corrugated pipe.

[0012] During use, the connecting pipe is hermetically connected to a cross-section of the pipeline, and the right end of the inner pipe is hermetically connected to another cross-section of the pipeline. When the pipeline expands and contracts thermally, the outer pipe and the inner pipe can rotate relative to each other to compensate for the thermal expansion and contraction of the pipeline.

[0013] When the sealing performance of the rotary compensator decreases, the bolt is tightened again to maintain the sealing performance.

[0014] A spring 9 is sleeved on the bolt. The spring is located between the right side of the gland flange 8 and the nut 13 on the bolt. When the bolt is tightened, the spring stores energy. When the sealing packing is worn, the spring releases energy to automatically clamp the sealing packing, which can reduce the workload of manual maintenance.

[0015] The number of corrugations of the corrugated pipe can be determined according to the compression amount of the sealing packing. When the compression amount is large, the number of corrugations increases accordingly, generally 1 - 2. In this embodiment, 1 is adopted.

Claims

1. A rotary compensator with a sealing maintenance function, which comprises an outer tube (6) and an inner tube (12). The inner tube is inserted into the outer tube, and a sealing packing (5) is arranged between the outer tube and the inner tube. The left end of the sealing packing is in contact with the shrinkage wall (4) of the outer tube, and the right end of the sealing packing is in contact with a gland (11). The gland flange (8) of the gland is connected to the outer tube flange (7) of the outer tube by bolts (10). It is characterized in that, The left end of the outer pipe is sealed and welded with a reducing pipe (3), the reducing pipe is sealed and welded with a corrugated pipe (2), and the left end of the corrugated pipe is sealed and welded with a connecting pipe (1) connected to the external pipe.

2. The rotating compensator with a sealing maintenance function according to claim 1, characterized in that, A spring (9) is sleeved on the bolt, and the spring is located between the nut (13) on the bolt and the right side of the gland flange (8).

3. The rotating compensator with a sealing maintenance function according to claim 1, characterized in that, The number of corrugations of the corrugated pipe (2) is 1.

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