Self-sealing sleeve compensator

Abstract

A self-sealing sleeve compensator is used for compensating thermal expansion and cold contraction of a pipeline. The utility model relates to a corrugated pipe, which comprises an outer pipe (6) and an inner pipe (13), the inner pipe is inserted in the outer pipe, a sealing filler (12) is arranged between the outer pipe and the inner pipe, and the right end of the sealing filler is attached to a pressing sleeve (11), and is characterized in that the left end of the outer pipe is provided with an inward contraction flange (2), a corrugated pipe (4) is arranged between the flange and the sealing filler, and the left side surface of the corrugated pipe is fixedly connected to the flange through a first annular plate (3); the right side face of the corrugated pipe is fixedly connected with a second annular plate (5), and the right side face of the second annular plate is attached to the sealing filler. Compared with the prior art, the corrugated pipe has the advantages that after the sealing filler is abraded, the corrugated pipe can automatically press the sealing filler, and the sealing performance is kept; the pressure of the corrugated pipe on the sealing filler can change along with the pressure change of fluid in the pipeline, so that the pre-pressure of the sealing filler can be reduced, the abrasion of the sealing filler is reduced, and the service life of the sleeve compensator is prolonged.

Description

Technical Field

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

[0002] The sleeve 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. By tightening the bolts, the gland compresses the sealing packing to generate a radial pressure, causing the sealing packing to expand and achieving the seal between the outer pipe and the inner pipe. When the pipeline expands or contracts thermally, relative movement occurs between the outer pipe and the inner pipe of the sleeve compensator to compensate for the thermal expansion and contraction of the pipeline.

[0003] Its disadvantage is that after the sealing packing is worn, by tightening the bolts again, the sealing performance cannot be effectively improved. The reason is that the outer pipe is fixed on the pipeline, and the gland generates the maximum radial pressure on one end of the sealing packing close to the gland, while the minimum radial pressure is generated on the end of the sealing packing far from the gland. 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, and the sealing packing will become loose, 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 self-sealing sleeve compensator, which can automatically compensate for the wear of the sealing packing and reduce the manual maintenance workload when the sealing packing is worn.

[0005] The technical solution of the utility model is a self-sealing sleeve compensator, which includes an outer pipe 6 and an inner pipe 13. The inner pipe is inserted into the outer pipe. A sealing packing 12 is arranged between the outer pipe and the inner pipe. The right end of the sealing packing is in contact with the gland 11. The feature is that the left end of the outer pipe has an inwardly shrinking flange 2. A corrugated pipe 4 is arranged between the flange and the sealing packing. The left side surface of the corrugated pipe is fixedly connected to the flange through a first ring plate 3. The contact surface between the first ring plate and the corrugated pipe fits each other. The right side surface of the corrugated pipe is fixedly connected to a second ring plate 5. The contact surface between the second ring plate and the corrugated pipe fits each other. The right side surface of the second ring plate is in contact with the sealing packing. The gland flange 8 of the gland is connected to the outer pipe flange 7 of the outer pipe through bolts 10.

[0006] The utility model is characterized in that the corrugated pipe has elasticity. When the sealing packing is worn, the elastic force of the corrugated pipe can automatically press the sealing packing tightly. In addition, the fluid in the pipeline will fill the inner cavity of the corrugated pipe. The pressure of the corrugated pipe on the sealing packing can increase or decrease with the increase or decrease of the pipeline pressure, so that the radial pressure of the sealing packing is always greater than the pressure of the leakage medium along the leakage channel, effectively maintaining the sealing performance of the sleeve compensator.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows: when the sealing packing is worn, the corrugated pipe can automatically seal and press the packing to maintain the sealing performance; the pressure of the corrugated pipe on the sealing packing can change with the pressure of the fluid in the pipeline, which can reduce the pre-pressure of the sealing packing, reduce the wear of the sealing packing, and improve the service life of the sleeve compensator. Brief Description of the Drawings

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

[0009] The reference signs in the drawings are: 1 - connecting pipe, 2 - flange, 3 - first ring plate, 4 - corrugated pipe, 5 - second ring plate, 6 - outer pipe, 7 - outer pipe flange, 8 - gland flange, 9 - spring, 10 - bolt, 11 - gland, 12 - sealing packing, 13 - inner pipe, 14 - nut. [[ID= 11]]Detailed Description of the Preferred Embodiment

[0010] A self-sealing sleeve compensator includes an outer pipe 6 and an inner pipe 13. The inner pipe is inserted into the outer pipe, and the right end of the inner pipe protrudes from the outer pipe. The left end of the outer pipe is sealed and welded with a connecting pipe 1. The connecting pipe is of a stepped structure, with its left end being a small head, and the diameter of the small head end is equal to the diameter of the inner pipe.

[0011] A sealing packing 12 is provided between the outer pipe and the inner pipe. The right end of the sealing packing is in contact with a gland 11. The gland is sleeved on the inner pipe, and the head of the gland extends into the outer pipe. The left end of the outer pipe has an inwardly shrinking flange 2. A corrugated pipe 4 is provided between the flange and the sealing packing. The corrugated pipe is sleeved on the inner pipe. The left side surface of the corrugated pipe is fixedly connected to the flange through a first ring plate 3. The contact surface between the first ring plate and the corrugated pipe fits each other. The right side surface of the corrugated pipe is fixedly connected with a second ring plate 5. The contact surface between the second ring plate and the corrugated pipe fits each other. The right side surface of the second ring plate is in contact with the sealing packing.

[0012] The gland flange 8 of the gland is connected to the outer pipe flange 7 of the outer pipe through bolts 10. Tightening the bolts can press the sealing packing tightly.

[0013] The self-sealing principle is as follows: after the sealing packing is pressed tightly by the gland, the corrugated pipe will contract. When the sealing packing is worn, the corrugated pipe will elongate, and the elastic force of the corrugated pipe can automatically press the sealing packing tightly. In addition, there is a gap between the inner pipe and the flange. The fluid in the pipeline passes through this gap and enters the inner cavity of the corrugated pipe, making the corrugated pipe have an axial tension. In this way, the pressure of the corrugated pipe on the sealing packing can increase or decrease with the increase or decrease of the pipeline pressure, so that the radial pressure of the sealing packing is always greater than the pressure of the leakage medium along the leakage channel, effectively maintaining the sealing performance of the sleeve compensator.

[0014] When the sealing packing wears out, the bellows can automatically seal and compress the packing to maintain the sealing performance; the pressure of the bellows on the sealing packing can change with the pressure of the fluid in the pipeline, which can reduce the pre-pressure of the sealing packing, reduce the wear of the sealing packing, and improve the service life of the sleeve compensator.

[0015] 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, relative movement can occur between the outer pipe and the inner pipe to compensate for the thermal expansion and contraction of the pipeline.

[0016] A spring 9 is sleeved on the bolt, and the spring is located between the right side of the gland flange 8 and the nut 14 on the bolt. When the bolt is tightened, the spring stores energy. When the sealing packing wears out, the spring releases energy to automatically compress the sealing packing, which can further improve the sealing effect.

Claims

1. Self-sealing sleeve compensator, which comprises an outer pipe (6) and an inner pipe (13). The inner pipe is inserted into the outer pipe, and a sealing packing (12) is arranged between the outer pipe and the inner pipe. The right end of the sealing packing is in contact with a gland (11). It is characterized in that, The left end of the outer pipe has an inwardly contracting flange (2). A bellows (4) is provided between the flange and the sealing packing. The left side surface of the bellows is fixedly connected to the flange through a first ring plate (3). The contact surface between the first ring plate and the bellows fits each other. The right side surface of the bellows is fixedly connected with a second ring plate (5). The contact surface between the second ring plate and the bellows fits each other. The right side surface of the second ring plate is in contact with the sealing packing. The gland flange (8) of the gland is connected to the outer pipe flange (7) of the outer pipe through bolts (10).

2. The self-sealing sleeve compensator according to claim 1, characterized in that, A spring (9) is sleeved on the bolt. The spring is located between the right side of the gland flange (8) and the nut (14) on the bolt.

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