Rotary compensator
By adopting a multi-stage filler and ring body combination structure in the rotary compensator, the radial pressure of the sealing filler is consistent with the pressure distribution of the leakage medium, solving the problem of degraded sealing performance and extending the service life of the rotary compensator.
Patent Information
- Application Number
- CN202422372988.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-28
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-28
AI Technical Summary
The radial pressure distribution of the sealing filler of existing rotary compensators is uneven, resulting in a decrease in sealing performance and shortening service life.
The combination structure of multiple small-segment packing and metal ring body is adopted. After the sealing packing is pressed by the press sleeve, the outer diameter of the right end generates the maximum radial pressure, and the outer diameter of the left end generates the minimum radial pressure. The ring body moves simultaneously uniformly and the axial pressure, and the pressure distribution of the sealing packing is consistent with the pressure distribution of the leakage medium.
Improves the sealing effect and improves the service life of the rotary compensator.
Smart Images
Figure CN223178392U_ABST
Abstract
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, and a sealing packing is arranged between the inner pipe and the outer pipe. The sealing packing is an integral body, and the sealing packing is compressed by the gland to generate a radial pressure, and the sealing packing expands to achieve the seal between the outer pipe and the inner pipe. However, the radial pressure in the length direction of the sealing packing is inconsistent. The radial pressure at the part close to the gland is the largest, and the radial pressure at the part far from the gland is the smallest, which is opposite to the pressure distribution of the leakage medium along the leakage channel (the pressure of the leakage medium is the smallest at the part far from the gland), resulting in a low sealing effect, a rapid decline in the sealing performance, and a reduction in the service life of the rotary compensator. Summary of the Utility Model
[0003] In view of the above problems, the utility model provides a rotary compensator, in which the radial pressure distribution of the sealing packing is basically consistent with the pressure distribution of the leakage medium along the leakage channel, which can improve the sealing effect and extend the service life of the rotary compensator.
[0004] The technical solution of the utility model is a rotary compensator, which includes an outer pipe 7 and an inner pipe 1. The inner pipe is inserted into the outer pipe, and a sealing packing is arranged between the outer pipe and the inner pipe. The right end of the sealing packing is in contact with the neck 9 of the outer pipe, and the left end of the sealing packing is compressed by a gland 5. The flange of the gland is connected to the flange of the outer pipe. The feature is that the sealing packing is formed by combining a plurality of small sections of packing 8. The outer diameter of the small section of packing at the left end is the largest, and the outer diameter of the small section of packing at the right end is the smallest. A ring body 4 made of a metal material is arranged between adjacent small sections of packing. The outer circle of the ring body is a variable diameter structure. The outer diameter of the left part of the ring body is larger than the outer diameter of its right part. The outer diameter of the right part of the ring body is equal to the outer diameter of the adjacent small section of packing on the right. The outer diameter of the left part of the ring body is smaller than the outer diameter of the adjacent small section of packing on the left. The inner wall of the outer pipe is in contact with each small section of packing and each ring body.
[0005] The feature of the utility model is that after the sealing packing is compressed by the gland, the outer diameter of the small section of packing at the right end is the smallest, and the radial pressure generated by it is the largest. The outer diameter of the small section of packing at the left end is the largest, and the radial pressure generated by it is small. The pressure distribution of the sealing packing is basically consistent with the pressure distribution of the leakage medium along the leakage channel.
[0006] During the compression process, the vertical surface of the step on the inner wall of the outer pipe drives each ring body to move synchronously, and the ring body presses the small section of packing, so that the axial pressure on each small section of packing is equal.
[0007] The beneficial effect of the utility model is that the radial pressure distribution of the sealing packing along the inner pipe is basically consistent with the pressure distribution of the leakage medium along the leakage channel, which can improve the sealing effect and extend the service life of the rotary compensator. Description of the Drawings
[0008] Figure 1 This is a schematic structural view of the present utility model.
[0009] The reference signs in the drawings are: 1 - inner pipe, 2 - anti - withdrawal ring, 3 - pressing plate, 4 - ring body, 5 - pressing sleeve, 6 - outer pipe flange, 7 - outer pipe, 8 - small section of packing, 9 - neck, 10 - bolt. Detailed Description of the Invention
[0010] A rotary compensator includes an outer pipe 7 and an inner pipe 1. The inner pipe is inserted into the outer pipe. The right end of the outer pipe is constricted to form a neck 9, and a connecting pipe 10 is hermetically welded to the neck. A sealing packing is provided between the outer pipe and the inner pipe. The right end of the sealing packing abuts against the neck 9 of the outer pipe, and the left end of the sealing packing is pressed tightly by a pressing sleeve 5. The flange of the pressing sleeve is connected to the outer pipe flange 6 of the outer pipe by bolts 11.
[0011] The sealing packing is formed by combining a plurality of small sections of packing 8. The small sections of packing are pre - pressed from flexible graphite material. The outer diameter of the left - most small section of packing is the largest, and the outer diameter of the right - most small section of packing is the smallest. A ring body 4 made of metal material is provided between adjacent small sections of packing. The outer circle of the ring body has a stepped diameter structure. The outer diameter of the left part of the ring body is larger than that of its right part. The outer diameter of the right part of the ring body is equal to the outer diameter of the adjacent small section of packing on the right, and the outer diameter of the left part of the ring body is smaller than the outer diameter of the adjacent small section of packing on the left. The inner wall of the outer pipe is stepped, and the inner wall of the outer pipe fits with each small section of packing and each ring body.
[0012] When the bolts are tightened, the pressing sleeve presses the sealing packing. The outer diameter of the right - most small section of packing is the smallest, and the radial pressure generated by it is the largest. The outer diameter of the left - most small section of packing is the largest, and the radial pressure generated by it is the smallest. The pressure distribution of the sealing packing is basically the same as the pressure distribution of the leakage medium along the leakage channel.
[0013] During the pressing process, the vertical surface of the step on the inner wall of the outer pipe drives each ring body to move synchronously, and each ring body presses the small sections of packing, so that the axial pressures on each small section of packing are equal.
[0014] To prevent large axial displacement between the inner pipe and the outer pipe caused by external forces, such as the inner pipe slipping out of the outer pipe or the inner pipe slipping out from between the sealing packing, a ring - shaped pressing plate 3 is provided between the pressing sleeve and the sealing packing. A anti - withdrawal ring 2 is welded to the left part of the inner pipe. The anti - withdrawal ring is located on the left side of the pressing plate 3. The inner wall of the pressing sleeve has a step. The inner diameter of the right part of the pressing sleeve is larger than the outer diameter of the anti - withdrawal ring, and the inner diameter of the left part of the pressing sleeve is smaller than the outer diameter of the anti - withdrawal ring.
Claims
1. A rotary compensator, comprising an outer tube (7) and an inner tube (1), the inner tube being inserted into the outer tube, a sealing packing being provided between the outer tube and the inner tube, the right end of the sealing packing being in contact with the neck (9) of the outer tube, the left end of the sealing packing being pressed by a gland (5), the flange of the gland being connected to the flange of the outer tube, characterized in that, The sealing packing is formed by combining a plurality of small sections of packing (8). The outer diameter of the small section of packing at the left end is the largest, and the outer diameter of the small section of packing at the right end is the smallest. A ring body (4) made of a metal material is provided between adjacent small sections of packing. The outer circle of the ring body has a stepped structure. The outer diameter of the left part of the ring body (4) is greater than the outer diameter of its right part. The outer diameter of the right part of the ring body (4) is equal to the outer diameter of the adjacent small section of packing on the right. The outer diameter of the left part of the ring body is smaller than the outer diameter of the adjacent small section of packing on the left. The inner wall of the outer tube fits with each small section of packing and each ring body.
2. The rotary compensator according to claim 1, characterized in that, A ring-shaped pressing plate (3) is provided between the compression sleeve (5) and the sealing packing. A retaining ring (2) is welded to the left part of the inner tube. The retaining ring is located on the left side of the pressing plate (3). The inner diameter of the right part of the compression sleeve is greater than the outer diameter of the retaining ring. The inner diameter of the left part of the compression sleeve is smaller than the outer diameter of the retaining ring.