Sealing assembly of coiled pipe of superheater

Abstract

The utility model discloses a sealing assembly of a coiled pipe of a superheater, which relates to the technical field of the structure of the sealing assembly, and comprises a sealing ring sleeved outside a straight pipe of the coiled pipe and embedded in a step hole of a cover plate, a thread bushing is arranged right above the sealing ring, and the thread bushing is sleeved outside the straight pipe of the coiled pipe and embedded in the step hole of the cover plate. The straight pipe is sleeved with a center hole of the threaded sleeve, and the threaded sleeve is fixedly arranged on the top surface of a cover plate of the superheater. The outer cylindrical surface of the threaded sleeve is provided with an external thread arranged in the axial direction of the threaded sleeve, the external thread is in threaded connection with a pressing sleeve, an inner cavity of the pressing sleeve is arranged outside the straight pipe in a sleeving mode, a plurality of rod pieces are welded to the bottom surface of the inner cavity of the pressing sleeve, and an annular plate arranged outside the straight pipe in a sleeving mode is welded between the bottom surfaces of the rod pieces. The utility model has the beneficial effects that the working intensity of workers is reduced, and the use cost of the superheater is saved.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing component structure, and in particular to a sealing component for a serpentine tube of a superheater. Background Technology

[0002] The function of a superheater is to use the hot flue gas discharged from the boiler to heat the steam discharged from the boiler, so as to obtain steam at a higher temperature. This high-temperature steam can be sent to the power generation system to generate electricity.

[0003] The structure of the superheater used in a certain region is as follows: Figures 1-2 As shown, it includes a heat insulation shell 1, a cover plate 2 fixedly mounted on the top of the heat insulation shell 1, a stepped hole 3 opened in the cover plate 2, a serpentine tube installed inside the heat insulation shell 1, the serpentine tube including a bent tube 4, a straight tube 5 fixedly connected to both ends of the bent tube 4, a connecting plate 6 welded to the top surface of the bent tube 4, the top end of the connecting plate 6 fixed to the bottom surface of the cover plate 2, two straight tubes 5 respectively passing through two stepped holes 3 on the cover plate 2, a sealing component A7 is provided between the stepped hole 3 and the straight tube 5, the function of the sealing component A7 is to prevent the flue gas in the heat insulation shell 1 from leaking from the stepped hole 3, so as to achieve a sealing effect.

[0004] The sealing assembly A7 includes a sealing ring 8 fitted outside the straight pipe 5 and embedded in the stepped hole 3, and an end cap 9 positioned directly above the sealing ring 8. The end cap 9 is fitted outside the straight pipe 5 and fixed to the top surface of the cover plate 2 by multiple locking screws A10, thereby confining the sealing ring 8 within the stepped hole 3. The sealing ring 8 prevents the flue gas inside the heat insulation shell 1 from leaking to the outside, thus achieving a sealing effect.

[0005] After the sealing ring 8 has been in operation for a period of time, it will deform irregularly, resulting in a gap between the sealing ring 8 and the straight pipe 5. This will cause the flue gas inside the heat insulation shell 1 to leak out through the gap. To do this, the worker needs to unscrew the locking screw A10 between the end cover 9 and the cover plate 2, and then remove the deformed sealing ring 8 from the stepped hole 3. After removal, a new sealing ring is replaced to ensure that the sealing assembly A7 can continue to play a sealing role.

[0006] However, while this sealing component A7 can achieve a sealing effect, it still has the following technical defects:

[0007] I. When the sealing ring 8 is irregularly deformed, it is necessary to manually unscrew multiple locking screws A10 between the end cover 9 and the cover plate 2 in order to replace the deformed sealing ring. However, there are as many as 8 locking screws A10 to be unscrewed. It is necessary to manually unscrew all the locking screws A10 one by one in order to replace the deformed sealing ring 8, which is a technical defect that makes it inconvenient to replace the sealing ring 8.

[0008] II. If the sealing ring 8 needs to be replaced every time it undergoes irregular deformation, this will undoubtedly increase the operating cost of the superheater.

[0009] Therefore, there is an urgent need for a sealing component that can quickly put deformed seals into use and save on the operating costs of superheaters. Utility Model Content

[0010] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sealing assembly for the serpentine tube of a superheater that enables the deformed seal to be put into use quickly and saves the operating cost of the superheater.

[0011] The purpose of this utility model is achieved through the following technical solution: a sealing assembly for a serpentine tube of a superheater, comprising a sealing ring fitted around the straight tube of the serpentine tube and embedded in a stepped hole in a cover plate, a threaded sleeve provided directly above the sealing ring, the threaded sleeve having a central hole arranged axially within it, the central hole communicating with the stepped hole, the central hole of the threaded sleeve fitting around the straight tube, and the threaded sleeve fixed to the top surface of the cover plate of the superheater; an external thread arranged axially is provided on the outer cylindrical surface of the threaded sleeve, a pressure sleeve threaded onto the external thread, the inner cavity of the pressure sleeve fitting around the straight tube, multiple rods welded to the bottom surface of the inner cavity of the pressure sleeve, an annular plate fitted around the straight tube between the bottom surfaces of the rods, the annular plate passing through the central hole of the threaded sleeve and abutting against the top surface of the sealing ring, the sealing ring preventing flue gas inside the insulation shell from leaking to the outside, thus achieving a sealing function.

[0012] The diameter of the central hole of the threaded sleeve is equal to the diameter of the large hole of the stepped hole, and the central hole and the stepped hole are coaxially arranged.

[0013] The threaded sleeve is fixed to the cover plate by locking screw B.

[0014] The annular plate has a through hole arranged along its axial direction, and the through hole of the annular plate is sleeved on the outside of the straight pipe.

[0015] The inner cavity of the pressure sleeve is provided with an internal thread, and the internal thread of the pressure sleeve is threadedly connected to the external thread of the threaded sleeve to fix it on the threaded sleeve.

[0016] The rods are evenly distributed on the bottom surface of the inner cavity of the pressure sleeve.

[0017] This invention has the following advantages: it enables deformed seals to be put into use quickly and saves the cost of using superheaters. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a superheater used in a certain region;

[0019] Figure 2 for Figure 1 A magnified view of part I;

[0020] Figure 3 This is a schematic diagram of the structure of this utility model;

[0021] Figure 4 for Figure 3 Enlarged view of part II;

[0022] Figure 5 This is an isometric view of the threaded sleeve.

[0023] Figure 6 for Figure 5 Main section diagram;

[0024] Figure 7 This is a schematic diagram showing the connection between the compression sleeve and the rod.

[0025] Figure 8 for Figure 7 Main section diagram;

[0026] In the picture:

[0027] 1-Insulation shell, 2-Cover plate, 3-Stepped hole, 4-Bent pipe, 5-Straight pipe, 6-Connecting plate, 7-Sealing assembly A, 8-Sealing ring, 9-End cap, 10-Locking screw A;

[0028] 11-Threaded sleeve, 12-Center hole, 13-External thread, 14-Pressure sleeve, 15-Ring, 16-Annular plate, 17-Locking screw B. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description:

[0030] like Figures 3-8As shown, a sealing assembly for a serpentine tube of a superheater includes a sealing ring 8 fitted around the outside of a straight tube 5 of the serpentine tube and embedded in a stepped hole 3 of a cover plate 2. A threaded sleeve 11 is positioned directly above the sealing ring 8. The threaded sleeve 11 has a central hole 12 arranged axially within it, which communicates with the stepped hole 3. The central hole 12 of the threaded sleeve 11 is fitted around the outside of the straight tube 5, and the threaded sleeve 11 is fixed to the top surface of the cover plate 2 of the superheater. A axially arranged... The external thread 13 is threaded onto a pressure sleeve 14. The inner cavity of the pressure sleeve 14 is fitted onto the outside of the straight pipe 5. Multiple rods 15 are welded to the bottom surface of the inner cavity of the pressure sleeve 14. The rods 15 are evenly distributed on the bottom surface of the inner cavity of the pressure sleeve 14. An annular plate 16 is welded between the bottom surfaces of the rods 15 and fitted onto the outside of the straight pipe 5. The annular plate 16 passes through the central hole 12 of the threaded sleeve 11 and abuts against the top surface of the sealing ring 8. The sealing ring 8 prevents the flue gas inside the heat insulation shell 1 from leaking to the outside, thus achieving a sealing function. The annular plate 16 has a through hole arranged along its axial direction, and the through hole of the annular plate 16 is fitted onto the outside of the straight pipe 5.

[0031] The diameter of the central hole 12 of the threaded sleeve 11 is equal to the diameter of the large hole of the stepped hole 3, and the central hole 12 and the stepped hole 3 are coaxially arranged. The threaded sleeve 11 is fixed to the cover plate 2 by a locking screw B17. The inner cavity of the pressure sleeve 14 is provided with an internal thread, and the internal thread of the pressure sleeve 14 is threadedly connected to the external thread 13 of the threaded sleeve 11 to fix it on the threaded sleeve 11.

[0032] After the sealing ring 8 has been working for a period of time, it will inevitably deform irregularly, resulting in a gap between the sealing ring 8 and the straight pipe 5. The flue gas inside the insulation shell 1 will leak out through this gap. At this time, the operator's operation method is as follows: the operator manually rotates the pressure sleeve 14 so that the pressure sleeve 14 rotates downward relative to the stationary threaded sleeve 11. The pressure sleeve 14 drives the rod 15 and the annular plate 16 to rotate synchronously. At the same time, the rod 15 and the annular plate 16 move downward. The annular plate 16 presses down on the deformed sealing ring 8. When the sealing ring 8 is squeezed by the annular plate 16, the sealing ring 8 expands outward, thereby compensating for the gap between the sealing ring 8 and the straight pipe 5, so that the sealing ring 8 can return to the working state, thereby preventing the flue gas inside the insulation shell 1 from leaking to the outside.

[0033] Therefore, when the sealing ring 8 undergoes irregular deformation, the worker only needs to rotate the pressure sleeve 14 downwards to expand the deformed sealing ring 8 outwards, thus restoring it to its working state. Therefore, compared to the original sealing assembly A7, this sealing assembly eliminates the need for workers to unscrew the multiple locking screws A10 between the end cover 9 and the cover plate 2 to replace the deformed sealing ring, allowing for quick commissioning of the deformed seal. Furthermore, the elimination of frequent replacements of the sealing ring 8 significantly reduces the operating costs of the superheater compared to the original sealing assembly A7.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealing assembly for a serpentine tube of a superheater, characterized in that: It includes a sealing ring (8) fitted outside the straight tube (5) of the serpentine tube and embedded in the stepped hole (3) of the cover plate (2). A threaded sleeve (11) is provided directly above the sealing ring (8). A central hole (12) is provided in the threaded sleeve (11) along its axial direction. The central hole (12) is connected to the stepped hole (3). The central hole (12) of the threaded sleeve (11) is fitted outside the straight tube (5) and the threaded sleeve (11) is fixed on the top surface of the cover plate (2) of the superheater. The outer cylindrical surface of the threaded sleeve (11) is provided with an external thread (13) arranged along its axial direction. A pressure sleeve (14) is threaded onto the external thread (13). The inner cavity of the pressure sleeve (14) is fitted outside the straight pipe (5). Multiple rods (15) are welded on the bottom surface of the inner cavity of the pressure sleeve (14). An annular plate (16) fitted outside the straight pipe (5) is welded between the bottom surfaces of the rods (15). The annular plate (16) passes through the central hole (12) of the threaded sleeve (11) and abuts against the top surface of the sealing ring (8). The sealing ring (8) prevents the flue gas inside the heat insulation shell (1) from leaking to the outside, so as to play a sealing role.

2. The sealing assembly for the serpentine tube of a superheater according to claim 1, characterized in that: The diameter of the central hole (12) of the threaded sleeve (11) is equal to the diameter of the large hole of the stepped hole (3), and the central hole (12) and the stepped hole (3) are coaxially arranged.

3. The sealing assembly for the serpentine tube of a superheater according to claim 1, characterized in that: The threaded sleeve (11) is fixed to the cover plate (2) by the locking screw B (17).

4. The sealing assembly for the serpentine tube of a superheater according to claim 1, characterized in that: The annular plate (16) has a through hole arranged along its axial direction, and the through hole of the annular plate (16) is sleeved on the outside of the straight pipe (5).

5. The sealing assembly for the serpentine tube of a superheater according to claim 1, characterized in that: The inner cavity of the pressure sleeve (14) is provided with an internal thread, and the internal thread of the pressure sleeve (14) is threadedly connected to the external thread (13) of the threaded sleeve (11) to fix it on the threaded sleeve (11).

6. The sealing assembly for the serpentine tube of a superheater according to claim 1, characterized in that: The rods (15) are evenly distributed on the bottom surface of the inner cavity of the pressure sleeve (14).

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