High-strength pipeline expansion joint for power pipeline

Abstract

The utility model relates to the technical field of expansion joints, and discloses a high-strength pipeline expansion joint for a power pipeline, which solves the problem of poor use effect of the existing pipeline expansion joint, and comprises a corrugated pipe, a first flange plate is fixedly arranged at one end of the corrugated pipe, and a second flange plate is fixedly arranged at the other end of the corrugated pipe. The first flange plate and the second flange plate are connected through a plurality of pull rods, a plurality of positioning nuts matched with the first flange plate and the second flange plate are arranged at the two ends of each pull rod, and a first neck bush located in the corrugated pipe is fixedly arranged at one end of the first flange plate; a second neck bush located in the corrugated pipe and the first neck bush is fixedly arranged at one end of the second flange plate, and a sealing limiting sliding sleeve connected into the first neck bush in a sliding mode is arranged at the end, away from the second flange plate, of the second neck bush. Through the pipeline expansion joint, the influence of steam on the corrugated pipe can be reduced, and the overall strength and the use stability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of expansion joints, in particular to a high-strength pipeline expansion joint for power pipelines. Background Art

[0002] There are many types of power pipelines, among which steam pipelines used in thermal power plants are also a type of power pipeline. Power steam pipelines need to withstand high temperatures and a certain degree of impact force when in use, so it is necessary to install pipeline expansion joints. Pipeline expansion joints, as a kind of elastic compensation element that can freely expand and contract, have the advantages of reliable operation, good performance, and compact structure. However, the structure of existing power steam pipelines is relatively simple, and the gas temperature and pressure in the steam pipeline are high, which is highly corrosive to the bellows. The inner wall of the bellows is easily damaged, which in turn affects the service life of the expansion joint. Therefore, the present application proposes a high-strength pipeline expansion joint for power pipelines to improve the existing expansion joints. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a high-strength pipeline expansion joint for power pipelines, which effectively solves the problem that the existing pipeline expansion joints have poor use effects.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-strength pipe expansion joint for power pipelines, comprising a bellows, a first flange plate fixedly provided at one end of the bellows, a second flange plate fixedly provided at the other end of the bellows, the first flange plate and the second flange plate being connected by a plurality of tie rods, both ends of the tie rods being provided with a plurality of positioning nuts matching the first flange plate and the second flange plate, a first inner sleeve fixedly provided at one end of the first flange plate being located inside the bellows, a second inner sleeve fixedly provided at one end of the second flange plate being located inside the bellows and the first inner sleeve, a sealing limit sleeve slidably connected to the inside of the first inner sleeve being provided at one end of the second inner sleeve away from the second flange plate.

[0005] Preferably, a first sealing gasket is fixedly provided at one end of the first flange plate away from the bellows, and a second sealing gasket is fixedly provided at one end of the second flange plate away from the bellows.

[0006] Preferably, a convex ring is fixedly provided at one end of the inner surface of the first inner sleeve, an annular groove is provided on the inner surface of the convex ring, a sealing ring slidably connected to the outer surface of the second inner sleeve is provided inside the annular groove, and a plurality of positioning grooves are provided at one end of the inner side of the first inner sleeve.

[0007] Preferably, a convex ring 2 is fixedly provided at one end of the outer surface of the second inner sleeve, an annular groove 2 is provided on the outer surface of the convex ring 2, a sealing ring 2 which is slidably connected to the inner surface of the first inner sleeve is provided inside the annular groove 2, a plurality of bolt holes are provided on the side of one end of the second inner sleeve, and a plurality of positioning rods which are inserted into the positioning groove and slidably connected to the positioning groove are fixedly provided on the side of one end of the second flange plate.

[0008] Preferably, a groove matching the second inner sleeve is provided at one end of the sealing limit sleeve, an L-shaped sealing gasket is provided on the inner surface of the groove, a plurality of long screws matching the bolt holes are inserted on the sealing limit sleeve, an annular groove three is provided in the middle position of the outer surface of the sealing limit sleeve, and a sealing ring three slidingly connected to the inner surface of the first inner sleeve is provided inside the annular groove three.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] (1) During operation, the bellows, the first flange plate and the second flange plate can be provided to achieve connection with the power steam pipeline, realize elastic compensation of the pipeline, and improve the service life of the steam pipeline. The first sealing gasket and the second sealing gasket can improve the sealing performance of the connection between the first flange plate and the second flange plate and the steam pipeline;

[0011] (2) By providing a first inner sleeve, a second inner sleeve and a sealing limit sleeve, steam can be isolated to prevent steam from directly acting on the bellows and affecting the service life of the bellows. By providing a sealing ring 1, a sealing ring 2 and a sealing ring 3, the sealing performance of the connection between the first inner sleeve and the second inner sleeve and the sealing limit sleeve can be improved. By providing a sealing limit sleeve, a positioning groove and a positioning rod, a limiting effect can be achieved, thereby improving the overall strength and stability of the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0013] In the attached picture:

[0014] Figure 1 This is a schematic diagram of the structure of a high-strength pipeline expansion joint for power pipelines of the utility model;

[0015] Figure 2 This is a cross-sectional view of a high-strength pipeline expansion joint for a power pipeline according to the utility model;

[0016] Figure 3 This is a schematic diagram of the connection structure between the first flange plate and the first inner sleeve of the utility model;

[0017] Figure 4 This is a schematic diagram of the connection structure between the second flange plate and the second inner sleeve of the utility model;

[0018] Figure 5 This is a schematic diagram of the sealing limit sleeve structure of the utility model;

[0019] In the figure: 1. bellows; 2. first flange plate; 3. second flange plate; 4. pull rod; 5. positioning nut; 6. first inner sleeve; 7. second inner sleeve; 8. sealing limit sleeve; 9. first sealing gasket; 10. second sealing gasket; 11. convex ring one; 12. annular groove one; 13. sealing ring one; 14. positioning groove; 15. convex ring two; 16. annular groove two; 17. sealing ring two; 18. bolt hole; 19. positioning rod; 20. slot; 21. L-shaped sealing gasket; 22. long screw; 23. annular groove three; 24. sealing ring three. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] Depend on Figures 1 to 5 The utility model provides a high-strength pipeline expansion joint for power pipelines, comprising a bellows 1, a first flange plate 2 is fixedly provided at one end of the bellows 1, a second flange plate 3 is fixedly provided at the other end of the bellows 1, the first flange plate 2 and the second flange plate 3 are connected by a plurality of tie rods 4, both ends of the tie rods 4 are provided with a plurality of positioning nuts 5 matching the first flange plate 2 and the second flange plate 3, a first inner sleeve 6 located inside the bellows 1 is fixedly provided at one end of the first flange plate 2, a second inner sleeve 7 located inside the bellows 1 and the first inner sleeve 6 is fixedly provided at one end of the second flange plate 3, a sealing limiting sleeve 8 slidably connected to the inside of the first inner sleeve 6 is provided at one end of the second inner sleeve 7 away from the second flange plate 3, a first sealing gasket 9 is fixedly provided at one end of the first flange plate 2 away from the bellows 1, and a second sealing gasket 10 is fixedly provided at one end of the second flange plate 3 away from the bellows 1;

[0022] When in use, the first flange plate 2 and the second flange plate 3 are connected to the steam pipe, and the first sealing gasket 9 and the second sealing gasket 10 can improve the sealing performance of the connection. The first inner liner 6, the second inner liner 7 and the sealing limit sleeve 8 can isolate the steam to prevent the steam from directly impacting the bellows 1 and affecting the service life of the bellows 1.

[0023] Depend on Figures 1 to 5 It is given that a convex ring 11 is fixedly provided at one end of the inner surface of the first inner bushing 6, and an annular groove 12 is provided on the inner surface of the convex ring 11. A sealing ring 13 that is slidably connected to the outer surface of the second inner bushing 7 is provided inside the annular groove 12. A plurality of positioning grooves 14 are provided at one end of the inner side of the first inner bushing 6. A convex ring 2 15 is fixedly provided at one end of the outer surface of the second inner bushing 7. An annular groove 2 16 is provided on the outer surface of the convex ring 2 15. A sealing ring 2 17 that is slidably connected to the inner surface of the first inner bushing 6 is provided inside the annular groove 2 16. The side of one end of the second inner bushing 7 is provided with a plurality of positioning grooves 14. A plurality of bolt holes 18 are provided on the side, a plurality of positioning rods 19 inserted in the positioning groove 14 and slidably connected thereto are fixedly provided on the side of one end of the second flange plate 3, a groove 20 matching the second inner bushing 7 is provided on one end of the sealing limit sleeve 8, an L-shaped sealing gasket 21 is provided on the inner surface of the groove 20, a plurality of long screws 22 matching the bolt holes 18 are inserted on the sealing limit sleeve 8, an annular groove three 23 is provided in the middle position of the outer surface of the sealing limit sleeve 8, and a sealing ring three 24 slidably connected to the inner surface of the first inner bushing 6 is provided inside the annular groove three 23;

[0024] Sliding sealing is achieved through sealing ring 13, sealing ring 2 17 and sealing ring 3 24, which can improve the sealing of the connection. The sealing limit sleeve 8 is slidably connected to the inside of the first inner sleeve 6. On the one hand, it can enhance the sealing of the connection and realize the diversion of steam. At the same time, it can form a limit with the first inner sleeve 6. Through the positioning groove 14 and the positioning rod 19, further limiting effect can be achieved to avoid radial deviation of the expansion joint and improve the overall strength and stability of the expansion joint.

[0025] During operation, by providing a bellows, a first flange plate and a second flange plate, connection with an electric steam pipeline can be achieved, elastic compensation for the pipeline can be achieved, and the service life of the steam pipeline can be improved; by providing a first sealing gasket and a second sealing gasket, the sealing performance of the connection between the first flange plate and the second flange plate and the steam pipeline can be improved; by providing a first inner sleeve, a second inner sleeve and a sealing limit sleeve, steam can be isolated to prevent steam from directly acting on the bellows and affecting the service life of the bellows; by providing a sealing ring one, a sealing ring two and a sealing ring three, the sealing performance of the connection between the first inner sleeve and the second inner sleeve and the sealing limit sleeve can be improved; by providing a sealing limit sleeve, a positioning groove and a positioning rod, a limiting effect can be achieved, thereby improving the overall strength and stability of the expansion joint.

Claims

1. A high-strength expansion joint for a power pipeline, comprising a bellows (1), characterized in that: A first flange plate (2) is fixedly provided at one end of the bellows (1), and a second flange plate (3) is fixedly provided at the other end of the bellows (1). The first flange plate (2) and the second flange plate (3) are connected via a plurality of tie rods (4), and a plurality of positioning nuts (5) matching the first flange plate (2) and the second flange plate (3) are provided at both ends of the tie rods (4). A first inner sleeve (6) located inside the bellows (1) is fixedly provided at one end of the first flange plate (2), and a second inner sleeve (7) located inside the bellows (1) and the first inner sleeve (6) is fixedly provided at one end of the second flange plate (3). A sealing limit sleeve (8) slidably connected to the inside of the first inner sleeve (6) is provided at one end of the second inner sleeve (7) away from the second flange plate (3).

2. A high-strength pipeline expansion joint for electric power pipeline according to claim 1, characterized in that: A first sealing gasket (9) is fixedly provided at one end of the first flange plate (2) away from the bellows (1), and a second sealing gasket (10) is fixedly provided at one end of the second flange plate (3) away from the bellows (1).

3. A high-strength pipe expansion joint for electric power pipeline according to claim 1, characterized in that: A convex ring (11) is fixedly provided at one end of the inner surface of the first inner sleeve (6), an annular groove (12) is provided on the inner surface of the convex ring (11), a sealing ring (13) slidably connected to the outer surface of the second inner sleeve (7) is provided inside the annular groove (12), and a plurality of positioning grooves (14) are provided at one end of the inner side of the first inner sleeve (6).

4. A high-strength pipe expansion joint for electric power pipeline according to claim 3, characterized in that: A second convex ring (15) is fixedly provided at one end of the outer surface of the second inner sleeve (7), and an annular groove (16) is provided on the outer surface of the second convex ring (15). A second sealing ring (17) is provided inside the second annular groove (16) and is slidably connected to the inner surface of the first inner sleeve (6). A plurality of bolt holes (18) are provided on the side of one end of the second inner sleeve (7), and a plurality of positioning rods (19) are fixedly provided on the side of one end of the second flange plate (3) and are inserted into the positioning groove (14) and slidably connected thereto.

5. A high-strength pipeline expansion joint for electric power pipeline according to claim 4, characterized in that: A groove (20) matching the second inner sleeve (7) is provided at one end of the sealing limit sleeve (8), an L-shaped sealing gasket (21) is provided on the inner surface of the groove (20), a plurality of long screws (22) matching the bolt holes (18) are inserted through the sealing limit sleeve (8), an annular groove three (23) is provided in the middle position of the outer surface of the sealing limit sleeve (8), and a sealing ring three (24) slidably connected to the inner surface of the first inner sleeve (6) is provided inside the annular groove three (23).

Images