Sealing structure for improving vacuum value of steam turbine and assembling method

Abstract

The sealing structure for improving the vacuum value of the steam turbine comprises a static part fixing piece, a movable part fixing piece is arranged at one end of the static part fixing piece, the space between the movable part fixing piece and the static part fixing piece is filled with a sealing medium, the static part fixing piece comprises a first pipe body, a sealing groove is formed in one end of the first pipe body, and the sealing medium is located in the sealing groove; a first shell is welded to one side of the outer wall of the first pipe body, a sealing bearing is arranged in the first shell, the movable part fixing piece comprises a second pipe body, an insertion ring piece is integrally formed at one end of the second pipe body, the insertion ring piece is inserted into the sealing groove, and a second shell is welded to one side of the outer wall of the second pipe body; the sealing medium is filled into the sealing groove to form an oil seal structure, the first pipe body and the second pipe body can form a multi-sealing structure by matching with the design of the sealing bearing and the inserting ring piece, the sealing performance between gaps of the movable part and the static part of the steam turbine is improved, the vacuum effect of the steam turbine can be improved, and the vacuum value of the steam turbine is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and particularly relates to a sealing structure and an assembly method for improving the vacuum value of a steam turbine. Background Art

[0002] In order to avoid collisions between the moving and static components of a steam turbine, appropriate clearances must be left. The existence of these clearances inevitably results in steam leakage and reduces efficiency. To solve this contradiction, a sealing device is installed at the clearances between the moving and static components of the steam turbine. Among them, on a steam turbine, using an oil seal has some advantages over a steam seal.

[0003] For example, a sealing structure and an assembly method for improving the vacuum value of a steam turbine with the application number CN202311213091.2 and the publication date December 29, 2023, through a first sealing cavity and a second sealing cavity in an oil sealing shell close to the inside of a chamber body to perform multiple seals between a rotating shaft and the chamber body. When steam leaks from the first sealing cavity, the steam enters the second sealing cavity and then enters the first cavity, pushing a baffle plate to inject the oil in the first cavity into the first sealing cavity to achieve re-sealing of the first sealing cavity, and seal the first sealing cavity repeatedly in this way. A first half shell and a second half shell are installed on the outer wall of the rotating shaft, and the first half shell and the second half shell are inserted and locked. This is achieved by screwing a valve into the first half shell. The valve drives the insert in the first half shell to move into the second half shell, realizing the locking between the first half shell and the second half shell to form an oil sealing shell, achieving simple and rapid installation and sealing lock of the sealing member.

[0004] Although the oil seal structure between the moving part and the static part of a steam turbine can improve the sealing performance between the moving part and the static part of the steam turbine, due to the large amount of movement between the moving part and the static part of the steam turbine, a single oil seal structure cannot ensure the sealing performance between the moving part and the static part of the steam turbine, which will affect the vacuum effect of the steam turbine. Therefore, it is urgent to design a sealing structure and an assembly method for improving the vacuum value of a steam turbine to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing structure and an assembly method for improving the vacuum value of a steam turbine to solve the above deficiencies in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A sealing structure for improving the vacuum value of a steam turbine, including a static part fixing member, one end of the static part fixing member is provided with a dynamic part fixing member, and a sealing medium is filled between the dynamic part fixing member and the static part fixing member. The static part fixing member includes a first pipe body, one end of the first pipe body is provided with a sealing groove, the sealing medium is located inside the sealing groove, one side of the outer wall of the first pipe body is welded with a first housing, and a sealing bearing is arranged inside the first housing. The dynamic part fixing member includes a second pipe body, one end of the second pipe body is integrally formed with an insertion ring member, and the insertion ring member is inserted into the sealing groove. One side of the outer wall of the second pipe body is welded with a second housing, and one end of the sealing bearing is inserted into the second housing.

[0008] Further, one side of the outer wall of the top of the second housing is inserted with an oil filling pipe, and one end of the oil filling pipe extends into the second housing.

[0009] Further, on one side of the outer wall of the first pipe body and the second pipe body, a first flange ring is integrally formed, and a plurality of first through holes are provided on one side of the outer wall of the first flange ring.

[0010] Further, on one side of the outer wall of the second pipe body, a second flange ring is integrally formed, and a plurality of second through holes are provided on one side of the outer wall of the second flange ring.

[0011] Further, a plurality of sealing strips are adhesively bonded to the inner wall of the sealing groove, and the insertion ring member is in contact with the sealing strips.

[0012] Further, an oil injection pipe is inserted into one side of the outer wall of the top of the first pipe body, and the oil injection pipe communicates with the sealing groove.

[0013] Further, an oil drain pipe is inserted into one side of the outer wall of the bottom of the first pipe body, and the oil drain pipe communicates with the sealing groove.

[0014] Further, sealing rings are provided at one ends of the first pipe body and the second pipe body, and an oil inlet pipe is inserted into one side of the outer wall of the top of the second pipe body.

[0015] Further, a method for assembling a sealing structure for improving the vacuum value of a steam turbine, characterized by comprising the following steps:

[0016] S1. First, pass bolts through the first through holes, so that the first flange ring drives the first pipe body to be fixed on the static part of the steam turbine, and then sleeve the second pipe body on the output shaft of the dynamic part of the steam turbine;

[0017] S2. Through the cooperation of the bolts and the second flange ring, fix the dynamic part fixing member on the output shaft of the dynamic part of the steam turbine, and then install the sealing bearing inside the first housing;

[0018] S3. Through the cooperation of the insertion ring member and the sealing groove, install the first pipe body and the second pipe body together to combine the output shaft of the dynamic part and the static part of the steam turbine;

[0019] S4. Add lubricating oil into the sealing groove, the interiors of housing one and housing two, and the interiors of pipe one and pipe two through the oil injection pipe, the fueling pipe and the inlet pipe.

[0020] In the above technical solution, for a sealing structure and an assembly method for improving the vacuum value of a steam turbine provided by the present invention, the beneficial effects are as follows:

[0021] (1) Through the provided sealing medium, sealing bearing, inserting ring member and sealing groove, the sealing medium filling into the sealing groove can form an oil seal structure. With the design of the sealing bearing and the inserting ring member, pipe one and pipe two can form a multi - layer sealing structure, improving the sealing performance between the moving part and the static part of the steam turbine, being able to improve the vacuum effect of the steam turbine and increasing the vacuum value of the steam turbine.

[0022] (2) Through the provided static part fixing member and moving part fixing member, the static part fixing member and the moving part fixing member are of a split - type design. When a part of the sealing structure is damaged, only the damaged part needs to be replaced without overall replacement. Moreover, the static part fixing member and the moving part fixing member can form a sleeve - type sealing structure, having a relatively long structure, being able to increase the sealing length and reducing the probability of leakage between the moving part and the static part of the steam turbine.

[0023] (3) Through the provided flange ring one and flange ring two, with through holes one and two opened on the flange ring one and flange ring two, it is convenient to install the static part fixing member and the moving part fixing member on the static part and the moving part of the steam turbine through bolts, and it is beneficial to improve the firmness between the sealing structure and the moving part and the static part of the steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure provided for an embodiment of a sealing structure for improving the vacuum value of a steam turbine according to the present invention.

[0026] Figure 2 It is a cross - sectional view of the overall planar structure provided for an embodiment of a sealing structure for improving the vacuum value of a steam turbine according to the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the static part fixing member provided for an embodiment of a sealing structure for improving the vacuum value of a steam turbine according to the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of pipe one provided for an embodiment of a sealing structure for improving the vacuum value of a steam turbine according to the present invention.

[0029] Figure 5 Schematic diagram of the moving part fixing structure provided for an embodiment of a sealing structure for improving the vacuum value of a steam turbine according to the present invention.

[0030] Figure 6 Schematic side view of the moving part fixing structure provided for an embodiment of a sealing structure for improving the vacuum value of a steam turbine according to the present invention.

[0031] Description of reference numerals:

[0032] 1. Static part fixing member; 2. Moving part fixing member; 3. Sealing medium; 4. Pipe body I; 5. Flange ring I; 6. Through hole I; 7. Housing I; 8. Sealing bearing; 9. Sealing groove; 10. Sealing strip; 11. Oil injection pipe; 12. Oil drain pipe; 13. Pipe body II; 14. Flange ring II; 15. Through hole II; 16. Housing II; 17. Oil filling pipe; 18. Insert ring member; 19. Sealing ring; 20. Oil inlet pipe. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0034] As Figures 1-6 shown, a sealing structure for improving the vacuum value of a steam turbine provided by an embodiment of the present invention includes a static part fixing member 1. One end of the static part fixing member 1 is provided with a moving part fixing member 2, and a sealing medium 3 is filled between the moving part fixing member 2 and the static part fixing member 1. The static part fixing member 1 includes a pipe body I 4. One end of the pipe body I 4 is provided with a sealing groove 9. The sealing medium 3 is located inside the sealing groove 9. One side of the outer wall of the pipe body I 4 is welded with a housing I 7, and a sealing bearing 8 is arranged inside the housing I 7. The moving part fixing member 2 includes a pipe body II 13. One end of the pipe body II 13 is integrally formed with an insert ring member 18, and the insert ring member 18 is inserted into the sealing groove 9. One side of the outer wall of the pipe body II 13 is welded with a housing II 16. One end of the sealing bearing 8 is inserted into the housing II 16.

[0035] Specifically, in this embodiment, it includes a static part fixing member 1. One end of the static part fixing member 1 is provided with a moving part fixing member 2, and a sealing medium 3 is filled between the moving part fixing member 2 and the static part fixing member 1. The sealing medium 3 is a sealing oil with a relatively high viscosity. The static part fixing member 1 includes a first pipe body 4. One end of the first pipe body 4 is provided with a sealing groove 9. The sealing medium 3 is located inside the sealing groove 9. On one side of the outer wall of the first pipe body 4, a first housing 7 is welded, and a sealing bearing 8 is arranged inside the first housing 7. The sealing bearing 8, in cooperation with the sealing medium 3 entering the sealing groove 9 and the inserting ring member 18, can form a triple sealing structure, improving the sealing between the static part fixing member 1 and the moving part fixing member 2, thereby enhancing the sealing performance between the static part and the moving part of the steam turbine equipped with the static part fixing member 1 and the moving part fixing member 2. The moving part fixing member 2 includes a second pipe body 13. One end of the second pipe body 13 is integrally formed with an inserting ring member 18, and the inserting ring member 18 is inserted into the sealing groove 9. On one side of the outer wall of the second pipe body 13, a second housing 16 is welded. The sealing bearing 8 is installed between the second housing 16 and the first housing 7, which can improve the sealing effect between the first pipe body 4 and the second pipe body 13. One end of the sealing bearing 8 is inserted into the second housing 16.

[0036] For a sealing structure for improving the vacuum value of a steam turbine provided by the present invention, since the sealing medium 3 fills into the sealing groove 9 to form an oil seal structure, and in combination with the design of the sealing bearing 8 and the inserting ring member 18, the first pipe body 4 and the second pipe body 13 can form a multi - layer sealing structure, which can improve the vacuum effect of the steam turbine and increase the vacuum value of the steam turbine.

[0037] In an embodiment provided by the present invention, as Figures 3-6 shown, on one side of the outer walls of the second pipe body 13 and the first pipe body 4, a first flange ring 5 is integrally formed, and a plurality of first through - holes 6 are provided on the outer wall of one side of the first flange ring 5. On one side of the outer wall of the second pipe body 13, a second flange ring 14 is integrally formed, and a plurality of second through - holes 15 are provided on the outer wall of one side of the second flange ring 14.

[0038] In another embodiment provided by the present invention, as Figures 3-4 shown, a plurality of sealing strips 10 are adhered to the inner wall of the sealing groove 9. The sealing strips 10 can improve the sealing performance between the inserting ring member 18 and the sealing groove 9. The inserting ring member 18 is in contact with the sealing strips 10. On one side of the outer wall at the top of the first pipe body 4, an oil injection pipe 11 is inserted. The oil injection pipe 11 is connected to an external lubricating oil storage device, facilitating the injection of the sealing medium 3 into the sealing groove 9. The oil injection pipe 11 is in communication with the sealing groove 9. On one side of the outer wall at the bottom of the first pipe body 4, an oil drain pipe 12 is inserted. By unscrewing the oil drain pipe 12, the waste oil inside the sealing groove 9 can flow out, and the oil drain pipe 12 is in communication with the sealing groove 9.

[0039] In still another embodiment provided by the present invention, as Figures 5-6As shown, on one side of the outer wall at the top of the second housing 16, a fuel filling pipe 17 is inserted. The fuel filling pipe 17 facilitates injecting lubricating oil into the sealed bearings 8 in the first housing 7 and the second housing 16. One end of the fuel filling pipe 17 extends into the interior of the second housing 16. Sealing rings 19 are provided at one end of the first pipe body 4 and the second pipe body 13. The sealing rings 19 can improve the sealing performance between the output shaft of the moving part of the steam turbine and the first pipe body 4 and the second pipe body 13. On one side of the outer wall at the top of the second pipe body 13, an oil inlet pipe 20 is inserted. The oil inlet pipe 20 facilitates injecting lubricating oil into the interior of the combined first pipe body 4 and second pipe body 13, improving the sealing effect between the structure formed by the static part fixing member 1 and the moving part fixing member 2 and the output shaft of the moving part of the steam turbine.

[0040] Embodiment 1

[0041] A sealing structure for improving the vacuum value of a steam turbine includes a static part fixing member 1. One end of the static part fixing member 1 is provided with a moving part fixing member 2, and a sealing medium 3 is filled between the moving part fixing member 2 and the static part fixing member 1. The sealing medium 3 is a sealing oil with a relatively high viscosity. The static part fixing member 1 includes a first pipe body 4. A sealing groove 9 is formed at one end of the first pipe body 4. The sealing medium 3 is located inside the sealing groove 9. On one side of the outer wall of the first pipe body 4, a first housing 7 is welded. A sealed bearing 8 is provided inside the first housing 7. The sealed bearing 8, in cooperation with the sealing medium 3 entering the sealing groove 9 and the inserting ring member 18, can form a triple sealing structure, improving the sealing between the static part fixing member 1 and the moving part fixing member 2, and thus improving the sealing performance between the static part and the moving part of the steam turbine equipped with the static part fixing member 1 and the moving part fixing member 2. The moving part fixing member 2 includes a second pipe body 13. An inserting ring member 18 is integrally formed at one end of the second pipe body 13, and the inserting ring member 18 is inserted into the sealing groove 9. On one side of the outer wall of the second pipe body 13, a second housing 16 is welded. The sealed bearing 8 is installed between the second housing 16 and the first housing 7, which can improve the sealing effect between the first pipe body 4 and the second pipe body 13. One end of the sealed bearing 8 is inserted into the second housing 16.

[0042] Embodiment 2

[0043] This embodiment makes further limitations on the basis of Embodiment 1. Among them, on one side of the outer wall of the second pipe body 13 and the first pipe body 4, a first flange ring 5 is integrally formed, and a plurality of first through holes 6 are provided on the outer wall of one side of the first flange ring 5. On one side of the outer wall of the second pipe body 13, a second flange ring 14 is integrally formed, and a plurality of second through holes 15 are provided on the outer wall of one side of the second flange ring 14. A plurality of sealing strips 10 are adhesively bonded to the inner wall of the sealing groove 9. The sealing strips 10 can improve the sealing performance between the inserting ring member 18 and the sealing groove 9. The inserting ring member 18 is in contact with the sealing strips 10. On one side of the outer wall at the top of the first pipe body 4, an oil injection pipe 11 is inserted. The oil injection pipe 11 is connected to an external lubricating oil storage device, which is convenient for injecting a sealing medium 3 into the sealing groove 9. The oil injection pipe 11 communicates with the sealing groove 9. On one side of the outer wall at the bottom of the first pipe body 4, an oil drain pipe 12 is inserted. By unscrewing the oil drain pipe 12, the waste oil inside the sealing groove 9 can flow out, and the oil drain pipe 12 communicates with the sealing groove 9. On one side of the outer wall at the top of the second housing 16, an oil filling pipe 17 is inserted. The oil filling pipe 17 is convenient for injecting lubricating oil into the sealed bearings 8 in the first housing 7 and the second housing 16. One end of the oil filling pipe 17 extends into the second housing 16. Sealing rings 19 are provided at one end of the first pipe body 4 and the second pipe body 13. The sealing rings 19 can improve the sealing performance between the output shaft of the moving part of the steam turbine and the first pipe body 4 and the second pipe body 13. On one side of the outer wall at the top of the second pipe body 13, an oil inlet pipe 20 is inserted. The oil inlet pipe 20 is convenient for injecting lubricating oil into the combined first pipe body 4 and the second pipe body 13, so as to improve the sealing effect between the structure formed by the static part fixing member 1 and the moving part fixing member 2 and the output shaft of the moving part of the steam turbine.

[0044] A method for assembling a sealing structure for improving the vacuum value of a steam turbine, characterized by comprising the following steps:

[0045] S1. First, pass bolts through the first through holes 6 so that the first flange ring 5 fixes the first pipe body 4 on the static part of the steam turbine, and then sleeve the second pipe body 13 on the output shaft of the moving part of the steam turbine;

[0046] S2. Through the cooperation of the bolts and the second flange ring 14, fix the moving part fixing member 2 on the output shaft of the moving part of the steam turbine, and then install the sealed bearing 8 inside the first housing 7;

[0047] S3. Through the cooperation of the inserting ring member 18 and the sealing groove 9, install the first pipe body 4 and the second pipe body 13 together to combine the output shaft of the moving part of the steam turbine with the static part;

[0048] S4. Through the oil injection pipe 11, the oil filling pipe 17 and the oil inlet pipe 20, add lubricating oil into the sealing groove 9, the inside of the first housing 7 and the second housing 16, and the inside of the first pipe body 4 and the second pipe body 13.

[0049] Working principle: When installing this sealing structure, the bolt can be passed through the first through hole 6 first, so that the first flange ring 5 drives the first pipe body 4 to be fixed on the static part of the steam turbine. Subsequently, the second pipe body 13 is sleeved on the output shaft of the moving part of the steam turbine, and the moving part fixing member 2 is fixed on the output shaft of the moving part of the steam turbine through the cooperation of the bolt and the second flange ring 14. Then, the sealing bearing 8 is installed inside the first housing 7. When the output shaft of the moving part of the steam turbine is combined with the static part subsequently, the first pipe body 4 and the second pipe body 13 can be installed together through the cooperation of the insertion ring member 18 and the sealing groove 9. Then, lubricating oil is added to the inside of the sealing groove 9, the first housing 7 and the second housing 16, and the first pipe body 4 and the second pipe body 13 through the oil injection pipe 11, the oil filling pipe 17 and the oil inlet pipe 20. Subsequently, when the steam turbine operates, since the sealing medium 3 fills into the sealing groove 9, an oil seal structure can be formed. The design of the sealing bearing 8 and the insertion ring member 18 can enable the first pipe body 4 and the second pipe body 13 to form a multi-layer sealing structure. The lubricating oil injected into the first pipe body 4 and the second pipe body 13 can improve the sealing performance between the moving part and the static part of the steam turbine, improve the vacuum effect of the steam turbine, and increase the vacuum value of the steam turbine. Moreover, the static part fixing member 1 and the moving part fixing member 2 can form a sleeve-type sealing structure with a relatively long structure, which can increase the sealing length and reduce the leakage probability between the moving part and the static part of the steam turbine.

[0050] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A sealing structure for improving the vacuum value of a steam turbine, comprising a stationary fixing member (1), characterized in that: The static fixing part (1) is provided with a dynamic fixing part (2) at one end, and a sealing medium (3) is filled between the dynamic fixing part (2) and the static fixing part (1); the static fixing part (1) comprises a tube body (4); a sealing groove (9) is provided at one end of the tube body (4); the sealing medium (3) is located inside the sealing groove (9); a shell (7) is welded to one side of the outer wall of the tube body (4); and a sealing bearing (8) is provided inside the shell (7); the dynamic fixing part (2) comprises a tube body (13); a plug-in ring (18) is integrally formed at one end of the tube body (13); and the plug-in ring (18) is inserted into the sealing groove (9); a shell (16) is welded to one side of the outer wall of the tube body (13); and one end of the sealing bearing (8) is inserted into the inside of the shell (16).

2. A sealing structure for improving the vacuum value of a steam turbine according to claim 1, characterized in that: A refueling pipe (17) is inserted into the outer wall of one side of the top of the second shell (16), and one end of the refueling pipe (17) extends into the interior of the second shell (16).

3. A sealing structure for improving the vacuum value of a steam turbine according to claim 1, characterized in that: The second tube body (13) and the first tube body (4) are integrally formed with a flange ring (5) on one side of the outer wall, and a plurality of through holes (6) are opened on the outer wall of one side of the flange ring (5).

4. A sealing structure for improving the vacuum value of a steam turbine according to claim 1, characterized in that: A flange ring 2 (14) is integrally formed on one side of the outer wall of the second tube body (13), and a plurality of through holes 2 (15) are opened on the outer wall of one side of the flange ring 2 (14).

5. A sealing structure for improving the vacuum value of a steam turbine according to claim 1, characterized in that: A plurality of sealing strips (10) are bonded to the inner wall of the sealing groove (9), and the insert ring (18) and the sealing strips (10) are in contact with each other.

6. A sealing structure for improving the vacuum value of a steam turbine according to claim 1, characterized in that: An oil injection pipe (11) is inserted into the outer wall of one side of the top of the tube body (4), and the oil injection pipe (11) and the sealing groove (9) are interconnected.

7. A sealing structure for improving the vacuum value of a steam turbine according to claim 1, characterized in that: An oil drain pipe (12) is inserted into the outer wall of one side of the bottom of the tube body (4), and the oil drain pipe (12) and the sealing groove (9) are interconnected.

8. A sealing structure for improving the vacuum value of a steam turbine according to claim 1, characterized in that: One end of the tube body 1 (4) and the tube body 2 (13) is provided with a sealing ring (19), and an oil inlet pipe (20) is inserted into the outer wall of one side of the top of the tube body 2 (13).

9. A sealing structure assembly method for improving the vacuum value of a steam turbine according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, first pass the bolt through the through hole 1, so that the flange ring 1 and the tube body 1 are fixed on the static part of the steam turbine, and then the tube body 2 is put on the output shaft of the dynamic part of the steam turbine; S2, fix the moving part fixing part on the moving part output shaft of the steam turbine by the cooperation of bolts and flange ring 2, and then install the sealed bearing inside the housing 1; S3, installing the pipe body 1 and the pipe body 2 together by matching the insert ring with the sealing groove to combine the output shaft of the turbine moving part with the static part; S4, add lubricating oil to the sealing groove, the inside of the housing 1 and the housing 2, and the inside of the tube body 1 and the tube body 2 through the oil filling pipe, the oil filling pipe and the oil inlet pipe.

Images