Steam seal structure of steam turbine

Abstract

The utility model relates to a steam seal structure of steam turbine relates to steam turbine technical field, including the upper steam seal and lower steam seal of coaxial assembly together, the end surface middle part of lower steam seal both ends is vertically provided with the locating stud, and the rotating insertion slot is opened to the both sides end surface of parallelism of locating stud, and the locating stud is rotatably connected with the locating block in rotating insertion slot, and the rotating axle of locating block is horizontal, and the end surface middle part of upper steam seal both ends is vertically opened to be inserted into the locating insertion hole of locating stud, and the locating slot that the locating block rotates and inserts is opened to the side wall of locating insertion hole of upper steam seal, and the locating block rotates and hides to rotating insertion slot when inserting into locating insertion hole with locating stud, and the locating block rotates and partially inserts into the locating slot to limit the pulling out of locating stud when locating stud completely inserts into locating insertion hole, and the compression spring of pushing the locating block insertion locating slot is arranged in rotating insertion slot of locating stud. Its beneficial effect is that the assembly process is more convenient, and will not loosen because of long time vibration, is more safe.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, and in particular to a steam seal structure for a steam turbine. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto blades, causing a rotor equipped with rows of blades to rotate and perform work. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship propulsion systems.

[0003] A steam turbine consists of two parts: rotating parts and stationary parts. The rotor includes the main shaft, impeller, moving blades, and couplings. The stator includes the steam inlet section, cylinder, diaphragms and stator blades, steam seals, and bearings. Steam seals are classified according to their installation location into flow passage steam seals, diaphragm steam seals, and shaft end steam seals.

[0004] Steam seals typically consist of two semi-rings assembled together. During installation, one half of the steam seal is first embedded into the steam turbine, and then the other half is hoisted to the designated position and assembled. The two halves of the steam seal are then completely fixed with bolts. When the entire steam turbine is working, high-temperature steam flows rapidly inside and causes vibrations in various components. Over time, this can easily cause the bolts connecting the two halves of the steam seal to loosen, which is very unsafe. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a steam seal structure for a steam turbine, which solves the technical problem that the rapid flow of high-temperature steam inside causes vibration of various components, which can easily lead to loosening of the bolts connecting the two halves of the steam seal after a long period of time, resulting in a very unsafe condition.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a steam turbine sealing structure, including an upper steam turbine seal and a lower steam turbine seal coaxially assembled. A positioning post is vertically disposed at the center of the end faces of both ends of the lower steam turbine seal. Rotation slots are formed on the parallel end faces of the positioning post. A positioning block is rotatably connected to the positioning post within the rotation slot. The rotation axis of the positioning block is horizontal. A positioning hole is vertically disposed at the center of the end faces of both ends of the upper steam turbine seal for the insertion of the positioning post. A positioning groove is formed on the side wall of the positioning hole of the upper steam turbine seal for the rotational insertion of the positioning block. The positioning block rotates and retracts into the rotation slot as the positioning post is inserted into the positioning hole. When the positioning post is fully inserted into the positioning hole, the positioning block rotates and partially inserts into the positioning groove to limit the removal of the positioning post. A compression spring is disposed within the rotation slot of the positioning post to push the positioning block into the positioning groove.

[0010] This utility model provides a steam turbine seal structure. When installing the steam turbine seal, the lower steam seal is placed inside the turbine casing, and then the upper steam seal is hoisted until it is aligned with the lower steam seal. The upper steam seal is then lowered so that the positioning pins at both ends of the lower steam seal are aligned with the positioning holes of the upper steam seal and inserted. During insertion, the side wall of the positioning hole pushes the positioning block to rotate, compressing the spring and completely hiding it in the rotating slot until the positioning pin is fully inserted into the positioning hole. At this time, the spring pushes the positioning block to rotate, causing the positioning block to partially insert into the positioning groove, thereby completely fixing the upper and lower steam seals together. The installation process is more convenient and will not loosen due to long-term vibration, making it safer.

[0011] Optionally, the upper end of the positioning pin is provided with a guide cone in the shape of a pointed cone.

[0012] By setting a guide cone at the upper end of the positioning pin, the guide cone can be inserted into the positioning hole first to guide the positioning pin when it is inserted into the positioning hole, making the docking of the upper steam seal and the lower steam seal more convenient.

[0013] Optionally, the two end faces of the lower steam seal have a uniform array of stable protruding cones on the outer periphery of the positioning insert, and the two end faces of the upper steam seal have a uniform array of conical grooves on the outer periphery of the positioning insert for the stable protruding cones to be inserted.

[0014] By setting stabilizing cones on the end face array at both ends of the lower steam seal, the stabilizing cones are aligned and inserted into the cone groove when the upper and lower steam seals are connected, thus making the upper and lower steam seals more stable and secure after positioning and installation.

[0015] Optionally, the lower end face of the positioning block is an arc surface with its own rotation axis as the center, the lower inner wall of the positioning groove has the same curvature as the lower end face of the positioning block, and the upper steam seal is provided with a guide groove on the side of the lower inner wall of the positioning groove near the positioning insertion hole.

[0016] By setting the lower end face of the positioning block as an arc surface with its own rotation axis as the center, and setting the lower inner wall of the positioning groove as an arc surface of the same curvature, the positioning block fits more tightly when it rotates and is inserted into the positioning groove. At the same time, a guide groove is opened at the opening of the positioning groove, so that the positioning block can be rotated and inserted into the positioning groove more easily.

[0017] Optionally, the upper steam seal has two parallel side end faces that are inclinedly provided with retraction holes that communicate with the positioning groove. A retraction rod is inserted into the retraction hole. The upper steam seal is coaxially fixed in the retraction hole with a tension spring that pulls the retraction rod to move away from the positioning groove. An operating rod that pushes the retraction rod into the positioning groove is detachably inserted at the end of the retraction hole away from the positioning groove. The retraction rod slides into the positioning groove and pushes the positioning block to rotate and insert back into the rotating slot.

[0018] When it is necessary to separate the upper and lower steam seals, insert the operating rod into the retraction hole so that the operating rod abuts against one end of the retraction rod and pushes the retraction rod to one side of the positioning groove. At this time, the tension spring is stretched, the retraction rod abuts against the positioning block and pushes the positioning block to rotate completely back into the rotating slot. At this time, the upper and lower steam seals can be separated. When the operating rod is pulled out, the tension spring pulls the retraction rod to reset, which does not affect the assembly of the upper and lower steam seals and is more convenient.

[0019] Optionally, the end of the retracting insert that abuts against the positioning block is fitted with a ball bearing.

[0020] By setting a ball at the end of the retraction rod, the ball rolls against one end face of the positioning block when the retraction rod pushes the positioning block to rotate. At the same time, when the upper steam seal and the lower steam seal separate, the ball continues to roll against the positioning block to ensure safe separation.

[0021] Optionally, the SAIC seal is coaxially threaded on the inner wall of the retraction hole, and the operating rod is positioned and connected to the thread when pushing the retraction rod to its farthest end.

[0022] By setting threads in the retraction hole, the operating rod can be directly connected to the threads when pushing the positioning block to reset, thus making it more convenient to separate the upper steam seal and the lower steam seal without having to hold the operating rod by hand.

[0023] Optionally, the upper steam seal and the lower steam seal each have a shallow sealing groove on the end face near the inner ring. The shallow sealing groove is parallel to the axis of the upper steam seal and the lower steam seal. A sealing strip is embedded in the shallow sealing groove and is compressed during the assembly of the upper steam seal and the lower steam seal.

[0024] By creating a shallow sealing groove on the side of the abutting end face of the upper and lower steam seals near the inner ring and embedding a sealing strip, the sealing strip is compressed when the upper and lower steam seals are installed together, thereby sealing the gap between the upper and lower steam seals, thus cooperating with the steam seals and improving the steam seal effect.

[0025] (III) Beneficial Effects

[0026] The beneficial effects of this utility model are as follows: In the turbine steam seal structure of this utility model, when installing the turbine steam seal, the lower steam seal is placed inside the turbine casing, and then the upper steam seal is hoisted until it aligns with the lower steam seal. The upper steam seal is then lowered so that the positioning pins at both ends of the lower steam seal are aligned with the positioning holes of the upper steam seal and inserted. During insertion, the side wall of the positioning hole pushes the positioning block to rotate, compressing the spring and completely concealing it within the rotating slot until the positioning pin is fully inserted into the positioning hole. At this point, the spring pushes the positioning block to rotate, causing part of the positioning block to insert into the positioning groove, thereby completely fixing the upper and lower steam seals together. The installation process is more convenient and will not loosen due to prolonged vibration, making it safer. Attached Figure Description

[0027] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of the end structure of the lower steam seal in an embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the end structure of the upper steam seal in an embodiment of this utility model;

[0030] Figure 4 This is a cross-sectional view of the joint end of the upper and lower steam seals in an embodiment of this utility model.

[0031] [Explanation of Labels in the Attached Image]

[0032] 1. Upper steam seal; 11. Positioning insertion hole; 12. Positioning groove; 13. Conical groove; 14. Guide groove; 15. Retraction hole; 151. Thread; 16. Retraction insertion rod; 161. Ball bearing; 17. Tension spring; 18. Operating rod; 2. Lower steam seal; 21. Positioning insertion post; 22. Rotating slot; 23. Positioning block; 24. Compression spring; 25. Guide cone block; 26. Stabilizing cone; 27. Sealing shallow groove; 28. Sealing strip. Detailed Implementation

[0033] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] The turbine seal structure proposed in this embodiment involves placing the lower steam seal into the turbine casing during installation. Then, the upper steam seal is hoisted and aligned with the lower seal. The upper seal is then lowered so that the positioning pins at both ends of the lower steam seal are aligned with the positioning holes of the upper steam seal and inserted. During insertion, the sidewall of the positioning hole pushes the positioning block to rotate, compressing the spring and completely concealing it within the rotating slot. This continues until the positioning pins are fully inserted into the positioning hole. At this point, the spring pushes the positioning block to rotate, partially inserting the positioning block into the positioning groove, thus completely fixing the upper and lower steam seals together. This makes installation more convenient and prevents loosening due to prolonged vibration, enhancing safety.

[0035] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0036] Reference Figure 1 A steam seal structure for a steam turbine includes an upper steam seal 1 and a lower steam seal 2 coaxially assembled together.

[0037] See Figure 2 , Figure 3 and Figure 4 The lower steam seal 2 has a vertically integrated positioning pin 21 at the middle of the end face of both ends. The positioning pin 21 has a rotating slot 22 on its two parallel end faces. The positioning pin 21 is rotatably connected to the positioning block 23 in the rotating slot 22 via a rotating shaft. The rotating shaft of the positioning block 23 is horizontal. The upper steam seal 1 has a vertically opened positioning hole 11 at the middle of the end face of both ends for the positioning pin 21 to be inserted. The upper steam seal 1 has a positioning groove 12 on the side wall of the positioning hole 11 for the positioning block 23 to be rotatably inserted. When the positioning pin 21 is inserted into the positioning hole 11, the positioning block 23 rotates and hides into the rotating slot 22. When the positioning pin 21 is fully inserted into the positioning hole 11, the positioning block 23 rotates and partially inserts into the positioning groove 12 to limit the removal of the positioning pin 21. The positioning pin 21 is fixed in the rotating slot 22 with a compression spring 24 that pushes the positioning block 23 into the positioning groove 12 by bolts. The positioning pins 21 at both ends of the lower steam seal 2 are aligned with the positioning holes 11 of the upper steam seal 1 and inserted. During the insertion process, the side wall of the positioning hole 11 pushes the positioning block 23 to rotate, compressing the spring 24 and completely hiding it in the rotating slot 22 until the positioning pins 21 are fully inserted into the positioning hole 11. At this time, the spring 24 pushes the positioning block 23 to rotate, so that the positioning block 23 is partially inserted into the positioning groove 12, thereby completely fixing the upper steam seal 1 and the lower steam seal 2 together.

[0038] The upper end of the positioning pin 21 is integrally provided with a pointed cone-shaped guide cone 25. When the positioning pin 21 is inserted into the positioning hole 11, the guide cone 25 can be inserted into the positioning hole 11 first for guidance, making the docking of the upper steam seal 1 and the lower steam seal 2 more convenient.

[0039] The lower steam seal 2 has stabilizing cones 26 evenly arranged on the outer periphery of the positioning insert 21 on both end faces, and the upper steam seal 1 has conical grooves 13 evenly arranged on the outer periphery of the positioning insert 11 on both end faces for inserting the stabilizing cones 26. This makes the upper steam seal 1 and the lower steam seal 2 more stable and secure along the end face direction after positioning and installation.

[0040] The lower end face of the positioning block 23 is an arc surface centered on its own axis of rotation. The lower inner wall of the positioning groove 12 has the same curvature as the lower end face of the positioning block 23. The upper steam seal 1 has a guide groove 14 on the lower inner wall of the positioning groove 12 near the positioning insertion hole 11. When the positioning block 23 is rotated and inserted into the positioning groove 12, the fit is tighter. At the same time, the guide groove 14 is opened at the opening of the positioning groove 12, so that the positioning block 23 can be rotated and inserted into the positioning groove 12 more easily.

[0041] The two parallel side ends of the upper steam seal 1 are inclinedly provided with retraction holes 15 that connect to the positioning groove 12. A retraction rod 16 is inserted into the retraction hole 15. A tension spring 17 is coaxially fixed in the retraction hole 15 to pull the retraction rod 16 to move away from the positioning groove 12. An operating rod 18 is detachably inserted into the end of the retraction hole 15 away from the positioning groove 12 to push the retraction rod 16 into the positioning groove 12. The retraction rod 16 slides into the positioning groove 12 and pushes the positioning block 23 to rotate and insert back into the rotating slot 22. When it is necessary to separate the upper steam seal 1 and the lower steam seal 2, insert the operating rod 18 into the retraction hole 15, so that the operating rod 18 abuts against one end of the retraction insert 16 and pushes the retraction insert 16 to move towards the positioning groove 12. At this time, the tension spring 17 is stretched, and the retraction insert 16 abuts against the positioning block 23 and pushes the positioning block 23 to rotate completely back into the rotating slot 22. At this time, the upper steam seal 1 and the lower steam seal 2 can be separated. When the operating rod 18 is pulled out, the tension spring 17 pulls the retraction insert 16 to reset, which does not affect the assembly of the upper steam seal 1 and the lower steam seal 2.

[0042] The end of the retraction rod 16 that abuts against the positioning block 23 is fitted with a ball bearing 161. When the retraction rod 16 pushes the positioning block 23 to rotate, the ball bearing 161 rolls against one end face of the positioning block 23. At the same time, when the upper steam seal 1 and the lower steam seal 2 separate, the ball bearing 161 continues to roll against the positioning block 23 to ensure safe separation.

[0043] The upper steam seal 1 has a thread 151 coaxially protruding on the inner wall of the retraction hole 15. The operating lever 18 is positioned and connected to the thread 151 when the retraction insert 16 is pushed to the farthest end. When the operating lever 18 is pushed to reset the positioning block 23, it can be directly connected to the thread 151, so that the operating lever 18 does not need to be held when separating the upper steam seal 1 and the lower steam seal 2, which is more convenient.

[0044] Both end faces of the upper steam seal 1 and the lower steam seal 2 have shallow sealing grooves 27 on the side near the inner ring. The shallow sealing grooves 27 are parallel to the axes of the upper steam seal 1 and the lower steam seal 2. A sealing strip 28, which is compressed during the assembly of the upper steam seal 1 and the lower steam seal 2, is embedded in the shallow sealing grooves 27. When the upper steam seal 1 and the lower steam seal 2 are installed together, the sealing strip 28 is compressed, thereby sealing the gap between the upper steam seal 1 and the lower steam seal 2, so as to cooperate with the steam seal and improve the steam seal effect.

[0045] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0047] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A steam seal structure for a steam turbine, characterized in that: The system includes an upper steam seal (1) and a lower steam seal (2) coaxially assembled. The lower steam seal (2) has a vertically positioned positioning pin (21) at the center of its two end faces. The positioning pin (21) has a rotating slot (22) on its two parallel end faces. A positioning block (23) is rotatably connected to the positioning pin (21) within the rotating slot (22). The rotating axis of the positioning block (23) is horizontal. The upper steam seal (1) has a vertically positioned positioning hole (11) at the center of its two end faces for the positioning pin (21) to be inserted. The upper steam seal (1) is positioned within the positioning hole (11). The side wall is provided with a positioning groove (12) for the positioning block (23) to be rotated and inserted. When the positioning pin (21) is inserted into the positioning hole (11), the positioning block (23) rotates and hides into the rotating slot (22). When the positioning pin (21) is fully inserted into the positioning hole (11), the positioning block (23) rotates and partially inserts into the positioning groove (12) to limit the removal of the positioning pin (21). The positioning pin (21) is provided with a compression spring (24) in the rotating slot (22) to push the positioning block (23) into the positioning groove (12).

2. The steam seal structure of the steam turbine as described in claim 1, characterized in that: The upper end of the positioning pin (21) is provided with a pointed cone-shaped guide cone (25).

3. The steam seal structure of the steam turbine as described in claim 2, characterized in that: The lower steam seal (2) has a series of stable cones (26) evenly arranged on the outer periphery of the positioning insert (21) on both end faces, and the upper steam seal (1) has a series of cone grooves (13) evenly arranged on the outer periphery of the positioning insert (11) for the stable cones (26) to be inserted.

4. The steam seal structure of the steam turbine as described in claim 1, characterized in that: The lower end face of the positioning block (23) is an arc surface with its own rotation axis as the center. The lower inner wall of the positioning groove (12) has the same arc as the lower end face of the positioning block (23). The upper steam seal (1) has a guide groove (14) on the lower inner wall of the positioning groove (12) near the positioning hole (11).

5. The steam seal structure of the steam turbine as described in claim 1, characterized in that: The upper steam seal (1) has two parallel side end faces with inclined openings for retraction holes (15) that connect to the positioning groove (12). A retraction rod (16) is inserted into the retraction hole (15). The upper steam seal (1) has a tension spring (17) coaxially fixed in the retraction hole (15) to pull the retraction rod (16) to move away from the positioning groove (12). An operating rod (18) is detachably inserted into the end of the retraction hole (15) away from the positioning groove (12) to push the retraction rod (16) into the positioning groove (12). The retraction rod (16) slides into the positioning groove (12) and pushes the positioning block (23) to rotate and insert back into the rotating slot (22).

6. The steam seal structure of the steam turbine as described in claim 5, characterized in that: The retraction rod (16) is fitted with a ball bearing (161) at one end that abuts against the positioning block (23).

7. The steam seal structure of the steam turbine as described in claim 5, characterized in that: The upper steam seal (1) has a thread (151) coaxially protruding on the inner wall of the retraction hole (15), and the operating rod (18) is positioned and connected to the thread (151) when pushing the retraction insert (16) to the farthest end.

8. The steam seal structure of the steam turbine as described in claim 1, characterized in that: The upper steam seal (1) and the lower steam seal (2) each have a shallow sealing groove (27) on the end face near the inner ring. The shallow sealing groove (27) is parallel to the axis of the upper steam seal (1) and the lower steam seal (2). A sealing strip (28) is embedded in the shallow sealing groove (27) and is pressed during the assembly of the upper steam seal (1) and the lower steam seal (2).

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