Sealing structure of steam admission insertion pipe of steam turbine

Abstract

The utility model relates to the field of steam turbine steam admission sealing, and discloses a steam turbine steam admission insertion pipe sealing structure which comprises a steam turbine shell, fixing plates are fixedly installed on the left side and the right side of the steam turbine shell correspondingly, and a steam guide shell is fixedly installed on the sides, away from the steam turbine shell, of the fixing plates. A steam guide pipe is fixedly installed on the outer surface of the steam guide shell, firstly, a connecting sealing pipe is inserted into the steam guide pipe by a person, at the moment, the outer surface of a second sealing ring is clamped into a circular clamping groove, and therefore when the connecting sealing pipe is heated to expand and expands outwards, the second sealing ring can completely fill the interior of the circular clamping groove, and the sealing performance is enhanced; according to the device, a plurality of circular grooves are formed in the outer surface of the connecting sealing pipe, the second sealing rings are clamped in the circular grooves, the limiting effect on the second sealing rings is achieved, the second sealing rings cannot move when the connecting sealing pipe is inserted into the steam guide pipe, and high-temperature and high-pressure steam can be prevented from overflowing from the space between the steam guide pipe and the connecting sealing pipe through the first sealing rings and the second sealing rings; the sealing effect is improved.

Description

Technical Field

[0001] This application belongs to the field of steam turbine inlet sealing technology, specifically a steam turbine inlet pipe sealing structure. Background Technology

[0002] The steam turbine inlet pipe is a pipeline component that connects the main steam pipeline and the steam turbine cylinder. Its main function is to safely and reliably deliver high-temperature and high-pressure steam to the steam turbine and to regulate the steam flow. It typically includes components such as valves, temperature sensors, and pressure sensors to control and monitor steam parameters, ensuring the safe and stable operation of the steam turbine.

[0003] For example, the utility model patent with announcement number CN221462382U discloses a steam turbine inlet pipe sealing structure, including a steam guide pipe with an inlet groove inside, an inlet pipe inserted into the inlet groove, and a sealing assembly sleeved on the outer circumferential surface of the inlet pipe and located in the annular cavity between the inlet pipe and the steam guide pipe. The sealing assembly includes multiple sealing rings and guide rings arranged alternately along the insertion direction of the inlet pipe. The circumferential length of the sealing ring can change with the deformation of the inlet pipe. When the inlet pipe expands, the sealing ring can change with the outer diameter of the inlet pipe to prevent the two from seizing together and reduce steam leakage. Especially when the inlet pipe develops elliptical deformation after many years of unit operation, it can be adapted to the deformed inlet pipe to avoid gaps. This effectively prevents high-pressure steam from leaking into the high-pressure outer cylinder, causing overheating of the high-pressure outer cylinder and steam leakage at the split surface, thereby ensuring the safe operation of the steam turbine unit.

[0004] However, in actual use, it was found that the device mainly reduces steam leakage from the high-pressure steam inlet to the low-pressure steam outlet by using a sealing ring and a guide ring fitted on the outer surface of the steam inlet pipe, thereby ensuring the safe operation of the unit and preventing energy waste.

[0005] However, since the low-pressure steam outlet is used to discharge the low-pressure steam after the turbine has done its work, it is mostly located on the exhaust end because the steam pressure is lower at the exhaust end and it is easier to discharge. However, when this structure is used on the high-temperature and high-pressure steam inlet pipe, there is a problem that the high-pressure and high-temperature steam can easily be discharged through the low-pressure steam outlet. In addition, the sealing ring and guide ring lack effective limiting, which causes the sealing ring to easily shift when the steam inlet pipe is inserted into the steam pipe, affecting the sealing effect and thus reducing operational safety and energy efficiency. Therefore, a steam turbine steam inlet pipe sealing structure is provided. Utility Model Content

[0006] The purpose of this application is to provide a steam turbine inlet pipe sealing structure in order to solve the problems mentioned above.

[0007] The technical solution adopted in this application is as follows: A steam turbine inlet pipe sealing structure includes a steam turbine casing, fixed plates are fixedly installed on the left and right sides of the steam turbine casing, a steam guide casing is fixedly installed on the side of the fixed plate away from the steam turbine casing, a steam guide pipe is fixedly installed on the outer surface of the steam guide casing, a connecting sealing pipe is provided inside the steam guide pipe, a fixing mechanism connected to the steam guide pipe is provided on the outer surface of the connecting sealing pipe, an inlet pipe is fixedly installed at one end of the connecting sealing pipe, and a sealing mechanism is provided on the outer surface of the connecting sealing pipe;

[0008] The sealing mechanism includes a circular groove, a first sealing ring, a second sealing ring, and a circular retaining groove. The inner bottom surface of the steam guide pipe has a circular groove. The end of the connecting sealing pipe away from the air inlet pipe is inserted into the inside of the circular groove. The first sealing ring is fixedly installed inside the circular groove. The outer surface of one end of the connecting sealing pipe is in contact with the inner wall of the first sealing ring. Multiple second sealing rings are fitted on the outer surface of the connecting sealing pipe. Multiple circular retaining grooves corresponding to the second sealing rings are opened on the inner wall of the steam guide pipe. The outer surface of the second sealing ring is engaged inside the circular retaining groove.

[0009] In a preferred embodiment, a drive shaft is rotatably connected inside the turbine casing, and multiple moving blades are evenly arrayed on the outer surface of the drive shaft. A drive gear is fixedly installed at one end of the drive shaft.

[0010] In a preferred embodiment, the fixing mechanism includes a circular sealing plate, fixing bolts, and threaded holes. The circular sealing plate is fixedly installed on the outer surface of the connecting sealing pipe. One side of the circular sealing plate is in contact with one end of the steam guide pipe. Multiple fixing bolts are movably passed through the outer surface of the circular sealing plate. Multiple threaded holes corresponding to the fixing bolts are opened at one end of the steam guide pipe near the circular sealing plate. One end of the fixing bolt is threaded into the inside of the threaded hole.

[0011] In a preferred embodiment, a sealing guide sleeve is movably fitted onto the outer surface of the connecting sealing tube.

[0012] In a preferred embodiment, an exhaust port is provided on the outer surface of the turbine casing.

[0013] In a preferred embodiment, two support base plates are fixedly installed on the bottom surface of the turbine casing.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this application are:

[0015] 1. In this application, due to the adoption of the above-mentioned scheme, the personnel first insert the connecting sealing tube into the steam pipe. After the connecting sealing tube is fully inserted into the steam pipe, the outer surface of the second sealing ring is engaged in the circular groove. In this way, when the connecting sealing tube expands outward due to heat, the second sealing ring can completely fill the circular groove, further enhancing the sealing performance. The outer surface of the connecting sealing tube of this device has multiple circular grooves. The second sealing ring is engaged in the circular grooves, which limit the movement of the second sealing ring, so that the second sealing ring will not move when the connecting sealing tube is inserted into the steam pipe. Moreover, the first sealing ring and the second sealing ring can improve the sealing performance between the connecting sealing tube and the steam pipe, prevent high-temperature and high-pressure steam from overflowing from the steam pipe and the connecting sealing tube, and improve the sealing effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this application;

[0017] Figure 2 This is a schematic diagram of the side section structure of the steam pipe in this application;

[0018] Figure 3 For the purposes of this application Figure 2 Enlarged structural diagram at point A in the middle;

[0019] Figure 4 This is a schematic diagram of the steam guide shell structure before installation in this application;

[0020] Figure 5 This is a schematic diagram of the moving blade structure of this application.

[0021] The markings in the diagram are: 1. Turbine casing; 2. Fixing plate; 3. Steam guide casing; 4. Steam guide pipe; 5. Connecting sealing pipe; 6. Fixing mechanism; 7. Inlet pipe; 8. Sealing structure; 801. Circular groove; 802. Sealing ring one; 803. Sealing ring two; 804. Circular slot; 9. Transmission shaft; 10. Moving blade; 11. Transmission gear; 12. Circular sealing plate; 13. Fixing bolt; 14. Threaded hole; 15. Sealing guide sleeve; 16. Exhaust port; 17. Support base plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] refer to Figures 1-5A steam turbine inlet pipe sealing structure includes a steam turbine casing 1, an exhaust port 16 on the outer surface of the steam turbine casing 1, and two support base plates 17 fixedly installed on the bottom surface of the steam turbine casing 1. The support base plates 17 facilitate the support of the steam turbine casing 1 and improve its stability, while the exhaust port 16 facilitates the discharge of steam after work.

[0024] refer to Figure 2 , Figure 3 and Figure 4 Fixed plates 2 are fixedly installed on the left and right sides of the turbine casing 1, respectively. A steam guide casing 3 is fixedly installed on the side of the fixed plate 2 away from the turbine casing 1. A steam guide pipe 4 is fixedly installed on the outer surface of the steam guide casing 3. The fixed plates 2 facilitate the installation and fixing of the steam guide casing 3. The steam guide pipe 4 facilitates the entry of high-temperature and high-pressure steam from the outside into the turbine casing 1. The steam guide pipe 4 is provided with a steam inlet groove to facilitate better gas entry.

[0025] refer to Figure 2 , Figure 3 and Figure 4 The steam pipe 4 has a connecting sealing pipe 5 inside. The outer surface of the connecting sealing pipe 5 has a fixing mechanism 6 that connects to the steam pipe 4. One end of the connecting sealing pipe 5 is fixedly installed with an air inlet pipe 7. The outer surface of the connecting sealing pipe 5 has a sealing mechanism 8. A sealing guide sleeve 15 is movably sleeved on the outer surface of the connecting sealing pipe 5. The connecting sealing pipe 5 is inserted into the steam pipe 4 and is limited and fixed by the fixing mechanism 6. The setting of the air inlet pipe 7 allows external steam to enter the interior of the turbine casing 1. The sealing mechanism 8 facilitates the sealing of the connection between the connecting sealing pipe 5 and the steam pipe 4, so that steam will not leak.

[0026] refer to Figure 2 , Figure 3 and Figure 4 The sealing mechanism 8 includes a circular groove 801, a first sealing ring 802, a second sealing ring 803, and a circular slot 804. The inner bottom surface of the steam pipe 4 has a circular groove 801. The end of the connecting sealing pipe 5 away from the air inlet pipe 7 is inserted into the inside of the circular groove 801. The first sealing ring 802 is fixedly installed inside the circular groove 801. The outer surface of one end of the connecting sealing pipe 5 is in contact with the inner wall surface of the first sealing ring 802. The inner diameter of the circular groove 801 is larger than the outer diameter of the connecting sealing pipe, which makes it easier for one end of the connecting sealing pipe to be inserted into it. When the connecting sealing pipe 5 is inserted into the inside of the circular groove 801, the first sealing ring 802 will contact its side, which helps to improve the sealing performance at the connection between the connecting sealing pipe 5 and the steam pipe 4.

[0027] refer to Figure 2 , Figure 3 and Figure 4Multiple sealing rings 803 are fitted on the outer surface of the connecting sealing pipe 5. Multiple circular grooves 804 corresponding to the sealing rings 803 are opened on the inner wall of the steam pipe 4. The outer surface of the sealing rings 803 is engaged inside the circular grooves 804. Multiple circular grooves are opened on the outer surface of the connecting sealing pipe 5. The sealing rings 803 are engaged in the circular grooves for easy positioning. When the connecting sealing pipe 5 is inserted into the steam pipe 4, the sealing rings 803 will not move. When the connecting sealing pipe 5 is fully inserted into the steam pipe 4, the outer surface of the sealing rings 803 is engaged inside the circular grooves 804. Thus, when the connecting sealing pipe 5 expands outward due to heat, the sealing rings 803 can completely fill the circular grooves 804, which helps to further enhance the sealing performance.

[0028] refer to Figure 2 , Figure 4 and Figure 5 A drive shaft 9 is rotatably connected inside the turbine casing 1. Multiple moving blades 10 are evenly spaced and arranged on the outer surface of the drive shaft 9. A drive gear 11 is fixedly installed at one end of the drive shaft 9. After high-temperature and high-pressure steam enters the turbine casing 1 through the steam pipe 4, it impacts the moving blades 10 installed on the turbine rotor, causing the rotor to rotate. The kinetic energy of the steam is converted into the mechanical energy of the rotor, and then output through the drive gear 11 to facilitate the subsequent driving of other transmission equipment.

[0029] refer to Figure 2 , Figure 3 and Figure 4 The fixing mechanism 6 includes a circular sealing plate 12, fixing bolts 13, and threaded holes 14. The circular sealing plate 12 is fixedly installed on the outer surface of the connecting sealing pipe 5. One side of the circular sealing plate 12 is in contact with one end of the steam pipe 4. Multiple fixing bolts 13 are movably inserted through the outer surface of the circular sealing plate 12. Multiple threaded holes 14 corresponding to the fixing bolts 13 are opened at one end of the steam pipe 4 near the circular sealing plate 12. One end of the fixing bolt 13 is threaded into the inside of the threaded hole 14. The circular sealing plate 12 and fixing bolts 13 facilitate the installation and fixing of the connecting sealing pipe 5, and improve the stability between the connecting sealing pipe 5 and the steam pipe 4.

[0030] The implementation principle of the turbine inlet pipe sealing structure embodiment of this application is as follows: The operator first inserts the connecting sealing pipe 5 into the steam pipe 4. When the connecting sealing pipe 5 is fully inserted, its bottom end will be inserted into the circular groove 801. At this time, the sealing ring 802 contacts the side of the connecting sealing pipe 5, which can improve the sealing performance at the connection between the connecting sealing pipe 5 and the steam pipe 4. Multiple circular grooves are opened on the outer surface of the connecting sealing pipe 5. The sealing ring 803 is engaged in the circular groove, which plays a limiting role for the sealing ring 803, so that the sealing ring 803 does not move when the connecting sealing pipe 5 is inserted into the steam pipe 4.

[0031] After the connecting sealing pipe 5 is fully inserted into the steam pipe 4, the outer surface of the second sealing ring 803 is engaged with the circular groove 804. When the connecting sealing pipe 5 expands outward due to heat, the second sealing ring 803 can completely fill the circular groove 804, further enhancing the sealing performance. Then, the operator uses the circular sealing plate 12 in the fixing mechanism 6 and the fixing bolts 13 to fix the connecting sealing pipe 5, so that the connecting sealing pipe 5 and the steam pipe 4 are tightly connected, improving stability. At this time, high-temperature and high-pressure steam enters the turbine casing 1 through the inlet pipe 7, the connecting sealing pipe 5, and the steam pipe 4. The overall sealing structure of this device is easy to operate and install. The first sealing ring 802 and the second sealing ring 803 can improve the sealing performance between the connecting sealing pipe 5 and the steam pipe 4, preventing high-temperature and high-pressure steam from overflowing from the steam pipe 4 and the connecting sealing pipe 5, thus improving the sealing effect.

[0032] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A steam turbine inlet pipe sealing structure, comprising a steam turbine casing (1), characterized in that: Fixed plates (2) are fixedly installed on the left and right sides of the turbine casing (1). A steam guide casing (3) is fixedly installed on the side of the fixed plate (2) away from the turbine casing (1). A steam guide pipe (4) is fixedly installed on the outer surface of the steam guide casing (3). A connecting sealing pipe (5) is provided inside the steam guide pipe (4). A fixing mechanism (6) connected to the steam guide pipe (4) is provided on the outer surface of the connecting sealing pipe (5). An air inlet pipe (7) is fixedly installed at one end of the connecting sealing pipe (5). A sealing mechanism (8) is provided on the outer surface of the connecting sealing pipe (5). The sealing mechanism (8) includes a circular groove (801), a first sealing ring (802), a second sealing ring (803), and a circular slot (804). The bottom surface of the steam pipe (4) is provided with a circular groove (801). One end of the connecting sealing pipe (5) away from the air inlet pipe (7) is inserted into the inside of the circular groove (801). The first sealing ring (802) is fixedly installed inside the circular groove (801). The outer surface of one end of the connecting sealing pipe (5) is in contact with the inner wall of the first sealing ring (802). Multiple second sealing rings (803) are sleeved on the outer surface of the connecting sealing pipe (5). Multiple circular slots (804) corresponding to the second sealing rings (803) are provided on the inner wall of the steam pipe (4). The outer surface of the second sealing ring (803) is engaged inside the circular slot (804).

2. The steam turbine inlet pipe sealing structure as described in claim 1, characterized in that: The turbine casing (1) is rotatably connected to a drive shaft (9). Multiple moving blades (10) are installed in an equally spaced array on the outer surface of the drive shaft (9). A drive gear (11) is fixedly installed at one end of the drive shaft (9).

3. The steam turbine inlet pipe sealing structure as described in claim 1, characterized in that: The fixing mechanism (6) includes a circular sealing plate (12), fixing bolts (13) and threaded holes (14). The circular sealing plate (12) is fixedly installed on the outer surface of the connecting sealing pipe (5). One side of the circular sealing plate (12) is in contact with one end of the steam pipe (4). Multiple fixing bolts (13) are movably passed through the outer surface of the circular sealing plate (12). Multiple threaded holes (14) corresponding to the fixing bolts (13) are opened at one end of the steam pipe (4) near the circular sealing plate (12). One end of the fixing bolt (13) is threaded into the inside of the threaded hole (14).

4. The steam turbine inlet pipe sealing structure as described in claim 1, characterized in that: A sealing guide sleeve (15) is movably fitted on the outer surface of the connecting sealing tube (5).

5. The steam turbine inlet pipe sealing structure as described in claim 1, characterized in that: The outer surface of the turbine casing (1) is provided with an exhaust port (16).

6. The steam turbine inlet pipe sealing structure as described in claim 1, characterized in that: Two support base plates (17) are fixedly installed on the bottom surface of the turbine casing (1).

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