Low-pressure steam exhaust flow guide ring for steam turbine

Abstract

The utility model relates to the technical field of steam turbines, and discloses a low-pressure steam exhaust flow guide ring for a steam turbine, which comprises a support, a flow guide cover and a sealing element, the support comprises a flange, a butt joint ring and a limit ring, the butt joint ring and the flange are of an integral structure, and the limit ring is positioned on the opposite side of the outer side of the butt joint ring; the flow guide cover is installed on the support in an exchangeable mode, the flow guide cover is formed by butt joint of two semi-ring split bodies, and each semi-ring split body comprises a fixed semi-ring and a flow guide semi-ring which are arranged on the outer side face of the butt joint ring in a sleeving mode and are in butt joint with the limiting ring; the sealing piece comprises a sealing ring A arranged between the flow guide cover and the support and a sealing ring B arranged between the two semi-ring split bodies. By designing the replaceable flow guide cover, a user can replace flow guide covers with different rules according to different working condition requirements so as to achieve the optimal flowing effect and efficiency, channel vortexes can be weakened more effectively, large vortexes can be broken, steam can flow more evenly, therefore, flowing losses are reduced, and the steam exhaust efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, and particularly relates to a low-pressure exhaust guide ring for a steam turbine. Background Technique

[0002] The main function of the low-pressure exhaust guide ring of a steam turbine is to improve the exhaust flow characteristics, reduce the flow loss, and improve the exhaust efficiency. During the operation of the steam turbine, the steam flow inside the exhaust cylinder is complex, and the existence of channel eddies will cause energy loss and efficiency decline. The design and installation of the guide ring can effectively weaken the channel eddies and break large vortices, making the steam flow more uniform, thereby improving the aerodynamic performance of the exhaust cylinder and increasing the efficiency of the steam turbine.

[0003] In the prior art, the guide cover or guide plate in the low-pressure exhaust guide ring for a steam turbine is the part that directly affects the flow characteristics in the guide ring. Different shapes, sizes, and guide angles can all affect the guiding effect. At present, the guide cover or guide plate in the low-pressure exhaust guide ring for a steam turbine is mostly fixed, and the guide cover or guide plate is fixedly connected to the support in an integrated manner, which cannot be adjusted or replaced and cannot adapt to the flow requirements under different working conditions.

[0004] In view of this, we propose a low-pressure exhaust guide ring for a steam turbine. Content of the Utility Model

[0005] The present invention aims to solve the technical problem that in the above-mentioned prior art, the guide cover or guide plate is fixedly connected to the support in an integrated manner, which cannot be adjusted or replaced and cannot adapt to the flow requirements under different working conditions.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A low-pressure exhaust guide ring for a steam turbine, comprising a support, a guide cover, and a seal. The support includes a flange, a docking ring integrated with the flange, and a limit ring located on the outer side opposite to the docking ring; the guide cover is adjustably installed on the support, and the guide cover is formed by split docking of two half rings. Each half ring includes a fixed half ring sleeved on the outer side of the docking ring and docked with the limit ring, and a guiding half ring; the seal includes a sealing ring A disposed between the guide cover and the support and a sealing ring B between the two half rings.

[0008] By designing an interchangeable guide cover, users can replace guide covers of different rules according to different working conditions to achieve the best flow effect and efficiency. This is crucial for the turbine to maintain efficient operation under different working conditions. The guide half ring of the guide cover can be designed with different expansion hole sizes, shapes and angles as needed, which can more effectively weaken the channel vortex, break up large vortices, make the steam flow more uniform, thereby reducing flow losses and improving exhaust efficiency.

[0009] Preferably, the outer side surface of the limiting ring is provided with connecting blocks connected to the flange arranged in a circular shape with equal distances, and the connecting blocks are provided with lifting holes.

[0010] Lifting holes allow the shroud to be quickly positioned and installed using lifting equipment.

[0011] Preferably, an annular groove for accommodating a sealing gasket is formed on a side of the flange facing away from the docking ring.

[0012] Preferably, a docking half ring is provided on the bottom outer edge of the fixing half ring, and the air deflector is fixed to the support by bolts penetrating the docking half ring and the limiting ring.

[0013] The fixed half ring of the fairing is connected to the limit ring by bolts and then fixed to the connecting ring. This design enhances the connection stability between the fairing and the support and ensures that the fairing will not shift during the operation of the turbine.

[0014] Preferably, a butt-jointed block protruding outward is fixed to the butt-jointed ends of the two half-ring parts, and the two half-ring parts are butt-jointed and fixed together by bolts penetrating the butt-jointed block.

[0015] The outward protruding design of the docking block increases the contact area between the two half-ring parts. After being tightened by bolts, it can provide higher connection strength and ensure the stability and durability of the fairing during the operation of the turbine.

[0016] Preferably, the sealing ring A comprises a sealing vertical ring covering the outer side of the docking ring and a sealing horizontal ring located above the limiting ring, which effectively prevents steam leakage and improves the operating efficiency and safety of the steam turbine.

[0017] Preferably, the outer sides of the two half-ring parts are evenly distributed with a plurality of reinforcing ribs, thereby increasing the structural strength of the fairing.

[0018] Compared with the prior art, the technical effects and advantages of the present utility model are as follows: For the low-pressure exhaust gas guide ring of the steam turbine, the fixed semi-ring of the guide cover is docked with the limit ring through bolts and then fixed with the docking ring, enhancing the connection stability between the guide cover and the support, and ensuring that the guide cover will not shift during the operation of the steam turbine. When it is necessary to adjust or replace the guide cover, only the bolts need to be disassembled to achieve rapid replacement, improving the maintenance flexibility and economy of the equipment.

[0019] The outward protruding design of the docking block increases the contact area between the two semi-ring parts. After being fastened by bolts, it can provide higher connection strength, ensuring the stability and durability of the guide cover during the operation of the steam turbine. It makes the docking between the two semi-ring parts more precise and easier, facilitating assembly and adjustment, and also providing convenience for subsequent maintenance and replacement.

[0020] The sealing vertical ring and the sealing horizontal ring together constitute an all-round sealing system, effectively preventing steam leakage, and improving the operation efficiency and safety of the steam turbine. The good sealing performance reduces the loss of fluid during the guiding process, improves the exhaust efficiency, thereby saving energy and reducing the operation cost.

[0021] By designing a replaceable guide cover, users can replace guide covers with different rules according to different working conditions to achieve the best flow effect and efficiency. The guide semi-ring can be designed with different reaming sizes, shapes and angles according to needs, thereby reducing the flow loss and improving the exhaust efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the present utility model;

[0023] Figure 2 is an exploded view of the present utility model;

[0024] Figure 3 is a structural schematic diagram of the support of the present utility model;

[0025] Figure 4 is a structural schematic diagram of the sealing ring A of the present utility model;

[0026] Figure 5 is a structural schematic diagram of the semi-ring part of the present utility model.

[0027] In the figure: 1. Support; 101. Flange; 102. Docking ring; 103. Limit ring; 104. Connection block; 105. Lifting hole; 106. Annular groove; 2. Guide cover; 3. Semi-ring part; 31. Fixed semi-ring; 32. Guide semi-ring; 33. Docking semi-ring; 34. Docking block; 35. Reinforcing rib; 41. Sealing ring A; 4101. Sealing vertical ring; 4102. Sealing horizontal ring; 42. Sealing ring B. Detailed implementation mode

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] The following will be further described in detail in conjunction with the attached Figures 1-5 This application will be further described in detail.

[0030] The embodiment of this application discloses a low-pressure exhaust gas guide ring for a steam turbine, which includes a support 1, a guide cover 2 and a seal 4. The support 1 includes a flange 101, a docking ring 102 integrated with the flange 101, and a limit ring 103 located on the outer side opposite to the docking ring 102. The outer side of the limit ring 103 is provided with connecting blocks 104 that connect it to the flange 101 at equal intervals in a circular arrangement, and the connecting blocks 104 are provided with lifting holes 105.

[0031] The lifting holes 105 allow the use of lifting equipment to quickly position and install the guide cover 2, greatly improving the installation efficiency and safety. The design of the connecting blocks 104 makes it more convenient and fast to maintain or replace the guide cover 2, because it can be quickly and accurately positioned and disassembled.

[0032] On the side of the flange 101 facing away from the docking ring 102, a circular groove 106 for placing a gasket is provided.

[0033] The design of the circular groove 106 provides an accurate position for placing the gasket, ensuring the integrity of the seal and reducing the possibility of leakage, and improving the operating efficiency and safety of the steam turbine. Due to the existence of the groove, the gasket can be directly placed in place during installation, avoiding blind searching and adjustment on the plane and simplifying the installation process.

[0034] The guide cover 2 is adjustably installed on the support 1. The guide cover 2 is formed by docking two semi-ring parts 3. Each semi-ring part 3 includes a fixed semi-ring 31 sleeved on the outer side of the docking ring 102 and docked with the limit ring 103, and a guide semi-ring 32.

[0035] A docking semi-ring 33 is provided at the bottom outer edge of the fixed semi-ring 31, and the guide cover 2 is fixed on the support 1 by bolts passing through the docking semi-ring 33 and the limit ring 103.

[0036] The fixed half-ring 31 of the fairing 2 is docked with the limit ring 103 through bolts and then fixed to the docking ring 102. Such a design enhances the connection stability between the fairing 2 and the support 1, ensuring that the fairing 2 will not shift during the operation of the steam turbine. The fixed connection method enables quick replacement by simply removing the bolts when the fairing 2 needs to be adjusted or replaced, improving the maintenance flexibility and economy of the equipment.

[0037] The docking ends of the two half-ring bodies 3 are fixed with docking blocks 34 protruding outward. The two half-ring bodies 3 are docked and fixed together by bolts passing through the docking blocks 34.

[0038] The outward protruding design of the docking blocks 34 increases the contact area between the two half-ring bodies 3. After being fastened by bolts, it can provide higher connection strength, ensuring the stability and durability of the fairing 2 during the operation of the steam turbine. The design of the docking blocks 34 and the bolts makes the docking between the two half-ring bodies 3 more precise and easier, facilitating assembly and adjustment, and also providing convenience for subsequent maintenance and replacement.

[0039] A number of reinforcing ribs 35 are evenly distributed on the outer sides of the two half-ring bodies 3.

[0040] The design of the reinforcing ribs 35 increases the structural strength of the fairing 2, making the fairing 2 more stable when bearing the high-temperature and high-pressure environment inside the steam turbine, reducing deformation and damage caused by vibration or pressure. The presence of the reinforcing ribs 35 extends the service life of the fairing 2, improves durability, and reduces failures and replacement frequencies caused by material fatigue.

[0041] The seal 4 includes a seal ring A41 between the fairing 2 and the support 1 and a seal ring B42 between the two half-ring bodies 3. The seal ring A41 includes a sealing vertical ring 4101 covering the outer side of the docking ring 102 and a sealing horizontal ring 4102 located above the limit ring 103.

[0042] The sealing vertical ring 4101 and the sealing horizontal ring 4102 together form an all-round sealing system, effectively preventing steam leakage, improving the operation efficiency and safety of the steam turbine. Good sealing performance reduces the loss of fluid during the diversion process, improves the exhaust efficiency, thereby saving energy and reducing operating costs.

[0043] Two semi-circular split parts 3 on the fairing 2 are sleeved on the outer side of the docking ring 102 through the fixed semi-ring 31 and docked with the limiting ring 103. The reaming size, shape and angle of the diversion semi-ring 32 can be designed into different rules according to needs. In this way, the channel vortex can be more effectively weakened, large vortices can be broken, and the steam flow can be made more uniform, thereby reducing the flow loss and improving the exhaust efficiency. The size of the fixed semi-ring 31 is fixed, and the fairing 2 with different rules can be replaced and installed on the support 1 to adapt to the flow requirements under different working conditions, improve the overall performance of the steam turbine, and achieve the best flow effect and efficiency;

[0044] The support 1 is installed in cooperation with the fairing 2, and the support 1 can ensure the stability and durability of the fairing 2 during the operation of the steam turbine.

[0045] By designing the replaceable fairing 2, users can replace the fairing 2 with different rules according to different working condition requirements to achieve the best flow effect and efficiency. This is crucial for the steam turbine to maintain efficient operation in different working states. The diversion semi-ring 32 of the fairing 2 can be designed into different reaming sizes, shapes and angles according to needs, so that the channel vortex can be more effectively weakened, large vortices can be broken, and the steam flow can be made more uniform, thereby reducing the flow loss and improving the exhaust efficiency.

[0046] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-pressure exhaust gas guide ring for a steam turbine, characterized in that, include: A support (1), the support (1) comprising a flange (101), a docking ring (102) which is an integral structure with the flange (101), and a limiting ring (103) located opposite to the outer side of the docking ring (102); A deflector (2), the deflector (2) is replaceably mounted on the support (1), the deflector (2) is formed by two half-ring parts (3) connected together, each half-ring part (3) comprises a fixed half-ring (31) sleeved on the outer side of the butt ring (102) and connected to the limit ring (103), and a deflector half-ring (32); The sealing member (4) comprises a sealing ring A (41) arranged between the air guide cover (2) and the support (1) and a sealing ring B (42) between the two half-ring parts (3).

2. The low-pressure exhaust steam guide ring for a steam turbine according to claim 1, wherein: The outer side surface of the limiting ring (103) is provided with connecting blocks (104) connected to the flange (101) arranged in an annular manner and at equal intervals, and the connecting blocks (104) are provided with lifting holes (105).

3. The low-pressure exhaust steam guide ring for a steam turbine according to claim 1, characterized in that: An annular groove (106) for accommodating a sealing gasket is provided on a side of the flange (101) facing away from the docking ring (102).

4. The low-pressure exhaust gas guide ring for a steam turbine according to claim 1, characterized in that: A docking half ring (33) is provided at the bottom outer edge of the fixing half ring (31), and the air deflector (2) is fixed to the support (1) by bolts penetrating the docking half ring (33) and the limiting ring (103).

5. A low-pressure exhaust gas guide ring for a steam turbine according to claim 1, characterized in that: A butt joint block (34) protruding outward is fixed to the butt joint ends of the two semi-ring parts (3), and the two semi-ring parts (3) are butt jointed and fixed together by bolts penetrating the butt joint block (34).

6. The low-pressure exhaust steam guide ring for a steam turbine according to claim 1, characterized in that: The sealing ring A (41) comprises a sealing vertical ring (4101) covering the outer side of the docking ring (102) and a sealing horizontal ring (4102) located above the limiting ring (103).

7. The low-pressure exhaust gas guide ring for a steam turbine according to claim 1, characterized in that: A plurality of reinforcing ribs (35) are evenly distributed on the outer side surfaces of the two semi-ring parts (3).

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