Stator blade of steam turbine
By designing the detachable outer and inner ring structures, the problem of the inability to be disassembled and replaced by the existing turbine static vanes is solved, and the rapid replacement and improvement of the static vanes are achieved, and the service life is extended by strengthening the alloy.
Patent Information
- Application Number
- CN202420553915.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-03-21
AI Technical Summary
The static vanes in existing steam turbines cannot be disassembled and replaced after damage, resulting in the need to replace the static vanes as a whole, reducing their effectiveness.
A structure including an outer ring, an inner ring and a static vane is designed, in which a connecting ring is provided inside the inner ring, and the static vane is movably connected to the outside of the connecting ring. The inner ring can be snapped into the inner ring and passes through a clamp and a slot. The spring realizes the removal and replacement of the static vane, and a reinforced alloy is provided behind the static vane to improve corrosion resistance.
Timely disassembly and replacement of static blades is achieved, avoiding the necessity of overall replacement, improving the use effect, and extending the service life by strengthening the alloy.
Smart Images
Figure CN222254087U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of steam turbine stationary blades, and in particular relates to a steam turbine stationary blade. Background Art
[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle and becomes an accelerated airflow, which is then sprayed onto the blades, causing the rotor with the blades to rotate and perform work externally. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power devices.
[0003] The stator blade is abbreviated as the stator blade. It is a stationary blade fixed on the partition or the guide vane holding ring. The stator blade not only guides the steam flow in the steam turbine, but also accelerates the steam. The stator blade in the steam chamber (nozzle chamber) is called a nozzle. The stator blade acts as a guide blade at the speed stage to change the direction of the steam flow into the next row of moving blades. In the reaction steam turbine, the stator blade acts as a nozzle.
[0004] At present, the stator blades used in existing steam turbines are generally installed by welding. This installation method directly fixes the stator blades and guide vane holding rings together, resulting in the inability to disassemble and replace the stator blades after they are damaged. The stator blades need to be replaced as a whole, which reduces their use effect. For this reason, we propose a steam turbine stator blade. Utility Model Content
[0005] The utility model aims to provide a steam turbine stator blade to solve the problem in the above background technology that the stator blade cannot be disassembled and replaced after being damaged, and the stator blade needs to be replaced as a whole, which reduces its use effect.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam turbine stator blade, comprising an outer ring, an inner ring and a stator blade, a connecting ring is provided inside the inner ring, the top and bottom of the connecting ring are fixedly connected with a cross bar, one end of the two cross bars are respectively fixedly connected to the top and bottom of the connecting ring, and the other ends of the two cross bars are fixedly connected to the inner top and inner bottom of the inner ring, the stator blade is movably connected to the outside of the connecting ring, and the inner ring is movably connected to the inside of the outer ring, a clamping groove is provided on the outside of the connecting ring, and the number of the clamping grooves is several, the top of the stator blade is clamped in the inside of the clamping groove, the top and bottom of the inner ring are each provided with a clamping block, and the top and bottom of the outer ring are each provided with a clamping groove, the clamping groove penetrates into the inside of the outer ring, the clamping block is adapted to the clamping groove, and the inner ring is clamped in the inside of the clamping groove through the clamping block.
[0007] Preferably, a fixing ring is provided on the front face of the outer ring, the fixing ring is fixedly connected to the inner wall of the front face of the outer ring, and the fixing ring is located in front of the stationary blades.
[0008] Preferably, a groove is provided at the top and bottom of the inner ring, a spring is provided inside the groove, one end of the spring is fixedly connected inside the groove, and the other end of the spring is fixedly connected to a block, and the block is slidably connected inside the groove.
[0009] Preferably, a reinforcing alloy is provided behind the stationary blade, and the reinforcing alloy is fixedly connected behind the stationary blade.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] 1. Connect the bottom of the stationary blade to the outside of the connecting ring, and insert the inner ring into the outer ring. At this time, the stationary blade is connected. When the stationary blade is damaged, the inner ring is taken out, and then the damaged stationary blade is removed from the connecting ring for replacement. The stationary blade can be disassembled and replaced in time after being damaged, without replacing the entire stationary blade, thereby improving its use effect.
[0012] 2. The provided card block is connected to the inside of the card slot to enhance the stability of the inner ring in the outer ring. By pressing the card block, the spring retracts the card block from the card slot into the groove, and the inner ring can be removed from the outer ring. After that, the spring and the card block are reset, which facilitates the connection and disassembly of the inner ring and the outer ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of the inner ring, outer ring and stationary blades of the utility model;
[0014] Figure 2 This is a schematic diagram of the structure of the clamping block and the inner ring of the utility model;
[0015] Figure 3 It is a schematic diagram of the inner ring and stationary blade structure of the utility model.
[0016] In the figure: 1. outer ring; 2. inner ring; 3. stationary blade; 4. connecting ring; 5. cross bar; 6. snap-in groove; 7. fixing ring; 8. clamping block; 9. clamping groove; 10. groove; 11. spring; 12. reinforcing alloy. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0018] See also Figure 1-3The utility model provides a technical solution for a turbine stator blade: it includes an outer ring 1, an inner ring 2 and a stator blade 3. A connecting ring 4 is provided inside the inner ring 2. A cross bar 5 is fixedly connected to the top and bottom of the connecting ring 4. One end of the two cross bars 5 is fixedly connected to the top and bottom of the connecting ring 4 respectively. The other ends of the two cross bars 5 are fixedly connected to the top and bottom of the inner ring 2. The stator blade 3 is movably connected to the outside of the connecting ring 4. The inner ring 2 is movably connected to the inside of the outer ring 1. A clamping groove 6 is provided on the outside of the connecting ring 4. The number of the clamping grooves 6 is several. The top of the stator blade 3 is clamped in the inside of the clamping groove 6. A clamping block 8 is provided at the top and bottom of the inner ring 2. A clamping groove 9 is provided at the top and bottom of the outer ring 1. The clamping groove 9 penetrates into the inside of the outer ring 1. The clamping block 8 is adapted to the clamping groove 9. The inner ring 2 is clamped in the inside of the clamping groove 9 through the clamping block 8.
[0019] Specifically, a fixing ring 7 is provided on the front side of the outer ring 1 . The fixing ring 7 is fixedly connected to the inner wall of the front side of the outer ring 1 . The fixing ring 7 is located in front of the stationary blade 3 .
[0020] Specifically, a groove 10 is provided at the top and bottom of the inner ring 2, a spring 11 is provided inside the groove 10, one end of the spring 11 is fixedly connected inside the groove 10, and the other end of the spring 11 is fixedly connected to a block 8, and the block 8 is slidably connected inside the groove 10.
[0021] Specifically, a reinforcing alloy 12 is provided behind the stationary blade 3 , and the reinforcing alloy 12 is fixedly connected to the rear of the stationary blade 3 .
[0022] In this embodiment, when the turbine stator blade 3 is used, the outer ring 1, the inner ring 2 and several stator blades 3 are taken out. After taking out, the bottom of the stator blade 3 is connected to the outside of the connecting ring 4. After connection, the inner ring 2 is inserted into the inner ring 1. At this time, the position of the stator blade 3 is clamped. After clamping, it is used. When the stator blade 3 is damaged, the inner ring 2 is taken out, and then the damaged stator blade 3 is removed from the connecting ring 4 for replacement. The stator blade 3 can be disassembled and replaced in time after being damaged, and there is no need to replace the stator blade 3 as a whole, thereby improving its use effect. The provided clamping block 8 is connected to the inside of the clamping groove 9 to enhance the stability of the inner ring 2 in the outer ring 1. By pressing the clamping block 8, the spring 11 is extended and retracted, and the clamping block 8 enters the groove 10 from the clamping groove 9, so that the inner ring 2 can be removed from the outer ring 1. Then the spring 11 and the clamping block 8 are reset, which facilitates the connection and disassembly of the inner ring 2 and the outer ring 1. The provided reinforcing alloy layer 12 can ensure the erosion resistance of the stator blade 3 during use and extend its service life.
[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".
[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A steam turbine stator blade, comprising an outer ring (1), an inner ring (2) and a stator blade (3), characterized in that: A connecting ring (4) is provided inside the inner ring (2). The top and bottom of the connecting ring (4) are fixedly connected with a cross bar (5). One end of the two cross bars (5) is fixedly connected to the top and bottom of the connecting ring (4) respectively. The other ends of the two cross bars (5) are fixedly connected to the top and bottom of the inner ring (2). The stationary blade (3) is movably connected to the outside of the connecting ring (4). The inner ring (2) is movably connected to the inside of the outer ring (1). A clamping groove (6) is provided on the outside of the connecting ring (4). The number of the clamping grooves (6) is several. The top of the stationary blade (3) is clamped inside the clamping groove (6). The top and bottom of the inner ring (2) are provided with a clamping block (8). The top and bottom of the outer ring (1) are provided with a clamping groove (9). The clamping groove (9) penetrates into the inside of the outer ring (1). The clamping block (8) is adapted to the clamping groove (9). The inner ring (2) is clamped inside the clamping groove (9) through the clamping block (8).
2. A steam turbine stator blade according to claim 1, characterized in that: The front face of the outer ring (1) is provided with a fixing ring (7), the fixing ring (7) is fixedly connected to the inner wall of the front face of the outer ring (1), and the fixing ring (7) is located in front of the stationary blade (3).
3. The steam turbine stator blade according to claim 1, characterized in that: A groove (10) is provided at the top and bottom of the inner ring (2), a spring (11) is provided inside the groove (10), one end of the spring (11) is fixedly connected inside the groove (10), and the other end of the spring (11) is fixedly connected to a clamping block (8), and the clamping block (8) is slidably connected inside the groove (10).
4. The steam turbine stator blade according to claim 1, characterized in that: A reinforcing alloy (12) is provided behind the stationary blade (3), and the reinforcing alloy (12) is fixedly connected to the rear of the stationary blade (3).