Steam turbine admission structure

Abstract

This invention provides a steam turbine inlet structure, relating to the field of steam turbine components, comprising: a connecting flange, on the outside of which are fixed annularly arranged steam guide plates, the steam guide plates being arc-shaped plate structures; a disassembly puller mounted on the connecting flange via an adjusting guide frame; the disassembly puller being connected to a freely sliding connecting plug via a guide assembly; and a triangular block for force displacement on the outer side of the connecting plug. After the connecting flange is connected to the steam inlet pipeline, a connecting shaft replaces bolts for positioning and connection. The connection is moved downwards via the connecting plug and the disassembly assembly, improving the convenience of assembly and disassembly. In case of steam leakage, the steam guide plates block the steam and change its direction, discharging it laterally through the arc-shaped groove, preventing injury to personnel approaching the site. This solves the problem of cumbersome connections between common steam turbine inlet structures and inlet pipelines, and the risk of injury to personnel if steam leaks at the inlet location.

Description

Technical Field

[0001] This invention relates to the field of steam turbine components technology, and in particular to a steam turbine inlet structure. Background Technology

[0002] A steam turbine, also known as a steam turbine engine, pressurizes external high-temperature, high-pressure steam and injects it onto the blades, causing the rotor equipped with rows of blades to rotate and generate rotational power to produce electricity. When steam enters, it first passes through the steam inlet structure, and after being diverted by the steam inlet structure, the steam is then distributed and transported. The steam inlet structure of common steam turbines on the market is quite cumbersome to connect to the steam inlet pipe, and disassembly and maintenance require loosening bolts one by one, which is quite laborious. Furthermore, when the sealing strength of the steam inlet position decreases, steam will leak, which may cause injury to workers if they are near it. After the steam enters the steam inlet structure, it will generate a certain impact force when turning, affecting the overall stability. During the continuous operation of the steam turbine, it will generate a lot of vibration and roaring noise. The vibration will be transmitted to the steam inlet structure and may cause leakage at the connection between the steam turbine and the steam inlet structure. Summary of the Invention

[0003] In view of this, the present invention provides a steam turbine inlet structure to solve the problems of common steam turbine inlet structures, which are cumbersome to connect with the inlet pipe, require loosening bolts one by one during disassembly and repair, are laborious, and cause steam leakage when the sealing strength of the inlet position decreases, which may lead to injury to workers if they get close.

[0004] This invention provides a steam turbine inlet structure, specifically comprising: an inlet structure; an L-shaped tubular inlet structure with two branch pipes at its bottom, characterized in that a top insert pipe for steam transmission is inserted into the bottom end of the inlet structure and into each branch pipe, the diameter of the top insert pipe being 5 cm smaller than the diameter of the bottom end of the inlet structure and the diameters of the two branch pipes; a flexible metal guide expansion port is fixed at the top of the top insert pipe, the funnel-shaped guide expansion port fitting against the inner wall of the bottom end of the inlet structure and the branch pipes; and a collar, which is fitted and fixed to the outside of the inlet structure, the collar being secured by a support plate and an insert pipe. The inlet assembly is connected to a freely retractable movable rod, the inner end of which is fixedly connected to the flow guiding assembly and drives the flow guiding assembly to move together; a connecting flange is welded and fixed to the steam inlet end of the steam inlet structure and connected to the steam inlet pipeline. A ring of steam guide plates is fixed to the outside of the connecting flange. The steam guide plates are arc-shaped plate structures. The inside of the steam guide plates is provided with arc-shaped grooves for controlling the flow of steam. The connecting flange is equipped with a disassembly puller through an adjusting guide frame. The disassembly puller is connected to a connecting plug that can slide freely left and right through a guide assembly. The outside of the connecting plug is provided with a triangular block for force displacement.

[0005] Optionally, a heat exchange component is fixed at the steam inlet end of the steam inlet structure. The outer end of the heat exchange component, which has a conical structure, is connected to a liquid inlet pipe and a liquid outlet pipe on both sides. The liquid inlet pipe and the liquid outlet pipe penetrate the steam inlet structure and are located outside the steam inlet structure. The bottom end of the steam inlet structure and the bottom end of the branch pipe are provided with annularly arranged bolt connection holes. The diameter of the bolt connection holes is 1 cm larger than the diameter of the fixing bolts. A positioning baffle for auxiliary sealing is respectively fitted to the bottom end of the steam inlet structure and the bottom end of the branch pipe and slides freely at the bottom end of the steam inlet structure and the bottom end of the branch pipe. An annularly arranged outer rod is fixed to the outside of the annularly structured positioning baffle. A bottom insertion pipe inserted into the steam turbine is fixed to the bottom of the positioning baffle. An annularly arranged auxiliary rod is fixed to the bottom of the flow guide expansion port. The bottom end of the elastic metal auxiliary rod is a spherical structure.

[0006] Optionally, a support plate is fixed above the rear end of the collar for force support, and an insertion component inserted into the steam inlet structure is fixed on the inner side of the support plate; the insertion component is provided with a telescopic groove for guiding movement, and a moving rod is installed inside the telescopic groove of the U-shaped shaft structure by a spring, and the inner end of the moving rod and the guide component are located in the steam turning position inside the steam inlet structure.

[0007] Optionally, a circular positioning guide ring is fixed to the outer side of the connecting flange. The positioning guide ring is inserted into the steam inlet pipe for positioning. A ring of circular holes is fixed to the outer side of the connecting flange, and the circular holes correspond to the bolt holes of the steam inlet pipe. An annular adjusting guide frame is fixed to the outer side of the connecting flange. A cylindrical connecting shaft is inserted into the circular hole of the connecting flange. The connecting shaft is simultaneously inserted into the threaded hole of the steam inlet pipe for positioning. Each connecting shaft has a rectangular groove for fixing at its inner end. Each connecting shaft has a force-bearing slot with an inclined outer side at its outer end. The force-bearing slot contains both a connector and a triangular block. The outer side of the force-bearing slot contacts the inclined side of the triangular block and slides. The side of the adjusting guide frame is equipped with a disassembly puller that can move freely up and down. The bottom end of the disassembly puller is inserted into the rectangular groove of the connecting shaft and fixes the connecting shaft. The side of the disassembly puller is fixed with a round rod that can be freely pulled out and inserted inside the adjusting guide frame. A spring is fitted on the outside of the round rod. The outside of the disassembly puller is fixedly connected to the guide assembly. The guide assembly is fitted on the outside of the round rod and slides freely. The top end of the guide assembly contacts the spring and is pushed by the spring to move.

[0008] The steam turbine inlet structure provided by this invention has the following beneficial effects:

[0009] 1. After the turbine vibration is transmitted, the guide expansion port uses its own elasticity to buffer and initially reduce the impact force. At the same time, the positioning baffle and the outer rod slide at the bottom of the steam inlet structure and the bottom of the branch pipe (this is a phenomenon that occurs when the vibration intensity is large). The sliding force eliminates the left and right vibration and improves the stability of the steam inlet structure.

[0010] 2. When steam enters and comes into contact with the flow guide assembly, it transmits the impact force to the flow guide assembly. The inner side of the flow guide assembly controls the downward flow and direction of the steam, while simultaneously transmitting the impact force to the moving rod. The moving rod, with the help of spring elasticity, transmits the impact force outward, eliminating the impact force and reducing the impact on the steam inlet structure.

[0011] 3. After the connecting flange is connected to the steam inlet pipeline, the connecting shaft replaces the bolts for positioning and connection. The connecting shaft is fixed by moving the connecting plug and disassembly components downward, which improves the convenience of assembly and disassembly.

[0012] When steam leaks, the steam guide plate blocks the steam and changes its direction, allowing it to be discharged laterally through the arc-shaped channel, preventing injury to workers who get close. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0014] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0015] In the attached diagram:

[0016] Figure 1 This is a three-dimensional structural diagram of the steam inlet structure according to an embodiment of the present invention.

[0017] Figure 2 This is a bottom view schematic diagram of the steam inlet structure according to an embodiment of the present invention.

[0018] Figure 3 This is an exploded three-dimensional structural diagram of the steam inlet structure according to an embodiment of the present invention.

[0019] Figure 4 This is an exploded bottom view of the steam inlet structure according to an embodiment of the present invention.

[0020] Figure 5 This is a partially exploded three-dimensional structural diagram of the steam inlet structure according to an embodiment of the present invention.

[0021] Figure 6 This is an exploded three-dimensional structural diagram of the collar of the steam inlet structure according to an embodiment of the present invention.

[0022] Figure 7This is an exploded perspective view of the connecting flange of the steam inlet structure according to an embodiment of the present invention.

[0023] Figure 8 This is an exploded bottom view of the connecting flange of the steam inlet structure according to an embodiment of the present invention.

[0024] List of reference numerals

[0025] 1. Steam inlet structure; 101. Heat exchange assembly; 102. Bolt connection hole; 103. Positioning baffle; 104. Outer rod; 105. Bottom insertion pipe; 106. Top insertion pipe; 107. Flow guide expansion port; 108. Auxiliary rod;

[0026] 2. Collar; 201. Support plate; 202. Insertion assembly; 203. Telescopic groove; 204. Moving rod; 205. Flow guide assembly;

[0027] 3. Connecting flange; 301. Positioning guide ring; 302. Steam guide plate; 303. Adjusting guide frame; 304. Connecting shaft; 305. Force-bearing slot; 306. Disassembly pull piece; 307. Guide assembly; 308. Connecting plug. Detailed Implementation

[0028] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0029] Example 1: Please refer to Figures 1 to 8 As shown:

[0030] This invention provides a steam turbine inlet structure, including an inlet structure 1; the L-shaped tubular inlet structure 1 has two branch pipes at its bottom to control steam distribution. The key feature is that a top insert 106 for steam transmission is inserted into the bottom end of the inlet structure 1 and into each of the branch pipes. The diameter of the top insert 106 is 5 cm smaller than the diameter of the bottom end of the inlet structure 1 and the diameters of the two branch pipes, providing space for the top insert 106 to move within the bottom end of the inlet structure 1 and into the branch pipes. The top end of the top insert 106 is fixed with... The flow-guiding expansion port 107, made of elastic metal, initially eliminates vibration forces through elasticity. The funnel-shaped flow-guiding expansion port 107 fits snugly against the bottom end of the steam inlet structure 1 and the inner wall of the branch pipe, providing a seal while maintaining contact. The collar 2 is fixedly fitted onto the outside of the steam inlet structure 1. The collar 2 is connected to a freely retractable movable rod 204 via a support plate 201 and an insertion assembly 202. The inner end of the movable rod 204 is fixedly connected to the flow-guiding assembly 205, causing the flow-guiding assembly 205 to move along with it. The flow-guiding assembly 205 then... The impact force is transmitted outward, reducing the impact on the steam inlet structure 1. The connecting flange 3 is welded and fixed at the steam inlet end of the steam inlet structure 1 and connected to the steam inlet pipeline. A ring-shaped steam guide plate 302 is fixed on the outside of the connecting flange 3. The steam guide plate 302 is an arc-shaped plate structure that blocks the steam and prevents the steam from being discharged directly outward. The inside of the steam guide plate 302 is provided with an arc-shaped groove for controlling the steam flow and controlling the smooth discharge of steam. The connecting flange 3 is equipped with a disassembly puller 306 through the adjusting guide frame 303. The disassembly puller 306 is connected to a connecting plug 308 that can slide freely left and right through the guide assembly 307. The outside of the connecting plug 308 is provided with a triangular block for force displacement. After being inserted into the force-bearing slot 305, it fixes the connecting shaft 304, which is convenient for fixing and disassembly. At the same time, as the spring continuously pushes the guide assembly 307, the triangular block slides in contact with the outside of the force-bearing slot 305, generating inward displacement force. The connecting plug 308 continuously pushes the steam inlet pipeline, improving the sealing strength.

[0031] refer to Figure 5A heat exchange component 101 is fixed at the steam inlet end of the steam inlet structure 1. The outer end of the heat exchange component 101 has a conical structure and is connected to a liquid inlet pipe and a liquid outlet pipe on both sides. The liquid inlet pipe and the liquid outlet pipe pass through the steam inlet structure 1 and are located outside the steam inlet structure 1. Water is controlled to enter for heat exchange, and the steam will not lose a large amount of heat. The bottom end of the steam inlet structure 1 and the bottom end of the branch pipe are provided with annularly arranged bolt connection holes 102. The diameter of the bolt connection holes 102 is 1 cm larger than the diameter of the fixing bolts to facilitate the movement of the bolts inside. A positioning baffle for auxiliary sealing is respectively fitted to the bottom end of the steam inlet structure 1 and the bottom end of the branch pipe. 103, and is located at the bottom of the steam inlet structure 1 and the bottom of the branch pipe, which can slide freely. After encountering large vibrations, it will adapt to displacement. The outer ring of the positioning baffle 103 is fixed with an outer rod 104 in a ring to mark the exposed length. The bottom of the positioning baffle 103 is fixed with a bottom insertion pipe 105 inserted into the steam turbine, which directly inputs steam into the steam turbine to reduce the chance of leakage. The bottom of the guide expansion port 107 is fixed with an auxiliary rod 108 in a ring. The bottom of the elastic metal auxiliary rod 108 is spherical and contacts the inner wall of the steam inlet structure 1 and the inner wall of the branch pipe to assist in shock absorption and eliminate the impact force generated by vibration.

[0032] refer to Figure 6 A support plate 201 is fixed above the rear end of the collar 2 for support and to support the insertion component 202. The insertion component 202, which is inserted into the steam inlet structure 1, is fixed inside the support plate 201. The insertion component 202 is welded to the steam inlet structure 1. The insertion component 202 is provided with a telescopic groove 203 for guiding movement. The control rod 204 guides the sliding. The telescopic groove 203 with a U-shaped shaft structure is equipped with a moving rod 204 by a spring. The inner end of the moving rod 204 and the guide component 205 are located in the steam turning position inside the steam inlet structure 1. The bottom of the inner side of the guide component 205 is a downwardly inclined arc structure.

[0033] refer to Figure 7 and Figure 8A circular positioning guide ring 301 is fixed to the outside of the connecting flange 3. The positioning guide ring 301 is inserted into the steam inlet pipe for positioning, controlling the temporary connection between the steam inlet pipe and the connecting flange 3 to prevent misalignment, facilitating the insertion of the connecting shaft 304, and increasing the contact area and sealing area with the steam inlet pipe. A ring of circular holes is fixed to the outside of the connecting flange 3, corresponding to the bolt holes of the steam inlet pipe, controlling the insertion and positioning of the connecting shaft 304. A ring of adjusting guide brackets 303 is fixed to the outside of the connecting flange 3 to control the installation of the circular rod and the disassembly puller 306. A cylindrical connecting shaft 304 is inserted into the circular hole of the connecting flange 3, and the connecting shaft 304 is simultaneously inserted into the threaded hole of the steam inlet pipe for positioning, controlling the positioning connection between the connecting flange 3 and the steam inlet pipe. Each connecting shaft 304 has a rectangular groove at its inner end for fixing, which is inserted into the bottom end of the disassembly puller 306 for fixation. Each connecting shaft 304 has an opening at its outer end. There is a force-receiving slot 305 with an inclined outer side. A connecting plug 308 and a triangular block are inserted into the inside of the force-receiving slot 305. The outer side of the force-receiving slot 305 contacts the inclined side of the triangular block and slides. After displacement, it pushes the steam inlet pipe, generating a pushing force to improve the sealing effect. A disassembly puller 306 that can move freely up and down is installed on the side of the adjusting guide frame 303. The bottom end of the disassembly puller 306 is inserted into the rectangular groove of the connecting shaft 304 to fix the connecting shaft 304. A round rod that can be freely pulled out and inserted into the adjusting guide frame 303 is fixed on the side of the disassembly puller 306. A spring is fitted on the outside of the round rod, which continuously pushes the disassembly puller 306 and the guide assembly 307 downward. The outside of the disassembly puller 306 is fixedly connected to the guide assembly 307. The guide assembly 307 is fitted on the outside of the round rod and slides freely. The top end of the guide assembly 307 contacts the spring and is pushed by the spring to move.

[0034] The specific usage and function of this embodiment: In this invention, after the steam turbine is installed, the bottom insertion pipe 105 is inserted into the steam turbine. Then, the steam inlet structure 1 is installed, and the guide expansion port 107 and the top insertion pipe 106 are inserted into the bottom end of the steam inlet structure 1 and the branch pipe. Then, the steam inlet structure 1 and the branch pipe are fixed with bolts and nuts. The disassembly puller 306 is pulled up, and the steam inlet pipeline is initially connected with the connecting flange 3. The positioning guide ring 301 is inserted into the steam inlet pipeline, and the steam guide plate 302 is positioned outside the steam inlet pipeline. Then, the connecting shaft 304 is simultaneously inserted into the round hole of the connecting flange 3 and the threaded insertion hole of the air inlet pipe. Then, the disassembly puller 306 is no longer pulled, and the spring pushes the disassembly puller 306 and the guide assembly 307 to move downward. The disassembly puller 306 is inserted into the connecting shaft 304. The internal cavity of the shaped groove is initially fixed, and the connecting plug 308 is inserted into the force-bearing slot 305. The triangular block slides in contact with the outside of the force-bearing slot 305, generating a pushing force. The pushing force is amplified by the vibration force, pushing the steam inlet pipe to fit tightly against the connecting flange 3 to prevent loosening and improve the sealing effect. The connecting shaft 304 replaces the bolts to quickly connect the connecting flange 3 and the steam inlet pipe. Conversely, it can also be quickly and conveniently disassembled, improving maintenance efficiency. Then, the steam is continuously input into the steam inlet structure 1. The steam inlet structure 1 controls the steam flow. The steam passes through the flow guide component 205 to eliminate the impact force. The vibration generated by the steam turbine is eliminated through the flow guide expansion port 107, reducing the impact on the steam inlet structure 1. When steam leakage occurs at the connection position between the connecting flange 3 and the steam inlet pipe, the steam guide plate 302 changes the flow direction to prevent personnel from being injured if they approach.

Claims

1. A steam turbine inlet structure, comprising: Steam inlet structure (1); The bottom of the steam inlet structure (1) with an L-shaped tubular structure is provided with two branch pipes. The steam inlet structure (1) is characterized in that a top insert pipe (106) for transmitting steam is inserted into the bottom end of the steam inlet structure (1) and the branch pipe respectively. The diameter of the top insert pipe (106) is 5cm smaller than the bottom diameter of the steam inlet structure (1) and the diameter of the two branch pipes. The top end of the top insert pipe (106) is fixed with a flow expansion port (107) made of elastic metal material. The flow expansion port (107) with a funnel-shaped structure is in contact with the bottom end of the steam inlet structure (1) and the inner wall of the branch pipe. The collar (2) is fixed on the outside of the steam inlet structure (1). The collar (2) is connected to a freely telescopic moving rod (204) through the support plate (201) and the insertion assembly (202). The inner end of the moving rod (204) is fixedly connected to the flow guide assembly (205) and drives the flow guide assembly (205) to move together. A connecting flange (3) is welded and fixed at the steam inlet end of the steam inlet structure (1) and connected to the steam inlet pipeline. A steam guide plate (302) arranged in a ring is fixed on the outside of the connecting flange (3). The steam guide plate (302) is an arc-shaped plate structure. An arc-shaped groove for controlling the steam flow is provided inside the steam guide plate (302). A disassembly puller (306) is installed on the connecting flange (3) through the adjusting guide frame (303). The disassembly puller (306) is connected to a connecting plug (308) that can slide freely left and right through the guide assembly (307). A triangular block for force displacement is provided on the outside of the connecting plug (308).

2. The steam turbine inlet structure as described in claim 1, characterized in that: The steam inlet structure (1) has a heat exchange component (101) fixed at the steam inlet end. The heat exchange component (101) with a conical structure at the outer end is connected to a liquid inlet pipe and a liquid outlet pipe on both sides. The liquid inlet pipe and the liquid outlet pipe pass through the steam inlet structure (1) and are located outside the steam inlet structure (1). The bottom end of the steam inlet structure (1) and the bottom end of the branch pipe are provided with bolt connection holes (102) arranged in a ring. The diameter of the bolt connection hole (102) is 1 cm larger than the diameter of the fixing bolt.

3. The steam turbine inlet structure as described in claim 1, characterized in that: A positioning baffle (103) for auxiliary sealing is attached to the bottom end of the steam inlet structure (1) and the bottom end of the branch pipe, respectively, and can slide freely at the bottom end of the steam inlet structure (1) and the bottom end of the branch pipe. The positioning baffle (103) with a circular structure is fixed with an outer rod (104) arranged in a ring.

4. The steam turbine inlet structure as described in claim 3, characterized in that: The bottom of the positioning baffle (103) is fixed with a bottom insertion tube (105) inserted into the steam turbine, and the bottom of the flow expansion port (107) is fixed with an auxiliary rod (108) arranged in a ring. The bottom end of the auxiliary rod (108) made of elastic metal is a spherical structure.

5. The steam turbine inlet structure as described in claim 1, characterized in that: A support plate (201) is fixed above the rear end of the collar (2) for support, and an insertion component (202) inserted into the steam inlet structure (1) is fixed on the inner side of the support plate (201).

6. The steam turbine inlet structure as described in claim 5, characterized in that: The insertion assembly (202) has a telescopic groove (203) for guiding movement inside. The telescopic groove (203) of the T-shaped shaft structure has a moving rod (204) installed inside by a spring. The inner end of the moving rod (204) and the flow guiding assembly (205) are located in the steam turning position inside the steam inlet structure (1).

7. The steam turbine inlet structure as described in claim 1, characterized in that: The outer side of the connecting flange (3) is fixed with a positioning guide ring (301) of an annular structure. The positioning guide ring (301) is inserted into the steam inlet pipe for positioning. The outer side of the connecting flange (3) is fixed with annularly arranged circular holes, which correspond to the bolt holes of the steam inlet pipe.

8. The steam turbine inlet structure as described in claim 1, characterized in that: The connecting flange (3) is fixed with an annularly arranged adjusting guide frame (303) on the outside. A cylindrical connecting shaft (304) is inserted into the round hole of the connecting flange (3). The connecting shaft (304) is also inserted into the threaded insertion hole of the steam inlet pipe for positioning. Each connecting shaft (304) has a rectangular groove for fixing at its inner end.

9. The steam turbine inlet structure as described in claim 8, characterized in that: Each of the connecting shafts (304) has a force-bearing slot (305) with an inclined outer side at its outer end. A connecting plug (308) and a triangular block are inserted into the force-bearing slot (305). The outer side of the force-bearing slot (305) contacts the inclined side of the triangular block and slides.

10. The steam turbine inlet structure as described in claim 9, characterized in that: The side of the adjusting guide frame (303) is equipped with a disassembly puller (306) that can move freely up and down. The bottom end of the disassembly puller (306) is inserted into the rectangular groove of the connecting shaft (304) and fixes the connecting shaft (304). The side of the disassembly puller (306) is fixed with a round rod that is inserted into the adjusting guide frame (303) and can be pulled freely. A spring is fitted on the outside of the round rod. The outside of the disassembly puller (306) is fixedly connected to the guide assembly (307). The guide assembly (307) is fitted on the outside of the round rod and slides freely. The top end of the guide assembly (307) contacts the spring and is pushed by the spring to move.

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