Shaft seal steam leakage device of ultrahigh pressure cylinder of steam turbine

Abstract

The utility model relates to a shaft seal steam leakage device of a turbine ultrahigh pressure cylinder, and relates to the field of turbine shaft seals. The steam turbine comprises a steam turbine shaft and an oil seal part, a fixed screw hole plate is fixed to the end of the steam turbine shaft, the steam turbine shaft is vertically sleeved with the oil seal part, the oil seal part comprises an inner rotating ring and an outer rotating ring, the steam turbine shaft is sleeved with the inner rotating ring, the end, close to the fixed screw hole plate, of the inner rotating ring is fixedly connected, and the outer rotating ring is rotationally connected to the outer portion of the inner rotating ring; and a plurality of fixing studs are vertically fixed on the outer wall of the outer rotating ring. The inner rotating ring of the oil seal piece is fixed to the steam turbine shaft, then the outer rotating ring is fixed to the inner wall of the steam turbine, the oil seal piece is composed of the inner rotating ring and the outer rotating ring which rotate along with the steam turbine shaft, a tight contact face is formed between the inner rotating ring and the outer rotating ring, and when steam pressure in a steam turbine shell is large, steam is blocked by the inner rotating ring and the outer rotating ring; and the pressure is increased to abut into the pressure relief ring box, so that the steam is subjected to pressure relief treatment, and the steam pressure inside the steam turbine is prevented from being increased.

Description

Technical Field

[0001] The present application relates to the technical field of steam turbine shaft seals, and in particular to a steam turbine shaft seal steam leakage device for an ultra-high pressure cylinder. Background Art

[0002] The fitting parts between the turbine rotor shaft and the front and rear ends of the cylinder are dynamic and static, and the existence of gaps will cause steam leakage. Therefore, shaft seals are designed at the front and rear ends of the cylinder to reduce steam leakage, reduce heat consumption, and improve turbine efficiency. In order to solve the problem of shaft seal steam leakage of the steam turbine, steam seal blocks are generally installed at the shaft seal positions at the front and rear ends of the cylinder. The purpose of reducing shaft seal steam leakage is achieved by adjusting the gap between the gas seal teeth on the steam seal block and the rotor shaft. At the same time, the shaft seal housing is designed with steam inlet and exhaust pipes to maintain a certain pressure at the shaft seal to form a sealed state, to ensure that the shaft seal reduces steam leakage as much as possible.

[0003] The existing announcement number is CN217841749U, and the name is a steam turbine shaft seal leakage isolation device, which includes a support frame, a compressed air distribution pipe and an injection assembly. The support frame includes a base, two rods arranged on the base and a support seat connected and fixed with the two rods. The compressed air distribution pipe includes a main pipe and two branch pipes connected to the main pipe. The main pipe is fixed to the support seat. The injection assembly is arranged below the compressed air distribution pipe, including two semi-circular injection pipes, a plurality of nozzles arranged on the inner surface of each injection pipe, and an air inlet joint and a connection provided on the outer surface of each injection pipe. The connecting rod and the two ends of the jet pipe are closed and are equipped with magnetic blocks. A retractable hose is sealed between the air inlet joint and the branch pipe. The connecting rod is rotatably connected to the rod body. The turbine shaft seal steam leakage isolation device forms a compressed air curtain between the bearing box and the turbine cylinder to isolate the leaking steam from entering the bearing box from the leakage of the shaft seal teeth, effectively preventing steam from entering the bearing box and causing the deterioration of the lubricating oil. It solves the problem of inconvenience in replacing the steam seal block due to shaft seal steam leakage during turbine operation and the problem of shaft seal steam leakage entering the lubricating oil through the bearing box oil baffle causing oil deterioration, which seriously affects the safe operation of the turbine.

[0004] With regard to the above-mentioned related technologies, the inventors found that in order to avoid leakage of high-pressure steam through the shaft seal, a compressed air curtain is formed between the bearing box and the turbine cylinder at the shaft seal, and the air curtain is used to prevent leakage of high-pressure steam. However, the continuous addition of high-pressure gas causes the pressure in the cylinder to increase, which increases the steam pressure value. After the steam pressure is greater than the air curtain pressure in the later stage, it is still easy to cause steam leakage. Utility Model Content

[0005] In order to overcome the existing method of preventing high-pressure steam from leaking through the shaft seal, a compressed air curtain is formed between the bearing box and the turbine cylinder at the shaft seal. The air curtain is used to prevent high-pressure steam leakage. However, continuous addition of high-pressure gas causes the pressure in the cylinder to increase, which increases the steam pressure value. After the steam pressure is greater than the air curtain pressure in the later stage, it is still easy to cause steam leakage. The present application provides a shaft seal leakage device for an ultra-high-pressure cylinder of a turbine.

[0006] The present application provides a steam turbine ultra-high pressure cylinder shaft seal steam leakage device adopts the following technical solution:

[0007] A steam seal leakage device for an ultra-high pressure cylinder of a steam turbine comprises a steam turbine shaft and an oil seal, wherein a fixing screw hole plate is fixed to the end of the steam turbine shaft, and an oil seal is vertically sleeved on the steam turbine shaft, the oil seal comprises an inner rotating ring and an outer rotating ring, the inner rotating ring is sleeved on the outside of the steam turbine shaft, and the inner rotating ring is fixedly connected to one end of the inner rotating ring close to the fixing screw hole plate, the outer rotation of the inner rotating ring is connected to the outer rotating ring, and a plurality of fixing studs are vertically fixed on the outer wall of the outer rotating ring, and a pressure relief part is fixed to the end of the inner rotating ring away from the fixing screw hole plate, the pressure relief part comprises a pressure relief ring box, and the pressure relief ring box is fixed to one end face of the inner rotating ring away from the fixing screw hole plate.

[0008] By adopting the above technical solution, during use, the inner rotating ring of the oil seal is inserted into the turbine shaft, and then fixedly connected to the side of the inner rotating ring close to the fixing screw hole plate. The outer rotating ring is then rotated and connected to the outer wall of the inner rotating ring. During use, the inner rotating ring of the oil seal is fixed to the turbine shaft, and the outer rotating ring is fixed to the inner wall of the turbine. The inner rotating ring rotates with the turbine shaft and forms a close contact surface between the inner rotating ring and the outer rotating ring. When the steam pressure in the turbine casing is high, the steam is blocked by the inner and outer rotating rings, and the increased pressure is pushed into the pressure relief ring box, thereby relieving the steam pressure and preventing the increase of steam pressure inside the turbine.

[0009] Optionally, an air inlet cylinder is evenly fixed through the outer end surface of the pressure relief ring box, and a sealing plug is inserted into the air inlet cylinder.

[0010] By adopting the above technical solution, when the steam pressure in the turbine casing is high during use, the steam pushes the seal in the air inlet cylinder to move horizontally. When the seal slides out of the air inlet cylinder, the steam enters the pressure relief ring box through the air inlet cylinder.

[0011] Optionally, a spring is fixed to one end of the plug, and the other end of the spring is fixed to one end of the inner wall of the pressure relief ring box.

[0012] By adopting the above technical solution, when the steam pressure in the turbine casing is high, the steam pushes the seal in the air inlet tube to move horizontally, and the extrusion spring deforms and contracts. When the seal slides out of the air inlet tube, the steam enters the pressure relief ring box through the air inlet tube.

[0013] Optionally, an air relief pipe is connected and fixed on the outer wall of the pressure relief ring box, and a cooling water cylinder is provided at the bottom end of the air relief pipe.

[0014] By adopting the above technical solution, the steam in the pressure relief ring box is led out into the cooling water cylinder through the air relief pipe, and the steam contacts the water in the cooling water cylinder to cool the steam for recovery and treatment.

[0015] Optionally, a plurality of air holes are provided through the top of the cooling water cylinder, and a drain pipe is connected and fixed on the bottom surface of the cooling water cylinder, and a valve is assembled on the drain pipe.

[0016] By adopting the above technical solution, the steam introduced during use is discharged from the air vents, and the drain pipe vertically connected to the bottom of the cooling water cylinder facilitates the discharge of the cooled water.

[0017] Optionally, a rotation groove is opened on the outer circumference of the inner rotating ring, and a plurality of rollers are evenly connected to the inner wall of the rotation groove of the inner rotating ring. An insert ring is fixed on the inner circumference of the outer rotating ring, and the insert ring of the outer rotating ring is rotatably inserted into the rotation groove of the inner rotating ring.

[0018] By adopting the above technical solution, the insert rings of the inner and outer rotating rings are rotated and inserted into the rotating groove of the inner rotating ring. Under the rotation of multiple rollers, rotation and deflection are facilitated. At the same time, an inner rotating ring rotates with the turbine shaft and is composed of an outer rotating ring, and a close contact surface is formed between the two. When the steam pressure in the turbine casing is high, the steam is blocked by the inner and outer rotating rings.

[0019] Optionally, mounting grooves are provided on adjacent end surfaces of the fixing screw hole plate and the inner swivel, and the mounting grooves of the fixing screw hole plate and the inner swivel are filled with rubber rings.

[0020] By adopting the above technical solution, the fixing screw hole plate and the inner swivel installation groove are filled with rubber rings, and the rubber rings are used to seal the gaps in the screw hole plate and the inner swivel installation groove to ensure the sealing of the assembly of the fixing screw hole plate and the inner swivel.

[0021] Optionally, the fixing screw hole plate and the inner swivel are connected by threaded assembly of locking bolts.

[0022] By adopting the above technical solution, the fixed screw hole plate and the inner swivel are assembled and connected through the locking bolt threads, thereby ensuring the fixed assembly of the oil seal and the turbine shaft.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: during use, the inner rotating ring of the oil seal is inserted into the turbine shaft, and then the inner rotating ring is fixedly connected to the side of the fixing screw plate. Then, the outer rotating ring is rotated and connected on the outer wall of the inner rotating ring. During use, the inner rotating ring of the oil seal is fixed to the turbine shaft, and then the outer rotating ring is fixed to the inner wall of the turbine. The oil seal is composed of an inner rotating ring that rotates with the turbine shaft and an outer rotating ring, and a close contact surface is formed between the two. When the steam pressure in the turbine casing is high, the steam is blocked by the inner and outer rotating rings, and the increased pressure is pressed into the pressure relief ring box, thereby relieving the steam and preventing the steam pressure inside the turbine from increasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0025] Figure 2 This is a schematic diagram of the structure of the embodiment of the present application in an exploded state;

[0026] Figure 3 This is a schematic structural diagram of the turbine shaft in an exploded state according to an embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of the oil seal in the embodiment of the present application in a disassembled state;

[0028] Figure 5 It is a schematic structural diagram of the pressure relief component in the disassembled state according to an embodiment of the present application.

[0029] Explanation of the accompanying symbols: 1. Turbine shaft; 11. Fixing screw plate; 12. Rubber ring; 13. Locking bolt; 2. Oil seal; 21. Inner swivel; 211. Roller; 22. Outer swivel; 221. Fixing stud; 23. Pressure relief part; 231. Pressure relief ring box; 232. Air intake pipe; 233. Plug; 234. Spring; 235. Air vent pipe; 236. Cooling water cylinder; 237. Drain pipe. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to the accompanying drawings.

[0031] The embodiment of the present application discloses a steam leakage device for a shaft seal of an ultra-high pressure cylinder of a steam turbine. Figure 1 、 Figure 2 、 Figure 3 and Figure 4A steam seal leakage device for an ultra-high pressure cylinder of a steam turbine comprises a steam turbine shaft 1 and an oil seal 2. A fixing screw plate 11 is fixed to the end of the steam turbine shaft 1, and an oil seal 2 is vertically sleeved on the steam turbine shaft 1. The oil seal 2 comprises an inner rotating ring 21 and an outer rotating ring 22. The inner rotating ring 21 is sleeved on the outside of the steam turbine shaft 1, and the end of the inner rotating ring 21 close to the fixing screw plate 11 is fixedly connected, the outer rotatable connection of the inner rotating ring 21 is connected to the outer rotating ring 22, and a plurality of fixing studs 221 are vertically fixed on the outer wall of the outer rotating ring 22, a pressure relief piece 23 is fixed to the end of the inner rotating ring 21 away from the fixing screw plate 11, and the pressure relief piece 23 comprises a pressure relief ring box 231, which is fixed to an end face of the inner rotating ring 21 away from the fixing screw plate 11.

[0032] By adopting the above technical solution, during use, the inner rotating ring 21 of the oil seal 2 is inserted into the turbine shaft 1, and then the inner rotating ring 21 is fixedly connected to the side of the fixing screw plate 11. Then, the outer rotating ring 22 is rotated and connected to the outer wall of the inner rotating ring 21. During use, the inner rotating ring 21 of the oil seal 2 is fixed to the turbine shaft 1, and the outer rotating ring 22 is fixed to the inner wall of the turbine. The inner rotating ring 21 rotates with the turbine shaft 1 and the outer rotating ring 22 form a close contact surface between the inner rotating ring 21 and the outer rotating ring 22. When the steam pressure in the turbine casing is high, the steam is blocked by the inner rotating ring 21 and the outer rotating ring 22, and the increased pressure is pushed into the pressure relief ring box 231, thereby relieving the steam pressure and preventing the increase of steam pressure inside the turbine.

[0033] Reference Figure 5 An air inlet cylinder 232 is evenly fixed on the outer end surface of the pressure relief ring box 231, and a sealing plug 233 is inserted into the air inlet cylinder 232. When the steam pressure in the turbine casing is high during use, the steam pushes the sealing plug 233 in the air inlet cylinder 232 to move horizontally. When the sealing plug 233 slides out of the air inlet cylinder 232, the steam enters the pressure relief ring box 231 through the air inlet cylinder 232. A spring 234 is fixed to one end of the sealing plug 233, and the other end of the spring 234 is fixed to one end of the inner wall of the pressure relief ring box 231. When the steam pressure in the turbine casing is high, the steam pushes the sealing plug 233 in the air inlet cylinder 232 to move horizontally, squeezing the spring 234 to deform and contract. When the sealing plug 233 slides out of the air inlet cylinder 232, the steam enters the pressure relief ring box 231 through the air inlet cylinder 232. An air release pipe 235 is fixed to the outer wall of the pressure relief ring box 231, and the bottom end of the air release pipe 235 is connected to a cooling water cylinder 236. The steam in the pressure relief ring box 231 is led out through the air release pipe 235 into the cooling water cylinder 236, where the steam contacts water and is cooled for recovery.

[0034] Reference Figure 5The top of the cooling water cylinder 236 is provided with a plurality of ventilation holes, and a drain pipe 237 is fixedly connected to the bottom of the cooling water cylinder 236, and a valve is assembled on the drain pipe 237. During use, the steam introduced is discharged from the ventilation holes. The drain pipe 237 is vertically connected to the bottom of the cooling water cylinder 236 to facilitate the discharge of the cooled water.

[0035] Reference Figure 3 and Figure 4 The inner swivel ring 21 has a groove on its outer circumference, and multiple rollers 211 are evenly connected to the inner wall of the groove. An insert ring is fixed to the inner circumference of the outer swivel ring 22, and the insert ring of the outer swivel ring 22 is rotatably inserted into the groove of the inner swivel ring 21. During use, the insert ring of the outer swivel ring 22 is rotatably inserted into the groove of the inner swivel ring 21. Under the rotation of the multiple rollers 211, the rotation and deflection are facilitated. At the same time, the inner swivel ring 21 rotates with the turbine shaft 1 and forms a close contact surface with the outer swivel ring 22. When the steam pressure in the turbine casing is high, the steam is blocked by the inner swivel ring 21 and the outer swivel ring 22.

[0036] Reference Figure 3 and Figure 4 , mounting grooves are provided on the adjacent end faces of the fixing screw hole plate 11 and the inner swivel 21, and the mounting grooves of the fixing screw hole plate 11 and the inner swivel 21 are filled with rubber rings 12. The mounting grooves of the fixing screw hole plate 11 and the inner swivel 21 are filled with rubber rings 12, and the rubber rings 12 are used to block the gaps in the mounting grooves of the screw hole plate 11 and the inner swivel 21, ensuring the sealing of the assembly of the fixing screw hole plate 11 and the inner swivel 21. The fixing screw hole plate 11 and the inner swivel 21 are threadedly assembled and connected by locking bolts 13. The fixing screw hole plate 11 and the inner swivel 21 are threadedly assembled and connected by locking bolts 13, ensuring that the oil seal 2 is fixedly assembled to the turbine shaft 1.

[0037] The implementation principle of the shaft seal steam leakage device for the ultra-high pressure cylinder of a steam turbine according to an embodiment of the present application is as follows: during use, the inner rotating ring 21 of the oil seal 2 is inserted into the steam turbine shaft 1, and then the inner rotating ring 21 is fixedly connected to the side of the fixing screw hole plate 11. Then, the outer rotating ring 22 is rotated and connected to the outer wall of the inner rotating ring 21. During use, the inner rotating ring 21 of the oil seal 2 is fixed to the steam turbine shaft 1, and then the outer rotating ring 22 is fixed to the inner wall of the steam turbine. The device is composed of an inner rotating ring 21 that rotates with the steam turbine shaft 1 and an outer rotating ring 22, and a close contact surface is formed between the two. When the steam pressure in the steam turbine casing is relatively high, the steam is blocked by the inner rotating ring 21 and the outer rotating ring 22, and the increased pressure is pressed into the pressure relief ring box 231.

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A steam turbine ultra-high pressure cylinder shaft seal steam leakage device, characterized in that: The invention comprises a turbine shaft (1) and an oil seal (2), wherein a fixing screw hole plate (11) is fixed to the end of the turbine shaft (1), and the oil seal (2) is vertically sleeved on the turbine shaft (1), and the oil seal (2) comprises an inner rotating ring (21) and an outer rotating ring (22), wherein the inner rotating ring (21) is sleeved on the outside of the turbine shaft (1), and the inner rotating ring (21) is fixedly connected to one end of the inner rotating ring (21) close to the fixing screw hole plate (11), the outer part of the inner rotating ring (21) is rotatably connected to the outer rotating ring (22), and a plurality of fixing studs (221) are vertically fixed on the outer wall of the outer rotating ring (22), and a pressure relief member (23) is fixed to one end of the inner rotating ring (21) away from the fixing screw hole plate (11), and the pressure relief member (23) comprises a pressure relief ring box (231), and the pressure relief ring box (231) is fixed to one end surface of the inner rotating ring (21) away from the fixing screw hole plate (11).

2. The steam turbine ultra-high pressure cylinder shaft seal steam leakage device according to claim 1, characterized in that: An air inlet cylinder (232) is evenly and fixedly passed through the outer end surface of the pressure relief ring box (231), and a sealing plug (233) is inserted into the air inlet cylinder (232).

3. The steam turbine ultra-high pressure cylinder shaft seal steam leakage device according to claim 2, characterized in that: A spring (234) is fixed to one end of the sealing plug (233), and the other end of the spring (234) is fixed to one end of the inner wall of the pressure relief ring box (231).

4. The steam turbine ultra-high pressure cylinder shaft seal steam leakage device according to claim 3, characterized in that: An air relief pipe (235) is connected and fixed on the outer wall of the pressure relief ring box (231), and a cooling water cylinder (236) is provided at the bottom end of the air relief pipe (235).

5. The steam turbine ultra-high pressure cylinder shaft seal steam leakage device according to claim 4, characterized in that: The top of the cooling water cylinder (236) is provided with a plurality of air holes, and a drainage pipe (237) is connected and fixed on the bottom surface of the cooling water cylinder (236), and a valve is assembled on the drainage pipe (237).

6. The steam turbine ultra-high pressure cylinder shaft seal steam leakage device according to claim 5, characterized in that: A rotation groove is provided on the outer circumferential surface of the inner rotating ring (21), and a plurality of rollers (211) are evenly connected to the inner wall of the rotation groove of the inner rotating ring (21). An insert ring is fixed on the inner circumferential surface of the outer rotating ring (22), and the insert ring of the outer rotating ring (22) is rotatably inserted into the rotation groove of the inner rotating ring (21).

7. The steam turbine ultra-high pressure cylinder shaft seal steam leakage device according to claim 6, characterized in that: Adjacent end surfaces of the fixing screw hole plate (11) and the inner rotating ring (21) are both provided with mounting grooves, and the mounting grooves of the fixing screw hole plate (11) and the inner rotating ring (21) are filled with rubber rings (12).

8. The steam turbine ultra-high pressure cylinder shaft seal steam leakage device according to claim 7, characterized in that: The fixing screw hole plate (11) and the inner rotating ring (21) are threadedly assembled and connected via locking bolts (13).

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