CN218062406U

CN218062406U - Steam turbine shaft seal mechanism

Info

Publication number: CN218062406U
Application number: CN202221762997.0U
Authority: CN
Inventors: 侯靖波; 宋贵良; 宋苇
Original assignee: Shanghai Chenghang Turbine Technology Co ltd
Current assignee: Shanghai Chenghang Turbine Technology Co ltd
Priority date: 2022-07-09
Filing date: 2022-07-09
Publication date: 2022-12-16
Anticipated expiration: 2032-07-09

Abstract

The utility model discloses a steam turbine bearing seal mechanism, including the steam turbine cylinder body, be equipped with rotor shaft and sealed tooth in the steam turbine cylinder body, the rotor shaft outside is located to sealed tooth, the cover is equipped with the axle bush on the rotor shaft, and the steam turbine cylinder body outside is located to the axle bush, sealed tooth one side is equipped with O type circle, first sealing washer in proper order, the steam turbine cylinder body is all located to O type circle, first sealing washer to the two cover is established respectively on the rotor shaft, the steam turbine cylinder body outside is fixed with the sealing ring, and the sealing ring cover is established on the rotor shaft, sealing ring one side is equipped with the gasket, be equipped with the ring channel on the steam turbine cylinder body, gasket one end and rotor shaft are fixed, the other end and ring channel swing joint, and the gasket can take place relative rotation with the ring channel, gasket one side is located to the axle bush. The utility model provides a pair of steam turbine bearing seal mechanism provides a new market pattern, can prevent steam leakage, safe and reliable.

Description

Steam turbine shaft seal mechanism

Technical Field

The utility model relates to a steam turbine especially relates to a steam turbine bearing seal mechanism.

Background

The steam turbine impacts the moving blades on the impeller through the high-temperature high-pressure steam nozzle, and the impact force on the moving blades is generated due to the change of the direction of the air flow, so that the impeller is pushed to rotate to do work, and the conversion of heat energy into kinetic energy is realized. The problems that the steam turbine often generates in operation are that the shaft seal steam is leaked outwards due to the abrasion of the shaft seal sealing teeth, and the oil quality is deteriorated after the leaked steam enters the bearing bush, so that the normal production is influenced; when the problems are met, the common adjustment solution is to reduce the supply pressure of the shaft seal steam or to stop the machine to replace the seal teeth. The defects of the solution are as follows: the vacuum of the unit is reduced after the steam pressure of the shaft seal is reduced, and the efficiency is reduced; the machine is shut down to replace the sealing teeth, so that the yield of the machine set is reduced, the operation period is prolonged, and the maintenance cost is increased.

At present, a conventional steam turbine shaft seal mechanism is shown in fig. 1, and includes that a compressed air distribution pipe is additionally arranged between the outer side of a steam turbine shaft seal tooth and a bearing bush 4, a plurality of blowing holes are uniformly arranged on the compressed air distribution pipe, compressed air is uniformly blown from the blowing holes, a compressed air curtain is formed between the shaft seal air leakage and the bearing bush 4, the leaked steam is isolated from entering the bearing bush 4 from the shaft seal tooth 3, and meanwhile, the cooling effect on the bearing bush 4 can also be achieved.

The shaft seal mechanism of the steam turbine can solve the defects and has no problems basically, but can be further improved to enrich the market style and further prevent steam leakage.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned not enough that exists at present, the utility model provides a steam turbine bearing seal mechanism provides a new market pattern, can prevent steam leakage, improves the work efficiency of steam turbine, reduces the maintenance cost of steam turbine, safe and reliable.

In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:

the utility model provides a steam turbine bearing seal mechanism, includes the steam turbine cylinder body, be equipped with rotor shaft and sealed tooth in the steam turbine cylinder body, the rotor shaft outside is located to sealed tooth, the cover is equipped with the axle bush on the rotor shaft, and the steam turbine cylinder body outside is located to the axle bush, sealed tooth one side is equipped with O type circle, first sealing washer in proper order, O type circle, first sealing washer are all located in the steam turbine cylinder body to the two overlaps respectively and establish on the rotor shaft, the steam turbine cylinder body outside is fixed with the sealing ring, and the sealing ring cover is established on the rotor shaft, sealing ring one side is equipped with the gasket, be equipped with the ring channel on the steam turbine cylinder body, gasket one end and rotor shaft are fixed, the other end and ring channel swing joint, and the gasket can take place relative rotation with the ring channel, gasket one side is located to the axle bush.

According to an aspect of the utility model, be equipped with the second sealing washer in the ring channel, the second sealing washer outside is located to the gasket.

According to an aspect of the utility model, the gasket is including sealed disk and sealing ring piece, sealed disk is fixed on the rotor shaft, sealing ring piece one end is fixed with sealed disk, other end swing joint is in the ring channel.

According to the utility model discloses an aspect, sealed disk, seal ring piece, rotor shaft three set up with one heart.

According to an aspect of the present invention, the sealing ring is sleeved outside the second sealing ring.

According to an aspect of the present invention, a sealing cushion pad is disposed in the annular groove, and the sealing ring is disposed on one side of the sealing cushion pad.

According to the utility model discloses an aspect, the steam turbine cylinder body outside is equipped with the end cover, the two threaded connection, the end cover is established on the rotor shaft, the gasket is established in the end cover, rotor shaft, gasket three form the cavity, be equipped with the air vent on the end cover, air vent and cavity intercommunication.

According to the utility model discloses an aspect, air vent one side even has the gas transmission device, and the two passes through the tube coupling, be equipped with the control valve on the pipeline.

According to an aspect of the present invention, the bearing bush is disposed on one side of the end cap.

The utility model discloses the advantage of implementing: the O-shaped ring and the first sealing ring are arranged in the steam turbine cylinder body, so that the sealing property in the steam turbine cylinder body can be further enhanced, and internal steam leakage is prevented; the sealing ring is arranged on the outer side of the steam turbine cylinder body, so that the sealing performance can be continuously enhanced, the steam in the steam turbine cylinder body is prevented from leaking, and the quantity of the steam which can escape from the sealing ring is very small; one end of the sealing sheet is concentrically fixed with the rotor shaft, and the other end of the sealing sheet is movably connected with the annular groove, so that steam leakage can be effectively prevented finally; the second sealing ring is arranged in the annular groove and is arranged on the inner side of the sealing ring piece, so that the sealing performance between the sealing ring piece and the annular groove can be enhanced, and the sealing performance can be further improved by adding the sealing cushion pad; through further setting up gas transmission device, to exporting inert gas in the cavity, form the malleation in the cavity, can prevent steam leakage in the steam turbine cylinder body, the leakproofness is stronger. The device provides a new market style, can prevent steam leakage, improves the work efficiency of steam turbine, reduces the maintenance cost of steam turbine, safe and reliable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a conventional steam turbine shaft seal mechanism;

fig. 2 is a schematic structural diagram of a steam turbine shaft seal mechanism according to the present invention.

The names corresponding to the sequence numbers in the figure are as follows:

1. a steam turbine cylinder; 11. an annular groove; 111. a second seal ring; 112. sealing the cushion pad; 2. a rotor shaft; 3. a seal tooth; 4. bearing bushes; 5. an O-shaped ring; 6. a first seal ring; 7. a seal ring; 8. sealing the sheet; 81. sealing the wafer; 82. a sealing ring sheet; 9. an end cap; 91. a chamber; 92. a vent hole; 10. a gas delivery device; 101. a pipeline; 102. and (4) controlling the valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 2, a steam turbine shaft seal mechanism includes a steam turbine cylinder body 1, a rotor shaft 2 and seal teeth 3 are arranged in the steam turbine cylinder body 1, the seal teeth 3 are arranged on the outer side of the rotor shaft 2, a bearing bush 4 is sleeved on the rotor shaft 2, the bearing bush 4 is arranged on the outer side of the steam turbine cylinder body 1, an O-ring 5 and a first seal ring 6 are sequentially arranged on one side of the seal teeth 3, the O-ring 5 and the first seal ring 6 are arranged in the steam turbine cylinder body 1, and the two are respectively sleeved on the rotor shaft 2, a seal ring 7 is fixed on the outer side of the steam turbine cylinder body 1 through a fastener, the seal ring 7 is sleeved on the rotor shaft 2, a seal sheet 8 is arranged on one side of the seal ring 7, an annular groove 11 is arranged on the steam turbine cylinder body 1, one end of the seal sheet 8 is fixed to the rotor shaft 2, the other end of the seal sheet is movably connected to the annular groove 11, the seal sheet 8 can rotate relative to the annular groove 11, and the bearing bush 4 is arranged on one side of the seal sheet 8.

In practical applications, the number of the O-rings 5 is several, and the O-rings are linearly arrayed along the axial direction of the rotor shaft 2. Sealing ring 7 is the becket, is discoid, and 7 middle parts trompils of sealing ring are used for rotor shaft 2 to pass through, and sealing ring 7 is used for strengthening the leakproofness on the edge of steam turbine cylinder body 1 outside.

In practical application, the sealing sheet 8 comprises a sealing wafer 81 and a sealing ring 7 which are integrally formed or fixed by welding, the sealing wafer 81 is welded and fixed on the rotor shaft 2, the sealing wafer 81 can rotate along with the rotor shaft 2, one end of the sealing ring 7 is fixed with the sealing wafer 81, the other end of the sealing ring is movably connected in the annular groove 11, and the sealing ring 7 can rotate in the annular groove 11. The sealing disk 81 is disc-shaped, and the sealing ring 7 is ring-shaped, both of which can be made of metal material or rubber material. The sealing disc 8 is used as a last line of defense, eventually preventing steam leakage.

In practical application, the sealing disc 81, the sealing ring 7 and the rotor shaft 2 are concentrically arranged.

In practical application, a second sealing ring 111 can be arranged in the annular groove 11 in a glued joint mode, the sealing ring 7 is sleeved on the outer side of the second sealing ring 111, and the sealing ring 7 can rotate relative to the second sealing ring 111. The second sealing ring 111 is used for enhancing the sealing performance of the joint of the sealing sheet 8 and the annular groove 11 and preventing steam from escaping. The width of the annular groove 11 is larger than or equal to the thickness of the sealing ring 7, so that the installation and rotation of the sealing ring 7 are convenient.

In practical application, a sealing cushion 112 may be glued in the annular groove 11, the sealing ring 7 is disposed on one side of the sealing cushion 112, and the sealing cushion 112 contacts or is glued to the second sealing ring 111. The sealing cushion pad 112 can be used for buffering the rigid contact between the sealing ring 7 and the annular groove 11 or the steam turbine cylinder body 1 and can be used for buffering the vibration; and can be used to further cooperate with the second sealing ring 111 to enhance the sealing performance of the sealing sheet 8 at the junction with the annular groove 11.

In practical applications, the first sealing ring 6, the second sealing ring 111, and the sealing cushion 112 can be made of rubber materials, and can be selected according to practical situations.

In practical application, an end cover 9 is additionally arranged on the outer side of the steam turbine cylinder body 1 and is in threaded connection with the steam turbine cylinder body, the bearing bush 4 is arranged on one side of the end cover 9, the end cover 9 is sleeved on the rotor shaft 2, the sealing sheet 8 is arranged in the end cover 9, the rotor shaft 2 and the sealing sheet 8 form a cavity 91, a vent hole 92 is formed in the end cover 9, and the vent hole 92 is communicated with the cavity 91.

In practical application, the air delivery device 10 is connected to one side of the vent hole 92, and the two are connected through a pipeline 101, and a control valve 102 is arranged on the pipeline 101 and used for controlling the on-off of air flow. The gas transmission device 10 can output nitrogen or compressed air from the vent hole 92 to the chamber 91 through the pipeline 101, so that positive pressure is formed in the chamber 91, steam leakage in the steam turbine cylinder 1 can be further prevented, and the possibility that steam still escapes from the sealing plate 8 can be finally reduced or reduced, and the sealing performance is stronger.

In practical application, the seal teeth 3 serve as a first defense for preventing steam leakage; a plurality of O-shaped rings 5 and first sealing rings 6 are used as a second defense for further preventing steam leakage; the sealing ring 7 is used as a third defense for continuously enhancing the sealing performance of the whole device, and the possibility or the escape amount of steam in the steam turbine cylinder body 1 from the sealing ring 7 is very small; the sealing sheet 8 serves as a final defense for finally preventing steam leakage; the gas delivery device 10 and the chamber 91 serve as a final aid, drastically reducing the possibility that steam still escapes from the sealing disc 8. So set up, the leakproofness of whole device is stronger.

In practical application, the O-ring 5, the first sealing ring 6, the gas transmission device 10, the pipeline 101 and the control valve 102 can be selected according to practical situations, and conventional devices on the market can be selected, which is a conventional technology, and the structure and the principle of the conventional technology are not described in detail; the steam turbine cylinder body 1, the rotor shaft 2, the sealing teeth 3 and the bearing bush 4 are all in the prior art and are not described in detail.

The utility model discloses the advantage of implementing: the O-shaped ring 5 and the first sealing ring 6 are arranged in the steam turbine cylinder body 1, so that the sealing property in the steam turbine cylinder body 1 can be further enhanced, and the internal steam is prevented from leaking; the sealing ring 7 is arranged on the outer side of the steam turbine cylinder body 1, so that the sealing performance can be continuously enhanced, the steam in the steam turbine cylinder body 1 is prevented from leaking, and the amount of steam which can escape from the sealing ring 7 is small; one end of the sealing sheet 8 is concentrically fixed with the rotor shaft 2, and the other end of the sealing sheet is movably connected with the annular groove 11, so that steam leakage can be effectively prevented finally; the sealing performance between the sealing ring 7 and the annular groove 11 can be enhanced by arranging the second sealing ring 111 inside the annular groove 11 and arranging the second sealing ring inside the sealing ring 7, and the sealing performance can be further enhanced by adding the sealing cushion pad 112; through further setting up gas transmission device 10, export inert gas such as nitrogen gas in the cavity 91, form the malleation in the cavity 91, can prevent steam leakage in the steam turbine cylinder body 1, the leakproofness is stronger.

In conclusion, the device provides a new market style, can prevent steam leakage, improve the working efficiency of the steam turbine, reduce the maintenance cost of the steam turbine, and is safe and reliable.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a steam turbine bearing seal mechanism, includes steam turbine cylinder body (1), be equipped with rotor shaft (2) and sealed tooth (3) in steam turbine cylinder body (1), rotor shaft (2) outside is located in sealed tooth (3), the cover is equipped with axle bush (4) on rotor shaft (2), and the steam turbine cylinder body (1) outside is located in axle bush (4), its characterized in that, sealed tooth (3) one side is equipped with O type circle (5), first sealing washer (6) in proper order, O type circle (5), first sealing washer (6) are all located in steam turbine cylinder body (1) to the two overlaps respectively and establishes on rotor shaft (2), the steam turbine cylinder body (1) outside is fixed with sealing ring (7), and sealing ring (7) cover is established on rotor shaft (2), sealing ring (7) one side is equipped with gasket (8), be equipped with gasket (11) on steam turbine cylinder body (1), gasket (8) one end and rotor shaft (2) are fixed, the other end and ring channel (11) swing joint, gasket (8) can take place relative rotation with ring (11), bearing bush (4) one side is located.

2. The steam turbine shaft seal arrangement according to claim 1, characterized in that a second sealing ring (111) is provided in the annular groove (11), and the sealing plate (8) is provided outside the second sealing ring (111).

3. The steam turbine shaft seal mechanism according to claim 1, characterized in that the sealing sheet (8) comprises a sealing disc (81) and a sealing ring (7), the sealing disc (81) is fixed on the rotor shaft (2), one end of the sealing ring (7) is fixed with the sealing disc (81), and the other end is movably connected in the annular groove (11).

4. The steam turbine shaft seal arrangement according to claim 3, characterized in that the sealing disc (81), the sealing ring (7) and the rotor shaft (2) are concentrically arranged.

5. The steam turbine gland seal mechanism according to claim 2 or 3, characterized in that the sealing ring (7) is sleeved outside the second sealing ring (111).

6. A steam turbine shaft seal arrangement according to claim 2 or 3, characterized in that a sealing cushion (112) is provided in the annular groove (11), and the sealing ring (7) is provided on one side of the sealing cushion (112).

7. The steam turbine shaft seal mechanism according to claim 1, wherein an end cover (9) is arranged on the outer side of the steam turbine cylinder body (1) and is in threaded connection with the steam turbine cylinder body, the end cover (9) is sleeved on the rotor shaft (2), the sealing sheet (8) is arranged in the end cover (9), the rotor shaft (2) and the sealing sheet (8) form a chamber (91), a vent hole (92) is arranged on the end cover (9), and the vent hole (92) is communicated with the chamber (91).

8. The steam turbine shaft seal mechanism according to claim 7, wherein one side of the vent hole (92) is connected with a gas transmission device (10) which is connected with the vent hole through a pipeline (101), and the pipeline (101) is provided with a control valve (102).

9. The steam turbine gland seal mechanism according to claim 7, wherein the bearing shell (4) is provided on one side of the end cap (9).