Seal protection device for turbine shaft oil retaining ring assembly

Abstract

The utility model discloses a kind of sealing protection devices for steam turbine rotating shaft oil retaining ring assembly, it is related to steam turbine technical field, comprising: protective cabinet, set to the outside of steam turbine oil retaining ring assembly, and fixed by several bolts;Box door, symmetrically set at the both ends of protective cabinet;Protection component and sealing component, respectively set at the inside and outside of box door, and effectively block outside steam by protection component, and the tight sealing of protective cabinet and box door is realized when machine stops by sealing component, to avoid steam invasion protective cabinet leading to lubricating oil metamorphism;One-way ventilation component, symmetrically set at the side wall of protective cabinet, and cooperate with protection component.The utility model structure is reasonable and reliable, and form double protection barrier by the collaborative design of protection component, sealing component and one-way ventilation component, avoid external steam, dust to invade through ventilation slot, prevent protection loophole.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, and more specifically, to a sealing and protection device for a steam turbine shaft oil baffle ring assembly. Background Technology

[0002] In modern power plants and large industrial facilities, steam turbines are one of the core pieces of equipment, and their operating efficiency and reliability are crucial to the performance of the entire system. Oil baffle ring assemblies are key components in steam turbines, primarily used to prevent lubricating oil leakage into unwanted areas, ensuring effective lubrication between bearings and other moving parts, and preventing lubricating oil contamination of other system components or the environment.

[0003] Existing turbine shaft oil retaining ring assemblies, while capable of preventing most lubricating oil leakage along the journal clearance and initially isolating external dust and other impurities to maintain a basic bearing lubrication environment and reduce initial contamination, suffer from several drawbacks. These include a fixed sealing clearance that cannot adapt to shaft vibration and thermal expansion / contraction, a simple sealing structure lacking bidirectional steam and oil barrier design, leading to increased sealing clearance during operation, lubricating oil leakage, high-temperature steam intrusion into the bearing housing causing oil emulsification, accelerated seal failure, and increased wear on the bearing shell and journal due to impurities. Ultimately, this reduces the reliability of turbine operation, the stability of the lubrication system, and the service life of the sealing device, while also increasing equipment maintenance frequency and operating costs.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a sealing protection device for the turbine shaft oil baffle ring assembly to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A sealing and protection device for a turbine shaft oil baffle ring assembly includes: a protective housing, disposed outside the turbine oil baffle ring assembly and fixed by several bolts; a door, symmetrically disposed at both ends of the protective housing; a protective component and a sealing component, respectively disposed on the inner and outer sides of the door, wherein the protective component effectively blocks external steam, and the sealing component ensures a tight seal between the protective housing and the door when the machine stops, so as to prevent steam from entering the protective housing and causing the lubricating oil to deteriorate; and a one-way ventilation component, symmetrically disposed on the side wall of the protective housing and cooperating with the protective component.

[0008] Furthermore, to achieve targeted steam protection for the turbine oil baffle ring assembly and improve the initiative and reliability of the sealing protection, the protection component includes a driven member disposed inside the housing door; a linkage member is engaged on one side of the driven member, and a driving member is engaged on one side of the linkage member. The driven member includes an annular slide rail disposed inside the housing door, with an annular slider fitted on the outer circumference of the annular slide rail. Several blades are disposed on the inner circumference of the annular slider, with the inner ends of the blades connected to a fixed ring fitted on the turbine shaft. The blades are axial flow blades. The inner diameter of the fixed ring is larger than the inner diameter of the turbine shaft. A driven gear is disposed on the outer circumference of the annular slider. The linkage member includes a rotating shaft disposed on one side of the housing door, with a mounting bracket disposed on the outer circumference of the rotating shaft and on one side of the housing door; a first linkage gear meshing with the driven gear is disposed on the outer circumference of the rotating shaft; and a second linkage gear meshing with the driving member is disposed on the outer circumference of the rotating shaft. The driving component includes a drive gear disposed on the outer circumference of the turbine shaft and cooperating with a second linkage gear. The transmission ratio between the driven gear and the first linkage gear is greater than 1.5. The tooth ratio between the first linkage gear and the second linkage gear is greater than 2, and the transmission ratio between the second linkage gear and the drive gear is less than 3.

[0009] Furthermore, in order to effectively prevent the intrusion of external residual steam and the leakage of internal lubricating oil, the sealing assembly includes two sets of fixed blocks symmetrically arranged on the outside of the box door, a movable shaft between the two sets of fixed blocks, a closing plate on the outer circumference of the movable shaft, an arc groove between the two sets of closing plates, and the inner diameter of the circular groove formed by the two sets of arc grooves is larger than the inner diameter of the turbine shaft; a torsion spring is provided between the closing plate and the fixed block.

[0010] Furthermore, in order to enable the movable plate to adaptively open and close the ventilation slots according to the changes in air pressure inside the protective box, the one-way ventilation component includes ventilation slots arranged linearly around the protective box, a movable plate is provided on one side of the ventilation slot and on the inner wall of the protective box, and a torsion spring is provided at the movable axis of the movable plate.

[0011] Furthermore, to prevent the airflow from forming turbulent vortices inside the protective enclosure, the inner wall of the protective enclosure is symmetrically equipped with wind deflectors, and the opposite sides of the two sets of wind deflectors are rounded.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. This utility model has a reasonable and reliable structure and is easy to operate. Through the coordinated design of the protection component, sealing component, and one-way ventilation component, a double protective barrier is formed. When the turbine is running, the protection component, through the meshing transmission of the driving component, linkage component, and driven component, drives the blades to rotate and form a directional airflow, actively blocking the intrusion of external high-pressure steam. After shutdown, the sealing component drives the closing plate to automatically reset through the torsion spring, achieving a tight seal between the protective box and the shaft, fundamentally preventing the problem of lubricating oil emulsification and deterioration caused by steam intrusion, and effectively improving the reliability of turbine operation and maintenance cycle. The one-way ventilation component constructs a multi-channel, evenly distributed airflow path through the linearly arranged ventilation slots around the protective box. Combined with the movable plate with a torsion spring on the inner wall of the protective box, it forms an automatic opening and closing mechanism. When the turbine is running, the heat and oil mist inside the protective box form a positive pressure, pushing the movable plate to open to achieve directional ventilation and heat dissipation, maintaining the pressure balance inside the protective box. After shutdown, the movable plate automatically closes to prevent external steam and dust from entering through the ventilation slots, preventing protective loopholes.

[0014] 2. This utility model constructs a double protection system on both the inner and outer sides of the box door by setting up protective components and sealing components. It can not only actively block high-pressure steam during equipment operation, but also achieve absolute sealing of the box when the machine is stopped. This fundamentally eliminates the problem of lubricating oil emulsification and deterioration due to steam intrusion, and improves the reliability of steam turbine operation and maintenance cycle.

[0015] 3. This utility model, by setting up a one-way ventilation component, utilizes ventilation slots arranged linearly around the protective box to form a multi-channel, evenly distributed airflow path. Combined with an automatic opening and closing mechanism consisting of a movable plate installed on the inner wall of the box and a torsion spring, it realizes intelligent pressure balance and directional airflow management between the internal environment of the protective box and the external atmosphere. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a sealing protection device for a turbine shaft oil baffle ring assembly according to an embodiment of the present utility model (only part of the turbine main shaft is shown for clarity);

[0018] Figure 2 This is one of the partial cross-sectional views of a sealing and protection device for a turbine shaft oil baffle ring assembly according to an embodiment of the present utility model;

[0019] Figure 3This is a second partial sectional view of a sealing and protection device for a turbine shaft oil baffle ring assembly according to an embodiment of the present utility model;

[0020] Figure 4 yes Figure 3 Enlarged view of point A in the image;

[0021] Figure 5 This is a partial cross-sectional view of the protective component in a sealing protection device for a turbine shaft oil baffle ring assembly according to an embodiment of the present utility model;

[0022] Figure 6 This is a third partial cross-sectional view of a sealing and protection device for a turbine shaft oil baffle ring assembly according to an embodiment of the present utility model.

[0023] In the picture:

[0024] 1. Protective enclosure; 2. Enclosure door; 3. Protective components; 301. Driven component; 3011. Circular slide rail; 3012. Circular slider; 3013. Blade; 3014. Fixing ring; 3015. Driven gear; 302. Linkage component; 3021. Rotating shaft; 3022. Mounting bracket; 3023. First linkage gear; 3024. Second linkage gear; 303. Drive component; 3031. Drive gear; 4. Sealing assembly; 401. Fixing block; 402. Movable shaft; 403. Closing plate; 404. Arc groove; 5. One-way ventilation assembly; 501. Ventilation slot; 502. Movable plate; 6. Wind baffle. Detailed Implementation

[0025] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0026] According to an embodiment of the present invention, a sealing protection device for a turbine shaft oil baffle ring assembly is provided.

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-6As shown, a sealing and protection device for a turbine shaft oil baffle ring assembly according to an embodiment of the present invention includes: a protective housing 1, disposed outside the turbine oil baffle ring assembly and fixed by several bolts; a door 2, symmetrically disposed at both ends of the protective housing 1; a protection component 3 and a sealing component 4, respectively disposed on the inner and outer sides of the door 2, wherein the protection component 3 effectively blocks external steam, and the sealing component 4 achieves a tight seal between the protective housing 1 and the door 2 when the machine stops, so as to prevent steam from entering the protective housing 1 and causing the lubricating oil to deteriorate; and a one-way ventilation component 5, symmetrically disposed on the side wall of the protective housing 1 and cooperating with the protection component 3.

[0028] With the help of the above technical solution, a double protective barrier is formed by the coordinated design of the protection component 3, the sealing component 4 and the one-way ventilation component 5. When the steam turbine is running, the protection component drives the blade 3013 to rotate to form a directional airflow through the meshing transmission of the driving component 303, the linkage component 302 and the driven component 301, which actively blocks the intrusion of external high-pressure steam. After the turbine stops, the sealing component 4 drives the closing plate 403 to automatically reset through the torsion spring, so as to achieve a tight seal between the protective box 1 and the shaft, thereby eliminating the problem of lubricating oil emulsification and deterioration caused by steam intrusion from the root, and effectively improving the reliability of steam turbine operation and maintenance cycle. The unidirectional ventilation component 5 constructs a multi-channel, evenly distributed airflow path through the linearly arranged ventilation slots around the protective housing 1. Together with the movable plate 502 with a torsion spring on the inner wall of the protective housing 1, it forms an automatic opening and closing mechanism. When the steam turbine is running, the heat and oil mist inside the protective housing 1 form a positive air pressure, which pushes the movable plate 502 to open to achieve directional ventilation and heat dissipation, and maintain the pressure balance inside the protective housing 1. After the turbine stops, the movable plate 502 automatically closes to prevent external steam and dust from entering through the ventilation slots and prevent protection loopholes.

[0029] In one embodiment, the protection component 3 includes a driven member 301 disposed inside the door 2; a linkage member 302 is engaged on one side of the driven member 301, and a drive member 303 is engaged on one side of the linkage member 302.

[0030] The driven member 301 includes an annular slide rail 3011 disposed inside the door 2. An annular slider 3012 is fitted on the outer circumference of the annular slide rail 3011. A plurality of blades 3013 are disposed on the inner circumference of the annular slider 3012. A fixing ring 3014 is disposed between the plurality of blades 3013, and the inner diameter of the fixing ring 3014 is larger than the inner diameter of the turbine shaft. A driven gear 3015 is disposed on the outer circumference of the annular slider 3012.

[0031] The linkage 302 includes a rotating shaft 3021 disposed on one side of the door 2, a mounting bracket 3022 disposed on the outer circumference of the rotating shaft 3021 and on one side of the door 2; a first linkage gear 3023 that meshes with the driven gear 3015 disposed on the outer circumference of the rotating shaft 3021; ​​and a second linkage gear 3024 that cooperates with the driving component 303 disposed on the outer circumference of the rotating shaft 3021.

[0032] The driving component 303 includes a driving gear 3031 disposed on the outer circumference of the turbine shaft and cooperating with the second linkage gear 3024. This achieves targeted steam protection for the turbine oil baffle ring assembly, improving the initiative and reliability of the sealing protection.

[0033] The specific working principle of the protection component 3 is as follows: When the turbine shaft rotates, it drives the drive gear 3031 of the drive component 303, which is fixed on the outer circumference of the turbine shaft, to rotate synchronously. Since the drive gear 3031 cooperates with the second linkage gear 3024 of the linkage component 302, it drives the rotating shaft 3021 to rotate around its own axis. The mounting bracket 3022 provides stable support for the rotating shaft 3021, ensuring that it does not deviate during rotation. When the rotating shaft 3021 rotates, the first linkage gear 3023 on its outer circumference rotates synchronously. The first linkage gear 3023 meshes with the driven gear 3015 of the driven component 301, thereby driving the annular slider 3012 to move in a circle along the annular slide rail 3011. The annular slide rail 3011 provides precise guidance for the annular slider 3012, ensuring smooth rotation. When the annular slider 3012 rotates, several blades 3013 on its inner circumference rotate synchronously. The fixing ring 3014 firmly connects the blades 3013 into one piece, preventing the blades 3013 from loosening or shifting during high-speed rotation. Moreover, the inner diameter of the fixing ring 3014 is larger than the inner diameter of the turbine shaft, so it will not interfere with the shaft. During the high-speed rotation of the blades 3013, a directional airflow is formed. The pressure difference generated by the airflow is used to block external steam from entering the protective box 1, thereby achieving active protection against steam.

[0034] In one embodiment, the sealing assembly 4 includes two sets of fixing blocks 401 symmetrically arranged on the outside of the door 2. A movable shaft 402 is disposed between the two sets of fixing blocks 401. A closing plate 403 is disposed on the outer circumferential wall of the movable shaft 402. An arc-shaped groove 404 is formed between the two sets of closing plates 403, and the inner diameter of the circular groove formed by the two sets of arc-shaped grooves 404 is larger than the inner diameter of the turbine shaft. A torsion spring is provided between the closing plate 403 and the fixing block 401. This effectively prevents the intrusion of external residual steam and the leakage of internal lubricating oil.

[0035] The specific working principle of the sealing assembly 4 is as follows: When the equipment is running, the force generated by the rotation of the turbine shaft or the linkage with related components pushes the two sets of closing plates 403 to open outward around the movable shaft 402. At this time, the torsion spring (not shown in the figure, which is the prior art) between the closing plate 403 and the fixed block 401 is twisted and stored. Since the inner diameter of the circular groove formed by the arc groove 404 of the two sets of closing plates 403 is larger than the inner diameter of the turbine shaft, the closed plate 403 in the open state will not interfere with the rotating shaft, ensuring the normal operation of the equipment. When the equipment stops, the shaft stops rotating, the force on the closing plate 403 disappears, the torsion spring releases its stored force, generating a reverse torsional force to drive the movable shaft 402 to rotate, which in turn drives the two sets of closing plates 403 to approach each other and fit precisely. The two sets of arc grooves 404 together form a sealing structure adapted to the turbine shaft, tightly fitting the outer circumference of the shaft. At the same time, the closing plate 403 forms a tightly fitting sealing surface with the protective box 1 and the box door 2, realizing the airtight sealing of the protective box 1 and the box door 2 when the machine stops, effectively preventing external residual steam from entering the interior of the protective box 1, and preventing the leakage of lubricating oil inside the box.

[0036] In one embodiment, the unidirectional ventilation assembly 5 includes ventilation slots 501 arranged linearly around the protective housing 1. A movable plate 502 is provided on one side of the ventilation slots 501 and located on the inner wall of the protective housing 1, and a torsion spring is provided at the movable axis of the movable plate 502. This enables the movable plate 502 to adaptively open and close the ventilation slots 501 according to changes in the internal air pressure of the protective housing 1.

[0037] The specific working principle of the one-way ventilation component 5 is as follows: When the equipment is running, heat and oil mist generated inside the chamber create positive air pressure, which pushes the movable plate 502 to rotate around the axis and open the ventilation slot 501, while the torsion spring stores energy. The linearly arranged ventilation slots 501 form a multi-channel airflow path, quickly expelling the high-temperature gas and oil mist from the chamber, thus achieving ventilation and heat dissipation. After the equipment stops, the air pressure inside the chamber returns to normal, and the torsion spring releases its stored energy, driving the movable plate 502 to reset and close the ventilation slot 501, blocking the intrusion of external steam and dust. The entire process requires no additional power.

[0038] In one embodiment, for the aforementioned protective enclosure 1, wind deflectors 6 are symmetrically arranged on the inner wall of the protective enclosure 1, and the opposite sides of the two sets of wind deflectors 6 are rounded. This prevents the airflow from forming turbulent vortices within the protective enclosure 1.

[0039] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0040] In practical applications, during equipment operation, the turbine shaft rotation drives the drive gear 3031 of the drive component 303 to rotate. Through the gear transmission of the linkage component 302, the annular slider 3012 of the driven component 301 rotates along the annular slide rail 3011, thereby driving the blades 3013 to rotate and form a directional airflow, actively blocking the intrusion of external steam. At this time, the closing plate 403 of the sealing component 4 is pushed open by the force related to the shaft, and the torsion spring stores force without interfering with the normal operation of the shaft. At the same time, the heat and oil mist generated by the operation of the components inside the box form a positive pressure, which pushes the movable plate 502 of the one-way ventilation component 5 to open the ventilation slot 501. The high-temperature gas and oil mist are quickly discharged through the linearly arranged ventilation slots around the perimeter, achieving ventilation and heat dissipation. During equipment shutdown, the shaft stops rotating, and the blades 3013 of the protection component 3 also stop rotating; the torsion spring of the sealing component 4 releases its stored force, driving the closing plate 403 to reset and fit against the shaft, forming a tight seal to prevent residual steam from entering and lubricating oil from leaking; the torsion spring of the one-way ventilation component 5 also resets simultaneously, driving the movable plate 502 to close the ventilation slot 501, preventing external impurities from entering through the ventilation slot.

[0041] The specific working principles of the protection component 3, the sealing component 4, and the one-way ventilation component 5 are as described above.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing and protective device for a turbine shaft oil baffle ring assembly, characterized in that, include: The protective housing is located outside the turbine oil baffle ring assembly and is fixed by several bolts; The doors are symmetrically located at both ends of the protective enclosure. The protective component and the sealing component are respectively installed on the inner and outer sides of the box door. The protective component effectively blocks external steam, and the sealing component ensures a tight seal between the protective box and the box door when the machine stops, so as to prevent steam from entering the protective box and causing the lubricating oil to deteriorate. One-way ventilation components are symmetrically arranged on the side walls of the protective enclosure and work in conjunction with the protective components.

2. The sealing and protection device for a turbine shaft oil baffle ring assembly according to claim 1, characterized in that, The protective assembly includes a driven member disposed inside the door; A linkage is engaged on one side of the driven member, and a driving member is engaged on one side of the linkage.

3. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 2, characterized in that, The driven component includes an annular slide rail disposed inside the box door. An annular slider is fitted on the outer circumference of the annular slide rail. A plurality of blades are disposed on the inner circumference of the annular slider. The inner ends of the blades are connected to a fixed ring sleeved on the turbine shaft. The inner diameter of the fixed ring is larger than the inner diameter of the turbine shaft. The outer circumference of the annular slider is provided with a driven gear.

4. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 3, characterized in that, The blades are axial flow blades.

5. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 3, characterized in that, The linkage includes a rotating shaft disposed on one side of the box door, and a mounting bracket is provided on the outer circumference of the rotating shaft and on one side of the box door. The outer circumference of the rotating shaft is provided with a first linkage gear that meshes with the driven gear; The outer circumference of the rotating shaft is provided with a second linkage gear that cooperates with the driving component.

6. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 5, characterized in that, The driving component includes a driving gear disposed on the outer circumference of the turbine shaft and cooperating with the second linkage gear.

7. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 6, characterized in that, The sealing assembly includes two sets of fixing blocks symmetrically arranged on the outside of the box door, a movable shaft between the two sets of fixing blocks, a closing plate on the outer circumference of the movable shaft, an arc groove between the two sets of closing plates, and the inner diameter of the circular groove formed by the two sets of arc grooves is larger than the inner diameter of the turbine shaft. A torsion spring is provided between the closing plate and the fixing block.

8. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 5, characterized in that, The transmission ratio between the driven gear and the first linkage gear is greater than 1.

5.

9. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 6, characterized in that, The gear ratio between the first linkage gear and the second linkage gear is greater than 2, and the transmission ratio between the second linkage gear and the drive gear is less than 3.

10. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 1, characterized in that, The one-way ventilation assembly includes ventilation slots arranged linearly around the protective housing. A movable plate is provided on one side of the ventilation slot and on the inner wall of the protective housing, and a torsion spring is provided at the movable axis of the movable plate.

11. A sealing and protective device for a turbine shaft oil baffle ring assembly according to claim 1, characterized in that, The inner wall of the protective box is symmetrically equipped with wind baffles, and the opposite side of the two sets of wind baffles is rounded.

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