End face sealing device for main shaft of water turbine controlled by compressed air

Abstract

The utility model discloses a compressed air control water turbine spindle end face sealing device. A supporting frame is arranged on one side of a water turbine spindle. One end of the rotating ring is rotatably arranged on the water turbine main shaft, and the other end of the rotating ring is located above the supporting frame. The stainless steel wear-resistant ring is arranged at the bottom of the rotating ring and located in the supporting frame. The high-temperature-resistant and wear-resistant self-lubricating sealing ring is arranged in the support frame, and forms a rotary attached sealing surface with the stainless steel wear-resistant ring; the sealing filler ring is arranged in the support frame and is positioned below the high-temperature-resistant and wear-resistant self-lubricating sealing ring; and the engineering plastic thrust ring is arranged in the support frame. Therefore, by the adoption of the high-temperature-resistant and wear-resistant self-lubricating sealing ring and the compressed air adjusting mechanism, the sealing effect is remarkably improved, water leakage is reduced, the service life of equipment is prolonged, abrasion is reduced through high-performance materials, water leakage is effectively collected and treated through a specific water leakage path, and equipment safety is ensured. The popularization value is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydroelectric station hydro -generator unit, especially to compressed air control water turbine main shaft end face sealing device. BACKGROUND

[0002] The working seal of the water turbine main shaft of the hydroelectric station hydro -generator unit faces many challenges during operation. These challenges mainly come from the wear of the sealing material and the irrationality of the sealing structure design. These problems are intertwined with each other and jointly cause the phenomenon of large water leakage, which becomes a major safety hazard in the operation of the hydroelectric station.

[0003] The wear of the sealing material is an inevitable process. Especially under the action of high-speed rotation and high-pressure water flow, the friction and wear of the sealing surface will be intensified, thereby reducing the sealing effect. Once the sealing material is worn to a certain extent, the leakage phenomenon will appear, which not only causes the waste of water resources, but also may threaten the stable operation of the unit. For example, the leakage may erode the metal parts inside the unit, causing the parts to corrode and damage, and then causing more serious failures.

[0004] In addition, the irrationality of the sealing structure design is also one of the important reasons for the large amount of water leakage. If the design of the sealing structure does not fully consider the factors such as water flow characteristics, material performance and operating conditions, it is difficult to achieve the ideal sealing effect. For example, the problems such as too large gap of the sealing surface, insufficient elasticity or too strong rigidity of the sealing material, etc. may cause poor sealing effect, thereby causing the leakage phenomenon.

[0005] These sealing problems not only affect the operating efficiency of the unit, but also greatly shorten the service life of the sealing device. Under the existing technical conditions, the service life of many sealing devices often cannot meet the demand of more than one overhaul cycle. This means that the hydroelectric station needs to frequently replace and overhaul the sealing device, which not only increases the maintenance cost, but also affects the continuous and stable operation of the unit. Frequent shutdown for maintenance not only reduces the power generation efficiency of the hydroelectric station, but also may adversely affect the stable operation of the power grid.

[0006] Therefore, the working seal problem of the water turbine main shaft of the hydroelectric station hydro -generator unit needs to be solved, and a new type of high-efficiency and durable sealing device needs to be developed to improve the sealing performance, prolong the service life and reduce the maintenance cost, so as to ensure the safe and stable operation of the hydroelectric station. SUMMARY

[0007] The utility model aims at at least in a certain extent solves one of the technical problems in the prior art.

[0008] Therefore, the purpose of this utility model is to propose a compressed air-controlled sealing device for the main shaft end face of a hydro turbine. It adopts a high-temperature resistant, wear-resistant, self-lubricating sealing ring and a compressed air regulating mechanism, which significantly improves the sealing effect, reduces water leakage, and extends the equipment life. High-performance materials reduce wear, and specific leakage paths effectively collect and treat leakage, ensuring equipment safety. This device has been applied to hydropower station turbine generator sets and has been verified in practice, making it highly valuable for promotion.

[0009] To achieve the above objectives, this utility model proposes a compressed air-controlled sealing device for the end face of a turbine main shaft, comprising a turbine main shaft, a support frame, a rotating ring, a stainless steel anti-wear ring, a high-temperature resistant, wear-resistant, self-lubricating sealing ring, a sealing packing ring, an engineering plastic thrust ring, a compressed air storage chamber, and a compressed air inlet. The support frame is disposed on one side of the turbine main shaft; one end of the rotating ring is rotatably mounted on the turbine main shaft, and the other end is located above the support frame; the stainless steel anti-wear ring is disposed at the bottom of the rotating ring and located within the support frame; the high-temperature resistant, wear-resistant, self-lubricating sealing ring is disposed within the support frame and forms a rotating, contacting sealing surface with the stainless steel anti-wear ring; the sealing packing ring is disposed within the support frame and located within the... Below the high-temperature wear-resistant self-lubricating sealing ring; the engineering plastic thrust ring is disposed within the support frame, and the engineering plastic thrust ring is located below the sealing packing ring; the compressed air energy storage chamber is disposed at the bottom of the support frame; the compressed air replenishment hole is disposed on the side wall of the support frame located on one side of the compressed air energy storage chamber; a sealing leakage path is provided on one side of the bottom of the support frame, and a moving pair interface leakage path is provided between the stainless steel anti-wear ring and the high-temperature wear-resistant self-lubricating sealing ring; wherein, the high-temperature wear-resistant self-lubricating sealing ring, the sealing packing ring, the engineering plastic thrust ring, and the compressed air energy storage chamber are assembled into an air spring working structure, and the high-temperature wear-resistant self-lubricating sealing ring and the stainless steel anti-wear ring form a rotating contact sealing surface.

[0010] This utility model relates to a compressed air-controlled sealing device for the main shaft end face of a hydroelectric turbine. It employs a high-temperature resistant, wear-resistant, self-lubricating sealing ring and a compressed air regulating mechanism, which significantly improves the sealing effect, reduces water leakage, and extends equipment life. High-performance materials reduce wear, and a specific leakage path effectively collects and treats leakage, ensuring equipment safety. This device has been applied to hydroelectric turbine generator sets in hydropower stations and has been verified in practice, demonstrating its significant potential for widespread application.

[0011] In addition, the compressed air-controlled turbine main shaft end face sealing device proposed in the application may also have the following additional technical features:

[0012] Specifically, it also includes a compressed air pressure variation mechanism for adjusting the fit between the high-temperature wear-resistant self-lubricating sealing ring and the stainless steel anti-wear ring.

[0013] Specifically, the sealing water leakage path and the motion pair interface water leakage path are designed as predetermined water leakage collection and discharge paths.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] (1) The high-temperature-resistant and wear-resistant self-lubricating sealing ring is combined with the compressed air pressure adjusting mechanism to realize efficient sealing effect and reduce water leakage.

[0016] (2) The high-temperature-resistant and wear-resistant self-lubricating sealing ring is composed of high-performance materials, has good wear resistance and self-lubricating property, reduces the wear rate of the sealing surface, and prolongs the service life of the equipment.

[0017] (3) By designing specific water leakage collection and discharge paths (sealing water leakage path and motion pair interface water leakage path), effective collection and treatment of water leakage are realized, and adverse effects of water leakage on the equipment are avoided.

[0018] (4) The device is suitable for hydroelectric generating set and has wide applicability and promotional value after actual application verification.

[0019] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the utility model will become apparent and easy to understand from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0021] Fig. 1 It is a perspective view of a compressed air controlled water turbine main shaft end face sealing device of an embodiment of the utility model;

[0022] Fig. 2 It is a plane structure schematic view of a compressed air controlled water turbine main shaft end face sealing device of an embodiment of the utility model.

[0023] As shown in the figure: 1, water turbine main shaft; 2, support frame; 3, rotating ring; 4, stainless steel wear-resistant ring; 5, high-temperature-resistant and wear-resistant self-lubricating sealing ring; 6, sealing packing ring; 7, engineering plastic thrust ring; 8, compressed air energy storage chamber; 9, compressed air air supplement hole; 21, sealing water leakage path; 22, motion pair interface water leakage path. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0025] The compressed air-controlled turbine main shaft end face sealing device of this utility model embodiment will be described below with reference to the accompanying drawings.

[0026] like Figs. 1-2 As shown, the compressed air-controlled turbine main shaft end face sealing device of this utility model embodiment includes a turbine main shaft 1, a support frame 2, a rotating ring 3, a stainless steel anti-wear ring 4, a high-temperature wear-resistant self-lubricating sealing ring 5, a sealing packing ring 6, an engineering plastic thrust ring 7, a compressed air energy storage chamber 8, and a compressed air inlet 9. The support frame 2 is located on one side of the turbine main shaft 1. One end of the rotating ring 3 is rotatably mounted on the turbine main shaft 1, and the other end is located above the support frame 2. The stainless steel anti-wear ring 4 is located at the bottom of the rotating ring 3 and inside the support frame 2. The high-temperature wear-resistant self-lubricating sealing ring 5 is located inside the support frame 2 and forms a rotating, contacting sealing surface with the stainless steel anti-wear ring 4. The sealing packing ring 6 is located inside the support frame 2, and the sealing packing ring 6 is positioned... Below the high-temperature wear-resistant self-lubricating sealing ring 5, the engineering plastic thrust ring 7 is set inside the support frame 2, and the engineering plastic thrust ring 7 is located below the sealing packing ring 6. The compressed air energy storage chamber 8 is set at the bottom of the support frame 2, and the compressed air replenishment hole 9 is set on the side wall of the support frame 2 located on one side of the compressed air energy storage chamber 8. A sealing leakage route 21 is set on one side of the bottom of the support frame 2. A moving pair interface leakage route 22 is set between the stainless steel anti-wear ring 4 and the high-temperature wear-resistant self-lubricating sealing ring 5. The high-temperature wear-resistant self-lubricating sealing ring 5, the sealing packing ring 6, the engineering plastic thrust ring 7 and the compressed air energy storage chamber 8 are assembled into an air spring working structure. The high-temperature wear-resistant self-lubricating sealing ring 5 and the stainless steel anti-wear ring 4 form a rotating contact sealing surface.

[0027] It is understood that the turbine main shaft 1 is the core component of the entire sealing device. It is located at one end of the device and is used to drive the turbine to rotate.

[0028] Support frame 2 is located on one side of the turbine main shaft 1 and is used to support and fix other components. It provides a stable platform to ensure the stable operation of the sealing device.

[0029] One end of the rotating ring 3 is rotatably arranged on the water turbine main shaft 1, and the other end is located above the support frame 2. The rotating ring 3 is used to protect the main shaft and the sealing device, and serves as the installation basis for other components.

[0030] The stainless steel wear-resistant ring 4 is arranged at the bottom of the rotating ring 3 and inside the support frame 2. It serves as the moving pair ring and forms a rotating sealing surface with the high-temperature and wear-resistant self-lubricating sealing ring 5, ensuring the sealing effect.

[0031] The high-temperature and wear-resistant self-lubricating sealing ring 5 is arranged inside the support frame 2 and forms a rotating sealing surface with the stainless steel wear-resistant ring 4.

[0032] The sealing filler ring 6 is arranged inside the support frame 2 and below the high-temperature and wear-resistant self-lubricating sealing ring 5. It is used to fill the gap between the sealing ring and the main shaft, further enhancing the sealing effect.

[0033] The engineering plastic thrust ring 7 is arranged inside the support frame 2 and below the sealing filler ring 6. It provides thrust support to ensure that the sealing device can maintain stability during operation.

[0034] The compressed air energy storage chamber 8 is arranged at the bottom of the support frame 2. It stores compressed air to provide power for sealing compensation. When the sealing ring is slightly worn, the compressed air energy storage chamber 8 can release compressed air for immediate compensation to maintain the fit of the sealing surface.

[0035] The compressed air supplement hole 9 is arranged on the side wall of the support frame 2 on one side of the compressed air energy storage chamber 8. It is used to supplement compressed air to the compressed air energy storage chamber 8 to ensure that the energy storage chamber always has enough compressed air supply.

[0036] Water leakage collection and treatment:

[0037] The support frame 2 is provided with a sealing water leakage route 21 at the bottom of one side, which is used to collect and discharge water leakage. When the sealing device is slightly leaked, the water leakage will flow out along the sealing water leakage route 21, avoiding adverse effects on the equipment.

[0038] The moving pair interface water leakage route 22 is arranged between the stainless steel wear-resistant ring 4 and the high-temperature and wear-resistant self-lubricating sealing ring 5. This route ensures that the water leakage can be discharged along the predetermined route without affecting the sealing effect. At the same time, it also helps to monitor the running state of the sealing device and timely discover and handle potential problems.

[0039] Air spring working structure:

[0040] The air spring working structure is assembled by the high-temperature wear-resistant self-lubricating sealing ring 5, the sealing filler ring 6, the engineering plastic thrust ring 7 and the compressed air energy storage chamber 8. The structure uses the compressed air of the compressed air energy storage chamber to provide sealing compensation, thereby ensuring the sealing effect. When the sealing ring is worn, the air spring working structure can compensate in time, keep the adhesion of the sealing surface and prolong the service life of the sealing device.

[0041] In an embodiment of the present application, as shown in Figs. 1-2 The high-temperature wear-resistant self-lubricating sealing ring 5 is composed of the following materials: high-temperature wear-resistant aramid, high-temperature wear-resistant self-lubricating polytetrafluoroethylene and graphene.

[0042] Among them, it can be understood that the high-temperature wear-resistant self-lubricating sealing ring 5 is a key component in the embodiment of the present application, and the sealing ring is composed of the following three high-performance materials:

[0043] High-temperature wear-resistant aramid:

[0044] Aramid is a high-performance synthetic fiber with extremely high strength and wear resistance, and can maintain stable performance in high-temperature environment. In the high-temperature wear-resistant self-lubricating sealing ring 5, aramid is used as the main bearing material, which can effectively resist the friction and wear generated during the rotation of the main shaft, and ensure the long-term stable operation of the sealing ring.

[0045] High-temperature wear-resistant self-lubricating polytetrafluoroethylene:

[0046] Polytetrafluoroethylene (PTFE) is a high molecular material with excellent lubricating performance and chemical stability. In the high-temperature wear-resistant self-lubricating sealing ring 5, the high-temperature wear-resistant self-lubricating polytetrafluoroethylene is used, which can maintain a low friction coefficient in high-temperature environment, realize self-lubricating effect, reduce the friction loss of the sealing surface and improve the sealing efficiency.

[0047] Graphene:

[0048] Graphene is a new type of nanomaterial with extremely high thermal conductivity and mechanical strength. In the high-temperature wear-resistant self-lubricating sealing ring 5, the addition of graphene can significantly improve the thermal stability and wear resistance of the sealing ring, and enhance the overall strength of the material, prolong the service life of the sealing ring.

[0049] The high-temperature wear-resistant self-lubricating sealing ring 5 and the stainless steel wear-resistant ring 4 form a rotating and adhering sealing surface, which realizes high-efficiency sealing effect through precise cooperation and gap adjustment. At the same time, the synergistic effect of the sealing filler ring 6 and the engineering plastic thrust ring 7 further enhances the stability and reliability of the sealing device. The instant compensation mechanism of the compressed air energy storage chamber 8 and the compressed air compensation hole 9 ensures that the sealing ring can be compensated in time when it is slightly worn, and the adhesion of the sealing surface is maintained.

[0050] In an embodiment of the present application, as shown in Figs. 1-2 It also includes a compressed air pressure change mechanism for adjusting the adhesion between the high-temperature-resistant and wear-resistant self-lubricating sealing ring 5 and the stainless steel wear-resistant ring 4.

[0051] It can be understood that this mechanism adjusts the pressure in the compressed air energy storage chamber 8, thereby achieving precise control of the adhesion between the high-temperature-resistant and wear-resistant self-lubricating sealing ring 5 and the stainless steel wear-resistant ring 4.

[0052] By adjusting the opening of the compressed air supplement hole 9, the speed and amount of compressed air supplement into the compressed air energy storage chamber 8 are controlled. When the adhesion needs to be increased, the control system will open the air supplement hole to allow more compressed air to enter the energy storage chamber, thereby increasing the pressure; conversely, when the adhesion needs to be reduced (usually to prevent wear caused by excessive compression), the control system will reduce the opening of the air supplement hole or even close the air supplement hole, so that the pressure in the energy storage chamber gradually decreases.

[0053] The compressed air pressure change mechanism can maintain the dynamic balance of the adhesion between the high-temperature-resistant and wear-resistant self-lubricating sealing ring 5 and the stainless steel wear-resistant ring 4. This balance not only ensures the stability and durability of the sealing effect, but also reduces wear and energy consumption caused by improper adhesion.

[0054] In an embodiment of the present application, as shown in Figs. 1-2 The sealing water leakage path 21 and the motion pair interface water leakage path 22 are designed as predetermined water leakage collection and discharge paths.

[0055] It can be understood that the sealing water leakage path 21, through precise grooves or pipeline structures, ensures that the water leaked from the sealing surface can be quickly and effectively collected, avoiding the water directly flowing into the generator, causing potential electrical faults or corrosion problems.

[0056] The collected water will be guided to the designated discharge port through the sealing water leakage path 21, thereby realizing directional discharge and maintaining the dryness and cleanliness of the generator interior.

[0057] The motion pair interface water leakage path 22 is designed for the interface leakage between other moving parts (such as main shafts, bearings, etc.) inside the generator. The motion pair interface water leakage path 22 adopts a flexible design that can adapt to the relative movement and deformation between different moving parts, ensuring that the water leakage can be continuously and effectively collected.

[0058] The sealing water leakage path 21 and the water leakage path 22 of the pair of movements jointly constitute the complete water leakage collection and drainage system in the embodiment of the utility model.

[0059] In an embodiment of the utility model, as shown in the figure, Figs. 1-2 The device is applicable to the water turbine generator set of a hydropower station and has been verified by actual application.

[0060] It can be understood that the device has been verified by actual application and has achieved remarkable effects.

[0061] Shiban hydropower plant case:

[0062] Before the reconstruction, the original rubber end face sealing of Shiban hydropower plant was seriously worn, leading to large water leakage and multiple water-flooded guide bearing accidents, which seriously affected the stable operation of the unit.

[0063] The reconstruction measure is to perform technical reconstruction, that is, to use the compressed air control water turbine main shaft end face sealing device in the embodiment of the utility model.

[0064] After the reconstruction, the water leakage of the unit is significantly reduced, the wear of the stainless steel wear-resistant ring is greatly reduced in four years, and the water pumping period of the original deep well pump is greatly extended.

[0065] It should be noted that the control mode of the application can be automatically controlled by a controller, and the control mode of the controller can be realized by simple programming by a person skilled in the art, which is common knowledge in the art, and the application mainly protects the mechanical structure, so the control mode and circuit connection are not explained in detail.

[0066] Specific use process or operation method:

[0067] I. Device installation and debugging

[0068] 1. Install the support frame 2:

[0069] Fix the support frame 2 on one side of the water turbine main shaft 1 to ensure that the support frame is stable and accurately positioned.

[0070] 2. Install the rotating ring 3:

[0071] One end of the rotating ring 3 is rotatably installed on the water turbine main shaft 1, and the other end is placed above the support frame 2 to ensure that the rotating ring can rotate freely without obvious jamming.

[0072] 3. Install the stainless steel wear ring 4:

[0073] Install the stainless steel wear ring 4 at the bottom of the rotating ring 3, ensuring it is located within the support frame 2, forming a rotating sealing surface with the high-temperature and wear-resistant self-lubricating sealing ring 5 installed later.

[0074] 4. Install the high-temperature and wear-resistant self-lubricating sealing ring 5:

[0075] Install the high-temperature and wear-resistant self-lubricating sealing ring 5 within the support frame 2, forming a tight sealing surface with the stainless steel wear ring 4. Ensure that the material and size of the sealing ring meet the design requirements.

[0076] 5. Install the sealing packing ring 6:

[0077] Install the sealing packing ring 6 below the high-temperature and wear-resistant self-lubricating sealing ring 5 to fill the gap between the sealing ring and the main shaft, enhancing the sealing effect.

[0078] 6. Install the engineering plastic thrust ring 7:

[0079] Install the engineering plastic thrust ring 7 below the sealing packing ring 6 to provide thrust support, ensuring that the sealing device remains stable during operation.

[0080] 7. Install the compressed air energy storage chamber 8:

[0081] Install the compressed air energy storage chamber 8 at the bottom of the support frame 2, ensuring it is tightly connected to other parts of the sealing device.

[0082] 8. Connect the compressed air charging hole 9:

[0083] Connect the compressed air charging hole 9 to the side wall of the support frame 2 on one side of the compressed air energy storage chamber 8, ensuring that compressed air can smoothly enter the energy storage chamber.

[0084] 9. Set the water leakage collection route:

[0085] Set the sealing water leakage route 21 on one side of the bottom of the support frame 2, ensuring that the leaked water can be discharged along the predetermined route.

[0086] Set the motion pair interface water leakage route 22 between the stainless steel wear ring 4 and the high-temperature and wear-resistant self-lubricating sealing ring 5, ensuring that the leaked water can be continuously and effectively collected.

[0087] II. Device startup and operation

[0088] 1. Pre-startup inspection:

[0089] Check whether all parts are installed in place, ensuring that there is no looseness or damage.

[0090] Check if the pressure in the compressed air storage chamber 8 reaches the set value, ensuring sufficient compressed air supply.

[0091] Check if the sealing water leakage path 21 and the motion pair interface water leakage path 22 are unobstructed.

[0092] 2. Starting device:

[0093] Start the water turbine to make the main shaft 1 begin to rotate.

[0094] Observe the fit between the rotating ring 3, the stainless steel wear-resistant ring 4, and the high-temperature wear-resistant self-lubricating sealing ring 5 to ensure good sealing effect.

[0095] 3. Monitoring and adjustment:

[0096] Monitor and adjust the fit between the high-temperature wear-resistant self-lubricating sealing ring 5 and the stainless steel wear-resistant ring 4 through the compressed air pressure change mechanism.

[0097] According to the actual situation, timely adjust the opening of the compressed air supplement hole 9 to maintain the stable pressure in the energy storage chamber 8.

[0098] Regularly check the water leakage of the sealing water leakage path 21 and the motion pair interface water leakage path 22, and clean and maintain in time.

[0099] Three, device maintenance and repair

[0100] 1. Regular inspection:

[0101] Regularly conduct a comprehensive inspection of the device, including the wear and tear of each component, the sealing effect, and the pressure of the compressed air energy storage chamber 8, etc.

[0102] Check if the material of the high-temperature wear-resistant self-lubricating sealing ring 5 has changed, and replace it in time if there is wear or aging phenomenon.

[0103] 2. Cleaning and maintenance:

[0104] Regularly clean the dirt and impurities on the surface of the sealing device to keep the device clean.

[0105] Regularly clean the compressed air energy storage chamber 8 and the supplement hole 9 to ensure that the compressed air channel is unobstructed.

[0106] 3. Fault handling:

[0107] If the device has leakage, abnormal noise, or unstable pressure, etc. fault phenomenon, should be immediately stopped checking and troubleshooting.

[0108] For faults that cannot be handled by oneself, should contact professional maintenance personnel in time for repair.

[0109] In conclusion, the compressed air control water turbine main shaft end face sealing device of the embodiment of the utility model, adopt high temperature resistant wear resistant self lubricating sealing ring and compressed air adjusting mechanism, significantly improve the sealing effect, reduce the water leakage, prolong the equipment life, high performance material reduce the abrasion, specific water leakage path effectively collect and handle the water leakage, ensure the equipment safety, the device has been applied to the hydroelectric generating set, and through the practice verification, it is very worth promoting.

[0110] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0111] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0112] Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can change, modify, replace and deform the above-mentioned embodiments within the scope of the present application.

Claims

1. A compressed air-controlled sealing device for the end face of a turbine main shaft, characterized in that, The components include the turbine main shaft (1), support frame (2), rotating ring (3), stainless steel anti-wear ring (4), high-temperature wear-resistant self-lubricating sealing ring (5), sealing packing ring (6), engineering plastic thrust ring (7), compressed air storage chamber (8), and compressed air replenishment port (9). The support frame (2) is located on one side of the turbine main shaft (1); One end of the rotating ring (3) is rotatably mounted on the turbine main shaft (1), and the other end is located above the support frame (2); The stainless steel anti-wear ring (4) is disposed at the bottom of the rotating ring (3) and located inside the support frame (2); The high-temperature resistant and wear-resistant self-lubricating sealing ring (5) is set inside the support frame (2) and forms a rotating contact sealing surface with the stainless steel anti-wear ring (4); The sealing packing ring (6) is disposed inside the support frame (2), and the sealing packing ring (6) is located below the high temperature resistant, wear resistant, and self-lubricating sealing ring (5); The engineering plastic thrust ring (7) is disposed inside the support frame (2), and the engineering plastic thrust ring (7) is located below the sealing packing ring (6); The compressed air energy storage chamber (8) is located at the bottom of the support frame (2); The compressed air replenishment port (9) is located on the side wall of the support frame (2) on one side of the compressed air energy storage chamber (8); A sealing water leakage route (21) is provided on one side of the bottom of the support frame (2), and a moving pair interface water leakage route (22) is provided between the stainless steel anti-wear ring (4) and the high temperature wear-resistant self-lubricating sealing ring (5). The high-temperature wear-resistant self-lubricating sealing ring (5), the sealing packing ring (6), the engineering plastic thrust ring (7), and the compressed air energy storage chamber (8) are assembled into an air spring working structure, and the high-temperature wear-resistant self-lubricating sealing ring (5) and the stainless steel anti-wear ring (4) form a rotating contact sealing surface.

2. The compressed air-controlled turbine main shaft end face sealing device according to claim 1, characterized in that, It also includes a compressed air pressure variation mechanism for adjusting the fit between the high-temperature wear-resistant self-lubricating sealing ring (5) and the stainless steel anti-wear ring (4).

3. The compressed air-controlled turbine main shaft end face sealing device according to claim 1, characterized in that, The sealing leakage path (21) and the moving part interface leakage path (22) are designed as predetermined leakage collection and discharge paths.

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