Automatic oil replenishing device for flexible floating sealing ring of generator end cover
By designing an automatic oil replenishment device on the end cover of the generator and automatically replenishing turbine oil using capillary effect and gravity, the problem of carbonization and dust pollution of the flexible sealing ring due to oil deficiency is solved, and the lubrication needs are met and the sealing performance is improved. .
Patent Information
- Application Number
- CN202010695828.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-07-16
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2040-07-16
AI Technical Summary
The lack of automatic lubricating turbine oil on the end cover of the generator causes the flexible floating seal ring to be carbonized due to oil deficiency, and the existing hard filler contacts with the floating seal ring will introduce dust pollution and friction heat deformation, making it difficult to effectively seal.
An automatic oil replenishment device is designed, using a floating sealing ring composed of multiple flexible sealing bodies. The felt oil core and sponge are automatically replenished with capillary effect and gravity, and combined with the maze oil replenishment wire to store and distribute excess oil. Ensure sealing performance and lubrication requirements.
Automatic lubrication and supplement of flexible seals is realized, which avoids carbonization and dust pollution, ensures the satisfaction of sealing performance and lubrication requirements, and prevents excess oil from entering the generator.
Smart Images
Figure CN111911628B_ABST
Abstract
Description
Technical field:
[0001] The invention relates to a device for automatically replenishing oil for a flexible floating sealing ring of a generator end cover. Background technology:
[0002] At present, the seals at the end covers at both ends of the generator and the dynamic and static seals of the main shaft still adopt the comb-tooth method. In this method, there is a certain gap between the comb-tooth surface and the main shaft surface. Suspended dust, oil mist, salty water vapor or other floating objects in the atmosphere will be sucked into the generator, causing the insulation resistance of the stator and rotor coils to decrease, posing a hidden danger to the long-term safe operation of the generator. The maintenance personnel also have a lot of work intensity when cleaning the stator and rotor coils and iron cores. The hard filler contact floating seal ring or flexible floating seal ring used in some seat-type bearings cannot be installed on the generator end cover to prevent suspended impurities in the atmosphere from entering the generator, because the hard filler contacting the floating seal ring is very easy to grind off dust to pollute the generator and also produce frictional heat deformation, so it cannot be used on the end cover at all; the flexible floating seal ring has good sealing performance, but requires a suitable amount of turbine oil for compensatory lubrication, otherwise the flexible floating seal ring will be carbonized and damaged due to lack of lubricating turbine oil, and there is no turbine oil replenishing device or pipeline on the generator end cover to replenish the flexible floating seal ring for lubrication. Even if there is, it must meet the requirement that the turbine oil required for lubrication of the flexible floating seal ring can only be replenished when the generator is running, and it will not be replenished when it stops running, and the turbine oil cannot be replenished too much to avoid excess turbine oil entering the generator and causing secondary pollution, that is, the flexible floating seal ring must be replenished with as much lubricating turbine oil as needed, and the amount of turbine oil lost due to friction must be replenished slowly and evenly. This technical problem is urgently needed to be solved in this field. Summary of the invention:
[0003] The present invention aims to provide an automatic oil replenishing device that meets the lubrication requirements of the flexible floating sealing ring of the generator end cover, which has a split seat ring with a flange at the back and a rectangular ring groove at the front, and a plurality of flexible sealing bodies with back fixed spring sheets are installed in the rectangular ring groove. The flexible sealing bodies are floatingly connected in the rectangular ring groove by using positioning screws through waist holes embedded in positioning waist holes. The flexible floating sealing ring is composed of a plurality of flexible sealing bodies, and turbine oil is introduced into the flexible sealing body in the rectangular ring groove through sponges for lubrication. The main technical features are as follows: a sponge is installed at the back center of the flexible sealing body located at the upper center of the rectangular ring groove, and the sponge In close contact with the back of the flexible sealing body, an oil supply core hole is drilled on the rectangular ring groove corresponding to the sponge position, one end of the felt oil core is passed through the oil supply core hole in the rectangular ring groove on the petal seat ring and in close contact with the sponge, the other end of the felt oil core is passed through the central oil supply core hole of the labyrinth oil supply plug with a fixed flange at the upper end, a sealing ring in the middle, a pipe thread at the upper end and an annular seam inside and exposed about 40 to 80 mm, the labyrinth oil supply plug is fixed in a sealing manner at the center position above the petal seat ring with screws through the fixed flange, so that the oil supply core hole of the labyrinth oil supply plug is concentric with the oil supply core hole on the rectangular ring groove, and the oil supply core hole on the rectangular ring groove is concentric with the upper cup ring cover and the oil filling port. The upper oil filling cup composed of a transparent cylinder and a lower screw ring cover is fixed on the labyrinth oil filling plug in a sealing manner through a pipe thread, turbine oil is injected into the upper oil filling cup through the oil filling port, and the oil filling cap is screwed on the oil filling port in a sealing manner through the pipe thread. The oil level of the turbine oil is 50-100 mm, and the upper cup ring cover, the lower screw ring cover and the transparent cylinder are all sealed; a sponge is installed at the center of the back of the flexible sealing body at the center below the rectangular ring groove, and an oil filling core hole is drilled at the center below the rectangular ring groove corresponding to the sponge. One end of the felt oil core passes through the oil filling core hole and is in close contact with the sponge, and the other end of the felt oil core passes through the fixed flange The lower thread plug has a central oil supply core hole and exposes a reserved length for immersion in turbine oil. The lower thread plug is fixed to the center position below the petal seat ring with screws through a fixing flange, so that the oil supply core hole on the lower thread plug is concentric with the oil supply core hole on the rectangular ring groove. The bottom ring cover is fixed to the lower end of the transparent cylinder in a sealing manner, and the upper threaded ring cover is fixed to the upper end of the transparent cylinder. Turbine oil is injected into the transparent cylinder through the upper threaded ring cover. The oil level height is two-thirds of the total height of the transparent cylinder. The container composed of the transparent cylinder and the bottom ring cover is fixed under the lower thread plug through the pipe thread and the upper threaded ring cover. The felt oil core is immersed in the bottom of the turbine oil, and the petal seat ring is fixed to the end cover with bolts through a flange. The diameter of the felt oil core is closely matched with the diameter of the oil supply core hole, and the width of the annular seam is 0.5 to 2 mm, so as to ensure that some turbine oil flowing down due to vibration can be stored inside as much as possible. The sponge has good elasticity and oil resistance. The turbine oil is absorbed into the sponge. The oil filling cap and the oil filling port have good sealing performance. The flexible sealing bodies are overlapped with each other, providing a channel for the central flexible sealing body to supply oil to other flexible sealing bodies.
[0004] The technical effect achieved by the technical solution provided by the present invention is achieved as follows: the flexible sealing body is made of felt, and the multi-petal flexible sealing body forms a flexible floating sealing ring. The sealing ring composed of the flexible sealing body is placed in a rectangular ring groove on the petal seat ring, and is floatingly connected in the rectangular ring groove through a waist hole sleeve and a positioning screw placed in a positioning waist hole. The spring sheet on the back of the flexible sealing body makes the inner surface of the flexible sealing body and the surface of the large shaft floatingly contact to achieve sealing. Since the flexible sealing body and the high-speed rotating large shaft surface are in contact and friction, the internal turbine oil is consumed, so the turbine oil in the upper oil replenishing cup needs to be replenished to the inside of the flexible sealing body through the felt oil core and the sponge by capillary effect. The flexible sealing bodies are overlapped with each other, so the flexible sealing bodies are transported from the flexible sealing body with high oil content to the flexible sealing body with low oil content by capillary effect. The sponge has good oil absorption and elasticity, so the sponge between the felt oil core and the flexible sealing body can replenish oil without affecting the floating property of the sealing body. The diameter of the felt oil core should be calculated according to the turbine oil temperature, tension and oil level to achieve a reasonable diameter so as to achieve a reasonable balance with gravity and serve the purpose of replenishing turbine oil to the flexible seal. The annular gap in the labyrinth oil supply plug is mainly used to store excess turbine oil flowing down due to vibration, to prevent the excess turbine oil from entering the generator because it is not needed by the flexible seal. The entire flexible seal is mainly replenished with the turbine oil required for lubrication by the upper oil supply cup using capillary effect. The amount of turbine oil lost by friction is replenished into the flexible seal. When the generator is not running, the turbine oil is stored in the felt by the adsorption force generated by the felt and the tension of the turbine oil itself and will not flow out. The container below for turbine oil has two functions; in case the amount of turbine oil added into the upper oil filling cup is too large, it will flow into the container below along the overlapping sealing ring composed of the flexible sealing body, the sponge below, the felt oil core and the oil filling core hole, so the container below also has the function of storing excess turbine oil; if the turbine oil in the lower half of the flexible sealing body is less, the turbine oil container below will add oil to the lower half of the flexible sealing body through the felt oil core and sponge under the capillary effect, so as to avoid carbonization due to high temperature generated by friction of the flexible sealing body.
[0005] The present invention perfectly solves the technical difficulty of automatic oil replenishment when the flexible seal is used on the generator end cover. The structure involved in this scheme is simple and ingenious, and fully utilizes the capillary effect, the tension of the turbine oil and the gravity to effectively control the reasonable amount of oil required by the flexible seal, that is, the flexible seal automatically replenishes the oil loss amount without generating excess oil entering the generator. Therefore, it is novel, creative and practical, and will surely be widely used in the field of steam turbine generators and other related fields. Description of the drawings:
[0006] Figure 1 .Front view of the automatic oil replenishment device for the flexible floating seal of the generator end cover
[0007] Figure 2 .Right view of the automatic oil replenishment device for the flexible floating seal of the generator end cover
[0008] Figure 3 .AA view of the automatic oil replenishment device for the flexible floating seal of the generator end cover
[0009] in:
[0010] 1. Upper cup ring cover 2. Oil filling cap 3. Pipe thread
[0011] 4. Oil filling port 5. Turbine oil 6. Transparent cylinder
[0012] 7. Felt oil core 8. Labyrinth oil supply plug 9. Upper oil supply cup
[0013] 10. Lower screw ring cover 11. Oil filling core hole 12. Sealing ring
[0014] 13. Annular seam 14. Screws 15. Fixed flange
[0015] 16. Outer ring surface 17. Rectangular ring groove 18. Sponge
[0016] 19, positioning screw 20, screw hole 21, positioning waist hole
[0017] 22. Waist hole sleeve 23. Flexible sealing body 24. Main shaft
[0018] 25. Lower thread plug 26. Upper screw ring cover 27. Bottom ring cover
[0019] 28. Inner ring surface 29. Petal seat ring 30. Bolt
[0020] 31. End cover 32. Flange 33. Spring sheet Specific implementation method:
[0021] Fix the sponges 18 at the center position of the back of the flexible sealing body 23 with the spring sheet 33 on the back, and fix another sponge 18 at the center position of the back of the flexible sealing body 23 with the spring sheet 33 on the back. Then put all the flexible sealing bodies 23 into the waist hole sleeve 22 in the positioning waist hole 21, and place the flexible sealing body 23 with the sponge 18 symmetrically at the upper center position of the rectangular ring groove 17 formed by the outer ring surface 16 and the inner ring surface 28 at the front end of the petal seat ring 29. Screw the positioning screw 19 into the waist hole sleeve 22 through the screw hole 20 on the outer ring surface 16. One end of the felt oil core 7 is passed through the petal seat ring 29 and is in close contact with the sponge 18 through the oil supply core hole 11 inside the rectangular ring groove 17. The sponge 18 is in close contact with the flexible sealing body 23. The other end of the felt oil core 7 is passed through the oil supply core hole 11 on the labyrinth oil supply plug 8 with a fixed flange 15 at the lower end, a sealing ring 12 in the middle and a plurality of annular gaps 13 inside, and is exposed by 20 to 90 mm. The labyrinth oil supply plug 8 is fixed to the petal seat ring 29 with screws 14 through the fixed flange 15. The lower screw ring cover 10 is fixed to the labyrinth oil supply plug 8 through the pipe thread 3. The upper oil supply cup 9 is composed of a transparent cylinder 6 and an upper cup ring cover 1 with an oil filling port 4. Turbine oil 5 is injected into the upper oil supply cup 9 from the oil filling port 4. The oil level of the turbine oil 5 is 50 to 100 mm. The oil filling cap 2 is tightened on the oil filling port 4.
[0022] One end of another felt oil core 7 passes through the bottom of the split seat ring 29 and is in close contact with the sponge 18 through the oil filling core hole 11 of the rectangular ring groove 17. The other end of the felt oil core 7 passes through the oil filling core hole 11 in the center of the lower screw plug 25 with the fixed flange 15 and is exposed for a section. The lower screw plug 25 is fixed to the bottom of the split seat ring 29 by screws 14 through the fixed flange 15. The upper end of the transparent cylinder 6 with the bottom ring cover 27 fixed below is fixed inside the upper screw ring cover 26. After the turbine oil 5 is injected into the transparent cylinder 6 through the upper screw ring cover 26, the upper screw ring cover 26 is fixed to the bottom of the lower screw plug 25 through the pipe thread 3. The inner diameter of the flexible sealing body 23 is in floating contact with the outer surface of the main shaft 24. The split seat ring 29 is fixed to the end cover 31 by bolts 30 through the flange 32. The implementation is completed.
Claims
1. An automatic oil replenishing device for a flexible floating sealing ring of a generator end cover, comprising a split seat ring with a flange at the rear and a rectangular ring groove at the front, a plurality of flexible sealing bodies with back-fixed spring sheets installed in the rectangular ring groove, the flexible sealing bodies are floatingly connected in the rectangular ring groove by means of positioning screws through waist holes embedded in positioning waist holes, and the flexible floating sealing ring is composed of a plurality of flexible sealing bodies, characterized in that: A sponge is installed at the center of the back of the flexible sealing body located at the center of the rectangular ring groove. The sponge is in close contact with the back of the flexible sealing body. An oil filling core hole is drilled on the rectangular ring groove corresponding to the position of the sponge. One end of the felt oil core is passed through the oil filling core hole in the rectangular ring groove on the petal seat ring and in close contact with the sponge. The other end of the felt oil core is passed through the labyrinth oil filling thread with a fixed flange at the upper end, a sealing ring in the middle, a pipe thread at the upper end and an annular gap inside to plug the central oil filling core hole and expose 40 to 80 mm The labyrinth oil supply plug is fixed in a sealed manner at the center position above the split seat ring by screws through the fixing flange, so that the oil supply core hole of the labyrinth oil supply plug is concentric with the oil supply core hole on the rectangular ring groove. The upper oil supply cup composed of the upper cup ring cover, the oil filling port, the transparent cylinder and the lower screw ring cover is fixed on the labyrinth oil supply plug in a sealed manner through the pipe thread. The turbine oil is injected into the upper oil supply cup through the oil filling port, and the oil filling cap is screwed on the oil filling port in a sealed manner through the pipe thread. The oil level of the turbine oil is 50 ~100 mm, the upper cup ring cover and the lower screw ring cover and the transparent cylinder are all sealed; a sponge is installed at the center of the back of the flexible sealing body at the center below the rectangular ring groove, and an oil replenishment core hole is drilled at the center below the rectangular ring groove corresponding to the sponge. One end of the felt oil core passes through the oil replenishment core hole and is in close contact with the sponge, and the other end of the felt oil core passes through the center oil replenishment core hole of the lower screw plug with a fixed flange and exposes the length reserved for immersion in turbine oil. The lower screw plug is fixed to the bottom of the split seat ring with screws through the fixed flange. The center position of the surface is set so that the oil supply core hole on the lower thread plug is concentric with the oil supply core hole on the rectangular ring groove. The bottom ring cover is fixed to the lower end of the transparent cylinder in a sealing manner, and the upper screw ring cover is fixed to the upper end of the transparent cylinder. The turbine oil is injected into the transparent cylinder through the upper screw ring cover. The oil level height is two-thirds of the total height of the transparent cylinder. The container composed of the transparent cylinder and the bottom ring cover is fixed under the lower thread plug through the pipe thread and the upper screw ring cover. The felt oil core is immersed in the bottom of the turbine oil, and the petal seat ring is fixed to the end cover with bolts through the flange.