Dual magnetic preloaded double tenon seal lap bearing oil mist flexible sealing device

Abstract

The invention discloses a double magnetic force pre-tightening double tenon seal overlap bearing oil mist flexible sealing device, wherein the magnetic force adjusting bolts of the adjustable magnetic column are fixed on the upper and lower petal seat rings with flange holes, fixing screw holes and oil replenishing holes, and the magnetic poles of the radial magnetic column are repelled to generate radial pre-tightening force. A felt seal body with a felt upper tenon at one end and a felt lower tenon at the other end is fixed on the oil mist side of the carbon arc plate bearing, and a tangential magnetic column is embedded in the felt upper tenon and the lower end, and a tangential magnetic column is embedded in the felt lower tenon and the upper end, and the magnetic poles of the tangential magnetic columns at both ends attract each other to generate tangential pre-tightening force, and a felt tenon is fixed at one end of the felt lower tenon to form two tenon connection modes, and the carbon arc plate fixed with the felt seal body and the anti-rotation hole is placed in a rectangular ring groove, and the carbon arc plate and the felt tenon are installed on the air side. The arc-shaped pressure plate is fixed on the upper and lower petal seat rings, and the anti-rotation bolt is screwed into the anti-rotation hole through the arc-shaped pressure plate. This solution will be widely used in power generation and related fields.

Description

Technical field:

[0001] The invention relates to an oil mist flexible sealing device for the end of a generator bearing. Background technology:

[0002] At present, the oil mist seal at the end of the bearing on the generator or large equipment basically adopts the comb teeth and hard packing sealing method. The comb teeth seal is gradually eliminated due to poor sealing effect and many layers. As for the hard packing seal, there are also technical defects. This structure uses an oil-resistant rubber strip or sponge strip to be inserted into a single mortise shrinking sliding gap groove at the overlap to intercept the oil mist generated by the turbine oil in the bearing from overflowing to the air side. Not only does the rubber strip and sponge strip lose their elasticity due to long-term thermal aging, but more importantly, when the rubber strip and sponge strip age and harden, the entire sealing ring cannot shrink to compensate for the wear of the inner diameter, resulting in oil mist overflowing outward. It is difficult for the hard-filled seal to have the same contact curvature with the main shaft surface, and the conformability is relatively poor, resulting in oil mist overflowing outward. Therefore, the field now urgently needs a flexible follow-up oil mist seal device that can freely shrink at the mortise joint to compensate for the wear, has good conformal contact between the seal body and the main shaft surface, and can also overcome the self-weight of the sealing device when it is used vertically to prevent eccentric wear. Summary of the invention:

[0003] The present invention provides a technical solution that has good sealing and sliding properties at the overlap of the sealing body, and not only eliminates the rubber strips and sponge strips in the prior art, but also improves the conformability of the seal between the inner diameter of the sealing body and the main shaft surface, and eliminates the eccentric wear of the sealing body caused by its own weight. Its main technical features are: a magnetic adjustment bolt with an N-pole centripetal adjustable magnetic column fixed at the front end is screwed into a plurality of magnetic adjustment screw holes on the upper petal seat ring and the lower petal seat ring with oil replenishment holes, flange holes, and engagement screw holes; a plurality of groups of radial magnetic columns and S-pole centripetal symmetrically embedded into the outer diameter surface of the carbon arc plate with anti-rotation holes and fixing screw holes; a felt seal body with a felt upper tenon at one end and embedded with a tangential magnetic column and a felt lower tenon at the other end and embedded with a tangential magnetic column is concentrically fixed to the carbon arc with fixing screws through the fixing screw holes. On the side of the plate, the S pole of the tangential magnetic column embedded in the upper tenon of the felt corresponds to the N pole of the tangential magnetic column embedded under the end of another felt seal body, and the N pole of the tangential magnetic column embedded in the lower tenon of the felt corresponds to the S pole of the tangential magnetic column embedded above the end of another felt seal body. The inner diameter of the felt seal is 2 to 5 mm smaller than the inner diameter of the carbon arc plate on one side. The felt tenon is fixed with a connecting bolt at the end with the lower tenon of the felt. The inner diameter of the felt tenon is the same as the inner diameter of the lower tenon of the felt and the felt seal body. The felt tenon is installed on the air side. The felt tenon must block the gap formed by the felt upper tenon, the felt lower tenon and the end face of the felt seal, and the side of the felt tenon is in good contact with the side of the felt upper tenon and the felt lower tenon; the assembly consisting of the carbon arc plate, the felt seal, the radial magnetic column and the tangential magnetic column is placed in the rectangular ring groove, and the N pole of the radial magnetic column is symmetrical with the N pole of the adjustable magnetic column, the felt upper tenon at the end of the felt seal and the felt lower tenon of another felt seal have a good overlap and can slide freely, and the felt upper tenon of the felt seal There is a gap between the end face corresponding to the felt seal body and the felt lower tenon of the felt seal body and the corresponding end face of the felt seal body. The felt seal body, the felt upper tenon and the felt lower tenon are installed on the oil mist side of the bearing. The felt tenon and the end of the carbon arc plate have a gap and are installed on the air side. The arc-shaped pressure plate with anti-rotation screw holes is fixed on the upper and lower seat rings by the screw holes with the screw holes. The anti-rotation bolts are screwed into the anti-rotation holes through the anti-rotation screw holes, and the device is fixed to the end of the bearing by the screw holes through the flange holes. The tangential magnetic columns embedded in the felt upper tenon, the felt lower tenon and the end face of each felt seal body are all corresponding to the S pole and the N pole, forming a tangential magnetic pre-tightening so that the inner diameter surface of the entire sealing ring composed of the flexible felt seal body is in good contact with the outer diameter surface of the main shaft. The anti-rotation hole and anti-rotation bolt prevent the entire sealing ring from rotating together with the main shaft. The double-track tenon structure composed of the felt tenon, the felt upper tenon and the felt lower tenon makes the felt seal body better in the overlap, and can shrink freely to compensate for wear and follow the main shaft runout.The side of the felt seal body has good sealing contact with the rectangular ring groove surface on the oil mist side of the bearing. Multiple oil replenishing holes are used to replenish the turbine oil for the felt seal body, which plays a role in lubrication, sealing and protection during the sealing process, so that the sealing ring composed of the felt seal body has a longer service life and better sealing performance.

[0004] The technical effect achieved by the technical solution provided by the present invention is achieved as follows: after the device is assembled and fixed vertically at both ends of the bearing, first adjust the magnetic force adjusting bolts on the upper and lower seat rings so that the deadweight of the entire sealing body is offset by the repulsive magnetic force generated by the radial magnetic column of the lower seat ring and the N pole of the adjustable magnetic column and the N pole of the radial magnetic column, thereby eliminating the phenomenon of eccentric wear of the sealing ring caused by deadweight and causing oil mist to overflow, that is, the magnetic force adjusting bolt on the lower seat ring is screwed in a greater distance, and the magnetic force adjusting bolt on the upper seat ring is screwed in a less distance, but a radial pre-tightening magnetic force should also be formed for the entire sealing ring, and then the arc-shaped pressure plate is fixed, and the sealing ring composed of the entire felt sealing body must float freely in the rectangular ring groove and the side surface is in good contact with the side wall of the rectangular ring groove, and no oil mist should overflow here. The anti-rotation hole and the anti-rotation bolt are not stuck, and there should be no phenomenon that hinders the sealing ring from compensating the loss of shrinkage and following the spindle runout. When the generator or large equipment is started, the turbine oil in the bearing will produce expanded oil mist during lubrication and cooling. A small part of this oil mist will replenish the turbine oil required by the felt seal through the multiple oil supply holes on the sides of the upper and lower seat rings, making its service life longer, the sealing effect better, and the conformability better, that is, there is no gap between the inner diameter surface of the felt seal and the outer surface of the main shaft. The turbine oil in the bearing continuously provides the turbine oil required by the felt seal through the oil supply holes in the form of oil mist for lubrication and sealing, avoiding dry grinding between it and the main shaft surface and causing the main shaft to heat up; most of the expanded oil mist in the bearing is sealed inside the bearing cavity by the flexible sealing ring composed of the felt seal, blocking the oil mist from overflowing to the air side and polluting the equipment. In addition to the repulsive magnetic force between the radial magnetic column and the adjustable magnetic column to overcome the self-weight and radial preload of the flexible sealing ring, this solution also forms a tangential preload by generating the attractive magnetic force of the tangential magnetic columns corresponding to the S poles and N poles embedded in the felt upper tenon, the lower end face of the felt seal body, the felt lower tenon and the upper end face of the felt seal body, so that the flexible sealing ring composed of the felt seal body has a better sealing effect. Since this solution adopts the felt upper tenon, the felt lower tenon and the felt tenon double tenon connection sealing structure, it completely solves a series of problems existing in the prior art such as oil leakage at the overlap, the inability to shrink the diameter to compensate for the wear due to the aging of the rubber strip or sponge strip, and the poor conformability. When the device is horizontally installed on the bearing, the radial preload can be adjusted to be the same, that is, the distance between the adjustable magnetic column and the radial magnetic column is the same. No matter how the device is installed, the oil filling hole and the felt upper tenon and the felt lower tenon of the felt seal body must be on the oil mist side of the bearing, which has a good sealing and lubricating protection effect on the felt seal body and keeps the felt seal body in the best sealing state at all times.

[0005] The invention has a simple structure, ingenious design and perfect technical effect. Compared with the prior art, it has novelty, creativity and practicality and will be widely used in the field of power generation and other related fields. Description of the drawings:

[0006] Figure 1 . Front view of the oil mist flexible seal device for double magnetic preloaded double tenon seal lap bearing

[0007] Figure 2 .Dual magnetic preloaded double tenon seal lap bearing oil mist flexible seal device AA view

[0008] Figure 3 .Double magnetic preload double tenon seal lap bearing oil mist flexible seal device BB view

[0009] Figure 4 .Dual magnetic preloaded double tenon seal lap bearing oil mist flexible seal device CC view

[0010] Figure 5 .Double magnetic preload double tenon seal lap bearing oil mist flexible seal device I enlarged view

[0011] Figure 6 .Double magnetic preload double tenon seal lap bearing oil mist flexible seal device DD view

[0012] in:

[0013] 1. Upper seat ring 2. Flange hole 3. Felt tenon

[0014] 4. Magnetic force adjustment bolt 5. Adjustable magnetic column 6. Radial magnetic column

[0015] 7. Rectangular ring groove 8. Tangential magnetic column 9. Tenon on felt

[0016] 10. Clearance 11. Felt lower tenon 12. Carbon arc plate

[0017] 13. Anti-rotation hole 14. Handle screw hole 15. Fixing screw hole

[0018] 16. Fixing screw 17. Lower seat ring 18. Connecting bolt

[0019] 19. Main shaft 20. Magnetic adjustment screw hole 21. Clamp bolt

[0020] 22. Arc-shaped pressure plate 23. Anti-rotation bolt 24. Air side

[0021] 25. Felt seal 26. Oil filling hole 27. Bearing oil mist side

[0022] 28. Anti-rotation screw hole Specific implementation method:

[0023] The N pole of the adjustable magnetic column 5 is fixed centripetally at the front end of the magnetic force adjusting bolt 4, and the magnetic force adjusting bolt 4 is screwed into the rectangular ring groove 7 formed by the upper petal seat ring 1 and the lower petal seat ring 17 through the magnetic force adjusting screw hole 20. The upper petal seat ring 1 and the lower petal seat ring 17 are provided with flange holes 2, screw holes 14 and oil filling holes 26. The end and lower end of the felt upper tenon 9 at one end of the felt seal 25 are respectively embedded in the tangential magnetic column 8, and the S pole corresponds to the N pole of the tangential magnetic column 8 embedded in the felt lower tenon 11 and the upper end of the other felt seal 25. The end and upper end of the felt lower tenon 11 at the other end of the felt seal 25 are respectively embedded in the tangential magnetic column 8, and the N pole is paired with the S pole of the tangential magnetic column 8 embedded in the felt upper tenon 9 and the lower end of the other felt seal 25, and the opposite poles attract each other to generate tangential preload. The oil filling hole 26 is on the oil mist side 27 of the upper seat ring 1 and the lower seat ring 17. The felt seal 25 is fixed to the side of the carbon arc plate 12 with the anti-rotation hole 13 by the fixing screw 16 through the fixing screw hole 15. The felt seal 25 is on the oil mist side 27 of the bearing, and the carbon arc plate 12 is on the air side 24. The felt tenon 3 is fixed to the end of the felt seal 25 with the felt lower tenon 11 by the connecting bolt 18. The felt tenon 3 is on the air side 24. The felt tenon 3 has the same inner diameter as the felt lower tenon 11. The felt tenon 3 must block the gap 10 formed between the felt upper tenon 9 and the felt lower tenon 11. Place a plurality of carbon arc plates 12 with felt seals 25 into the rectangular annular groove 7, and the N poles of the adjustable magnetic column 5 and the N poles of the radial magnetic column 6 are correspondingly repelled, and the poles S corresponding to a pair of tangential magnetic columns 8 are symmetrically attracted to the N poles of another pair of corresponding tangential magnetic columns 8, and the arc-shaped pressure plate 22 is respectively fixed to the upper petal seat ring 1 and the lower petal seat ring 17 through the combination screw holes 14 with the combination bolts 21, and the anti-rotation bolts 23 are screwed into the anti-rotation holes 13 through the anti-rotation screw holes 28 on the arc-shaped pressure plate 22, and the device is fixed to the bearing end face with the combination bolts 21 through the flange holes 2. The implementation is completed.

Claims

1. A double magnetic preloaded double tenon seal lap bearing oil mist flexible sealing device, characterized in that: Screw in the magnetic force adjusting bolts with N-pole centripetal adjustable magnetic columns fixed at the front end into the multiple magnetic adjusting screw holes on the upper and lower petal seat rings with oil filling holes, flange holes, and screw holes; symmetrically embed multiple groups of radial magnetic columns and S-pole centripetal adjustable magnetic columns into the outer diameter surface of the carbon arc plate with anti-rotation holes and fixing screw holes; fix the felt seal body with a felt upper tenon at one end and embedded in the tangential magnetic column and a felt lower tenon at the other end and embedded in the tangential magnetic column concentrically to the side of the carbon arc plate with fixing screws through the fixing screw holes, and embed the felt. The S pole of the tangential magnetic column in the felt upper tenon corresponds to the N pole of the tangential magnetic column embedded under the end of another felt seal body, and the N pole of the tangential magnetic column embedded in the felt lower tenon corresponds to the S pole of the tangential magnetic column embedded above the end of another felt seal body. The inner diameter of the felt seal is 2 to 5 mm smaller than the inner diameter of the carbon arc plate on one side. The felt tenon is fixed with a connecting bolt at the end with the felt lower tenon. The inner diameter of the felt tenon is the same as the inner diameter of the felt lower tenon and the felt seal body. The felt tenon is installed on the air side. At the same time, the felt tenon must be The gap formed by the felt upper tenon, the felt lower tenon and the end face of the felt seal must be blocked, and the side of the felt tenon is in good contact with the side of the felt upper tenon and the felt lower tenon; the assembly consisting of the carbon arc plate, the felt seal, the radial magnetic column and the tangential magnetic column is placed in the rectangular ring groove, and the N pole of the radial magnetic column is symmetrical with the N pole of the adjustable magnetic column, the felt upper tenon at the end of the felt seal and the felt lower tenon of another felt seal have a good overlap and can slide freely, the felt upper tenon of the felt seal and the felt There is a gap between the corresponding end face of the sealing body and the felt lower tenon of the felt sealing body and the corresponding end face of the felt sealing body. The felt sealing body, the felt upper tenon and the felt lower tenon are installed on the oil mist side of the bearing. There is a gap between the felt tenon and the end of the carbon arc plate and is installed on the air side. The arc-shaped pressure plate with anti-rotation screw holes is fixed to the upper and lower petal seat rings by using the screw holes. The anti-rotation bolt is screwed into the anti-rotation hole through the anti-rotation screw hole, and the device is fixed to the end of the bearing with the screw bolt through the flange hole.

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