Split comb tooth type damping sealing device

Abstract

A split comb tooth type damping sealing device comprises a sealing end cover (1), a movable oil deflector ring (2) and a static oil deflector ring (3), the movable oil deflector ring (2) is fixed to a rotating shaft (4) and rotates along with the rotating shaft (4), the static oil deflector ring (3) is arranged in an inner cavity of the sealing end cover (1), the sealing end cover (1) is provided with an oil backflow channel, the movable oil deflector ring (2) is provided with a plurality of annular grooves around the circumferential face of the movable oil deflector ring (2), and the static oil deflector ring (3) is arranged in the inner cavity of the sealing end cover (1). The positions and the number of the static oil retaining rings (3) are matched with those of the movable oil retaining rings (2), the peripheries of the static oil retaining rings (3) are connected with the inner wall of the sealing end cover (1), the inner peripheries of the static oil retaining rings (3) extend into annular grooves of the movable oil retaining rings (2), gaps are reserved between the inner peripheries of the static oil retaining rings (3) and the grooves, and oil return holes are formed in the positions, located at the bottoms, of the static oil retaining rings (3). The sealing device has the advantages of reasonable structural design and good sealing effect.

Description

Technical Field

[0001] The utility model relates to a sealing device, in particular to a dynamic sealing device applied to a split-type sealing end cover. Background Art

[0002] The non-contact dynamic seal is very suitable for the case of high rotation speed of the rotating shaft. The seal between the rotating shaft and the sealing end cover does not contact each other, and there is no mutual friction loss. The Chinese utility model patent CN214455093U discloses a "split-type ball mill large-tile hollow shaft sealing device". The patented technical solution provides a dynamic sealing structure, which has good use effect when applied to the ball mill. However, for some equipment with higher sealing effect requirements, this sealing structure is difficult to meet the requirements. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a comb-tooth type dynamic sealing device with better sealing effect.

[0004] The technical solution of the utility model is: a split comb-tooth damping sealing device, comprising a sealing end cover, a dynamic oil baffle ring and a static oil baffle ring, the dynamic oil baffle ring is fixed on the rotating shaft and rotates therewith, the static oil baffle ring is arranged in the inner cavity of the sealing end cover, the sealing end cover is provided with a channel for oil reflux, the dynamic oil baffle ring is provided with a plurality of annular grooves around its circumference, the position and number of the static oil baffle ring are adapted to the dynamic oil baffle ring, the outer periphery of the static oil baffle ring is connected with the inner wall of the sealing end cover, the inner periphery extends into the annular groove of the dynamic oil baffle ring and a gap is left between the grooves, and the static oil baffle ring is provided with an oil return hole at the bottom.

[0005] The technical effect of the utility model is: it has the advantages of reasonable structural design and good sealing effect. The lubricating medium flows back to the internal oil pool under the interception of multiple tooth rings and ring grooves, which can well avoid the overflow of the lubricating medium. Since there are gaps between the various components of the whole sealing device, there is no friction between the various components, so there is no mechanical friction loss between the dynamic seal and the static seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a cross-sectional structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0007] like Figure 1As shown, a split comb-tooth damping seal device comprises a sealing end cover 1, a dynamic oil retaining ring 2 and a static oil retaining ring 3. The dynamic oil retaining ring 2 is fixed on a rotating shaft 4 and rotates with it. The static oil retaining ring 3 is arranged in the inner cavity of the sealing end cover 1. The sealing end cover 1 is provided with a channel for oil reflux. The dynamic oil retaining ring 2 is provided with a plurality of annular grooves around its circumference. The static oil retaining ring 3 is adapted to the position and quantity of the dynamic oil retaining ring 2. The static oil retaining ring 3 is arranged in a comb-tooth shape. The outer periphery of the static oil retaining ring 3 is connected to the inner wall of the sealing end cover 1, and the inner periphery extends into the annular groove of the dynamic oil retaining ring 2 and a gap is left between the grooves. The static oil retaining ring 3 is provided with an oil return hole at the bottom corresponding to the bottom of the inner cavity of the sealing end cover. The oil return hole runs through the two end faces of the static oil retaining ring. A gap is left between the dynamic seal and the static seal to avoid direct contact. After the oil enters the gap between the dynamic seal and the static seal, it will automatically fill the gap and form a damping effect during rotation.

[0008] The inner wall of the sealing end cover 1 is provided with an annular embedding groove, and the static oil retaining ring 3 is embedded in the embedding groove.

[0009] The inner side of the sealing end cover 1 is provided with an oil baffle 5, which is clearance-matched with the rotating shaft 4, and an oil return hole is provided at the bottom of the oil baffle 5. The oil baffle can effectively block the splashing oil from entering.

[0010] The oil baffle 5 is connected to the sealing end cover 1 by bolts. The oil baffle and the sealing end cover can be in an integrated or split structure.

[0011] The oil baffle 5 is made of polytetrafluoroethylene.

[0012] The static oil retaining ring 3 is made of polytetrafluoroethylene.

[0013] The dynamic oil retaining ring is fixed to the rotating shaft with bolts on both sides. The components of the whole set of split comb-tooth damping mechanical seal are split in half. After the components are assembled, they are fixed with screws through the ear plate on the end cover. After the machine is started, the lubricating medium inside the bearing box will overflow to the outside of the end cover along the axial direction under the rotation of the bearing and the rotating shaft. After encountering the first polytetrafluoroethylene oil retaining plate, most of them are blocked and fall directly and automatically flow back to the inside of the bearing box. A small part of the lubricating medium enters the sealing cavity through the gap between the polytetrafluoroethylene oil retaining plate and the rotating shaft. After encountering the comb-tooth dynamic oil retaining ring, it is thrown into the sealing cavity by the first-level dynamic oil retaining ring. The lubricating medium automatically flows back to the inside of the bearing box through the oil return hole at the bottom of the polytetrafluoroethylene oil retaining plate. There is also a very small part of the lubricating medium that continues to go deeper and encounters the next comb-tooth dynamic oil retaining ring. The cooperation between the dynamic oil retaining ring and the static oil retaining ring has a very good sealing effect.

Claims

1. A split comb-tooth damping seal device, comprising a sealing end cover (1), a dynamic oil retaining ring (2) and a static oil retaining ring (3), wherein the dynamic oil retaining ring (2) is fixed on a rotating shaft (4) and rotates therewith, and the static oil retaining ring (3) is arranged in the inner cavity of the sealing end cover (1), and a channel for oil reflux is provided on the sealing end cover (1), characterized in that: The dynamic oil baffle ring (2) is provided with a plurality of annular grooves around its circumference. The position and number of the static oil baffle ring (3) are adapted to those of the dynamic oil baffle ring (2). The outer circumference of the static oil baffle ring (3) is connected to the inner wall of the sealing end cover (1), while the inner circumference extends into the annular groove of the dynamic oil baffle ring (2) with a gap between the grooves. The static oil baffle ring (3) is provided with an oil return hole at the bottom.

2. The split comb-tooth damping seal device according to claim 1, characterized in that: The inner wall of the sealing end cover (1) is provided with an annular embedding groove, and the static oil retaining ring (3) is embedded in the embedding groove.

3. The split comb-tooth damping seal device according to claim 1, characterized in that: An oil baffle (5) is provided at the inner end of the sealing end cover (1), the oil baffle (5) and the rotating shaft (4) are clearance-matched, and an oil return hole is provided at the bottom of the oil baffle (5).

4. The split comb-tooth damping seal device according to claim 3, characterized in that: The oil baffle (5) is connected to the sealing end cover (1) via bolts.

5. The split comb-tooth damping seal device according to claim 3, characterized in that: The oil baffle (5) is made of polytetrafluoroethylene.

6. The split comb-tooth damping seal device according to any one of claims 1 to 5, characterized in that: The static oil retaining ring (3) is made of polytetrafluoroethylene.

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