Split rifle spiral line sealing device

Abstract

A split rifle spiral line 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 movable oil deflector ring (2) is in a cup shape, the open end of the movable oil deflector ring (2) faces the outer side, and the open end of the static oil deflector ring (3) faces the inner cavity of the sealing end cover (1). A rifle spiral line (5) with a tooth-shaped section surrounds the outer peripheral face of the movable oil retainer (2), a gap is reserved between the movable oil retainer (2) and the inner wall of the sealing end cover (1), an annular groove (6) is formed in the outer peripheral face of the static oil retainer (3), one end of the static oil retainer (3) is fixed to the outer side end of the sealing end cover (1), the other end of the static oil retainer (3) extends into a cavity of the movable oil retainer (2), and gaps are reserved between the static oil retainer (3) and the wall face of the movable oil retainer (2) and between the static oil retainer (3) and the rotating shaft (4). 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 an open-type sealing end cover. Background Art

[0002] Non-contact dynamic sealing is very suitable for the case of high rotating speed of the rotating shaft. The seal between the rotating shaft and the sealing end cover does not contact, and there is no mutual friction loss. The Chinese utility model patent CN214455093U discloses a "sealing device for the hollow shaft of the large tile of an open-type ball mill". The technical solution of this patent provides a dynamic sealing structure, which has a good use effect when applied to a ball mill. However, for some equipment with higher sealing 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 an open-type rifled helix sealing device with better sealing effect.

[0004] The technical solution of the utility model is: an open-type rifled helix sealing device, including 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 with it. The static oil baffle ring is arranged in the inner cavity of the sealing end cover. The dynamic oil baffle ring is cup-shaped, with its open end facing outward. A rifled helix with a toothed cross-section is wound around the outer peripheral surface of the dynamic oil baffle ring and there is a gap between it and the inner wall of the sealing end cover. A ring groove is provided on the outer peripheral surface of the static oil baffle ring. One end of the static oil baffle ring is fixed to the outer end of the sealing end cover, and the other end extends into the cavity of the dynamic oil baffle ring. There are gaps between the static oil baffle ring and the wall surfaces of the dynamic oil baffle ring and the rotating shaft.

[0005] The technical effect of the utility model is: it has the advantages of reasonable structural design and good sealing effect. The rifled helix on the dynamic oil baffle ring forms an oil baffle ring, which will continuously push the lubricating medium entering the gap inward during rotation. The lubricating medium will flow back into the internal oil pool again under the interception of multiple ring grooves formed by the rifled helix, which can well avoid the occurrence of lubricating medium overflow. There are gaps between the components of the sealing device, and there is no friction phenomenon and no mechanical friction loss. The open-type rifled helix mechanical sealing device can be applied to the treatment of oil leakage of other rotating machine shaft seals, such as the shaft seal transformation of rotating machine equipment in power plants, rotating machine equipment in mines and rotating machine equipment in petrochemical industries. Brief Description of the Drawings

[0006] Figure 1 It is a schematic cross-sectional structure diagram of the utility model. Detailed Description

[0007] Such as Figure 1As shown, a split-type Rifle spiral sealing device comprises a sealing end cover 1, a dynamic oil baffle ring 2 and a static oil baffle ring 3. The dynamic oil baffle ring 2 is fixed on a rotating shaft 4 and rotates therewith, and the static oil baffle ring 3 is arranged in the inner cavity of the sealing end cover 1. The dynamic oil baffle ring 2 is cup-shaped, and the rotating shaft and the dynamic oil baffle ring are coaxially arranged and pass through the bottom of the cup, and its open end faces outward. The outer peripheral surface of the dynamic oil baffle ring 2 is surrounded by a Rifle spiral 5 with a toothed cross-section and a gap is left with the inner wall of the sealing end cover 1. The outer peripheral surface of the static oil baffle ring 3 is provided with an annular groove 6, and the annular groove can be multiple. One end of the static oil baffle ring 3 is fixed to the outer end of the sealing end cover 1, and the other end extends into the cavity of the dynamic oil baffle ring 2. There are gaps between the static oil baffle ring 3 and the wall surface of the dynamic oil baffle ring 2 and the rotating shaft 4.

[0008] The side wall of the dynamic oil retaining ring 2 is provided with an oil return hole communicating with the inside and outside. The lubricating medium can flow back along the oil return hole and the edge of the dynamic oil retaining ring.

[0009] The dynamic oil retaining ring 2 is fixed to the rotating shaft by bolts.

[0010] The static oil retainer ring 3 is provided with an oil return hole at the bottom thereof, which passes through the inner and outer walls of the static oil retainer ring 3. The lubricating medium entering between the rotating shaft and the static oil retainer ring flows back through the oil return hole.

[0011] The sealing end cover 1 is provided with a tongue and groove, and the end of the static oil retaining ring 3 is provided with a flange, and the static oil retaining ring 3 is connected to the sealing end cover 1 through the tongue and groove and fixed by bolts. The static oil retaining ring is easy to disassemble and maintain.

[0012] A sealing ring 7 is provided between the static oil retaining ring 3 and the rotating shaft 4. The sealing ring is of skeleton type, which can prevent the lubricating medium from flowing out along the surface of the part by wetting. The sealing ring can be replaced at any time by disassembling the static oil retaining ring. The skeleton sealing ring on the inner circle of the static oil retaining ring will have a solid lubricating medium resistant to high temperature of 360°C in the inner cavity. The skeleton sealing ring can prevent external dust from entering the interior of the sealing device.

[0013] The parts of the split-type rifle spiral mechanical seal device are split in half. After the parts are assembled, they are fixed with screws through the ear plates on the sealing end cover. Driven by the rotation of the bearing and the shaft, the lubricating medium inside the bearing box overflows to the outside of the end cover along the axial direction. After the overflowed lubricating medium encounters the rifle spiral, it is forced back into the bearing box by the reverse rifle spiral under the action of the rifle spiral and the inner wall of the sealing end cover. A small amount of lubricating medium enters the static oil ring. Under the action of the static oil ring groove, the lubricating medium flows downward from the high position on the surface of the static oil ring and falls into the cavity of the dynamic oil ring. Under the action of the high-speed rotation of the dynamic oil ring, the lubricating medium at this place will be thrown out from the oil throwing hole and the edge of the mouth. The last part of the lubricating medium will be blocked by the skeleton seal ring and flow back through the oil return hole in the lower half of the static oil ring.

Claims

1. An opposed-opening rifled spiral seal device, comprising a sealing end cover (1), a moving oil baffle ring (2) and a static oil baffle ring (3). The moving oil baffle ring (2) is fixed on a rotating shaft (4) and rotates therewith. The static oil baffle ring (3) is arranged in the inner cavity of the sealing end cover (1), and is characterized in that, The movable oil ring (2) is cup-shaped with its open end facing outward. The outer peripheral surface of the movable oil ring (2) is surrounded by a rifled helix (5) with a toothed cross-section and has a gap with the inner wall of the sealing end cover (1). The outer peripheral surface of the static oil ring (3) is provided with an annular groove (6). One end of the static oil ring (3) is fixed to the outer end of the sealing end cover (1), and the other end extends into the cavity of the movable oil ring (2). There are gaps between the static oil ring (3), the wall surface of the movable oil ring (2), and the rotating shaft (4).

2. The split rifled spiral seal device according to claim 1, characterized in that, The side wall of the movable oil ring (2) is provided with an oil return hole communicating the inside and the outside.

3. The split rifled spiral seal device according to claim 1 or 2, characterized in that, The movable oil ring (2) is fixed to the rotating shaft by bolts.

4. The split rifled helix sealing device according to claim 1, characterized in that, The static oil ring (3) is provided with an oil return hole penetrating the inner and outer walls of the static oil ring (3) at the bottom position.

5. The split rifled spiral seal device according to claim 1, characterized in that, The sealing end cover (1) is provided with a rabbet, and the end of the static oil ring (3) is provided with a flange. The static oil ring (3) is connected to the sealing end cover (1) through the rabbet and fixed by bolts.

6. The split rifled spiral seal device according to claim 1 or 4, characterized in that, A sealing ring (7) is provided between the static oil ring (3) and the rotating shaft (4).

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