Vertical bearing bush split type mechanical sealing device

Abstract

A vertical bearing bush split type mechanical sealing device relates to the technical field of mechanical sealing and comprises a sealing end cover (1), a static oil retainer (2) and a movable oil retainer (3), the sealing end cover (1) is provided with an oil retainer containing cavity (4) with an upper opening, a shaft hole is formed in the closed end below the sealing end cover (1), an oil return pipe (5) is arranged at the closed end, one end of the oil return pipe (5) is communicated with the oil retainer containing cavity (4), and the other end of the oil return pipe (5) is communicated with the static oil retainer (2). The static oil deflector ring (2) and the movable oil deflector ring (3) are cylindrical bodies, one end of the static oil deflector ring (2) is fixedly connected to a shaft hole of the sealing end cover (1), the other end of the static oil deflector ring (2) extends upwards, a shaft hole is formed in the upper end of the movable oil deflector ring (3), a containing cavity used for containing the static oil deflector ring (2) is formed in the lower end of the movable oil deflector ring (3), and the upper end of the static oil deflector ring (2) extends into the containing cavity of the movable oil deflector ring (3). The sealing device has the advantages of simple structure, reasonable design, reliable operation and good sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, and particularly relates to a split-type mechanical seal device for a vertical shaft bearing. Background Art

[0002] In mechanical equipment, for equipment with a vertical rotating shaft, there is a common problem of oil leakage at the shaft seal of the lower shaft bearing. The currently used sealing structures can indeed achieve a good sealing effect in the initial stage of equipment operation. However, in the actual use process, these structures still have some deficiencies. For example, polytetrafluoroethylene dynamic and static sealing rings or silicon carbide dynamic and static sealing rings are used at the shaft seal. After the rotating machine runs for a long time, due to dust erosion and the pressure difference inside and outside the shaft bearing box, and the lubricating oil directly soaking at the shaft seal, whether the equipment is running or stopped, the lubricating oil will gradually leak out from the lower shaft seal. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a split-type mechanical seal device for a vertical shaft bearing to solve the problem of oil leakage of the lower shaft oil seal of the existing vertical rotating equipment.

[0004] The technical solution of the utility model is: a split-type mechanical seal device for a vertical shaft bearing, including a sealing end cover, a static oil baffle ring, and a dynamic oil baffle ring. The sealing end cover is provided with an oil baffle ring accommodating cavity with an upward opening. The closed end below the sealing end cover is provided with a shaft hole, and a return oil pipe is provided at the closed end. One end of the return oil pipe is communicated with the oil baffle ring accommodating cavity, and the other end extends out of the sealing end cover. Both the static oil baffle ring and the dynamic oil baffle ring are cylindrical bodies. One end of the static oil baffle ring is fixedly connected to the shaft hole of the sealing end cover, and the other end extends upward. The upper end of the dynamic oil baffle ring is provided with a shaft hole and is fixed on the rotating shaft, and the lower end is provided with a cavity for accommodating the static oil baffle ring. The upper end of the static oil baffle ring extends into the cavity of the dynamic oil baffle ring.

[0005] The technical effect of the utility model is: it has the advantages of simple structure, reasonable design, reliable operation, and good sealing effect. When the vertical rotating equipment is running, a very reliable sealing effect can be achieved through the structure form of the mutual insertion and cooperation of the dynamic and static rings. The lubricating oil leaking from the lower shaft seal of the vertical rotating equipment is guided back to the oil tank through a special return channel, forming a recycling process to prevent external leakage and pollution. Brief Description of the Drawings

[0006] Figure 1 is a schematic structural view of the utility model;

[0007] Figure 2 is Figure 1 the A-A view of

[0008] Figure 3 is Figure 1 the B-B view of Detailed implementation mode

[0009] As Figure 1 、 2 shown in Figures 2 and 3, the vertical split-type mechanical seal device for a shaft bearing includes a seal end cover 1, a static oil baffle ring 2, and a dynamic oil baffle ring 3. The seal end cover, the static oil baffle ring, and the dynamic oil baffle ring are all surrounded by two half pieces. The static oil baffle ring is connected to the seal end cover, and the dynamic oil baffle ring is connected to the rotating shaft and rotates with it. The seal end cover 1 is provided with an oil baffle ring receiving cavity 4 with an upward opening. The closed end below the seal end cover 1 is provided with a shaft hole for placing the rotating shaft, and the closed end is provided with a plurality of oil return pipes 5. One end of the oil return pipe 5 communicates with the oil baffle ring receiving cavity 4, and the other end extends out of the seal end cover 1 and is connected to a recovery device through a return pipeline. The static oil baffle ring 2 and the dynamic oil baffle ring 3 are both cylindrical bodies sleeved on the rotating shaft. One end of the static oil baffle ring 2 is fixedly connected to the shaft hole of the seal end cover 1, and the other end extends upward. The static oil baffle ring is in clearance fit with the rotating shaft. The upper end of the dynamic oil baffle ring 3 is provided with a shaft hole and is fixed to the rotating shaft at the shaft hole, and the lower end is provided with a receiving cavity for accommodating the static oil baffle ring 2. The upper end of the static oil baffle ring 2 extends into the receiving cavity of the dynamic oil baffle ring 3. During the operation of the equipment, the lubricating oil will enter the annular space between the static oil baffle ring and the end cover, and is re-injected into the lubricating oil tank through the oil return pipe and the oil pumping device.

[0010] A seal ring groove is provided near the lower end of the inner cavity of the static oil baffle ring 2, and a sealing ring 6 is placed therein.

[0011] The sealing ring 6 is a skeleton sealing ring.

[0012] A plurality of circles of oil baffle ring grooves 7 are provided on the outer periphery of the part where the upper end of the static oil baffle ring 2 extends into the receiving cavity of the dynamic oil baffle ring 3. The static oil baffle ring is in clearance fit with the inner wall of the dynamic oil baffle ring.

[0013] The oil baffle ring groove 7 is provided with a downward inclined surface, so that the cross section of the oil baffle ring groove is arranged in a serrated shape together, which is convenient for the oil liquid to slide down.

[0014] The seal end cover 1 is provided with a ring groove at the shaft hole below. The static oil baffle ring 2 is fixed at the shaft hole of the seal end cover 1 by matching a circumferential convex rib provided on its outer periphery with the ring groove.

[0015] The lower end of the dynamic oil baffle ring 3 is provided with an outwardly extending eaves 8 along the edge, which is convenient for the dynamic oil baffle ring to throw off the oil liquid attached to it when rotating.

[0016] The two half pieces of the dynamic oil baffle ring 3 are clamped together through the cooperation of a tenon and a groove, and are fixedly connected by bolts. The tenon and the groove can play a positioning role, and the dynamic oil baffle ring is fastened by bolts and tightly buckled on the rotating shaft.

[0017] The seal end cover 1 is clamped together through the cooperation of a tenon and a groove and is fixedly connected by bolts. The bolts are connected through bolt holes provided on the ear plates.

[0018] When the equipment is running, the lubricating oil leaking from the shaft seal of the lower bearing bush of the equipment is blocked by the static oil baffle ring, and is thrown onto the inner wall of the sealing end cover along the outer wall of the dynamic oil baffle ring or directly flows to the bottom of the sealing end cover along the outer wall of the dynamic oil baffle ring, and then flows back to the lubricating oil tank through the oil return pipe at the bottom of the end cover, and is pumped into the bearing bush body of the rotating equipment through the oil pump to form a closed cycle. Since the static oil baffle ring is inserted into the dynamic oil baffle ring to a certain depth, the lubricating oil leaking into the end cover will flow out to the lubricating oil tank through the oil return pipe in time and will not flow out from the gap between the dynamic and static oil baffle rings, thus solving the problem of oil leakage from the oil seal of the lower bearing bush of the vertical rotating equipment. When installing, an appropriate amount of solid lubricating medium is added inside the skeleton seal ring, which can play a lubricating role and also prevent external dust from entering the inside of the sealing device.

Claims

1. Vertical split type mechanical seal device for journal bearing, comprising a seal end cover (1), a static oil baffle ring (2) and a dynamic oil baffle ring (3), characterized in that, The sealed end cover (1) is provided with an oil baffle ring accommodating cavity (4) with an upward opening. The closed end below the sealed end cover (1) is provided with a shaft hole, and a return oil pipe (5) is provided at the closed end. One end of the return oil pipe (5) communicates with the oil baffle ring accommodating cavity (4), and the other end extends out of the sealed end cover (1). Both the static oil baffle ring (2) and the dynamic oil baffle ring (3) are cylindrical bodies. One end of the static oil baffle ring (2) is fixedly connected to the shaft hole of the sealed end cover (1), and the other end extends upward. The upper end of the dynamic oil baffle ring (3) is provided with a shaft hole, and the lower end is provided with a cavity for accommodating the static oil baffle ring (2). The upper end of the static oil baffle ring (2) extends into the cavity of the dynamic oil baffle ring (3).

2. The split-type mechanical seal device for vertical shaft bearings according to claim 1, wherein A sealing ring groove is provided near the lower end of the inner cavity of the static oil baffle ring (2), and a sealing ring (6) is arranged therein.

3. The split-type mechanical seal device for vertical shaft bearings according to claim 2, characterized in that, The sealing ring (6) is a skeleton sealing ring.

4. The split-type mechanical seal device for vertical shaft bearings according to claim 1, 2 or 3, characterized in that, Several circles of oil baffle ring grooves (7) are provided on the outer periphery of the part where the upper end of the static oil baffle ring (2) extends into the cavity of the dynamic oil baffle ring (3).

5. The vertical split-type mechanical seal device according to claim 4, characterized in that, The oil baffle ring groove (7) is provided with a downward inclined surface.

6. The split type mechanical seal device for vertical shaft bearing as described in claim 1, wherein, A ring groove is provided at the shaft hole below the sealed end cover (1). The static oil baffle ring (2) is fixed at the shaft hole of the sealed end cover (1) by matching a circumferential convex rib provided on its outer periphery with the ring groove.

7. The split-type mechanical seal device for vertical shaft bearings according to claim 1, characterized in that, An outward flange (8) is provided along the edge at the lower end of the dynamic oil baffle ring (3).

8. The split type mechanical seal device for vertical shaft bearing as claimed in claim 1 or 7, characterized in that, The two half pieces of the dynamic oil baffle ring (3) are clamped together by the cooperation of tenons and grooves and fixedly connected by bolts.

9. The split-type mechanical seal device for vertical shaft bearings according to claim 1, characterized in that, The sealed end covers (1) are clamped together by the cooperation of tenons and grooves and fixedly connected by bolts.

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