A speed reducer shaft sealing device

Abstract

The utility model relates to a speed reducer shaft sealing device belongs to electrolytic aluminium production auxiliary tool technical field, include: end cover inlay is equipped with support ring, the inner ring of support ring is equipped with the expansion ring for sealing rotating shaft, and the rotating shaft passes through the inner ring of expansion ring, and the expansion ring inside is equipped with the air bag ring for reducing the inside diameter of expansion ring, the utility model sets up the rotating shaft sealed by normally closed sealing lip, after normally closed sealing lip failure, air bag collocates delay sealing lip makes expansion ring can seal again and obtains longer sealing working life, reduces the frequency of overhauling shutdown caused by the oil leakage of speed reducer, reduces the overhauling cost, delay sealing lip is for the extension time of subsequent unified shutdown overhaul, increases the flexibility of overhauling operation.

Description

Technical Field

[0001] This utility model relates to a gearbox shaft sealing device, belonging to the technical field of auxiliary tools for electrolytic aluminum production. Background Technology

[0002] As the electrolytic cell operates for an extended period, problems will inevitably arise with the cell and its related equipment. For example, during routine inspections of the motor reducer in the electrolytic cell, lubricating oil leakage is found at the reducer shaft seal. Typically, resolving this leakage requires replacing the reducer oil seal. Currently, most reducers use traditional skeleton oil seals, which require disassembling the reducer before replacement. This time-consuming process means that the anode of the electrolytic cell cannot rise or fall for an extended period, disrupting normal production and increasing maintenance costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a reducer shaft sealing device that improves the sealing performance of the reducer, extends the service life of the oil seal, reduces the frequency of maintenance, and also reduces the maintenance costs caused by production stoppage due to maintenance.

[0004] The present invention relates to a gearbox shaft sealing device, comprising: a rotating shaft and an end cover on the gearbox, a support ring embedded in the end cover, an expansion ring for sealing the rotating shaft being fitted inside the inner ring of the support ring, the rotating shaft passing through the inner ring of the expansion ring, and an air bladder ring for reducing the inner diameter of the expansion ring being provided inside the expansion ring.

[0005] Furthermore, the expansion ring includes: an expansion groove and a compression groove arranged in a corrugated pattern from the outer ring to the inner ring;

[0006] The airbag ring is placed inside the expansion groove;

[0007] The compression groove is equipped with a reinforcing ring to enhance the stiffness of the expansion ring;

[0008] The expansion ring has a shaft hole at its center. The shaft hole wall has a normally closed sealing lip and a delayed sealing lip. The normally closed sealing lip fits against the outer wall of the shaft, and the delayed sealing lip leaves a gap with the outer wall of the shaft.

[0009] Furthermore, the opening of the expansion groove is positioned opposite to the opening of the compression groove;

[0010] The opening of the compression groove faces the lubricating oil side of the reducer.

[0011] The normally closed sealing lip is positioned at the end closest to the opening of the compression groove, while the delayed sealing lip is positioned at the end furthest from the opening of the compression groove.

[0012] The opening of the expansion groove faces the side where the outer end face of the end cap is located;

[0013] Both the expansion tank and the compression tank are constricted from the bottom to the opening.

[0014] Furthermore, several disassembly holes are evenly provided on the outer end face of the support ring.

[0015] Furthermore, the airbag ring includes: an airbag, a gas filling hose connected to the airbag, and a nozzle on the gas filling hose for connecting to an external gas source.

[0016] Furthermore, the gas filling hose passes through the opening of the expansion tank.

[0017] The advantages of this utility model compared with the prior art are:

[0018] Under normal conditions, the normally closed sealing lip can directly seal the rotating shaft. After the normally closed sealing lip fails, the airbag combined with the delayed sealing lip allows the expansion ring to seal again and achieves a longer sealing service life. This reduces the frequency of maintenance downtime caused by gearbox oil leakage and lowers maintenance costs. The delayed sealing lip also provides extended time for subsequent unified shutdown and overhaul, increasing the flexibility of maintenance operations. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional view of a gearbox shaft sealing device according to the present invention;

[0020] Figure 2 This is a cross-sectional structural schematic diagram of a reducer shaft sealing device according to the present invention;

[0021] Figure 3 This is a schematic diagram of the airbag ring structure of a reducer shaft sealing device according to this utility model;

[0022] Figure 4 This is a schematic diagram of the installation structure of a reducer shaft sealing device according to this utility model;

[0023] Figure 5 This is a schematic diagram of the installation cross-sectional structure of a gearbox shaft sealing device according to the present invention.

[0024] In the picture:

[0025] 1. Support ring; 101. Removal hole;

[0026] 2. Expansion ring; 201. Expansion groove; 202. Reinforcing ring; 203. Compression groove; 204. Normally closed sealing lip; 205. Delayed sealing lip; 206. Shaft hole;

[0027] 3. Airbag ring; 301. Airbag; 302. Inflation hose; 303. Air nozzle;

[0028] 4. End caps;

[0029] 5. Shaft. Detailed Implementation

[0030] like Figures 1-5 As shown, this embodiment is achieved through the following technical solution: a rotating shaft 5 and an end cover 4 on the reducer, a support ring 1 is embedded in the end cover 4, an expansion ring 2 for sealing the rotating shaft 5 is fitted inside the inner ring of the support ring 1, the rotating shaft 5 passes through the inner ring of the expansion ring 2, and an air bladder ring 3 for reducing the inner diameter of the expansion ring 2 is provided inside the expansion ring 2.

[0031] Specifically, the expansion ring 2 is made of elastic sealing material and includes: an expansion groove 201 and a compression groove 203 arranged in a corrugated shape from the outer ring to the inner ring; an airbag ring 3 is disposed in the expansion groove 201;

[0032] The compression groove 203 is provided with a reinforcing ring 202 to enhance the stiffness of the expansion ring 2;

[0033] The expansion ring 2 has a shaft hole 206 at its center. The shaft hole 206 has a normally closed sealing lip 204 and a delayed sealing lip 205 on its hole wall. The normally closed sealing lip 204 fits against the outer wall of the rotating shaft 5, and the delayed sealing lip 205 leaves a gap with the outer wall of the rotating shaft 5.

[0034] Specifically, the opening of the expansion groove 201 is positioned opposite to the opening of the compression groove 203.

[0035] The opening of the compression groove 203 faces the lubricating oil side inside the reducer.

[0036] The normally closed sealing lip 204 is positioned at the end close to the opening of the compression groove 203, and the delayed sealing lip 205 is positioned at the end away from the opening of the compression groove 203.

[0037] The opening of the expansion groove 201 faces the side where the outer end face of the end cap 4 is located;

[0038] Both the expansion tank 201 and the compression tank 203 are in a contracted state from the bottom to the opening.

[0039] Specifically, a number of disassembly holes 101 are evenly provided on the outer end face of the support ring 1.

[0040] Specifically, the airbag ring 3 includes: an airbag 301, and an air filling hose 302 connected to the airbag 301. The air filling hose 302 is provided with an air nozzle 303 for connecting to an external air source.

[0041] Specifically, the gas filling hose 302 passes through the opening of the expansion tank 201.

[0042] The specific working principle of this utility model is as follows:

[0043] Conventionally, the normally closed sealing lip 204 is fitted to the outer wall of the rotating shaft 5 for sealing. When the normally closed sealing lip 204 wears and fails, lubricating oil leaks outward along the axial surface of the rotating shaft 5. After the staff discovers the leakage during inspection, high-pressure gas is injected into the airbag ring 3. The airbag 301 expands and squeezes the expansion groove 201. The expansion groove 201 is rigidly supported by the support ring 1 on one side. Therefore, the expansion groove 201 further squeezes the elastic compression groove 203. The compression groove 203 drives the normally closed sealing lip 204 and the delayed sealing lip 205 to fit against the outer wall of the rotating shaft 5, further strengthening the sealing effect. This allows the expansion ring 2 to regain reliable sealing performance, increases the overall service life of the device, and reduces the maintenance frequency.

[0044] Of course, the above description is only a preferred embodiment of this utility model and should not be considered as limiting the scope of the embodiments of this utility model. This utility model is not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of this utility model should be included in the patent coverage of this utility model.

Claims

1. A gearbox shaft sealing device, comprising: The rotating shaft (5) and end cover (4) on the reducer are characterized in that: a support ring (1) is provided on the end cover (4), and an expansion ring (2) for sealing the rotating shaft (5) is provided on the inner ring of the support ring (1), the rotating shaft (5) passes through the inner ring of the expansion ring (2), and an air bladder ring (3) for reducing the inner diameter of the expansion ring (2) is provided inside the expansion ring (2). The expansion ring (2) includes an expansion groove (201) and a compression groove (203) arranged in a corrugated shape from the outer ring to the inner ring; the airbag ring (3) is disposed in the expansion groove (201); The expansion ring (2) has a shaft hole (206) at its center. The shaft hole (206) has a normally closed sealing lip (204) and a delayed sealing lip (205) on its hole wall. The normally closed sealing lip (204) fits against the outer wall of the rotating shaft (5), and there is a gap between the delayed sealing lip (205) and the outer wall of the rotating shaft (5). The airbag ring (3) includes: an airbag (301), an air filling hose (302) connected to the airbag (301), and an air nozzle (303) for connecting to an external air source on the air filling hose (302).

2. The gearbox shaft sealing device according to claim 1, characterized in that, The compression groove (203) is provided with a reinforcing ring (202) to enhance the stiffness of the expansion ring (2).

3. A reducer shaft sealing device according to claim 2, characterized in that, The opening of the expansion groove (201) is positioned opposite to the opening of the compression groove (203); The opening of the compression groove (203) faces the lubricating oil side inside the reducer. The normally closed sealing lip (204) is located at the end close to the opening of the compression groove (203), and the delayed sealing lip (205) is located at the end away from the opening of the compression groove (203); The opening of the expansion groove (201) faces the side where the outer end face of the end cap (4) is located; The expansion tank (201) and the compression tank (203) are both in a contracted state from the bottom to the opening.

4. A reducer shaft sealing device according to claim 1, characterized in that, Several disassembly holes (101) are evenly provided on the outer end face of the support ring (1).

5. A reducer shaft sealing device according to claim 1, characterized in that, The gas filling hose (302) passes through the opening of the expansion tank (201).

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