Secondary sealing structure of speed reducer output shaft

Abstract

The utility model relates to the technical field of sealing of output shafts of speed reducers, and particularly discloses a secondary sealing structure of an output shaft of a speed reducer, which comprises a casing, an output shaft arranged at one end of the casing through a bearing, an end cover arranged at the end part of the casing through a bolt, a framework oil seal I arranged in the end cover, and a sealing cover arranged outside the end cover. The sealing cover is fixed on the end cover through a bolt; an O-shaped ring is arranged between the sealing cover and the end cover; a second framework oil seal is arranged between the sealing cover and the output shaft. Compared with the prior art, the sealing cover is fixed through an original bolt of the end cover, reprocessing of the end cover is avoided, the setting time of the secondary sealing structure of the speed reducer output shaft is saved, the failure rate of an original sealing structure of the speed reducer output shaft is reduced, and production efficiency is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing of a reducer output shaft, and specifically discloses a secondary sealing structure of a reducer output shaft. Background Art

[0002] In the pulp and paper, chemical and other industries, vertical agitators are installed on the top of tanks, reactors and other equipment to mix materials evenly, accelerate reactions or prevent medium precipitation. In actual use, it is very likely that the process conditions require the presence of high-temperature gases and corrosive gases in tanks and reactors, which may cause the reducer oil seal to fail in harsh environments, resulting in equipment oil leakage or damage. If the equipment is disassembled, replaced or repaired at that time, it will affect production efficiency and increase costs.

[0003] In order to solve the above problems, the patent with announcement number CN216599217U discloses a double-layer sealing structure of a motor end cover, which includes a motor end cover, a dynamic sealing ring, a static sealing ring, an O-ring and a rotating shaft lip sealing ring; the static sealing ring is provided with a mounting groove and a sealing edge on the inner side, and a mounting chamber is provided on the outer side, the O-ring is arranged in the mounting groove, and the rotating shaft lip sealing ring is arranged in the mounting chamber; at least two annular grooves are arranged on the inner side of the sealing edge; the dynamic sealing ring is provided with annular teeth corresponding to the number of the annular grooves, the annular teeth are meshed with the annular grooves, and an air gap of uniform width is left between the annular teeth and the annular grooves.

[0004] In the above scheme, although a double-layer seal is set at the shaft end, its static seal ring needs to re-drill threaded holes on the end cover and fix it with bolts. The original cast end cover of the reducer needs to be reprocessed, which is easy to affect the clearance between the end cover and the bearing, and increases the time for setting the second layer of sealing structure, affecting production efficiency; furthermore, the static seal ring also needs to set inner and outer diameter tolerances with the end cover, which requires greater processing accuracy. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model provides a secondary sealing structure for the output shaft of a reducer to solve the problem that when setting a double-layer seal, it is necessary to re-drill threaded holes on the end cover and fix it with bolts. The original cast end cover of the reducer needs to be reprocessed, which easily affects the clearance fit between the end cover and the bearing, and increases the time for adding a second layer of sealing structure, thereby affecting production efficiency.

[0006] To achieve the above purpose, the technical solution of the utility model is:

[0007] A secondary sealing structure for a speed reducer output shaft comprises a casing, an output shaft is arranged at one end of the casing through a bearing, an end cover is arranged at the end of the casing through bolts, a skeleton oil seal 1 is arranged inside the end cover, and a sealing cover is arranged outside the end cover; the sealing cover is fixed to the end cover through bolts; an O-ring is arranged between the sealing cover and the end cover; and a skeleton oil seal 2 is arranged between the sealing cover and the output shaft. The sealing cover is fixed with the original bolts of the end cover, which avoids the re-processing of the end cover, saves the setting time of the secondary sealing structure of the speed reducer output shaft, reduces the failure rate of the original sealing structure of the speed reducer output shaft, and ensures production efficiency. The setting of the O-ring and the skeleton oil seal 2 ensures the sealing between the sealing cover, the end cover and the output shaft. In addition, the sealing cover does not need to match the tolerance of the inner and outer diameters of the end cover, which reduces the processing difficulty.

[0008] Preferably, a groove is provided on the sealing cover.

[0009] Preferably, three connecting plates are evenly arranged on the side wall of the sealing cover along the circumferential direction; through holes are arranged on the connecting plates; and bolts are arranged in the through holes, so as to facilitate the fixing of the sealing cover.

[0010] Preferably, the sealing cover is provided with an annular groove, and the O-ring is arranged in the annular groove, so as to ensure the stability of the arrangement of the O-ring.

[0011] Preferably, a boss is provided on the inner side wall of the sealing cover to cooperate with the second skeleton oil seal to limit the axial position of the second skeleton oil seal.

[0012] Preferably, a retaining ring is arranged outside the sealing cover, and the retaining ring is arranged on the sealing cover by screws, so as to further limit the axial position of the second skeleton oil seal and ensure sealing.

[0013] Preferably, a gap is provided between the inner side wall of the retaining ring and the output shaft to reduce the difficulty of processing the retaining ring.

[0014] The beneficial effects of the utility model are as follows: the sealing cover is fixed with the original bolts of the end cover, avoiding the re-processing of the end cover, saving the setting time of the secondary sealing structure of the output shaft of the reducer, reducing the failure rate of the original sealing structure of the output shaft of the reducer, and ensuring production efficiency. The setting of the O-ring and the skeleton oil seal ensures the sealing between the sealing cover, the end cover and the output shaft. In addition, the sealing cover does not need to match the tolerance of the inner and outer diameters of the end cover, which reduces the difficulty of processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1It is a cross-sectional schematic diagram of the utility model;

[0017] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the utility model.

[0019] Description of reference numerals:

[0020] 1- housing, 2- bearing, 3- output shaft, 4- bolt, 5- end cover, 6- sealing cover, 7- O-ring, 8- skeleton oil seal 2, 9- retaining ring, 10- skeleton oil seal 1;

[0021] 601-groove, 602-connecting plate, 603-annular groove, 604-boss. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1-3 As shown, a secondary sealing structure of a speed reducer output shaft comprises a housing 1, an output shaft 3 is arranged at one end of the housing 1 through a bearing 2, an end cover 5 is arranged at the end of the housing 1 through a bolt 4, a skeleton oil seal 10 is arranged inside the end cover 5, and a sealing cover 6 is arranged outside the end cover 5; the sealing cover 6 is fixed to the end cover 5 through a bolt 4; an O-ring 7 is arranged between the sealing cover 6 and the end cover 5; and a skeleton oil seal 2 8 is arranged between the sealing cover 6 and the output shaft 3. The sealing cover 6 is fixed by the original bolt 4 of the end cover 5, avoiding the re-processing of the end cover 5, saving the setting time of the secondary sealing structure of the speed reducer output shaft, reducing the failure rate of the original sealing structure of the speed reducer output shaft, and ensuring production efficiency. The setting of the O-ring 7 and the skeleton oil seal 2 8 ensures the sealing between the sealing cover 6, the end cover 5 and the output shaft 3. In addition, the sealing cover 6 does not need to be matched with the tolerance of the inner and outer diameters of the end cover 5, which reduces the processing difficulty.

[0025] In the above arrangement, the sealing cover 6 is provided with a groove 601. Three connecting plates 602 are evenly arranged on the side wall of the sealing cover 6 along the circumferential direction; the connecting plates 602 are provided with through holes; the bolts 4 are arranged in the through holes to facilitate the fixing of the sealing cover 6. The sealing cover 6 is provided with an annular groove 603; the O-ring 7 is arranged in the annular groove 603,

[0026] Ensure that the O-ring 7 is set stably.

[0027] Example 2

[0028] On the basis of Example 1, in order to ensure the stability of the axial position of the skeleton oil seal 2 and ensure sealing, a boss 604 is provided on the inner wall of the sealing cover 6 to cooperate with the skeleton oil seal 2 8, and a retaining ring 9 is provided on the outer side of the sealing cover 6; the retaining ring 9 is set on the sealing cover 6 by screws.

[0029] In order to reduce the difficulty of machining the retaining ring, a gap is provided between the inner wall of the retaining ring 9 and the output shaft 3 .

[0030] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions shall be within the scope of the utility model / any person of ordinary skill in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the utility model, and they shall be within the scope of protection of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope of protection of the claims.

Claims

1. A secondary sealing structure for a speed reducer output shaft, comprising a housing (1), an output shaft (3) being arranged at one end of the housing (1) via a bearing (2), an end cover (5) being arranged at the end of the housing (1) via bolts (4), a skeleton oil seal (10) being arranged in the end cover (5), characterized in that: A sealing cover (6) is arranged outside the end cover (5); the sealing cover (6) is fixed to the end cover (5) by means of bolts (4); an O-ring (7) is arranged between the sealing cover (6) and the end cover (5); and a second skeleton oil seal (8) is arranged between the sealing cover (6) and the output shaft (3).

2. The secondary sealing structure of the output shaft of the reducer according to claim 1, characterized in that: The sealing cover (6) is provided with a groove (601).

3. The secondary sealing structure of the output shaft of the reducer according to claim 2, characterized in that: Three connecting plates (602) are evenly arranged on the side wall of the sealing cover (6) along the circumferential direction; a through hole is arranged on the connecting plate (602); and the bolt (4) is arranged in the through hole.

4. The secondary sealing structure of the output shaft of the reducer according to claim 3, characterized in that: An annular groove (603) is provided on the sealing cover (6); an O-ring (7) is arranged in the annular groove (603).

5. The secondary sealing structure of the output shaft of the reducer according to claim 4, characterized in that: A boss (604) is provided on the inner wall of the sealing cover (6) to cooperate with the second skeleton oil seal (8).

6. The secondary sealing structure of the output shaft of the reducer according to claim 5, characterized in that: A retaining ring (9) is arranged on the outside of the sealing cover (6); the retaining ring (9) is arranged on the sealing cover (6) by means of screws.

7. The secondary sealing structure of the output shaft of the reducer according to claim 6, characterized in that: A gap is provided between the inner wall of the retaining ring (9) and the output shaft (3).

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