CN106884972B

CN106884972B - Labyrinth sealing structure of input shaft of gear box

Info

Publication number: CN106884972B
Application number: CN201710120366.6A
Authority: CN
Inventors: 张保松; 陆群峰; 熊雪梅; 乐永祥; 包为刚; 吴浩
Original assignee: CRRC Qishuyan Institute Co Ltd
Current assignee: CRRC Qishuyan Institute Co Ltd
Priority date: 2017-03-02
Filing date: 2017-03-02
Publication date: 2024-03-29
Anticipated expiration: 2037-03-02
Also published as: CN106884972A

Abstract

The labyrinth sealing structure of the input shaft of the gear box comprises a box body, a bearing, an input shaft and an end cover, wherein an annular lubricating cavity is formed in the rear end face of the end cover, so that an inner convex ring and an outer convex ring are formed in the rear end face of the end cover, the outer convex ring abuts against the outer ring of the bearing, a lubricating oil introducing channel is formed in the box body, an oil inlet hole connected with the introducing channel is formed in the end cover, the oil inlet hole is connected with an orifice, and an outlet of the orifice is aligned with a raceway of the bearing; the inner wall of the shaft hole of the end cover is provided with an annular small labyrinth cavity, a large labyrinth cavity and a dustproof cavity from back to front, the bottom of the small labyrinth cavity is connected with the lubricating cavity through an oil return hole, the lower part of the end cover is symmetrically provided with 2 oil discharging grooves communicated with the lubricating cavity and 3 oil discharging holes communicated with the large labyrinth cavity, and the oil discharging grooves and the oil discharging holes are respectively communicated with corresponding oil return holes on the box body. The utility model has simple integral structure, realizes the functions of bearing limit, forced injection of lubricating oil, dust prevention and water prevention while realizing the sealing function of the gear box, and has high functional integration level.

Description

Labyrinth sealing structure of input shaft of gear box

Technical Field

The utility model relates to a labyrinth seal structure of an input shaft of a gear box. The method is particularly suitable for being used on wind generating sets.

Background

The wind generating set can convert wind energy into electric energy, most wind generating sets comprise speed increasing gearboxes, the speed of the wind wheel can be increased to be suitable for the power generation of a generator, the wind generating gearboxes are used as key components of a fan, the design life is required to be 20 years, the contact type seal cannot meet the requirement of the service life of 20 years, and the maintenance is required. The utility model of China application number 200920256847.0 provides a sealing device of a wind power generation speed increasing gear box and the utility model of China patent application number 201320124516.8 discloses a labyrinth sealing structure of an output shaft sealing device, and for non-contact labyrinth sealing, the requirements of working conditions can be met under the condition of no maintenance, but if the number of parts is increased, the size chain is complicated, the reliability of the labyrinth sealing is reduced, the robustness of a system is poor, and the reliability of the system is reduced. The two utility models are applied to the mechanical sealing ring, so that the daily maintenance is avoided.

Disclosure of Invention

The utility model aims to provide a labyrinth sealing structure of a gearbox input shaft, which has a simple structure, high functional integration level and no need of maintenance.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model comprises a box body, an input shaft connected with the box body through a bearing, and an end cover sleeved on the input shaft and connected with a box body fastener, wherein an annular lubricating cavity is arranged on the rear end face of the end cover, so that an inner convex ring and an outer convex ring are formed on the rear end face of the end cover, the outer convex ring is propped against the outer ring of the bearing, a process gap is formed between the inner convex ring and the bearing, a lubricating oil introducing channel is arranged on the box body, an oil inlet hole connected with the introducing channel is arranged on the end cover, the oil inlet hole is connected with an orifice, and the outlet of the orifice is aligned with a raceway of the bearing; the inner wall of the shaft hole of the end cover is provided with an annular small labyrinth cavity, a large labyrinth cavity and a dustproof cavity from back to front, the process gap is connected with the small labyrinth cavity through a rear throttling annular gap, the small labyrinth cavity is connected with the large labyrinth cavity through a middle throttling annular gap, and the large labyrinth cavity is connected with the dustproof cavity through a front throttling annular gap; the bottom of the small labyrinth cavity is connected with the lubricating cavity through an oil return hole, the lower part of the end cover is symmetrically provided with 2 oil drain grooves communicated with the lubricating cavity and 3 oil drain holes communicated with the large labyrinth cavity, the oil drain grooves and the oil drain holes are respectively communicated with corresponding oil return holes on the box body, and the bottom of the end cover is provided with a drain hole connected with the dustproof cavity.

The inner wall of the box body is provided with a transition groove which is connected with the oil return hole and is opposite to the outlet of the oil drain groove, and the oil drain groove is connected with the oil return hole through the transition groove.

Two oil slingers are arranged on the input shaft and correspond to the big labyrinth cavity.

The lubricating oil introducing passage is stepped.

The oil inlet hole and the throttling hole are in a fold line shape.

The inner side of the lubricating cavity is provided with an inclined surface, and the inclined angle a is 72-78 degrees.

The cross section of the small labyrinth cavity is arc-shaped.

The cross section of the big labyrinth cavity is U-shaped.

The cross section of the dustproof cavity is arc-shaped.

The cross section of the transition groove is arc-shaped.

The utility model has the following positive effects: (1) the structure of the utility model is optimized, the multistage labyrinth cavity is realized through the assembly combination of the four parts of the box body, the bearing, the input shaft and the end cover, the sealing function of the gear box is realized, the functions of limiting the bearing, forced injection of lubricating oil, dust prevention and water prevention are realized, the function integration level is realized, and maintenance is not required. (2) The utility model has simple integral structure, low requirement on the processing precision of parts and convenient assembly. (3) Parts are simplified, and the reliability of the product is improved.

Drawings

Fig. 1 is a structural diagram of the present utility model.

Fig. 2 is a B-B cross-sectional view of fig. 1.

Fig. 3 is a C-C cross-sectional view of fig. 1.

Fig. 4 is an enlarged view of section i of fig. 1.

Fig. 5 is an enlarged view of section ii of fig. 1.

Detailed Description

Example 1

The embodiment 1 shown in fig. 1 to 5 comprises a box 1, an end cover 2, an input shaft 3 and a bearing 4, wherein the input shaft 3 is connected with the box 1 through the bearing 4, and the end cover 2 is sleeved at the front end of the input shaft 3 and connected with a fastener of the box 1. The rear end face of the end cover 2 is provided with an annular lubrication cavity 2-3, so that an inner convex ring 2-12 and an outer convex ring 2-11 are formed on the rear end face of the end cover 2, the outer convex ring 2-11 abuts against the outer ring of the bearing 4, and a process gap 2-a is formed between the inner convex ring 2-12 and the bearing 4 in order to ensure that the bearing can rotate freely.

The inner side of the lubrication chamber 2-3 is provided with a chamber wall surface with an inclined surface, the inclined angle a is 72-78 degrees, and the inclined angle a in the embodiment is 75 degrees.

The box body 1 is provided with a lubricating oil introducing channel 1-1, the end cover 2 is provided with an oil inlet hole 2-1 which is connected with the introducing channel 1-1, the oil inlet hole 2-1 is connected with an orifice 2-2, the oil inlet hole 2-1 and the orifice 2-2 are in a fold line shape, and an outlet of the orifice 2-2 is aligned with a raceway of a bearing. The lubricating oil introducing channel 1-1 is in a step shape, and the apertures of the lubricating oil introducing channel 1-1, the oil inlet hole 2-1 and the throttle hole 2-2 are reduced hole by hole.

The inner wall of the shaft hole of the end cover 2 is provided with an annular small labyrinth cavity 2-4, a large labyrinth cavity 2-5 and a dustproof cavity 2-6 from back to front, the cross section of the small labyrinth cavity 2-4 is arc-shaped, the cross section of the large labyrinth cavity 2-5 is U-shaped, and the cross section of the dustproof cavity 2-6 is arc-shaped. The process gap 2-a is connected with the small labyrinth cavity 2-4 through a rear throttling annular gap 2-b, the small labyrinth cavity 2-4 is connected with the large labyrinth cavity 2-5 through a middle throttling annular gap 2-c, and the large labyrinth cavity 2-5 is connected with the dustproof cavity 2-6 through a front throttling annular gap 2-d. The choke ring gap is used to release flow rate and pressure.

The small labyrinth cavity 2-4 corresponds to the lubricating cavity 2-3 in position, the bottom of the small labyrinth cavity 2-4 is connected with the lubricating cavity 2-3 through an oil return hole 2-8, 2 oil drain grooves 2-10 communicated with the lubricating cavity 2-3 and 3 oil drain holes 2-7 communicated with the large labyrinth cavity 2-5 are symmetrically arranged at the lower part of the end cover 2, and the oil drain grooves 2-10 and the oil drain holes 2-7 are respectively communicated with the corresponding oil return holes 1-3 on the box body 1. In order to facilitate connection of the oil drain groove 2-10 and the oil return hole 1-3, a transition groove 1-2 connected with the oil return hole 1-3 is arranged on the inner wall of the box body 1 opposite to the outlet of the oil drain groove 2-10, the cross section of the transition groove 1-2 is arc-shaped, and the oil drain groove 2-10 is connected with the oil return hole 1-3 through the transition groove 1-2.

The end cover 2 is provided with a blow-down hole 2-9 connected with the dustproof cavity 2-6, and the blow-down hole 2-9 is communicated with the outside.

Two oil slingers 3-1 are arranged on the input shaft 3 and correspond to the big labyrinth cavity 2-5.

The end cover 2 is fixedly connected with the box body 1 through bolts, the oil holes are free of dislocation after connection, smooth lubrication channels are ensured, the orifice 2-2 plays roles of throttling and lifting pressure, the outlet angle of the orifice is just aligned with the raceway of the bearing 4, lubricating oil is sprayed on the bearing raceway and the roller end face through the orifice 2-2 under the action of external pressure, primary lubrication, cooling and flushing of the bearing are completed, most of pressure oil can enter a lubricating oil pool through the bearing in the spraying process, but still part of lubricating oil can rebound to the lubricating cavity 2-3, the cavity wall surface at the inner side of the lubricating cavity 2-3 is an inclined plane, most of anti-rebound lubricating oil can reach the bottom of the lubricating cavity along the surface of the lubricating cavity, and when the lubricating oil level at the bottom of the lubricating cavity 2-3 reaches a certain height, the lubricating oil can pass through the bearing raceway again, and secondary lubrication and cooling of the bearing 4 are completed.

If the lubricating oil in the lubricating cavity can not be completely returned to the oil pool through the bearing, the height of the lubricating oil level in the lubricating cavity can be gradually increased, and the lubricating oil returns to the oil pool through an oil return channel consisting of the oil drain groove 2-10, the transition groove 1-2 and the oil return hole 1-3, so that the problems of overlarge stirring loss and sealing failure of the bearing caused by the accumulation of the lubricating oil are avoided.

The presence of the process gap 2-a necessarily results in a certain amount of lubricating oil, possibly under pressure, entering the labyrinth cavity, which must be depressurized and refluxed. The lubricating oil in the process gap 2-a enters the small labyrinth cavity 2-4 through the rear throttling annular gap 2-b, one part of the lubricating oil in the small labyrinth cavity 2-4 is guided back to the lubricating cavity 2-3 through the oil return hole 2-8, the other part of the lubricating oil enters the large labyrinth cavity 2-5 through the middle throttling annular gap 2-c, and flows to the bottom of the large labyrinth cavity 2-5 under the action of gravity, and returns to an oil pool through the 3 oil drain holes 2-7 formed in the bottom.

Because the working environment of the fan has large temperature difference and dust in partial areas, dust and condensation can be accumulated near the labyrinth, if the pollutants enter the gear box, the service life of rotating bearing parts such as gears, bearings and the like can be influenced, and therefore, the dustproof cavity 2-6 is designed, and the pollutant discharge is realized by arranging the blow-down holes 2-9 communicated with the dustproof cavity 2-6 at the bottom of the end cover.

Claims

1. The utility model provides a gearbox input shaft labyrinth seal structure, including box (1), input shaft (3) that are connected with box (1) through bearing (4), cover (2) that are connected with box (1) fastener on input shaft (3), be equipped with annular lubrication chamber (2-3) on the rear end face of cover (2), thereby form interior bulge loop and outer bulge loop on the rear end face of cover (2), outer bulge loop offsets with the outer lane of bearing (4), technological clearance (2-a) are equipped with between interior bulge loop and bearing (4), be equipped with lubricating oil introduction channel (1-1) on box (1), be equipped with oil feed hole (2-1) that are connected with introduction channel (1-1) on cover (2), oil feed hole (2-1) connect orifice (2-2), the export of orifice (2-2) is aimed at the raceway of bearing; the method is characterized in that:

the inner side wall surface of the lubrication cavity (2-3) is an inclined surface; an annular small labyrinth cavity (2-4), a large labyrinth cavity (2-5) and a dustproof cavity (2-6) are arranged on the inner wall of the shaft hole of the end cover (2) from back to front, the process gap (2-a) is connected with the small labyrinth cavity (2-4) through a back throttling annular gap (2-b), the small labyrinth cavity (2-4) is connected with the large labyrinth cavity (2-5) through a middle throttling annular gap (2-c), and the large labyrinth cavity (2-5) is connected with the dustproof cavity (2-6) through a front throttling annular gap (2-d); the bottom of the small labyrinth cavity (2-4) is connected with the lubricating cavity (2-3) through an oil return hole (2-8), 2 oil drain grooves (2-10) communicated with the lubricating cavity (2-3) and 3 oil drain holes (2-7) communicated with the large labyrinth cavity (2-5) are symmetrically arranged at the lower part of the end cover (2), the oil drain grooves (2-10) and the oil drain holes (2-7) are respectively communicated with corresponding oil return holes (1-3) on the box body (1), and a drain hole (2-9) connected with the dust prevention cavity (2-6) is arranged at the bottom of the end cover (2);

a transition groove (1-2) connected with the oil return hole (1-3) is arranged on the inner wall of the box body (1) opposite to the outlet of the oil drain groove (2-10), and the oil drain groove (2-10) is connected with the oil return hole (1-3) through the transition groove (1-2);

two oil slingers (3-1) are arranged on the input shaft (3) and correspond to the big labyrinth cavity (2-5).

2. The gearbox input shaft labyrinth seal structure of claim 1, wherein: the lubricating oil introducing passage (1-1) is stepped.

3. The gearbox input shaft labyrinth seal structure of claim 1, wherein: the oil inlet hole (2-1) and the throttle hole (2-2) are in a fold line shape.

4. The gearbox input shaft labyrinth seal structure of claim 1, wherein: the inclined plane inclination angle a of the inner side cavity wall of the lubricating cavity (2-3) is 72-78 degrees.

5. The gearbox input shaft labyrinth seal structure of claim 1, wherein: the cross section of the small labyrinth cavity (2-4) is arc-shaped.

6. The gearbox input shaft labyrinth seal structure of claim 1, wherein: the cross section of the big maze cavity (2-5) is U-shaped.

7. The gearbox input shaft labyrinth seal structure of claim 1, wherein: the cross section of the dustproof cavity (2-6) is arc-shaped.

8. The gearbox input shaft labyrinth seal structure of claim 1, wherein: the cross section of the transition groove (1-2) is arc-shaped.