Combined rotary sealing structure of oil lubricated bearing

Abstract

The invention discloses a combined rotary sealing structure of an oil lubricated bearing. The combined rotary sealing structure comprises an air bag sealing assembly, a labyrinth sealing assembly and a lubricating oil leakage collecting assembly. The air bag sealing assembly comprises a sealing air bag frame, a sealing air bag body, an air bag inflation / exhaust pipeline, an air supply control device of the air bag inflation / exhaust pipeline and an air bag sealing fastener, and the labyrinth sealing assembly is composed of a labyrinth sealing movable ring, a labyrinth sealing static ring and a labyrinth sealing installation fastener. The lubricating oil leakage collecting assembly is composed of a leakage collecting cover and a leakage collecting oil tank connected with the leakage collecting cover through a leakage collecting pipeline. By means of the combination of the air bag sealing assembly and the labyrinth sealing assembly, replacement of a framework oil seal for a traditional oil lubrication bearing is achieved, sealing is achieved by adopting an inflation journal sticking mode of the air bag sealing assembly in the static state of a shaft, sealing is achieved by means of the labyrinth sealing assembly in the rotating state, and the novel structure reduces the overhaul difficulty of equipment and improves the service life of the equipment. And the equipment maintenance period of the equipment is prolonged from 5 years to 10 years.

Description

Technical Field

[0001] This invention belongs to the field of motor bearings, and specifically relates to a combined rotary seal structure for oil-lubricated bearings. Background Technology

[0002] Conventional motor oil-lubricated bearings mainly use a skeleton oil seal sealing structure. This sealing structure relies on the friction and pressure between multiple sets of lip seal rubber parts and the shaft to achieve the rotary sealing function.

[0003] Due to the lifespan and wear of the lip seal rubber component itself, it generally needs to be removed and replaced with a new lip seal rubber component every 5 years.

[0004] Currently, disassembling the multiple sets of lip seal rubber components of motor frame oil seals is complex, requiring the removal of bearings for individual replacement. This results in short maintenance cycles, long maintenance times, significant equipment downtime losses, and high maintenance costs. Summary of the Invention

[0005] One of the objectives of this invention is to overcome the aforementioned difficulties and provide a novel combined rotary seal structure for oil-lubricated bearings. This new structure avoids frequent replacement of vulnerable parts, extends the equipment maintenance cycle from 5 years to 10 years, reduces the need for equipment maintenance and protection, reduces maintenance costs, and reduces equipment downtime.

[0006] The technical solution adopted by this invention to solve its technical problem is: a combined rotary seal structure for oil-lubricated bearings, including an airbag sealing assembly, a labyrinth seal assembly, and an oil leakage collection assembly; the airbag sealing assembly includes a sealing airbag frame located outside the motor shaft and bearing, a sealing airbag body mounted on the sealing airbag frame, an airbag inflation / deflation pipeline and its air supply control device, and fasteners for airbag sealing. The minimum clearance between the sealing airbag body and the motor shaft in the uninflated state is greater than the maximum runout of the motor shaft during operation; the bearing pressure between the airbag body and the motor shaft in the inflated state is greater than the pressure of the lubricating oil in the bearing cavity. The airbag inflation / deflation pipeline and its air supply control device determine whether to inflate / deflate the sealing airbag body according to the rotation state of the motor shaft: before the motor starts running, the airbag is inflated / deflated... The exhaust pipe and its air supply control device will complete the exhaust of the sealing airbag body, and the sealing airbag body will loosen the shaft to prevent the shaft from rotating and causing wear to the airbag; when the motor starts and before it stops running, the airbag inflation / exhaust pipe and its air supply control device will complete the inflation of the sealing airbag body to prevent the shaft from stopping rotating. After that, the lubricating oil leakage will overflow from the labyrinth seal assembly, thus achieving shaft sealing; the labyrinth seal assembly consists of a labyrinth seal moving ring, a labyrinth seal stationary ring and labyrinth seal mounting fasteners installed outside the motor shaft; the lubricating oil leakage collection assembly consists of a leakage collection cover installed on the labyrinth seal stationary ring outside the motor shaft by leakage collection mounting fasteners, used to collect lubricating oil leakage from the labyrinth seal assembly, and a leakage collection oil tank connected to the leakage collection cover by a leakage collection pipe.

[0007] The combined rotary seal structure of the oil-lubricated bearing has an airbag seal assembly, a labyrinth seal assembly, and an oil leakage collection assembly configured on one or both sides of the bearing.

[0008] The aforementioned combined rotary seal structure for an oil-lubricated bearing, when the labyrinth seal is applied to a thrust bearing, comprises a labyrinth seal rotating ring for bearing radial offset, a labyrinth seal stationary ring, and labyrinth seal mounting fasteners.

[0009] The aforementioned combined rotary seal structure for oil-lubricated bearings, when the labyrinth seal is applied to a non-thrust bearing, comprises a labyrinth seal rotating ring for bearing axial displacement, a labyrinth seal stationary ring, and labyrinth seal mounting fasteners.

[0010] The aforementioned combined rotary seal structure for an oil-lubricated bearing has a leakage collection oil tank located at the bottom of a leakage collection cover, which uses gravity to guide the leakage oil collected at the bottom of the leakage collection cover into the leakage collection pipeline.

[0011] The aforementioned combined rotary seal structure for an oil-lubricated bearing has a leakage collection tank equipped with a liquid level detection sensor, an oil discharge pump, and an oil discharge pipeline. When the liquid level approaches a set value, an alarm will be triggered, the oil discharge pump will start, and the leaked oil will be filtered from the oil discharge pipeline and injected back into the bearing cavity or directly discharged to the outside of the equipment.

[0012] The combined rotary seal structure of the oil-lubricated bearing has a sealing airbag body made of rubber material with a service life of not less than 10 years to ensure that its replacement cycle reaches 10 years.

[0013] The present invention has the following beneficial effects:

[0014] 1. The present invention replaces the skeleton oil seal with a rotary seal in the rotating state, which greatly reduces the friction between the rotary seal and the rotating shaft and improves the transmission efficiency of the shaft system.

[0015] 2. The present invention extends the replacement and maintenance cycle of the rotary seal—increasing the maintenance cycle from 5 years to 10 years, reducing equipment downtime for maintenance and extending the equipment's operating time.

[0016] 3. During maintenance, only a single sealing airbag body needs to be replaced. Compared with traditional skeleton oil seals that require the replacement of multiple sets of lip seal rubber parts, this new structure simplifies the sealing maintenance process and requirements, shortens maintenance time, and improves maintenance efficiency. Attached Figure Description

[0017] Figure 1 A schematic diagram illustrating the configuration of a labyrinth seal assembly capable of withstanding radial displacement according to the present invention;

[0018] Figure 2 A schematic diagram illustrating the configuration of a labyrinth seal assembly capable of withstanding axial displacement according to the present invention;

[0019] Figure 3 This is a partial schematic diagram for implementing Case 2.

[0020] The reference numerals in the attached drawings are as follows: 1—Sealing airbag frame, 2—Sealing airbag body, 3—Airbag inflation / deflation pipeline and its air supply control device, 4—Airbag sealing fastener, 5—Labyrinth seal moving ring, 6—Labyrinth seal stationary ring, 7—Labyrinth seal mounting fastener, 8—Leakage collection cover, 9—Leakage collection oil tank, 10—Leakage collection pipeline, 11—Leakage collection mounting fastener. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Example 1: As Figure 1 , Figure 2As shown, this invention discloses a combined rotary seal structure for oil-lubricated bearings. The motor shaft and both sides of the bearing utilize a combination of airbag seal components and labyrinth seal components to achieve a sealing function: when the shaft system stops rotating, the airbag seal component inflates to achieve a shaft-clamping seal; before the shaft system starts rotating, the airbag seal component deflates to release the shaft clamp. Utilizing the centrifugal force and suction effect during rotation, the labyrinth seal component ensures the sealing function of the shaft system during rotation. During the switching between rotating and stationary states of the shaft system, a small amount of lubricating oil leakage may occur; the leaked lubricating oil is collected by an oil leakage collection component to prevent oil overflow and contamination of the equipment.

[0023] The airbag sealing assembly includes a sealing airbag frame 1 located outside the motor shaft, a sealing airbag body 2 mounted on the sealing airbag frame 1, an airbag inflation / deflation pipeline and its air supply control device 3, and airbag sealing fasteners 4. When the sealing airbag body 2 is not inflated, the minimum clearance between it and the motor shaft is greater than the maximum runout of the motor shaft during operation, preventing wear from contact with the rotating shaft system. When inflated, the bearing pressure between it and the motor shaft is greater than the pressure of the lubricating oil in the bearing cavity, preventing lubricating oil leakage from the shaft system. The sealing airbag body 2 is made of rubber material with a service life of not less than 10 years to ensure a replacement cycle of 10 years.

[0024] This new rotary seal structure avoids the need to replace the lip seal rubber part every 5 years when using a traditional skeleton oil seal rotary seal, extending the maintenance cycle of the oil-lubricated bearing seal structure to 10 years and reducing the need for equipment maintenance.

[0025] The airbag inflation / deflation pipeline and its air supply control device 3 determine whether to inflate / deflate the sealed airbag body 2 based on the rotation state of the motor shaft: before the motor starts running, the airbag inflation / deflation pipeline and its air supply control device 3 will complete the deflation of the sealed airbag body 2, and the sealing airbag body 2 will loosen its shaft to prevent the shaft from rotating and causing wear to the airbag; before the motor stops running after starting, the airbag inflation / deflation pipeline and its air supply control device 3 will complete the inflation of the sealed airbag body 2 to prevent a large amount of lubricating oil from overflowing from the labyrinth seal assembly after the shaft stops rotating, thus achieving shaft sealing.

[0026] The labyrinth seal assembly consists of a labyrinth seal moving ring 5, a labyrinth seal stationary ring 6, and a labyrinth seal mounting fastener 7, all disposed outside the motor shaft. The lubricating oil leakage collection assembly consists of a leakage collection cover 8, mounted on the labyrinth seal stationary ring 6 outside the motor shaft via a leakage collection mounting fastener 11, for collecting lubricating oil leaking from the labyrinth seal assembly, and a leakage collection oil tank 9 connected to the leakage collection cover 8 via a leakage collection pipeline 10. The leakage collection cover 8 is located on the outermost side and is used to collect lubricating oil leaking from the labyrinth seal assembly.

[0027] The labyrinth seal assembly needs to be compatible with the bearing type: when the labyrinth seal is applied to a thrust bearing, a matching structure of labyrinth seal moving ring 5 and labyrinth seal stationary ring 6 that can withstand radial displacement is selected; when the labyrinth seal is applied to a non-thrust bearing, a matching structure of labyrinth seal moving ring 5 and labyrinth seal stationary ring 6 that can withstand axial displacement is selected.

[0028] The leakage collection tank 9 is located at the bottom of the leakage collection cover 8. Leakage oil collected at the bottom of the leakage collection cover 8 is guided by gravity through the leakage collection pipe 10. The leakage collection tank 9 is equipped with a liquid level detection sensor, an oil discharge pump, and an oil discharge pipe. When the liquid level approaches a set value, an alarm is triggered, the oil discharge pump starts, and the leaked oil is filtered through the oil discharge pipe and returned to the bearing cavity or directly discharged outside the equipment.

[0029] Example 2: This example differs from Example 1 in that the bearing is equipped with an airbag seal assembly, a labyrinth seal assembly, and an oil leakage collection assembly only on one side. The other side achieves static sealing using a sealing cover with a gasket or O-ring, such as... Figure 3 As shown.

[0030] Example 3: The difference between this example and Example 1 is that the leakage collection tank 9 is not equipped with an oil drain pump and oil drain pipeline, but its volume is increased to ensure that the leaked lubricating oil will not fill the leakage collection tank within 10 years.

[0031] Example 4: The difference between this example and Example 1 is that the leak collection tank is not equipped with a drain pump, and the leaked liquid is discharged by means of a suction pump connected to the drain pipe.

[0032] Example 5: The difference between this example and Example 1 is that the installation positions of the airbag sealing assembly and the labyrinth sealing assembly are interchanged—the labyrinth sealing assembly is installed near the bearing, and the airbag sealing assembly is installed outside the labyrinth sealing assembly.

[0033] The above description is a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined rotary seal structure for an oil lubricated bearing, characterized by: The system includes an airbag sealing assembly, a labyrinth sealing assembly, and a lubricating oil leakage collection assembly installed outside the motor shaft and bearings. The airbag sealing assembly includes a sealing airbag frame (1) and a sealing airbag body (2) installed on the sealing airbag frame (1), an airbag inflation / deflation pipeline and its air supply control device (3), and airbag sealing fasteners (4). The minimum clearance between the sealing airbag body (2) and the motor shaft in the non-inflated state is greater than the maximum runout of the motor shaft during operation. In the inflated state, the bearing pressure between the sealing airbag body (2) and the motor shaft is greater than the pressure of the lubricating oil in the bearing cavity. Before the motor starts, the airbag inflation / deflation pipeline and its air supply control device (3) complete the sealing of the airbag. The main body (2) is vented, the sealing airbag main body (2) is loosened, and before the motor stops running after starting, the airbag inflation / exhaust pipeline and its air supply control device (3) complete the inflation of the sealing airbag main body (2); the labyrinth sealing assembly consists of a labyrinth sealing moving ring (5), a labyrinth sealing stationary ring (6) and a labyrinth sealing mounting fastener (7); the lubricating oil leakage collection assembly consists of a leakage collection cover (8) installed on the labyrinth sealing stationary ring (6) by a leakage collection mounting fastener (11) for collecting the leakage lubricating oil of the labyrinth sealing assembly, and a leakage collection oil tank (9) connected to the leakage collection cover (8) by a leakage collection pipeline (10).

2. A combined rotary seal structure for an oil-lubricated bearing according to claim 1, characterized in that The airbag sealing assembly, labyrinth sealing assembly, and lubricating oil leakage collection assembly are configured on one or both sides of the bearing.

3. A combined rotary seal structure for an oil-lubricated bearing according to claim 2, characterized in that The labyrinth seal assembly consists of a labyrinth seal moving ring (5) that bears radial offset, a labyrinth seal stationary ring (6), and labyrinth seal mounting fasteners (7).

4. The combined rotary seal structure for an oil-lubricated bearing according to claim 2, characterized in that, The labyrinth seal assembly consists of a labyrinth seal moving ring (5) that bears axial displacement, a labyrinth seal stationary ring (6), and labyrinth seal mounting fasteners (7).

5. A combined rotary seal structure for an oil-lubricated bearing according to claim 1, 2, 3, or 4, characterized in that, The leak collection tank (9) is located at the bottom of the leak collection hood (8), and the leaked oil collected at the bottom of the leak collection hood (8) is introduced into the leak collection pipeline (10) by gravity.

6. The combined rotary seal structure for an oil-lubricated bearing according to claim 5, characterized in that, The leak collection tank (9) is equipped with a liquid level detection sensor, an oil pump and an oil drain line.

7. The combined rotary seal structure for an oil-lubricated bearing according to claim 5, characterized in that, The material of the sealed airbag body (2) is rubber.

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