CN-121993720-A - Breather for preventing bearing box oil from dripping outside

CN121993720ACN 121993720 ACN121993720 ACN 121993720ACN-121993720-A

Abstract

The invention discloses a ventilation device for preventing oil in a bearing box from dripping outside, which comprises a shell with an inner cavity, wherein a cavity partition plate with a first gas discharge through hole is arranged in the shell, the cavity partition plate divides the inner cavity of the shell into a gas discharge cavity and an oil mist filtering cavity which are communicated up and down, an oil mist filtering mechanism which forms a spiral oil mist filtering channel is arranged in the oil mist filtering cavity, an oil mist introducing mechanism and a lubricating oil recovering mechanism are arranged at the lower end of the shell, the spiral oil mist filtering channel is communicated with the bearing box through the oil mist introducing mechanism and the lubricating oil recovering mechanism, and a second gas discharge through hole which is communicated with the outside is arranged on the side wall of the gas discharge cavity. The invention can effectively solve the problems of oil mist escape and oil liquid dripping of the motor bearing box, reduces the consumption of lubricating oil, and has the advantages of exquisite structure and no need of external power supply cooperation.

Inventors

ZHANG YUNSHENG
WU QIONG
LIU XINYU
WU XUANDONG
XING YIN
ZHAO YAN
QIAO JIANWEI
CHEN WEIWEI
AN HAIFENG
ZHANG LEI
JIANG JUAN

Assignees

卧龙电气南阳防爆集团股份有限公司
卧龙电气驱动集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. A ventilation device for preventing oil from dripping outside a bearing box is characterized by comprising a shell with an inner cavity, wherein a cavity partition plate with a first gas discharge through hole is arranged in the shell, the cavity partition plate divides the inner cavity of the shell into a gas discharge cavity and an oil mist filtering cavity which are communicated up and down, an oil mist filtering mechanism which forms a spiral oil mist filtering channel is arranged in the oil mist filtering cavity, an oil mist guiding mechanism and a lubricating oil recovery mechanism are arranged at the lower end of the shell, the spiral oil mist filtering channel is communicated with the bearing box through the oil mist guiding mechanism and the lubricating oil recovery mechanism, and a second gas discharge through hole which is communicated with the outside is arranged on the side wall of the gas discharge cavity.
2. The device for preventing oil from dripping outside the bearing housing according to claim 1, wherein the oil mist filtering mechanism is a spiral filtering baffle plate, and a plurality of filtering meshes are arranged on the filtering baffle plate.
3. The device for preventing oil from dripping outside a bearing housing according to claim 1, wherein the outlet of the oil mist introducing mechanism is arranged at the center of the spiral oil mist filtering passage.
4. The breather for preventing oil from dripping outside a bearing housing according to claim 1, wherein the inside diameter of the oil recovery mechanism is smaller than the inside diameter of the oil mist introducing mechanism.
5. The breather for preventing oil from dripping outside a bearing housing according to claim 1, wherein the highest end of the outlet of the oil mist introducing mechanism is not higher than the lower surface of the chamber partition plate, and the lowest end of the outlet of the oil mist introducing mechanism is not lower than the lower inner wall of the oil mist filter chamber.
6. The device for preventing oil from dripping outside a bearing box according to claim 1, wherein the chamber partition plate is uniformly provided with a plurality of first gas discharge through holes along the circumferential direction, and the plurality of first gas discharge through holes are positioned above the outermost ring of the spiral oil mist filtering channel.
7. The ventilation device for preventing oil from dripping outside the bearing box according to claim 1, wherein the oil mist guiding mechanism comprises a bearing box connecting part and a communicating rod, the bearing box connecting part adopts a cylindrical boss integrally arranged at the center of the bottom end of the shell, the cylindrical boss is connected with the bearing box through external threads, the center of the cylindrical boss is in threaded connection with the lower end of the communicating rod through an internal thread through hole, a vent hole with an opening at the lower end is vertically arranged at the lower part of the communicating rod along an axis, and a ventilation groove communicated with the vent hole is radially arranged at the circumference of the lower part of the communicating rod.
8. The breather for preventing oil from dripping outside the bearing box according to claim 7, wherein the housing is a cylindrical seat cylinder with an opening at the upper end and sealed by an upper cover, the outer circumference of the upper cover is provided with a downward annular convex edge, a plurality of second gas discharge through holes communicated with the outside are uniformly formed on the upper end side wall of the seat cylinder at the inner side of the annular convex edge along the circumference, the chamber partition plate is a circular cover plate matched with the inner diameter of the seat cylinder, and a plurality of first gas discharge through holes are uniformly formed on the circular cover plate above the outermost circle of the spiral oil mist filtering channel along the circumference.
9. The device for preventing oil from dripping outside the bearing housing according to claim 8, wherein the upper end surface and the lower end surface of the filtering baffle are respectively abutted against the lower surface of the circular cover plate and the lower surface of the inner cavity, and the inner diameter of the innermost circle of annular space at the center of the filtering baffle is 1.5-2 times larger than the outer diameter of the communicating rod.
10. The device for preventing oil from dripping outside the bearing box according to claim 9, wherein the centers of the round cover plate and the upper cover are respectively provided with a communication rod through hole matched with the communication rod, the upper end of the communication rod passes through the round cover plate and the upper cover through the communication rod through holes and is positioned above the upper cover, the upper end of the communication rod is further provided with a hexagonal boss, and a sealing gasket is sleeved on the communication rod between the hexagonal boss and the upper cover.

Description

Breather for preventing bearing box oil from dripping outside Technical Field The invention relates to the field of bearing box oil mist treatment, in particular to a ventilation device for preventing bearing box oil from dripping outside. Background Slide bearings are widely used as one of important support members for rotary machines in mechanical equipment such as motors, turbines, and compressors. In order to ensure the balance of the pressure inside and outside the bearing box, a C-shaped air filter (JB/ZQ 4522) is arranged above the bearing in the domestic motor sliding bearing, so that external dust can be effectively prevented from entering the bearing box. However, in the actual running process of the high-speed motor, the temperature in the bearing box is higher than the outside temperature due to friction loss generated by the high-speed running of the bearing in the bearing box, so that the oil mist generated during the high-speed running of the bearing is discharged out of the bearing box through the air filter, and meanwhile, the oil mist discharge amount is further increased along with the air pressure in the motor entering the bearing box. When the oil mist passes through the air filter, part of lubricating oil particles in the oil mist can be absorbed by the filter layer and drop out of the bearing box under the action of gravity, and meanwhile, part of lubricating oil can be condensed at the outer cover of the air filter and drop out of the bearing box under the action of gravity. The phenomenon causes serious pollution on the surface of the bearing box, causes on-site environmental pollution of the motor, and meanwhile, leaked lubricating oil also causes serious lubricating oil waste. The utility model discloses a three-dimensional oil mist collector for solving the problems of oil mist escape and oil liquid drip, which is disclosed in the utility model patent with the application number of CN202220869846.9 and comprises a supporting box, wherein a supporting base is arranged at the lower end of the supporting box, a lower suction port is arranged at the lower end of the supporting box, a side suction port is arranged on the side surface of the supporting box, one end of the side suction port and one end of the lower suction port are connected with a turbine suction machine, a suction pipe is arranged at the other end of the turbine suction machine, a leak hole is formed in the outer wall of the upper end of the suction pipe, the leak hole is in a barrel structure, a filter plate is arranged on the outer wall of the leak hole, the filter plate is in a three-layer structure, a mounting slot is arranged at the lower end of the filter plate and is connected with a filter barrel, and the filter plate is in insertion installation with the filter barrel through the mounting slot. According to the technical scheme, the turbine suction machine is used for sucking oil mist, the multi-layer filter plate is used for filtering the oil mist, and meanwhile lubricating oil is collected. However, in the above technical scheme, because the turbine suction machine is used as a suction power source, additional electric power is needed, and meanwhile, the technical scheme has a complex structure and huge volume, and can be used on large-scale equipment such as a numerically controlled lathe, but cannot be installed on a bearing seat of a motor. Disclosure of Invention The invention aims to provide the ventilation device for preventing the oil in the bearing box from dripping, which can effectively solve the problems of oil mist escape and oil dripping of the bearing box of the motor, reduce the consumption of lubricating oil and has the advantages of exquisite structure and no need of external power supply cooperation. The invention adopts the following technical scheme: A ventilation device for preventing oil from dripping outside a bearing box comprises a shell with an inner cavity, wherein a cavity partition plate with a first gas discharge through hole is arranged in the shell, the cavity partition plate divides the inner cavity of the shell into a gas discharge cavity and an oil mist filtering cavity which are communicated up and down, an oil mist filtering mechanism for forming a spiral oil mist filtering channel is arranged in the oil mist filtering cavity, an oil mist guiding mechanism and a lubricating oil recovery mechanism are arranged at the lower end of the shell, the spiral oil mist filtering channel is communicated with the bearing box through the oil mist guiding mechanism and the lubricating oil recovery mechanism, and a second gas discharge through hole communicated with the outside is formed in the side wall of the gas discharge cavity. The oil mist filtering mechanism adopts a spiral filtering baffle plate, and a plurality of filtering net holes are arranged on the filtering baffle plate. The outlet of the oil mist introducing mechanism is arranged at the center of the spiral oil mist fil