Negative pressure system for eliminating oil leakage of bearing bush of high-power motor and use method

Abstract

The invention belongs to the technical field of motors, and provides a negative pressure system for eliminating oil leakage of a bearing bush of a high-power motor and a use method.The negative pressure system comprises a control power box, an electric oil mist pumping fan, an oil-gas separator, an oil storage cup, an air channel pipeline and a manual valve, an air outlet of the electric oil mist pumping fan is connected with a motor driving side balance air channel air inlet and a motor free side balance air channel air inlet through air channel pipelines, and a motor driving side balance air channel air outlet and a motor free side balance air channel air outlet are connected with the oil-gas separator through air channel pipelines. An oil path of the oil-gas separator is connected with the oil storage cup, and a gas path of the oil-gas separator is connected with an air inlet of the electric oil mist pumping fan; according to the system, airflow of an air channel pipeline and an airflow balancing cavity of a motor bearing bush form a convection channel through an electric oil mist pumping fan, oil mist flowing into the motor through a cavity air gap is reduced, and oil dirt mist is effectively prevented from adhering to the surface of a coil; and oil mist and dust in air are prevented from eroding coil insulation and influencing main insulation of the motor coil.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric motors, and relates to the oil mist leakage of the bearing bush of an electric motor. Specifically, it is a system and method for eliminating the oil leakage of the bearing bush of a high-power electric motor. Background Art

[0002] The blast furnace blower motor in an iron and steel plant usually uses a high-power high-voltage electric motor; for the sealing of the bearing bush cavity of the electric motor, a skeleton oil seal is a hard-sealed oil seal made of resin material to form a seal with the main shaft; during the production process, oil leakage of varying degrees often occurs. During maintenance, usually the skeleton oil seal and the spring ring are replaced, and the cotton and linen packing seal strip of the outer retaining wall of the bearing wall is replaced with a rubber strip seal; although the condition of oil leakage has decreased in this way, there is still leakage; then by adjusting the negative pressure of the oil mist blower in the lubricating oil station, reducing the negative pressure in the upper cavity of the oil tank, and reducing the impact of the vaporized foam oil mist on the wall retaining wall seal, the effect is still not very good, and there is still oil dripping and leakage around the bearing bushes on the driving side and the free side of the motor. Years of oil leakage is not conducive to the operation and management of high-power electric motors on site, and more importantly, it brings potential safety hazards to the operation of the electromagnetic coils of high-voltage electric motors. Summary of the Invention

[0003] The purpose of the present invention is to provide a negative pressure system and a usage method for eliminating the oil leakage of the bearing bush of a high-power electric motor, and solve the problem of oil leakage of the bearing bush of a high-power electric motor.

[0004] The technical solution adopted by the present invention to achieve the above purpose is as follows: A negative pressure system for eliminating the oil leakage of the bearing bush of a high-power electric motor includes: a control power supply box, an electric oil mist blower, an oil-gas separator, an oil storage cup, an air duct pipeline and a manual valve. The control power supply box is interlocked with the operating signals of the electric oil mist blower and the motor oil pump of the main process system. The air outlet of the electric oil mist blower is respectively connected to the air inlet of the balance air duct on the driving side of the motor and the air inlet of the balance air duct on the free side of the motor through the air duct pipeline. The air outlet of the balance air duct on the driving side of the motor and the air outlet of the balance air duct on the free side of the motor are respectively connected to the oil-gas separator through the air duct pipeline. The oil circuit of the oil-gas separator is connected to the oil storage cup, and the gas circuit of the oil-gas separator is connected to the air inlet of the electric oil mist blower.

[0005] Further, the manual valve includes an air exhaust and pressure regulating manual valve arranged on the air duct pipeline at the air outlet of the electric oil mist blower, a positive pressure regulating manual valve on the driving side arranged on the air duct pipeline at the air inlet of the balance air duct on the driving side of the motor, a positive pressure regulating manual valve on the free side arranged on the air duct pipeline at the air inlet of the balance air duct on the free side of the motor, a negative pressure regulating manual valve on the driving side arranged on the air duct pipeline at the air outlet of the balance air duct on the driving side of the motor, a negative pressure regulating manual valve on the free side arranged on the air outlet of the balance air duct on the free side of the motor, and a total negative pressure regulating manual valve arranged at the air inlet of the oil-gas separator.

[0006] Furthermore, the air inlet of the balance air duct on the motor drive side, the air inlet of the balance air duct on the motor free side, the air outlet of the balance air duct on the motor drive side, and the air outlet of the balance air duct on the motor free side are respectively connected to the air duct pipeline by using a spiral tube PVC pipe.

[0007] A method for using a negative pressure system to eliminate oil leakage from the bearing of a high-power motor includes: S1. Use an electric oil and mist extractor fan to form a convection channel for the air flow between the air duct pipeline and the balance air flow cavity of the motor bearing, and balance the air flow pressure in the breathing equalization cavity of the motor bearing slightly higher than the air flow in the internal cooling air duct cycle of the motor. S2. The high-velocity air flow of the electric oil and mist extractor fan extracts the oil mist-like gas-liquid at the labyrinth oil seal between the circular ring skeleton oil seal and the main shaft. S3. The oily mist gas-liquid is filtered and separated by an oil-gas separator, the oil flows into the oil storage cup, and the gas is discharged through the air duct pipeline. S4. Regularly return the oil collected in the oil storage cup to the oil barrel manually.

[0008] Furthermore, the start and stop of the electric oil and mist extractor fan are set with manual control start and stop and automatic interlock control start and stop.

[0009] Furthermore, the automatic interlock control start and stop adopts the interlock of the electric oil and mist extractor fan and the operation signal of the oil pump, and the electric oil and mist extractor fan is automatically started after the oil pump is started.

[0010] Furthermore, the electric oil and mist extractor fan is provided with overload alarm, open circuit alarm; fault short circuit grounding; trip protection.

[0011] The beneficial effects of the present invention are: In this system, the electric oil and mist extractor fan forms a convection channel for the air flow between the air duct pipeline and the balance air flow cavity of the motor bearing, reduces the oil mist from flowing into the motor interior through the cavity air gap, effectively blocks the adhesion of oil mist and dirt to the coil surface; avoids the erosion of the coil insulation by the oil mist and dust in the air, and affects the main insulation of the motor coil. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the system of the present invention; In the figure, 1 is the control power box; 2 is the electric oil extraction mist blower; 3 is the oil-gas separator; 4 is the oil storage cup; 5 is the motor driving side; 6 is the motor free side; 7-1 is the manual valve for air exhaust adjustment of wind pressure; 7-2 is the manual valve for positive pressure adjustment on the driving side; 7-3 is the manual valve for positive pressure adjustment on the free side; 7-4 is the manual valve for negative pressure adjustment on the driving side; 7-5 is the manual valve for negative pressure adjustment on the free side; 7-6 is the manual valve for total negative pressure adjustment; 8 is the semicircular skeleton oil seal; 9 is the main shaft of the motor; 10 is the coaxial annular airway balancing cavity of the motor bearing balancing airway; 11 is the plane diagram of the circulating airflow in the cooling airway inside the motor. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings: A negative pressure system for eliminating oil leakage from the bearing of a high-power motor, such as Figure 1 As shown, it includes: controlling an AOC power box 1, an electric oil extraction mist fan 2, an oil-gas separator 3, an oil storage cup 4, an airway pipeline and a manual valve, controlling the operation signal interlocking of the power box 1 with the electric oil extraction mist fan 2 and the electric motor oil pump of the main process system, the air outlet of the electric oil extraction mist fan 2 is respectively connected to the motor drive side balanced airway air inlet 5-1 of the motor drive side 5 and the motor free side balanced airway air inlet 6-1 of the motor free side 6 through the airway pipeline; the motor drive side balanced airway air outlet 5-2 of the motor drive side 5 and the motor free side balanced airway air outlet 6-2 of the motor free side 6 are respectively connected to the oil-gas separator 3 through the airway pipeline, the oil circuit of the oil-gas separator 3 is connected to the oil storage cup 4, and the air circuit of the oil-gas separator 3 is connected to the air inlet of the electric oil extraction mist fan 2.

[0014] Among them, the manual valve includes an air exhaust and pressure regulating manual valve 7-1 arranged on the air outlet air duct pipeline of the electric oil extraction mist blower 2, a driving side positive pressure regulating manual valve 7-2 arranged on the air duct pipeline of the balanced air duct inlet 5-1 on the driving side of the motor, a free side positive pressure regulating manual valve 7-3 arranged on the air duct pipeline of the balanced air duct inlet 6-1 on the free side of the motor, a driving side negative pressure regulating manual valve 7-4 arranged on the air duct pipeline of the balanced air duct outlet 5-2 on the driving side of the motor, a free side negative pressure regulating manual valve 7-5 arranged on the free side negative pressure regulating manual valve 7-6 arranged on the air inlet of the balanced air duct on the free side of the motor, and a negative pressure total regulating manual valve 7-6 arranged on the air inlet of the oil-gas separator 3.

[0015] Among them, the balanced air duct air inlet 5-1 on the motor driving side, the balanced air duct air inlet 6-1 on the motor free side, the balanced air duct air outlet 5-2 on the motor driving side, and the balanced air duct air outlet 6-2 on the motor free side are respectively connected to the air duct pipeline using spring tube PVC tube.

[0016] A method for using a negative pressure system for eliminating oil leakage from a high-power motor bearing comprises: S1. Use the electric oil-extracting mist blower 2 to form a convection channel for the air flow between the airway pipeline and the balance air flow cavities of the motor drive-side bearing 5 and the motor free-side bearing 6, and balance the air flow pressure in the motor bearing balance airway coaxial annular airway balance cavity 10 slightly higher than the circulating air flow 11 in the internal cooling air duct of the motor; S2. The high-velocity air flow of the electric oil-extracting mist blower 2 extracts the oil mist-like gas-liquid at the labyrinth oil seal between the circular ring frame oil seal 8 and the main shaft 9; S3. The oil-like mist gas-liquid is filtered and separated by the oil-gas separator 3, the oil flows into the oil storage cup 4, and the gas is discharged through the airway pipeline; S4. Regularly put the oil collected in the oil storage cup 4 back into the oil barrel manually; The start and stop of the electric oil-extracting mist blower 2 are set with manual control start and stop and automatic interlock control start and stop. The automatic interlock control start and stop adopts the interlock of the electric oil-extracting mist blower 2 with the operation signal of the main process system motor oil pump. After the main process system motor oil pump is started, the electric oil-extracting mist blower 2 is automatically started. The electric oil-extracting mist blower 2 is provided with functions such as overload alarm, open circuit alarm, fault short circuit grounding, and trip protection.

Claims

1. A negative pressure system for eliminating oil leakage from a high-power motor bearing, characterized in that: include: Control the power supply box, electric oil extraction mist fan, oil-gas separator, oil storage cup, air duct pipeline and manual valve; control the operation signal interlocking of the power supply box, electric oil extraction mist fan and main process system electric motor oil pump; the air outlet of the electric oil extraction mist fan is connected to the balanced air duct inlet on the motor drive side and the balanced air duct inlet on the motor free side through the air duct pipeline respectively; the balanced air duct outlet on the motor drive side and the balanced air duct outlet on the motor free side are connected to the oil-gas separator through the air duct pipeline respectively; the oil circuit of the oil-gas separator is connected to the oil storage cup; the air circuit of the oil-gas separator is connected to the air inlet of the electric oil extraction mist fan.

2. A negative pressure system for eliminating oil leakage from a high-power motor bearing according to claim 1, characterized in that: The manual valve includes an air exhaust and pressure regulating manual valve arranged on the air outlet air duct pipeline of the electric oil extraction mist blower, a driving side positive pressure regulating manual valve arranged on the air inlet air duct pipeline of the balanced air duct on the driving side of the motor, a free side positive pressure regulating manual valve arranged on the air inlet air duct pipeline of the balanced air duct on the free side of the motor, a driving side negative pressure regulating manual valve arranged on the air outlet air duct pipeline of the balanced air duct on the driving side of the motor, a free side negative pressure regulating manual valve arranged on the air outlet of the balanced air duct on the free side of the motor, and a negative pressure total regulating manual valve arranged on the air inlet of the oil-gas separator.

3. A negative pressure system for eliminating oil leakage from a high-power motor bearing according to claim 1, characterized in that: The motor driving side balanced air duct air inlet, the motor free side balanced air duct air inlet, the motor driving side balanced air duct air outlet, and the motor free side balanced air duct air outlet are respectively connected to the air duct pipeline using a spring tube PVC tube.

4. A method for using a negative pressure system to eliminate oil leakage from a high-power motor bearing, characterized in that: include: S1. Use an electric oil extraction mist blower to form a convection channel between the airway pipeline and the airflow in the balanced airflow cavity of the motor bearing, and balance the airflow pressure in the motor bearing breathing balanced cavity to be slightly higher than the airflow circulating in the cooling air duct inside the motor; S2, the high velocity airflow of the electric oil mist blower extracts the oil mist gas and liquid from the labyrinth oil seal between the annular skeleton oil seal and the main shaft; S3, the oily mist liquid is filtered and separated by the oil-gas separator, the oil flows into the oil storage cup, and the gas is discharged through the airway pipeline; S4. Regularly put the oil collected in the oil storage cup back into the oil barrel manually.

5. The method for using a negative pressure system for eliminating oil leakage from a high-power motor bearing according to claim 4, characterized in that: The start and stop of the electric oil extraction mist blower are set to be manually controlled and automatically interlocked.

6. The method for using a negative pressure system for eliminating oil leakage from a high-power motor bearing according to claim 5, characterized in that: The automatic interlocking control start and stop adopts the interlocking of the electric oil extraction mist fan and the oil pump operation signal, and the electric oil extraction mist fan is automatically started after the oil pump is turned on.

7. The method for using a negative pressure system for eliminating oil leakage from a high-power motor bearing according to claim 4, characterized in that: The electric oil extraction mist fan is provided with control box pressure loss, overload alarm, circuit break alarm, fault short circuit grounding tripping protection; and is interlocked with the main process oil station circulation pump to achieve green energy saving.

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