Abstract: Ice machine is a device that uses the easy compressibility and liquefaction of ammonia gas for refrigeration, commonly used in the chemical and pharmaceutical fields. This article carefully studies and analyzes the causes of oil leakage in the bearing oil seal of the chemical ice machine motor, proposes improvement measures for related problems, and redesigns the oil hole and oil nest. After inspecting the redesigned ice machine oil seal, it was found that the fault of abnormal oil leakage has been eliminated, and the equipment is currently running well without any related problems of oil leakage from the ice machine bearing oil seal.
Keywords: ice machine; Oil seal; bearing bush
Anhui Jinmei Zhongneng Chemical Co., Ltd. currently has a total of eight such oil seals in the synthesis position, all of which have experienced varying degrees of oil leakage. Among them, the 1 # ice machine is more serious and has been returned to the manufacturer for handling the issue, but it has not been effectively resolved. So Zhongneng Chemical Co., Ltd. proposes that the pursuit of perfection starts with small improvements. By continuously improving the effectiveness of the quality system operation, actively carrying out technological innovation, and continuously enhancing the level of business technology. The maintenance workshop proposes to continuously improve the level of equipment maintenance by adopting new technologies, materials, and methods, ensuring long-term safe, environmentally friendly, and stable operation of equipment. We will tackle the safety, environmental protection, and waste of human and material resources caused by oil leakage from the bearing oil seal of the synthetic ice machine motor.
1 Cause analysis
Through in-depth practical analysis, the following factors have been identified:
1.1 There is a defect in the static seal, and there is no sealing element between the sealing groove end face and the motor front end cover.
1.2 The oil seal has poor sealing and oil discharge capacity.
1.3 The oil drain groove inside the sealing groove is shallow and narrow.
2 Develop countermeasures
1. Install a sealing tape, O-ring, and sealant between the sealing groove end face and the motor end cover.
2. Adjust the spring elasticity and increase the diameter of the oil discharge hole of the sealing ring.
3. Widen and deepen the oil leakage groove.
4. Improve the design defects of the bearing oil seal and oil seal seat.
3 Implementation of countermeasures
Implementation 1: 1. All static sealing points, such as between the upper and lower end covers of the bearing base, between the bearing base and the sealing groove end face, and between the sealing groove end face and the front end cover of the motor, shall be equipped with sealing tape, O-ring, and sealant.
Figure 1: Between the upper and lower end covers of the bearing base, between the bearing base and the sealing groove end face, and between the sealing groove end face and the motor front end cover.
Implementation 2:
Modification of sealing ring: Adjust the spring elasticity, increase the oil discharge volume, and increase the diameter of the oil discharge hole of the sealing ring from 3mm to 5mm without affecting the strength.
Figure 2: The sealing ring
Implement 3:
Widen and deepen the oil leakage groove, and leave a certain slope for the oil discharge groove.
Figure 3: Oil leakage groove
4 Effect check
Effectively improved the problem of bearing oil leakage. Half a year without refueling. But there has been another oil leak in the past two months, with oil refilling every two weeks. My group has decided to conduct a PDCA cycle.
5 Effect comparison
Through the improvement of the vibrating screen, there has been no looseness or looseness of the screen plate, greatly extending the operating cycle of the vibrating screen, reducing maintenance frequency, and minimizing maintenance workload. The screen plate at the discharge port is intact without wear. The screening effect is very good, fully meeting the process requirements for the particle size of the raw coal entering the furnace.
6 Benefit analysis
1. Direct benefits
Add 10kg twice per class. 60kg per day, 300 days a year, 106 barrels of oil per year! 106 × 2100=220000 yuan.
2. Indirect benefits
Avoid repetitive work and avoid parking due to equipment failure. The equipment operates safely and stably for a long period of time, providing protection for safe production. No leakage of equipment contributes to the construction of a safe and civilized factory.
7 Summary
Innovation is endless and ubiquitous. Through this event, the ability of all staff to assist has been exercised, which not only ensures the long-term safe and stable operation of the equipment in this position, but also saves manpower and financial resources. At the same time, it also improved the professional skills of team members, contributing to the early realization of Zhongneng's "Three Hundred" vision.
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