Thread Content
The main function of the bearing is to support the rotation of the rotor and reduce the friction coefficient of the mechanical load during the transmission process of the refrigeration equipment. In other words, with the bearing on the stator, the rotor can rotate and the motor can work. It can be seen that bearings play a decisive role in refrigeration units. Although bearings are powerful, once they malfunction, they will affect the refrigeration efficiency of the refrigeration unit. Therefore, the maintenance and repair of bearings is particularly important. What are the common faults and types of bearings and how to repair them? Gong Lenghui will explain them one by one below. 1. Common faults of bearings 1. Bearing temperature is too high. The reasons are: The quality of the lubricating oil does not meet the requirements or has deteriorated, the viscosity of the lubricating oil is too high, the clearance between the bearing and the compressor is insufficient or the assembly is too tight, the bearing race is rotating on the shaft or in the shell, the load is too large, etc. 2. The reasons for bearing abnormal noise are:: The surface of the bearing outer ring is worn, the bearing and shell are damaged, the gap between the bearing and the compressor is increased, foreign matter intrudes, insufficient lubrication, the shaft seal cage and seal cover are deformed, etc. 3. The reasons for bearing damage are:: Metal peeling off the rolling surface of the bearing, bearing burns, etc. 2. Bearing categories There are more than ten main categories of bearings, but the bearings used in refrigeration units mainly include radial bearings and thrust bearings. 1. Radial bearing The role of the radial bearing is to bear the weight of the rotor and other additional radial forces of the compressor, so that the rotation center of the rotor and the center of the compressor cylinder are consistent and operate normally at a certain speed. 2. Thrust bearing The function of the thrust bearing is to bear the axial force of the rotor, limit the axial movement of the rotor, and keep the axial position of the rotor in the compressor cylinder constant. 3. Bearing disassembly involves bearing maintenance. The most important thing is bearing disassembly. Next, Gong Lenghui will explain 4 methods of bearing disassembly.: 1. Hammer disassembly method: This method is a relatively simple disassembly method. This method only uses the power of hammering to displace the matching parts and separate from each other, thereby achieving the purpose of disassembly. This method is suitable for parts with simple equipment structures and solid parts. Not suitable for large refrigeration centrifugal compressors. Finally, in order to reduce friction when using this method, the bearing connections should be moistened with lubricating oil. 2. Mechanical method supplemented by hydraulic method. This method is suitable for tapered bore bearings. To disassemble relatively small bearings with adapter sleeves, use a stopper fastened to the shaft to support the inner ring. After turning the nut back several times, use a spacer block and hammer to disassemble it. It is easier to disassemble large bearings by using oil pressure. Oil is supplied under pressure to the oil hole on the tapered bore shaft to expand the inner ring to disassemble the bearing. During the process of disassembling the bearing with this method, there is a risk that the bearing may suddenly come out. It is best to use the nut as a stop. Hydraulic disassembly of tapered bore bearings using adapter sleeves and withdrawal sleeves. 3. Inner and outer ring disassembly method: Many engineers like to set several cuts on the housing shoulder during the process of dismantling the bearing, use spacers, use a press to disassemble, or gently tap to disassemble. 4. Pressure unloading and pulling unloading method This method has obvious advantages over the knocking unloading method. The specific performance is that the force is applied uniformly, the size and direction of the force are easy to control, larger parts can be disassembled, and damage to the parts can be effectively reduced. However, this method requires the use of corresponding machinery and tools, such as machine tools for pressure removal and grinding for pull removal. If possible, it is recommended to use this method to disassemble the bearing. The above are screw compressor bearing failures, classification and removal methods. Friends who are interested in bearing installation can comment and like, and we will publish an article in the next issue. Shandong Gonglenghui Network Information Technology Co., Ltd. is a company specializing in providing MRO services for industrial refrigeration equipment. Our company has more than 10 years of experience in debugging, maintenance, and overhaul of industrial refrigeration equipment, and has the ability to repair, overhaul, and debug. The current service brands mainly include York, GEA (Grasso), Wulin, Daleng, Yanlen, Carrier, Trane, and McQuay. At present, the "Gonglenghui" e-commerce platform, with a B2B + O2O model, can provide customers with more than 100,000 product accessories of the above refrigeration unit brands, such as lubricants and filters for daily maintenance, sensors, valves, controllers, electrical components, heat exchangers, compressors, control centers for maintenance, bearings, seals, shaft seals, rotors, slide valves, balance pistons, impellers and other parts for overhaul. We also provide customers with multi-faceted remote and on-site technical services, with the mission of "creating more value for customers through efficient supply chains and high-quality services in the field of industrial refrigeration" and the eternal goal of "making customers feel at ease and satisfied, creating value for customers". “"Gonglenghui" is now launching a highly cost-effective industrial refrigeration equipment solution package for customers who use industrial refrigeration equipment across the country.