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Lubrication Fundamentals 2011 Part 8

Tham khảo tài liệu 'lubrication fundamentals 2011 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Figure 9.13 Pressure-feed circulation system for horizontal duplex two-stage compressor cutaway view through the main and crankpin bearings of the right-hand frame. The spiral gear oil pump draws oil from the reservoir through a strainer and forces it through a fine mesh screen and the hollow pump arm to the crankpin bearing. Excess oil is bypassed to the reservoir through a relief valve not shown . From the crankpin bearing oil flows under pressure through internal passages to the main bearing to the crosshead pin bearing and crosshead guides. 2. Systems employing a multicompartment tank combining reservoir and purification facilities Figure 9.14 3. Systems comprising an assembly of individual units reservoir oil cooler oil heater oil pumps purification equipment etc. The system illustrated in Figure 9.15 is fairly typical of the third type. Returning oil drains to a settling compartment entering the reservoir at or just above the oil level. Water and heavy contaminants settle and the sloping bottom of the reservoir helps to concentrate these impurities at a low point from which they can be drained. Partially purified oil overflows a baffle to the clean oil compartment. In some systems especially where large reservoirs are used baffles may be omitted. The clean oil pump takes oil usually through a suction strainer and pumps it to a cooler optional oil filter and then to bearings gears and other lubricated parts. The pressure desired in the oil supply piping is maintained by means of a relief valve which discharges to the reservoir at a point below the oil level. A continuous bypass purification system is shown. The pump takes 5-15 of the oil in circulation from a point above the maximum level of separated water in the reservoir and pumps it through a suitable filter back to the clean oil compartment. The following discussion of good practices in circulation system design refers primarily to systems of this type but the ideas presented are fundamental to most .