Analysis and Measures of High Temperature of Pump Crankcase
1. Problem The ammonia recovery unit in the ammonia plant is equipped with two high-pressure washer pumps 10P001A / B, manufactured by F. PERONI, model TITANO31.20, horizontal three-cylinder piston pump driven by a 22kW motor and equipped with a gear reduction box. Crankcase with constant oil level splash lubrication, wear gear wear gear N1L 14L. Since the pump has been put into use, parts and components such as bushings life cycle of about 18 months. Due to domestic parts ordering cycle is short, the price is low. Overhaul, connecting rod large, small tiles, pins, etc. made use of domestic parts. Pump normal operation temperature should be about 45 ℃, but the temperature rose to 80 ℃ after 10h, and the temperature rise faster and faster. Open the crankcase inspection found that the bottom of the deposition of a large number of alloy fragments and debris. Crosshead head tile wear serious, some have been worn. Pin also grind out annular deep groove. The bulk of the tile part of the alloy due to wear overheating and honeycomb shedding, the crankshaft journal has a large number of padded alloy, and the surface roughness. 2. Analysis of the causes of defects in the structure and materials of parts: the head tile, cross-head dowel tile is a bimetallic thin wall tile, the inner wall of the alloy is uneven, wear resistance is poor, the working surface is easy to wear or dissolve off; domestic crosshead head tile and Original comparison, no openings, lack of elasticity and tension. With the opening of the head tile shrink, into the cross head expansion can be assembled tight. No openings in the head tile interference will appear small run circle phenomenon, that is, bush rotation, wear faster, although the lock can be coated with glue, but the effect is not good when the oil temperature is slightly higher. On the contrary, a large amount of interference, shrinkage after loading closed, the pin is not easy to load. Pin surface hardness is low, not wear-resistant. The bulk steel shell elasticity is poor, low strength, positioning slot angle is inappropriate, the lack of edges and corners, can not be well with the connecting rod bore expansion and positioning, and sometimes appear laps phenomenon. Poor lubrication: due to the crankshaft journal wear and slightly oval. The original splash lubrication, due to splash lubrication filter, impurities in the lubricating oil and wear of metal scrap can not be filtered, while the oil itself is not pressurized and the cat is higher, likely to cause oil plugging, the pump Fever and wear increased. 3. Improvements In addition to improving accessories, with emphasis on improving lubrication conditions. Crankcase splash lubrication will be forced lubrication, pump inlet plus a filter. Both ends of the crankshaft roller bearings normal oil level, you can still use splash lubrication. After the improvement, the lubricating oil pressure is 0.02MPa, and the oil temperature is stable at 45 ℃ for a long time in summer. 4. The use of friction surface regeneration technology "Mount St." is a metal friction surface regenerating agent, when it reaches the metal friction surface of the equipment, the metal surface superfine grinding, in the process to complete the surface cleaning, while " "Mount St." particles will be further refined; at the local contact point of the ultra-high pressure, the "Mount St." particles "fusion" to the metal layer lattice, improving the metal layer of the crystal structure in the microscopic low depression Occurrence of "Mount St." particles, metal particles and other synthetic substances involved in the hardening effect. Crankcase use "Mount St." technology, the summer high temperature crankcase temperature around 46 ℃. After 14 months of cumulative operation of the pump, disassembly was carried out and the surfaces of all the friction surfaces were in good condition. In particular, the bulk of the tile had a very smooth and smooth surface without any flaking and scratching and was even more dense than the new tile. Pump running for nearly two years, in good condition.
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