Refrigerant gas R406A is a mixture of three components
chlorodifluoromethane (R-22), isobutane (R-600a) and
chlorodifluoroethane (R-142b) in the ratio 55/4/41. This refrigerant was designed as a drop-in replacement for R-12 which is
compatible with the typical mineral oil lubricants used in R-12
systems. Since it is a zeotropic mixture, it has a range of boiling
points which may increase the effectiveness of the heat transfer
elements in refrigeration equipment.
R406A Refrigerant Gas,R12 Replacement Gas,R406A Replacement Gas ZHEJIANG ZHONGLAN REFRIGERATION TECHNOLOGY CO.,LTD , http://www.uiszl.com
When disassembling the lower bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and clean the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash. Fine washing is to carefully clean the bearing while rotating it in the cleaning solution. In addition, the cleaning oil should always be kept clean.
2. Inspection and judgment of bearings
In order to judge whether the removed bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance and whether there is dimensional accuracy. Falling damage, abnormality. For non-separable small ball bearings, use one hand to support the inner ring horizontally, and turn the outer ring to confirm whether it is in a smooth rotation state.
Separate bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.
Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance, the more careful inspection is required.
The judgment of whether or not to reuse is determined in consideration of the degree of bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if the following defects are not available, the new bearing must be replaced:
(a) cracks or notches on any of the inner ring, the outer ring, the rolling elements, and the cage;
(b) a break in any of the ferrule and the rolling element;
(c) significant jamming on the raceway surface, ribs and rolling elements;
(d) The cage is worn significantly or the rivet is significantly slack;
(e) rust and injury on the raceway surface and rolling elements;
(f) There are severe indentations and marks on the raceway surface and the rolling elements;
(g) The inner diameter of the inner ring or the outer diameter of the outer ring has obvious creep;
(h) discoloration due to heat;
(i) Bearings sealed with grease, the seal or dust cover is damaged.
Bearing cleaning and repair and judgment
1, the cleaning of the bearing