Fuller pump discharge end bearing heat analysis and processing of knowledge - bearing

1. Improve air seal pressure, adjust the compression spring fuller pump in use, flapper valve need to constantly switch. The flapper valve is opened, that is, discharging, there will always be part of the conveying material of low pressure of compressed air into the discharge chamber. As a result of the cylinder section spiral longer, resistance is bigger, so this part of the compressed air is not easy to flee to the hopper. The only way out is through the discharge end bearing in front of a few aprons exhaust discharge in the direction of the bearing. When air seal pressure is low, can not resist the stream, it carries raw powder into bearing, bearing heating. In order to solve this problem, must increase the pressure of air seal and conveying material at least should be greater than the pressure of compressed air. In addition, for a few of the o-ring seal compression spring firmness must adjust moderately. Tight increased wear, bearing is easy to fever; Too loose, aprons will not seal effect, easy to make the raw powder into the bearing. 2. Activities bearing axial clearance must be guaranteed fuller pump generally longer, screw shaft with a diameter of 300 fuller pump as an example, the pump screw shaft length is 3155 mm, on both ends of the fulcrum distance according to 2800 mm, and shell temperature at 30 ℃, 40 ℃ and 50 ℃, then this screw axial thermal elongation are: 0. 950, 1. 266, 1. 582 mm. So much of the elongation, must have a in both ends of the bearing is bearing. According to the principle of design, general installation activities at the discharge end bearing, and must ensure that the axial clearance, otherwise will inevitably lead to bearing heating. Therefore, in the discharge end bearing outer cover and minimum should stay about 2 mm gap between bearing. 3. Bearing amount should be appropriate bearing refueling undeserved, can cause bearing heating. For the average rolling bearing with grease lubrication, should add 1/2 ~ 2/3 of oil bearing space volume. Too much grease, bearing heats up; Too little, can shorten the cycle, make frequent refueling cycle, second fever due to lack of grease. 【 The bearing network]