High speed multistage centrifugal fan axis wear analysis at the site of the problem

This paper introduced a kind of speed of 2900 r/min Shi Bin Sally Spencer high-speed multistage centrifugal fan bearing wear of the process at the site, and stop for fan wear reason analysis, proposed the use f the blue & reg; Polymer composite materials with special tooling to stop the process at the site, repair after the completion of the continuous tracking, using the effect is good. 【 Keywords 】 The fan shaft wear; Fan; Bearing wear; Shi Binsha ( spencer） ； Site repair process; 1, the equipment introduced multistage centrifugal fan for multi-stage, single suction and double supporting structure, the rotor, chassis, air inlet, outlet, bearing, seal, muffler, motor and control system, etc ( See figure 1) ； Motor and blower device on the base, through the coupling between direct drive. Figure 1 - Multistage centrifugal fan structure 2, multistage centrifugal fan axis wear 2 at the site of the problem. 1 a multistage centrifugal fan axis wear a chemical company imported Shi Binsha ( spencer） Excessive vibration value showing in multistage centrifugal fan, the speed of 2900 r/min; Remove the discovery after thrust side rendering of the fan shaft wear problem, wear position for angular contact bearings and ball bearing assembly, wear for unilateral 0. About 25 mm, the diameter of axle is phi 65 mm; Angular contact bearing models for: 7313 wn/T313KS; Deep groove ball bearing models for: 7313 wn/P313KS. 2. 2 equipment problem analyzing axial present reason has a lot of wear and tear, but the main reason is used to make metal characteristics of the resolution of the shaft, metal is high hardness, but sex difference ( Cannot recover after a deformation) Poor, shock resistance, fatigue resistance is poor, and therefore easy to form the adhesive wear, abrasive wear, fatigue wear and fretting wear and so on, the big local axial wear problem is not easy to find, as long as the present machine high temperature, bouncing, such as sound, big local axis has been badly worn, thus forming machine downtime. 2. 3 multistage centrifugal fan site repair process 2 axis wear problem. 3. 1 for axial and inner hole wear traditional problems common USES is after removal to shaft repair workshop to stop repair welding, set shaft sleeve, such as disposal, repair welding machining process itself is easy to make the shaft part appearance produces thermal stress, form the hidden trouble of the broken shaft, repair welding and machining process needs spend a lot of manpower and time on the equipment stop to remove, transport, and mechanism, its repair for a long time, high comprehensive repair capital. 2. 3. 2 f the blue & reg; Polymer composite materials to repair process. Application of polymer composite materials with repair mold ( See figure 2) Worn parts to stop at the scene to repair, before have no use for progress repair precision mould, but in order to guarantee repair effect and precision for repair mold stopped the redesign, the maximum guarantee repair precision. Figure 2 - Mould processing in figure 2. 4 multistage centrifugal fan axis wear 2 at the site of the problem. 4. 1 appearance treatment: first will wear position stop baking oil disposal, remove oil seep into the metal microporous; 2. 4. 2 dozen pitting: to increase the material adhesion in 4 - axis weeks round Article 6 the pitting; 2. 4. Three grinding: use sand paper burnish of wear position to stop treatment, using alcohol or acetone to clean clean. 2. 4. 4 empty try mold: mold assembly to repair parts, see fit mould condition, and then remove the brush after demoulding agent standby; 2. 4. 4 to reconcile data: proportionally mixed 2211 f data and stir until there is no color difference on average. 2. 4. 5 daub data: using data of 2211 f will wear position filled and slightly bigger than the wear volume. 2. 4. Mold assembly, wait for material curing; 2. 4. 5 data curing after the completion of the mold removal, apply information bearing assembly again. 2. 5 multistage centrifugal fan shaft abrasion problem 3, endnotes at the site after the rotational speed of 2900 r/min Shi Bin Sally Spencer multistage centrifugal fan bearing wear field repair, is the blue & reg; The beneficial trial of the mold repair technology, broke before using the field repair mould only for low and middle speed device limitations. After this attempt, proved that the use of f the blue & reg; Polymer composite material collocation repair mold can very good processing equipment transmission parts wear problem, proves the f the blue & reg; Site repair process has high repair precision, good meet the precision request of equipment in the repair link control under the premise of accurate and traditional machining off-line repairing a piece.