Air conditioning used motor and the bearing

Use 2020 - air conditioning with motor and bearing 03 - 27 qi-bin li Liu Junli chi township ( Zhejiang beautiful hvac equipment co. , LTD. , zhejiang foshan 528311). Abstract: commonly used in the field of commercial, household air-conditioning polyhedral wind products, its structure characteristics for hoisting machine mixing, wind flow. And the hanging wall of the air conditioning and other products, the products of motor and the bearing assembly and related technical requirements higher. If the process is not good, it is easy to lead to reduce motor bearing life and quality decline, poor product quality. Therefore from the Angle of reliability, it is necessary to show the use of air conditioning and bearing analysis. Key words: bearing; Bearing different sound; 1 reason analysis. Technical background is more commonly used in the field of commercial, household air conditioning wind products ( As shown in figure 1) , the structure characteristics of hoisting machine mixing wind flow. And the hanging wall of the air conditioning and other products, the products of motor and the bearing assembly and related technical requirements higher. If the process is not good, it is easy to lead to reduce motor bearing life and quality decline, poor product quality. 2. Problem analysis in view of the installation method of this motor and bearing load are analyzed. First, define the pilot shaft end bearing for 1 # bearing; Short shaft end for 2 # bearing, as shown in figure 3. In 1 #, 2 # 2 sets of motor bearing due to wave plate elasticity and the rotor under the action of gravity, the direction of the force exerted on inner and outer bearing, as shown in figure 4. Drawn from the above products five motor disassembly analysis. For five rotor bearing feel with the hand on both ends its flexibility, found that the two sets of bearing has the same features, is the unilateral rotating have obvious hysteresis, and the other side is relatively good. 1 #, 2 # bearing in a plane stress rotates will have obvious feel bad, but feel is good, b side spin figure 5 below. By combining the motor bearing force direction, toward consistent with the stress direction of rotation will have obvious rotation is not smooth, and the reverse is more better. Preliminary think this is the bearing raceway and the possibility of dry friction between the steel ball. Will take off and technical parameters of the bearing test, the data in table 1 below. Can be seen from the table, inside diameter, outside diameter, bearing hardness indexes in the production process control. Has two sets of low fat injection rate, and clean the error. Bearing vibration level has become the Z1 group, the stress in the direction of a decibel value is higher than the other always ( Qualified products are Z4 group, decibel value & le; 27分贝) 。 From the above microscope magnified 63 times to inspect taken pictures to analysis: 1) Bearing oil than bearing 2 in 1 color is serious, this has certain relations with the motor structure. Because motor short shaft end cover is closed, the long shaft end cover some heat vent. This shows that electrical insulating paint drying enough internal residual acid gases will follow the vent out, so for the greatest influence to the long axis bearing 1, color also became more serious. 2) Inner ring raceway, the outer ring raceway and steel ball surface has serious micro wear trace. Every ball and raceway contact location have 2 ~ 3 points, this is because the rotation of the motor rotor has a few very minor, the entire race corresponding ball number eight in this kind of defect. 3. Comprehensive analysis of 3. 1 motor after loading the machine for a long time in a closed box, motor enameled wire on the residual insulating paint small acid can not get full discharge, easy to be absorbed by oil and grease produce hydrolysis reaction ( Formaldehyde + water molecules in a paint & rarr; Formic acid + grease & rarr; Hydrolysis & rarr; Corrosion) 。 Lead to change color, grease oil film thinning, impact resistance, and the indicators are reduced. 3. 2 electric captain time in static state, the bearing by wave type steel ball pin groove under the force, cause the steel ball and the raceway surface dry contact. The motor bearing grease is one of the characteristics of low noise, low viscosity, grease can't form good applying a film. And long-distance transportation of top wave vibration could be aggravated by the motion of the contact point between the wear and tear. So contact parts produced until the grinding marks, noise and therefore produce for motor work. 3. 3 lubrication can only be continuous in operation conditions to isolate anti-wear lubricant. Like sponge soaked with oil grease is need to force it to squeeze out the oil. And grease produced in the stationary state of oxidation faster than movement, the performance of the grease will impact. 4. Conclusion 4. 1 electrical insulating varnish choose performance more stable material, such as: the use of solvent-based varnish, does not contain the acidic component solvent varnish. Need to ensure that the stator drying time and dry process, and completely in ventilated place let harmful gas release at least 4 hours. Store inventory products must ensure that the internal state of ventilation and control temperature and humidity, make the residual harmful gases are fully discharge boxes. And the motor should not be parking time is too long. 4. 2 the bearing grease is mainly low noise, the oil film is very thin, the fretting wear resistance is not good. Suggestions according to the motor power and the use of different occasions, Such as commercial central air conditioning, household small central air conditioning, such as ark power force is different with different) As far as possible choose high viscosity, the oil film thick grease, so that bearing resistance to fretting wear will have improved greatly. 4. 3 motor assembly can even run after 3 ~ 5 minutes, makes the grease inside the bearing more evenly, to form a uniform film. 4. 4 the motor bearing axial preloading method and suggestion: = bearing radial rated maximum axial preloading static load * 2%. Source: the basic construction of 14, 2015