1、What is the reason for sudden bearing damage during fan operation?

1. When installing bearings, use brute force and directly hit the bearings with a hammer to cause the greatest damage to the bearings; It is the main cause of deformation.

2. Inadequate installation, installation deviation or failure to install in the bearing position, resulting in too small bearing clearance. The inner and outer rings are not at the same center of rotation, resulting in non concentricity.

2、Fatigue (approximately 34%)

Fatigue failure is a common mode of bearing damage. The common causes of fatigue failure may be: long-term overload operation of bearings; Failure to repair in a timely manner; Improper maintenance; Equipment aging, etc.

3、Pollution (approximately 14%)

Pollution can also lead to premature bearing damage, which refers to the entry of sand, dust, metal shavings, etc. into the interior of the bearing. The main reasons include: opening the bearing packaging too early before use, causing pollution; The working environment during installation is not clean, causing pollution; The working environment of bearings is not clean, and the working medium is contaminated.

2、Symptoms and hazards of bearing damage?

The symptom is that the equipment is not as flexible as usual, and the danger is that it may be damaged along with other parts. Therefore, if the bearing is damaged, do not make do with it, as you are damaging the entire equipment!

3、 How to determine the cause of bearing failure and damage?

Bearing is an indispensable part of some Machine element and also plays a very important role. Bearing is widely used in real industry and is called "the joint of machine". It is also an important transmission part necessary for machines that need to bear axial force, radial force and overturning torque at the same time. Based on the damage situation of the bearing, the main reasons for determining the fault and damage of the bearing are as follows:

1. Metal peeling on the surface of the raceway

The rolling element of the bearing and the inner and outer race surfaces are subjected to periodic pulsating loads, resulting in periodic contact stresses. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the working surface of the rolling element or inner and outer ring raceways. If the load on the bearing is too large, it will exacerbate this fatigue. In addition, improper installation of bearings and bending of shafts can also cause peeling of the raceway. The fatigue peeling of the bearing raceway can reduce the operating accuracy of the shaft, causing vibration and noise in the mechanism.

2. Bearing burns

Burned bearings have a backfire color on their raceways and rolling bodies. The causes of burns are generally insufficient lubrication, unsatisfactory or deteriorated lubricating oil quality, and tight bearing assembly.

3. Plastic deformation

Uneven pits appear on the contact surface between the raceway and roller of the bearing, indicating plastic deformation of the bearing. The reason is that under significant static or impact loads, the local stress on the working surface of the bearing exceeds the yield limit of the material, which generally occurs on bearings that rotate at low speeds.

4. Cracks in the bearing race

The causes of cracks in the bearing race may be due to tight bearing fit, looseness of the outer or inner ring of the bearing, deformation of the bearing envelope, and poor surface machining of the installed bearing.

5. Cage broken

The reason is insufficient lubrication, broken rolling elements, and skewed seat rings. The possible reason for the metal adhesion of the cage to the rolling element may be due to the rolling being stuck in the cage or insufficient lubrication. Severe wear on the raceway of the seat ring may be due to foreign objects falling into the seat ring, insufficient lubricating oil, or improper lubricating oil grade.

4、 What is the symptom of compressor bearing failure?

The manifestation of compressor bearing damage is the rustling sound produced when the engine belt pulley drives the air conditioning compressor belt pulley to rotate without turning on the air conditioning switch. When the electromagnetic clutch of the air conditioning switch is turned on, the sound disappears.

The louder the sound emitted by the bearing, the more severe the damage. If it is very loud, there are only two solutions. One is to replace it with a new one; Another solution is to remove the air conditioning belt and not use it temporarily, as removing the air conditioning belt will not affect other uses; Otherwise, once the bearing locks, it will damage the belt or other components.

In the same way, what are the main faults of the bearing of the Computer fan? Why does this happen?

1、 Severe vibration of the bearing box of the cooling fan

1. The fan shaft and motor shaft are not concentric, and the coupling is installed askew

2. Friction between casing or inlet and outlet fan and impeller

3. The stiffness of the foundation is not firm

4. Loose rivets or deformation of fan impeller

5. Loose impeller shaft plate and shaft, or loose coupling bolts

6. Loose connecting bolts between the casing and bracket, bearing box and bracket, bearing box cover and seat, etc

7. Poor installation of the inlet and outlet pipelines of the cooling fan

8. Unbalanced rotor, worn blades of induced draft fan

2、 Excessive bearing temperature rise

1. Severe vibration of bearing box

2. The quality of lubricating grease is not bright, deteriorates, and contains excessive dust, sand, dirt, and other impurities

3. The tightening force of the connecting bolts of the bearing housing cover and seat is too large or too small

4. The installation of the shaft and rolling bearing is skewed, and the front and rear bearings are not concentric

5. Damaged rolling bearing