For water pump motors, bearing rust is the most common event. If the problem of preventing bearing rust is also a problem that the pump motor customers want to know. The Chinese bearing network (abbreviated: Hua Bearing Network) through the analysis and summary of the bearing rust to understand the characteristics of the bearing rust, which leads to the cause of the bearing rust and the corresponding preventive countermeasures. Let's take a comprehensive understanding of this issue together.
First of all, the phenomenon and characteristics of the bearing paint rust:
Pain rust mainly appears on a closed motor or closed packaging to store the motor. This is mainly because the rust of closed motor rust is not easy to relax. The characteristics of paint rust are mainly in the following aspects:
1. Place of occurrence: Usually in the southern area of high temperature and high humidity and high humidity areas.
2. Time: Usually in the stuffy season, the percentage of motors that enter the warehouse in April, May, and June each year are the highest, because at this time, due to climate change after the motor is entered, it is very easy to appear.
3. Motor type: Usually a closed motor or closed storage.
4. The paint rust of the bearings has obvious direction. It is more serious about one end of the rotor than the other end. After picking out the sealing cover, you can smell a very strong paint. Sometimes the internal rust of the bearing is more serious than the outside.
5. The rusty bearing lubricating fat has a special paint rust, which is similar to the smell of insulating paint.
6. Most of the rust phenomenon occurs when the solvent type insulation paint is occurred, and sometimes the solvent -free paint is used (insufficient drying time).
Understanding: painting rust mechanism
The production of bearing rust is affected by the comprehensive factors of internal and external factors: The acid molecules of the insulating paint of the motor stator by the bearing rust of the motor are caused by the absorption of the lubrication and the moisture. It is related to the type of insulation paint, the drying process of the stator, and the storage environment of the motor. When using amino or phenol -based insulating paint, the molecular chain is extremely unstable during the hardening process. Such as formaldehyde, when the temperature and humidity are appropriate, formaldehyde reacts with water molecules in the weather to produce gem acid. Gy acid can hydrolyze lubricating fat and corrode the bearings to cause rust.
Using infrared lighting analyzers to analyze the rust rust smell. You can see that there is a peculiar absorbent line with paint rust, which is the same as the iron component (characteristic absorption peak). It can be considered as a rust caused by methic acid.
After understanding, the cause of Qiu Xiu
The factor induced by bearing rust refers to the tightness of the severity and humidity of the bearing paint rust during the rust test of the bearing paint. It is generally considered to be prone to paint rust in a 70%RH environment. Most paint rust occurs in the imagination of the annual rainy season of the south or the coast.
1. Climate environment: high temperature, high humidity
2. Insufficient stator drying;
3. The motor bearing is sealed in storage;
4. The severity of paint rust mainly depends on the component of the paint.
5. Prevention of paint rust (bearing seal and rust -proof, type of oil)
Third, understand the characteristics of the rust bearing:
The rusty bearing is generally on the inside of the motor, and the rust is severe. The fats near the edge of the inner and outer circles are first metamorphic, generally yellow -brown.
Finally, understand, bearing rust prevention countermeasure plan
In summary, the prevention of bearing rust must be considered in its mechanism, considering the motor design, manufacturing, insulation, and bearing. We will organize preventive measures as follows:
1. Avoid completely sealing, open the pores as much as possible;
2. Make Chinese medicine to ensure the drying time of insulating paint. It is best to place it in the ventilation of natural ventilation after the stator drying, so that the paint gas should be completely released.
3. During the storage process of the warehouse, do not tighten the walls and corners, and use a tray on the ground to ensure ventilation. The humidity should be as small as 70%RH as much as possible.
4. Use stable type insulating paint (such as epoxy -free insulation paint) with stable types of low molecular acid, and strictly produced according to the production process.
5. When selecting lubricating fat, lubricating fat based on mineral oil.
6. Use sealed bearing.