Under what conditions does a centrifugal pump need to cool bearings, mechanical seals, etc.?
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For example, at what temperature is the transmission medium required to use cooling water to cool the bearing? How long does it take to cool down the machine seal? Do different types of mechanical seals have different cooling conditions? I hope all sea friends can speak freely.
It depends on what kind of pump it is, what medium it transports, what kind of cooling is used, whether it uses external circulating water or its own medium for cooling, such as: The medium temperature of the liquefied gas return pump in my unit is 43-45 degrees Celsius. It must use its own medium to flush the machine seal for cooling, otherwise it will burn out the machine seal sealing ring and damage the machine seal.
The temperature of the oil transported in our factory is above 150 degrees, and the bearing box and machine seal are cooled by a water system. Once the cooling water inlet pipe was blocked and the machine seal burned. Therefore, the cooling water inspection of this type of pump must be strengthened.
When the centrifugal pump is running, it rotates at high speed, friction generates a lot of heat, and the temperature of the mechanical seal will be very high. Therefore, the centrifugal pump needs water to cool down and protect the seal.
It is related to the properties of the mechanical seal itself and the temperature of the material. Bearings generally receive little cooling.
This post was last edited by Ivory on 2009-5-23 16:28. The bearing temperature exceeds 80 and must be cooled.
If the medium temperature exceeds 80, it must be cooled.
The bearing temperature is required to be used below 90 degrees. As long as the temperature is not higher than this, water cooling is not required.
The conveying medium needs to be cooled at 100 degrees and the bearing needs to be cooled at 150 degrees.
Cooling the bearing box depends on the temperature of the bearing box. If it exceeds 75 degrees, it must be cooled. Generally, high-temperature pumps will use water jackets to cool the bearing box. Mechanical seal cooling depends on the medium and mechanical seal structure. The medium at the sealing surface is easily vaporized by the heat generated by the sealing surface, and the high-pressure and high-temperature medium is prone to produce a higher temperature for the seal. In these situations, the mechanical seal needs to be cooled. There are also different concepts of mechanical seal flushing and water jacket cooling.
When the medium temperature is between 120-175 degrees, you can consider setting up bearing cooling. When it exceeds 175 degrees, cooling must be set up. There are two main considerations for mechanical seal cooling.: Medium vaporization, use temperature of non-metallic materials.
As long as the pump is rotating, it must be cooled, and the frictional heating temperature is not low, no matter what the medium is.
What the 13th floor said makes sense. They should all be cooled. The difference is the cooling medium and method.: Self-cooling, external cooling water cooling, etc. Hahaha, personal opinion.