How to determine whether the amount of cooling water for the mechanical seal is appropriate?
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Everyone: What is the purpose of using cooling water for machine seals? To make rational use of the mechanical seal cooling water and reduce unnecessary waste, how can one determine whether the amount of cooling water is appropriate?
1. Although the high-pressure water inside the feed pump passes through the seals, it still retains some pressure. To prevent the water in the feed pump from leaking out through the gap between the shaft and the seals, water is supplied as seal water from the condensate pump outlet or the demineralized water main. 2. The water inside the feed pump is at a certain temperature, and the hot water transfers heat to the bearings through the pump’s shaft or the metal components of the pump, causing the bearing temperatures to rise. To prevent heat from escaping, the sealing water also serves a cooling function. 3. When the sealing water passes through the seal, a water film is formed between the shaft and the seal, preventing leakage from the gap between them and thus avoiding significant loss of working fluid ； At the same time, the high-temperature feed water transfers heat to the bearings through the pump shaft and the metal of the pump body, raising the temperature of the bearings. In severe cases, it can even cause the bearing to burn out ； The gap between the high-speed rotating shaft and the seal is very small; when the sealing water is lost, the water film in this area is disrupted, and friction between the shaft and the seal is likely to occur, resulting in increased vibration of the feed pump. In severe cases, this can lead to damage to the equipment. The return water of the seal water is generally introduced into the condenser through multi-stage water seal tubes. The principle of mechanical seal cooling: It involves using circulating softened water to carry away the frictional heat generated by the relative rotation of the moving and stationary rings, thereby reducing the operating temperature and extending the service life.
I think controlling the water outlet temperature is enough
What 3# said makes sense; we also control the outlet temperature of the cooling water for the mechanical seal, and it’s simple – a high temperature indicates that the water flow rate is low. You can just test it with your hand; a warm temperature is just right. :)
Control the outlet water temperature; it must not be higher than 60 degrees.
I’ve learned it; I wanted to ask this question a long time ago, but didn’t