The starting current of the Imperial canned pump is too high until it is overloaded and shut down.
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Dear friends, our company has an Imperial canned electric pump (model R82-616J4BM-0810V1-K) that has been in use for 7/8 years. Recently, there have been continuous overcurrents at startup, and the current has become larger and larger until it shuts down due to overload. The disassembly and inspection revealed that the impeller end graphite bearing, bushing, and inference disk were all worn, and the impeller end face and the radial position of the inducer were also greatly worn (the pump has been damaged more frequently in the past 1 or 2 years, and the impeller and inducer have been worn many times before). The components on the other end show no obvious signs of wear. Obviously this is caused by an unbalanced axial force and excessive axial force on the impeller end. The most recent maintenance included replacing damaged parts and readjusting the axial clearance and axial displacement, but there was still no obvious effect, and an overcurrent fault still occurred when the machine was turned on. Could the wear of the impeller and inducer be a cause of this failure? The axial clearance of the rotor is adjusted to 6, and the serial amount is adjusted to more than 2. Is this data within a reasonable range? What is the most likely cause of this failure?
There are many reasons why this happens in a canned pump. What is the medium of this pump, the density and temperature of the medium, the inlet and outlet pressure, whether the medium is clean, how to exhaust before starting the pump, whether the gas has been exhausted, whether the gas phase line is clear, whether the steering is reversed, whether it is a variable frequency or a power frequency, or a soft start, what is the start delay, whether the pump has been stopped multiple times in a month, how much the g value has been adjusted, whether the channeling is 2.1 or 2.9, and where the axial clearance of the rotor refers. First, there is a problem with the axial force balance, then the thrust plate wears, the graphite bearing wears, and then the impeller mouth ring and the induction wheel wear. If there is wear, the current will change. The greater the current, the greater the load on the pump or the greater the friction resistance the rotor will experience.
Check the import pipeline: Is the resistance greater than before, that is, the inlet pressure is lower than before?
Is it mainly a problem with the gap between the mouth rings? Whenever there is wear on our Imperial pump, it is basically wear on the impeller end. The impeller mouth ring and inducer of this pump have been worn several times.
That's the reason. The gap between the orifice ring is too large and the axial force cannot be automatically balanced. Replace the impeller and front FB end cover. No other adjustments are needed.
The reason for the large current is undoubtedly the large resistance. For example, when a fan is rotating, if you put a stick between the fan blades to prevent it from rotating, the current will reach the maximum, which is very dangerous.
Hello, does this model of pump have automatic balancing? I consulted a repair shop in Dalian Lushun, and he said that they are generally non-automatic balancing types.
Yes, the last digit (K) in the model number is an automatic balancing type.
Thanks. I would like to ask if the adjustment of the axial clearance of the automatic balancing type is the gap between the impeller and the end cover after the impeller is pushed inward minus the height of the boss?
Not much has changed except for the medium.