Double support pump thermal expansion
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The rear end of the double-support pump is positioned, the temperature is 300 degrees, the shaft length is 1500MM, what is the thermal elongation of the shaft. The opposite wheel is a diaphragm coupling with a gap of 0.4MM. Will the shaft extension push the diaphragm of the opposite wheel to death?
The mounting hole of the high-temperature pump body should be fixed at the driving end, and the non-driving end should be a long hole for thermal expansion. Only the shaft temperature between the two end seals of the pump shaft is close to 300 degrees, and the shaft temperature of the bearing box is not large. These aspects will be taken into consideration when making high-temperature pumps. If the non-driven end is not the free end for thermal expansion, then it needs to be considered.
If you know the material, you can just calculate the amount of expansion.
Most of the current equipment is positioned at the rear end, and a diaphragm coupling is used for the wheel end.
Take a look at the bolt holes that fix the pump to the base bracket. Are the holes near the non-driving end long and have guide keys for the non-driving end? This is the first time I hear this. If you are referring to the rear end positioning, you are referring to the bearing positioning of the rotor. Then there is a problem with your understanding. You can find a BB5 high-temperature double-casing pump and see if the guide key under the pump body is on the driving end or the non-driving end.
NDE is the non-driving end. The hole that fixes the pump body is long and expands toward the non-driving end during thermal expansion. The hole for fixing the pump body at the driving end is a round hole, and the driving end is fixed. Therefore, the expansion of the shaft mainly expands toward the non-drive end. Has no effect on couplings