The Roots blower has insufficient pressure
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The Roots blower has normal pressure when it first starts up, but the pressure drops once the temperature of the unit rises; the temperature can reach 117 degrees. Does it operate normally when the temperature is lower? Who has encountered such a situation? Is it a gap that hasn’t been adjusted properly, or is there some other issue?
With such a problem, the process issues should be checked first. Regarding the mechanical aspects, it is mainly necessary to check for any unusual noises or vibrations. If it is convenient to check the bearing clearance, then problems related to this clearance are quite common. For reference.
The inspection revealed a gap of 0.75 at the fixed end and 0.25 at the free end, with some friction spacers present at the free end.
1: Too small a gap adjustment or an inappropriate material selection can result in reduced gaps between the rotors as well as between the rotors and the casing due to temperature rise, which affects the efficiency of the fan. 2: Abnormalities in the equipment occur due to changes in operating conditions; check whether process parameters such as the filter at the fan inlet and the backpressure temperature at the outlet have changed. 3: Has scaling occurred on the fan casing as a result of long-term operation? It depends on the properties of the medium.
With such high temperatures and signs of friction, it seems to me that the gap is too small, which causes frictional heating and thus affects efficiency, resulting in insufficient pressure.
In addition to what the others have mentioned, the impact of ambient temperature also needs to be taken into account.
There’s clearly a problem with this gap of yours
There’s clearly a problem with this gap of yours
Well, I tested it before disassembly; the fixed end is 0.75 and the free end is 0.25