High temperature issue in Roots pumps
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Since there is no compression during the operation of a Roots pump, how can the temperature of the pump rise, especially the outlet temperature?
As long as it is a pump, there is a process of negative pressure suction at the inlet and compressed discharge at the outlet
The pressure inside the Roth pump increases rapidly; the increase in pressure and flow rate implies an increase in kinetic energy and internal energy, so a rise in temperature is inevitable； At the same time, due to the vacuum environment, the pump’s heat dissipation relies mainly on conduction through the medium and the rotor; if the thermal conductivity of the medium is poor, the temperature will be very high
A Roots pump is commonly known as a pressure booster pump; since pressure is increased, there is a compression ratio.
Some Roots pumps are equipped with cooling water pipes, which provide oil cooling; as a result, the exhaust temperature also decreases.
A Roots pump is a positive-displacement compression machine; since the gas is definitely compressed, there will be an increase in pressure and temperature, so the outlet temperature is necessarily higher than the inlet temperature.