How Positive Displacement Blowers Work

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How Positive Displacement Blowers WorkAlthough vehicles, machines, and industrial mechanisms are often complicated, the individual steps of their workings are often quite simple. Each part of a complex mechanism does just one job. For example, a pump moves fluid from one place to another, and a blower does the same for air.

Our team at Pat’s Pump & Blower has extensive experience working on many kinds of blowers, and we want to assist you with making sure your blowers remain in great condition. In this article, we will focus on positive displacement blowers, providing an overview of how they work.

  • Inlet Port – When air or gas first enters a positive displacement blower, it does so through the inlet port. This is an opening at the top of the blower where gas can move into the next part of the mechanism: the blower housing.
  • Blower housingThe next part of positive displacement blowers is the blower housing, which houses two rotating lobes. The lobes rotate in opposite directions, which moves the gas from the top of the chamber down to the bottom. The lobes in positive displacement blowers are shaped differently for different varieties of blowers. Lobe PD blowers have lobes with straight blades, while screw blowers’ pistons have helical threads like a screw. A lobe blower does not compress the air as it rotates, while a screw blower does.
  • Outlet – Once the air or gas in positive displacement blowers reaches the bottom of the blower housing, it is let out into the next portion of the mechanism.