Commercial Blower Distributor: What is a Positive Displacement Blower?

A positive displacement blower – otherwise known as a PD blower or rotary air blower – is a type of machine that is used to move gas or air for a variety of applications. As the area’s top commercial blower distributor, today we’re sharing information regarding a popular type of commercial blower – the positive displacement blower.

These devices utilize positive displacement technology by trapping a certain volume of air and then discharging or forcing it out against the system pressure. This air is usually forced into some type of pipe or hose to propel materials or gas to the desired destination.

If you were to dissect a PD blower you will notice that the main parts of the machine are two rotors that are joined together by gears, surrounded by a blower casing. Many blowers also come with a sound absorber, air screen and other parts to improve efficiency, but when explaining how the equipment functions we only need to focus on the rotors, blower casing, inlet side and outlet side of the machine.

Once a positive displacement blower is in operation, both rotors will rotate at the same speed but in opposite directions in order to draw air into the blower. One rotor is called the “driving rotor” because it is run by an external power supply, while the opposite rotor is called a “driven rotor” because it is driven by gears that are connected to the driving rotor.

As the rotors revolve, air is pulled into the inlet side of the blower and is confined to tight areas between the rotors and the blower casing. This pocket of air is moved around the rotors and blower casing to the outlet side. Once the rotors open to the outlet side, the discharge line equalizes the pressure of the air and is forced out of the blower.

The air is unable to come back due to the small amount of internal clearance between the internals of the machine. This process enables the blower to overcome line pressure hence the name positive displacement. Put differently, the volume of air does not change within the device, but is rather displaced from one end of the machine to the other.

The load resistance of the material carried in the discharge line helps to create more pressure, which in turn improves the functionality of the machine. In fact, many positive displacement blowers need some sort of backpressure to generate a substantial pressure reading to propel the materials or gas handled in the system.

As stated, these commercial blowers are used in a variety of applications and industries, making them a desired investment to improve processes and cut lead times. As a commercial blower distributor, below are some common applications of PD blowers that we see:

Chemical: Vacuum Processing and Conveying;
Dairy: Automated Milking;
Environmental Services: Sewer Cleaning and Portable;
Cement and Lime: Fluidization and Conveying;
Resin and Plastic: Processing & Conveying;
Process Gas: Gas Boosting;
Soil Remediation: Vacuum Extraction;
Industrial: Material Vacuuming;
Milling and Baking: Blending and Conveying;
Dry Bulk Hauling: Trailer Unloading and Aeration;
Power Generation: Fly Ash Conveying and Aeration;
Pulp and Paper: Chip Conveying and Process Vacuum;
Oil and Gas: Gas Collection;
Aquaculture: Aeration.

As the premiere commercial blower distributor in the area, we can help you choose the best product to improve your processes. Each of our blower lines has unique features, making them an ideal machine for a variety of industries. Contact us today to learn more about our commercial PD blower packages!

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