Micropump Cavity Style Pump Design & Suction Shoe Pump Design

Micropump External Gear Pumps

The majority of Micropump pumps fall into two categories:

• Cavity style - which represents conventional gear pump technology
• Suction shoe style - which represents a considerable modification

The suction shoe Design is a patented design and is exclusive to Micropump products

Gear Pumps - Cavity Style

• The conventional cavity style pump seals the gear tips by placing the gears inside a cavity
• The sides are sealed by placing the cavity plate between the pumpbody and the pump bearing plate 
• Two gasket-like seals are used between these three metal components

Cavity Style Pump - Exploded View

Gear pumps - Suction Shoe

• Suction shoe style gear pumps seal the gear tips by using only a portion of the cavity
• The portion is called the Suction Shoe and seals only the minimum number of teeth (2)
• The fluid is positively displaced in the same manner as the cavity style pump to the outlet
  
  

Gear pumps - Suction Shoe

• Like the cavity style pump, the sides of the gears are sealed on one side by the pump body
• The other side is sealed only by the lip of the suction shoe
  
  

 Suction Shoe Style Pump - Exploded View