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SIZING VACUUM PUMPS AND RECEIVER TANKS

Correctly sizing vacuum pumps and receiver tanks for specific applications is critical to proper function. Vacuum pumps generate the vacuum level within a defined volume that is the receiver tank. Vacuum level is measured in relation to ambient atmospheric pressure and reported in units such as Torr, inches of mercury (“Hg), Pascals (Pa) or millibar (mb).

The critical feature of the pump is the speed at which it can evacuate a volume of air down to a particular vacuum level as measured by average cubic feet per minute. If the pump is too small, it will not be able to achieve sufficient vacuum within the shot cycle. If the tank is too small, it will not provide a sufficient reservoir to evacuate air from the cavity. Midland Technologies can calculate the required pump and tank size for your specific casting application.

image of vacuum pump
image of a vacuum pump

CONFIGURATION OPTIONS

STANDARD VACUUM SYSTEMS – OIL-SEALED, ROTARY VANE PUMPS

Standard Vacuum System Chart

vacuum pump sizing form image

Portable and central vacuum systems are available in a variety of sizes and configurations. Not sure what size vacuum pump you need?  The first step is to complete the Vacuum Pump Sizing Form and submit it to Midland.  We will calculate the recommended vacuum system, including the pump and tank size, for your application.

PORTABLE SYSTEM CONFIGURATION

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PRE-INJECTION

  • Solenoid is closed
  • Vacuum pump evacuates the receiver tank down to vacuum level
  • Die is in the closed position

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EVACUATION OF CAVITY/INJECTION

  • Injection begins
  • Solenoid on vacuum system opens when plunger tip covers pour hole
  • Air evacuates from the sleeve and cavity through the vacuum block
  • Slowing down the slow shot can increase time for air evacuation

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SOLIDIFICATION

  • Cavity fill and solidification
  • Vacuum can remain on throughout solidification for process simplicity and to ensure maximum evacuation

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CASTING EJECTION/RECOVERY

  • Solidification complete
  • Solenoid on vacuum system closes
  • Die opens and casting is ejected
  • Vacuum pump recovers vacuum level in receiver tank as necessary
  • Cycle repeats
Custom Solutions Icon

CUSTOM DESIGN OPTIONS

Whether you need a replacement block or a new unique block for your project, Midland is your
solution source for any of your custom needs.

Custom designs and alternative formats include: Custom Dimensions, Corner Radii, Double
Flow Areas, Ejection Pin Holes, Custom Water Lines and Steps.

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