The vacuum system consists of vacuum pumps, pressure stabilization
tanks, gas–liquid separators, and connecting pipelines. The vacuum
pump generates a vacuum, which is then distributed to each sand box
via a vacuum distributor, providing sufficient suction to prevent
the mold sand from collapsing during pouring.
I. System Components and Functions
1. Vacuum Pump
The 2BE series water-ring vacuum pumps are high-efficiency,
energy-saving products developed by our company based on years of
research, production experience, and advanced imported
technologies.
· Function: Used to extract air or other non-corrosive, water-insoluble gases
to create a vacuum or maintain process-required pressure in a
sealed container.
· Purpose in Casting: Provides the vacuum needed during pouring, ensuring a stable vacuum
field in the sand boxes.
2. Pressure Stabilization Tank & Gas–Liquid Separator
· Function: Filters solid particles from the extracted gas using water,
stabilizes vacuum pressure, separates gas and water, and further
removes solids from the air before discharge to prevent air
pollution.
· Benefits: Maintains a stable and reliable vacuum; the vacuum pump operates
efficiently with low wear, high durability, and easy maintenance.
3. Application in Sand Boxes
· Vacuum extraction removes air between sand grains, compacting the
sand and forming a stable mold inside the sealed sand box.
· During casting:
o Accelerates gas evacuation and reduces total gas volume.
o Lowers gas pressure at the metal–mold interface.
o Speeds up the advancing metal flow front, improving mold filling.
o Reduces surface carbon defects.
o Suppresses combustion of foam pattern materials, promoting
gasification.
o Improves the environment, increases metal fluidity, moldability,
and clarity of casting contours.
· Higher vacuum levels further suppress foam pattern combustion,
accelerate pyrolysis and decomposition, shorten residence time of
pyrolysis products in high-temperature zones, and reduce the
likelihood of deep pyrolysis.
II. 2BE Series Water-Ring Vacuum Pump Parameters
Model | Pumping Capacity (m³/min) | Max Vacuum (Pa / MPa) | Speed (r/min) | Power (kW) |
2BE1-252 | 20.5 – 34.7 | 3300 / -0.097 | 565 – 920 | 30 – 75 |
2BE1-253 | 29 – 49.7 | 3300 / -0.097 | 565 – 920 | 45 – 90 |
2BE1-303 | 43.3 – 70 | 3300 / -0.097 | 472 – 790 | 55 – 132 |
2BE1-353 | 58 – 96.3 | 3300 / -0.097 | 372 – 660 | 75 – 160 |
2BE3-400 | 75 – 140 | 16,000 / -0.085 | 300 – 610 | 75 – 220 |
2BE3-420 | 92 – 192 | 16,000 / -0.085 | 300 – 610 | 110 – 315 |
Note: Pumping capacity, speed, and power are ranges. The performance of a
single water-ring vacuum pump varies with its rotational speed.
Example: Model 2BE1-253-820 (speed) – 75 kW has a maximum pumping capacity
of 42.7 m³/min.
This system ensures stable vacuum creation, optimal sand
compaction, improved casting quality, and environmental safety in
lost foam and precision casting processes.
