VACUUM CHAMBERS: VAPOR PHASE AND HOT AIR DRYING

APPLICATION:  Cylindrical or rectangular vacuum-rated tanks for the heated vacuum drying of oil-filled electrical devices such as pole-mount, pad-mount, power or distribution transformers; bushings; capacitors; power supplies; x-ray tubes; CT-scan tubes and other high voltage devices.

CONFIGURATIONS:  Cylindrical tanks rated for full vacuum are available for very small applications up to about 60” diameter.  Rectangular chambers rated for full vacuum are available up to 21’ wide x 21’ high x 45’ long inside clear rectangular for drying of single or multiple windings simultaneously.

OPENING TYPES: 

• top opening clam shell

• single or double end opening with the following door types:  vertical lift, horizontal lateral or horizontal hinged swing.

HEATING METHODS:  Include cold chambers (vacuum drying only); heated chamber walls for radiant and natural convection heating; hot air circulation; hot oil spray; and vapor phase.

VACUUM SYSTEM:  The latest in dry screw pump technology to eliminate seal oil maintenance; system sized to the chamber volume; expected moisture load; desired endpoint pressure and expected cycle time.

Condensing systems are available for interception of oil vapor, vapor phase fluid (for vapor phases) and water collection.

Vacuum break can be from opening to plant through a silencer or be connection to plant dry air or dry nitrogen.  Nitrogen purge during processing is also available as an option.

CONTROL SYSTEM:  GE Fanuc or Allen Bradley PLC’s with large color HMI touch screen with simple recipe-based operation; graphical data display and logging capability.

IMPREGNATION: Is available by either dedicated fill drops inside the chamber or by flooded chamber method after drying.

DEVICE CONVEYENCE: Loading trays / racks are available for small parts; drawers, trolleys and conveyor systems are available for larger parts/transformers.  These can be manual movement or powered and can include isostatic pressing where applicable.

Drawbridges for trolleys or air pallets are available as are retractable and collapsing conveyors.