|The "Smart Little Sucker"|
|My old fridge pump system.|
|The pump was fan cooled on big jobs.|
The next step up from using a ball valve is a diaphragm and reed switch but I am not a fan of this version due to the lack of precise control as well as questionable electrical safety.
I wanted precise vacuum control without the pump having to run continuously and came across this veneer vacuum system from Veneer Supplies.Com: http://www.veneersupplies.com/products/Project-EVS-Auto-Cycling-Pump-Vacuum-Press-Kit.html
I was able to scrounge most of the required components from the parts bin at work except for a vacuum controller. I decided to use an SMC electronic vacuum switch for accurate control and the hysteresis function to reduce frequent pump switching.
The need for a small footprint as well as portability meant than I had to stack the components using a plywood shelf system. This is the prototype which will probably stay this way - functional!
Working from the Air Fitting back there is a ball valve to isolate the system from the vacuum bagging line. The ball valve is connected to the vacuum reservoirs(tubes of nothingness...) which are separated by a takeoff for the vacuum switch.
The reservoirs are then connected to a check valve(one way valve) to store the vacuum in the reservoirs.
|Top view of Vacuum Reservoirs, Vacuum switch and Check Valve.|
|3 Way Valve, Sub-reservoir/Filter and Pump.|
|Terminals, Contactor and 24V P.S.|