Re: fridge pumps for vacuum
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Charles This is all just a guess The small inlet size to these pumps will be a problem. As the vacuum gets low it takes a long time for the air molecules to move from one end of a pipe to the other. understand that there is no such thing as sucking the air out in the same fashion as sucking a fluid from one place to another. If you were moving a fluid hooking the pumps in series would increase the lifting height / suction a great deal because you would be working with a simple pressure difference from one side of the pump to the other. With vacuum the pump can only move the molecules of air from one side of the pump to the other small pumps simply dont have enough molecules getting to the inlet side of the pump to be efficient. Placing 2 pumps in parallel will double the amount moved adding one in series will increase the efficiency of the first 2 a small amount all together this might be enough to make the system work, however it may work better just having all of the pumps in parallel time to experiment Keep the pipes going to the pumps as large and short as you can. I thing these pumps require oil to make them work. in a closed system this is easy just pour in the right amount and the vapor just circulates back to the pump. when the system is open you need some way to keep the right amount of oil in the pump. Maybe just measure the amount of oil in each pump now -then drain and measure the oil from each pump to keep it the same Any how try, it you already have the pumps so what do you have to lose? Good luck Ron Charles Mitchard wrote: Hi, |