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| benchmark:
I need your expert advice. I have recently assembled a silent compressor,i used an old english model called 'Bambi' . It is one of the old models, solid construction, yellow in color if you know the series. It is an oil compressor and Bambi is world famous for making quality and silent compressors. I dissected my old but reliable cheap chinese compressor that was as loud as a dumper truck and i used the 24 liter tank, valves and gauges to make this one that is so quiet that it can run at shows under my table without anyone hearing it . I found the manual online for the engine which states that it is designed to have a 50% duty cycle and i have done some trials to test it . In my test trials, i noticed that the compressor is on for about 1 min 54 secs then rests for 2mins 45 secs before it kicks in and switches on again for another 1min 54 secs. So in theory this is within the recommended 50% duty cycle. Today after running for 2 hours , i used my infra-red thermometer to check the temp through the oil sight glass and it was 60 degrees centigrade so i manually shut it off after 2 hours in fear that itwas too high. My question is if you think the 60 degrees was normal? if yes how hot should i allow the compressor to get before i shut it off? Do you think this compressor can be used with the above described cycle over a 7 hour period for the display ? Thank you for your time. Here is a pic. |
| Bluechip:
Not all that good on compressors. Mine runs very hot on the air-cooled cylinders. Far to hot too keep your hand on. If this compressor is run under a similar regime to DC servo-motors, there's two bits to the duty-cycle. One is the part you have ie. 50% or 1:1. The other is the 'absolute maximum' ie, how long can it be operated in the ON part. EG Duty cycle 33% or 1:2 Max 5 minutes. So, the most it can be used is 5 mins ON : 10 mins OFF. After all 1:1 could be 1 day on: 1 day off. Duty cycle would be satisfied, but it would probably not survive. Dave BC |
| John Stevenson:
60 degrees isn't hot for oil, oil will happily run at 90 degrees all day. Duty cycles are usually based on 10 minute cycles but it all depends on the manufacturer. the 10 minute cycle is very common for welding machines. John S. |
| lordedmond:
Benchmark as to your trials you say 1 :54 on 2:45 off is that with no draw ? then you have a leak try it with a test engine /tool or WHY then see what is the the duty cycle is it could be 90 % on 10 % off is that Bambi big enough to supply your anticipated draw off at its rated duty cycle Stuart |
| benchmark:
--- Quote from: lordedmond on May 03, 2011, 05:27:09 AM ---Benchmark as to your trials you say 1 :54 on 2:45 off is that with no draw ? then you have a leak --- End quote --- No leak, it is with the compressor supplying air to run 3 model engines. The compressor gets to 6 bar (where i have set it) shuts off for 2:45 mins , by then the air is down to 4 bar so it kicks in again for 1:54 mins till it reaches 6 bar again...and so on. This is the cycle i will be running for 7 hours at a stretch and i will like to hear if you guys think that is pushing it too far. As stated i test run it for 2 hours when the oil temp got to 60 degrees centigrade and i turned it off. |
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