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Thread: oil pump Copeland/Frascold/Dorin
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07-11-2009, 12:17 PM #1
oil pump Copeland/Frascold/Dorin
Does someone have drawings and an explanation of the working principle of the oli pump you commonly sees on Copeland compressors?
The swash plates which rotates +/- 90) when rotation of compressor changes and locks against a pin. The asymmetric inner pumphouseplate is moving then from one side to another and in- and outlet remains always the same. need this to insert in a course.
Same question for the Bitzer oil pumps (or from what's left because they will change now to splash lubrication on most of their compressors)
What is Frascold or Dorin using? I thought Dorin is using the same working principle as Copeland.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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07-11-2009, 05:24 PM #2
Re: oil pump Copeland/Frascold/Dorin
The asymmetric crown is to make sure the pump is delivering positive displacement when rotating both CCW and CW.
There is a generic exploded view here: http://www.frascold.it/pdf/SPARE/FCAT08-06-V.pdf
If you'd like a more detailed view, drop me a pm on monday
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08-11-2009, 07:28 AM #3
Re: oil pump Copeland/Frascold/Dorin
To both posters, thanks already for your help which was helpful. I was looking also for a explanation of the working principle. I know how it works but to explain this in plain words isn't that easy. And.. I'm not sure that my explanation is 100% right.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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08-11-2009, 08:36 AM #4
Re: oil pump Copeland/Frascold/Dorin
The inner rotor is axially displaced from the out rotor. While rotating, the vanes open on one side of the rotors (volume increasing) where oil suction is, and close on the other side (volume decreasing) where oil discharge is, very much like on rotating vane hermetic compressors.
The out ring, as explained, inverts discharge and suction when the motor is rotating the other way around.
EDIT: I forgot. This type of gear pump is capable of delivering excessive pressure, and this is the reason why a limiting valve is installed, which basicly is a spring with a shutter ball. This valve will tend to close as years pass by, and as the pump wears.Last edited by NoNickName; 08-11-2009 at 08:38 AM.
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09-11-2009, 07:44 AM #5
Re: oil pump Copeland/Frascold/Dorin
NoNickNAme, apparently, the Frascold works the same way as a Copeland.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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09-11-2009, 08:43 AM #6
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