DIY "Stream" Style Pump
- Thread starter thunt
- Start date
cudaxtreme
New member
cudaxtreme - looks very similar. See my post above to solve the random spinning problem.
Just notice an error in my earlier post, so I'll retype:
I think I've solved the problem of the impellor sometimes running the wrong way. When it does this, it makes the propellor lift as the water is now pushing out the back. By placing a stop just in front of the prop it runs freely when the props going the right way. When the prop runs the wrong way, it lifts slightly, hits the stop and then starts spinning the other (correct) way. Make sense? All this happens in a split second. Needs to be incorporated into the guard/housing which is where I've got to at the moment.
Tim
Just notice an error in my earlier post, so I'll retype:
I think I've solved the problem of the impellor sometimes running the wrong way. When it does this, it makes the propellor lift as the water is now pushing out the back. By placing a stop just in front of the prop it runs freely when the props going the right way. When the prop runs the wrong way, it lifts slightly, hits the stop and then starts spinning the other (correct) way. Make sense? All this happens in a split second. Needs to be incorporated into the guard/housing which is where I've got to at the moment.
Tim
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cudaxtreme
New member
sorry but I couldnt figure how its going to work, do you have some drawings or pictures?
No drawings, just the pictures already posted.
I allowed some slack in the positioning of the impellor. It can slide in and out by about 1/4". When its running the right way, its pushing itself back into the powerhead and so stays in place.
When it runs the wrong way, the propellor is trying to pull the impellor out. As I've allowed it to rise by 1/4", this makes the prop hit a stop, which in turns forces the powerhead to run the other way.
The vanes of the prop are also angled such that when it runs the wrong way, there's a leading edge that will hit the stop. When it runs the right way, it just glances of the stop and re-seats itself.
Hope that makes sense.
Tim
I allowed some slack in the positioning of the impellor. It can slide in and out by about 1/4". When its running the right way, its pushing itself back into the powerhead and so stays in place.
When it runs the wrong way, the propellor is trying to pull the impellor out. As I've allowed it to rise by 1/4", this makes the prop hit a stop, which in turns forces the powerhead to run the other way.
The vanes of the prop are also angled such that when it runs the wrong way, there's a leading edge that will hit the stop. When it runs the right way, it just glances of the stop and re-seats itself.
Hope that makes sense.
Tim
Seek and ye shal find...
Seek and ye shal find...
Check out what I stumbled accross.... 
Now Only if I could find more info..
http://www.personal.psu.edu/faculty/s/b/sbj4/aquarium/reeftec-mod/prop-pump1.jpg
http://www.personal.psu.edu/faculty/s/b/sbj4/aquarium/reeftec-mod/prop-pump2.jpg
http://www.personal.psu.edu/faculty/s/b/sbj4/aquarium/reeftec-mod/prop-pump3.jpg
Seek and ye shal find...
Check out what I stumbled accross....
Now Only if I could find more info..
http://www.personal.psu.edu/faculty/s/b/sbj4/aquarium/reeftec-mod/prop-pump1.jpg
http://www.personal.psu.edu/faculty/s/b/sbj4/aquarium/reeftec-mod/prop-pump2.jpg
http://www.personal.psu.edu/faculty/s/b/sbj4/aquarium/reeftec-mod/prop-pump3.jpg
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