Testing 3D Printed Water Pump Impellers - Which One Performs the Best?
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- Опубликовано: 20 май 2020
- REMAKE: • Testing Different Wate...
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Testing out four 3D printed turbine designs. The water pump is powered by a 775 electric motor and the power supply is a power drill battery (3.0ah NiCad). In this video, u will see the building tutorial and after that testing. Results were really different from what I personally expected, I think this project was really useful and educational because the turbine what I was thinking as most powerful was actually...well u see in the video.
Every 3D printed parts that u see in this video are printed with PLA filament and with a 0.8mm nozzle. Free STL Files included as always.
I hope u did like that video and u will check out my other projects.
775 motor: www.banggood.com/custlink/vKm...
Water pump STL files: www.thingiverse.com/thing:438...
Storage box that was on my table: cults3d.com/en/3d-model/gadge... 
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Pink one was cavitating. That's why it wasn't doing much and making that "rock crusher" noise. Can't really draw much suction against a vapor bubble. That also indicates it's going too fast for that impeller design.
As far as testing otherwise, might be interesting to see what kind of head column the different pumps could produce. (The ability to increase pressure or pumping vertically up a tall pipe.) There are more factors in regards to pumping effectiveness than maximum flow rate. Thus in different applications the slower design for this test may still come out as being more favorable.
It wasnt cavitating, looks like hos is against the bottom on that one, wouldnt expect it that much worse than others honestly
@@Boz1211111 Actually, it looks like it is. The sound is heard on both the distance and underwater cams, and you can visually see the bubbles inside the pump on the later.
lol no. the pump has almost 1 atmosphere suction pressure.cavitaion happens when you have to suck the water up a few meters at high speeds.
It may be the battery. If the battery was not fully charged, the last test would result in less power.
what you mean pink, i just see red :)
You should also check how much pressure each generates by having them pump into the hose going straight up and measure the distance.
That's exactly what i was gonna suggest.. Also this is called Pressure head and it is measured in meters
Yeah I agree
@@zakariakhamees Yep, without pressure head the first numbers are meaningless.
i agree, try pumping water to varying elevations, from there you can see how the vanes perform as the height increases.
also amp draw
Interesting! Suggestions for another test: Measurement of Rpm, amperage, pressure .
Yes, agree with you. Vacuum capacity could also be a big variable (pump out of water, what intake hose length is the maximum for the pump to initiate flow and pressure).
Could be tested both horizontal and vertical (pump above water surface)
'Rpm, amperage, pressure .' Exactly, first thought. You need at least current so you can do current/liter/hour and find the best efficiency when just the fastest rate isn't the priority. Much more useful with just a little more data collected..
Exactly.
Say the grey turbine may not provide the flow rate compared to the other's. It may provide better efficiency at higher head pressures.
Centrifugal pumps are often measured in how much head pressure they can pump against and the flow rate at different pressures. I would bet the 6 blade would come out ahead on pressure.
For cleam liquid the close inlet is more eficient. I wold like to see for close
A static pressure test would help show why we have different blade designs.
i bet the grey one would excel at those
Pink impeller looked and sounded like it was cavitating.
the green one is kinda sus
This was interesting. Changing the battery mid test could skew the results, I suggest a more reliable power supply. Changing the design of the inlet face and size could improve the ability of the impeller to direct the flow. The inlet face seems overly open.
The battery should be charged after every test, actually. Lithium batteries are 4.20 volts fresh off the charger, and drop to a nominal voltage of 3.7V soon after you start using them.
...that is, if he was to continue using a battery, and not a bench supply, as you suggested, of course.
Heck yes. About time for a printing video. Haven't seen one in hours. Thanks!!
I made a gold dredge pump many years ago. same as the green one. i can add it had great pressure and volume, both needed in getting a gold dredge to work. Thanks for the video.
excellent test and video .. 40 years ago I had a cooling issue on my four stroke powered R/C model helicopters . . I conducted similar tests to yours . only using air .. not water . The biggest breakthrough was when I faced the cooling fan backwards and sucked the air PAST the motors crankcase prior to directing the airflow over the upper finned half of the motor . There is a two way spin off .. bigger fan equals more airflow .. BUT bigger fans take a lot of power , an amazing amount of power to drive at the 7,500 rpm motor power delivery.
the curved blades reduce the output but increase the pressure
so if you put the canister on >2 meters high you should see more
This comment is correct. You will get higher pressure on the curved blades.
@@court2379 No, it's not. When stationary, increased output pressure also means increased output flow.
Mafioso Max Why would the two be connected? (They’re not)
@@tbdcreations5370 The values pressure and flow are already connected to each other, but the more pressure you want to produce the less flow you get
@Mafioso Max
there are characteristic curves for pumps ... Google ;-)
EumlOriginal You’re right, my mistake. They’re connected but they are tradeoffs, essentially a difference of mechanical advantage. Mafioso Max suggested they both increase together.
This is what makes 3D-Printing awesome.
This is a cool idea . But you should test the pressure each impeller makes because I think curved blades increase pressure and decrease volume also angled blades do that too I think
Good to see someone else uses a 0.8mm extruder, and an excellent video too btw.
I maybe can explain, why gray and pink is less efficient:
These pumps rely on centrifugal force, so they pump by pushing the water/air/whatever u pump to the outside. As soon as the blades are curved the motion of the pumped fluid/gas to the outside is disturbed. And these disturbances have the effect of lower efficiency (because every disturbance of the motion of the pumped liquid/gas is an energy loss)
Sorry if my eng isn't this flawless, i'm actually from germany ... :)
The first and the last are the most efficient when it comes to pressurizing distance, these two models that I mentioned are used in centrifugal pumps.
A primeira e a última são as mais eficientes quando o assunto é distância de pressurização, esses dois modelos que eu citei, são usadas em bombas centrífugas.
But the gray one is most powerful one because pumping 'torque' is higher than others. It is like a 'car tyre air pump'. It can be used if you use it for pump *well water* from the deep of 'well'.
In my opinion, due to the fact that the pipe is installed on the pump in a tangential way the straight blades were more effective in compressing water in a tangent direction. The concave blades create forces on the water towards the center of the pump and not in a direction tangent to it so less water is compressed into the pipe and from there into the bottle.
You should also test it with the Lilly impeller design which is also used for wind turbines it is based on Schauberger design
Your turbine tests were quite comprehensive. Great insight indeed.
something about building something that just shoots out water and wasting water is so satisfying
Very interesting your test, I never imagined that the green turbine would have good results, congratulations and thanks.
Leandro Wagner.
It's counterintuitive to look at, but I think it makes sense. The curved blades push the water from center to rim at close to a constant speed whereas the straight blades provide acceleration from center to rim. This creates a stronger negative pressure in the center of the turbine pulling more water in and obviously it pushes water out at a higher velocity, net head being higher than one with curved blades. This would be less important in reverse I believe.
Waterquw
Call Kant nob
I think that the curved blade is printed in the opposite direction, maybe your conclusions are wrong man!
I dont care about water pumps or 3d printing but i watched every second of this video, super interesting
Interesting build. And well done video. I want to give some background information about pumps, as i have designed and tested industrial pumps as an engineer.
In general there are three important variables you should measure while testing the pump. The first is the Flow. This is the volume divided by the time, which you essentially measured. The second is the Head of the pump. This is essentially a measurement for the pressure the pump provides. Measuring this can be done in an diy environment by connecting a hose to the discharge side of the pump and measuring the hight, which the pump can increase the water level in the hose to, while the hose is facing upwards vertically.
importantefficiency. The efficiency of the pump is defined as (hydraulic Power output)/(Mechanical Power input). For your purpose measuring the Input of electrical Power would be sufficient, as the electrical motor has roughly the same efficiency in all cases.
With these three simple measurements you could truly classify your impellers and rate them against each other.
This is important as an impeller with straight blades will give you a higher output in pressure, but will worsen your efficiency. That's the reason, why they used straight blades in the case of the car pump. Changing the blades from straight to curved on the small pump won't change the overall efficiency of the car, but will increase manufacturing costs quite a lot. It could be, that your 6 bladed curved impeller will give you a worse Flow and Head, but will do so at an higher efficiency. My guess regarding the bad performance of the red impeller is, that cut blades in the centre will drastically worsen the flow and will induce cavities, which lead to an overall lacking performance and can damage the pump in some cases.
It would be awesome to see how your pump and impellers perform overall, especially regarding efficiency.
Very nice designs. What would really be a good comparison is also to measure the watts each one pulls. (Volts X amps). Good job.
when blades are curved rotation of the motor should be so that the blades bush water outwards. Your rotation is like pulling water from outside in.
No
@@angelgonzalez133 : Yes, basics of basic fluids dynamic. You: Go to the back of class!
@@bigcheese781 no go to class again
@@angelgonzalez133 : I understand you "No go class again", thats because you don't understand centrifugal pumps.
Stay in class folks, you'll learn pumps... =)
1:52 "water bump buddy"
great water bump test.
1st , 2st, 3st
Indian accent sux
I love the way you made demo.
The curved ones were probably more efficient, but the other ones drew more power from the motor so they pumped faster. You have to test the power used by the motor to properly compare the efficiency
It would be interesting to record the impeller r.p.m and the outlet pressure.
Great vid Sir!
Each of the propeller corresponding to one Pressure-volume curve. You need to apply a certain pressure to testify which one is more efficient. Under low pressure, the first two may dominate, yet under high pressure, the third one wins.
Did you measure wattage consumed? It would be interesting to track how the wattage and load on the motor changes in relation to the amount of water moved. There's a case to be made for a pump that moves less water while reducing load on the motor. Kinda like F1 racecar motors, going fast for just a few laps is one thing, commuting as a daily driver is a whole other use-case.
Still, NICE VIDEO, thanks!
-Make a testing rig having constant head at suction...
- try experiment with both CW and CCW rotation of curved vanes.
- do another experiment to measure the static head at outlet of each impler.
The Pink and Grey impellors are typically used/optimized for involute pump housings, just FYI
You didn't insure that the battery voltage wasn't dropping which would slow the pump motor, I agree that a pressure comparison would also help in determining most efficient impeller. Nice work..
If the gray impeller was connected to the spine, it would have worked better but not as efficient. ,There is actually too much volume of plastic in the design for it to be effective because it is reducing the void available for fluid to enter the chambers. As the old saying goes, it looks good on paper until you use it in the real world.
you should try making a pump curve for each of these to see how they perform at different pressures
pumps has another very important property next to the volumetric flow rate, that is the outlet pressure. You can't judge a pump without knowing all parameters. There are pumps with low flow rate but high pressure, and oppositely some of them can have very high flow rate but low pressure.
Amazing stuff - well done. I learned a lot as well. Thanks
when looking at pump efficiency you will need to chart the power vs head over the whole range. one pump might perform better at a certain load point but worse at another.
you can look how it is done, Google pump curve.
I think that, if you switch the terminals of the battery you will obtain extremely different results, but you should change with it the input and output of pipes, or/ you can print a new screws of same shape, but of different direction.
Damn this was interesting!!! Thanks for that info!
oh man i really love your accent its so cool dude!!!
Interesting and also useful at the same time
Very great video. Really appreciate your channel. Keep up the great work brother!
I hope you charged the battery for each test.
And please do more tests for pressure as well.
It'd be interesting to further test different curve angles for the impellers
It's right this way, first straight turbine blades convert more energy in speed, the others are more suitable for low speed and high pressure. Results are correct
turbine designs not only for amount of water also for pressure, how high the water-pump pumps water.nice job bro.
Brilliant video, thank you for sharing.
This video production is quite simple and nice to watch.
Crazy I watched this vid a while ago and I didn’t realize it was you haha I just remembered watching something similar and it was already liked
I come need on another of your videos about curved fins I stand corrected. Thank you! Can you do a test to show how the final shape of the impellers of each of these affects the pressure that the impellers can produce?
How about static pressure from the different designs? In other words how high of a water column they can hold up. Would be very interesting!
Agree
3:31 me when i go to the toilet in the morning
Im just looking for this , finally thanks
Fact: turbines with bigger gaps between each notch is going to be or will be the fastest/ most effective in water due to to amount of water being pushed out at one time.
Redo the test with the 5L container at a height of 2 meters and check flow again, this will give you a good indication of pump pressure. Some designs of impeller are better for flow others for pressure.
The grey one has low volume but high pressure, while the green and blue ones are a designs for low pressure at high volume!
The pink one is medium pressure at medium volume. With tangential wings you need more blades.
Hey, hello. Since is looks like you know a bit about pump impellers, would it be possible for you to say where i could read up on it?
@@FlamingToaster I have not found a good book yet - especially not in English (I'm German)
@@FlamingToaster read Up Viktor Schauberger He has the best Designs when it comes to Water. His philosophy was Understand Nature Copy Nature
@@Humbulla93 thanks, sounds interesting, but I'm more interested in engineering literature on machine design ;)
Cavitation on sharp edges are stronger, so the curved blades will last longer I think....
maybe it can do more pressure
This pump is not powerful enough to cavitate
@@Boz1211111 This pump is clearly cavitating with the pink impeller, this has nothing to do with power and everything to do with geometry. Cavitating in this pump is unlikely to damage the pump because of the low power but it will still drastically reduce pump efficiency.
@@MrAjam12 i thought that impeller is too big for this motor to spin it to such speed to cause cavitation, also, its curved impeller blade, so its even more weird
Only use blue impellers from now on.. 😇
I basically understand curved veins gives you a higher head pressure and lower flow rate and radial or straight veins gives you higher flow rate but lower head pressure if I recall my three or four semesters of fluid mechanics during mechanical engineering
The coolest narration ever 👍👍👍❤️
Great experiment !
Thank you, this is very useful information
Thanks for this info
More this kind of useful video. Like wind turbine different Method. Vertical etc. Best type of anything like this Pump and We could Learn from the resoult
Hi it would have been awesome if you also compared how those impellers performed on different hight
I feel the pink one would have the highest head
i agree the pressure would be great. how many meters of tube can you press water in when placed vertically
Good day, I think a simple test whereby the static head in meters is measured and converted to kPa or bar. Simply place the pumps on the ground and see how high above the ground level, in m, the pump discharges the liquid. You can use this pressure and flow rates to actually determine the efficiency as (Pout/Pin) as flow rate is not really a good measure of efficiency, it's just a measure of flow rate. But still a cool video, keep it up!
green - blue test confirmed 👍 ok back to my project
watching more youtube :)
Maybe is should be in reverse? Also I would be interested in the efficency and longevity
Make a test comparing how high they can lift water (water column)
Thank you for inspiration :)
Cool, tnks 👍
Very professional thank you
Your channel is epic!! Love it
Its because the of shape from impeller, curve and straight.
Curve shape make flow smooth, essential like sentrifugal work,
( low force than the straight blade, low vibration, long life working) able to handle back force pressure at the discharge pipe line that go vertical direction.
The straight blade, its like, suck alot, and pull with high force but not essence like sentrifugal.
(high consuming power cause of high force, and high vibration, better for small pump only.)
Cant handle the force back pressure at vertical pipe line its will be crack the impeller
I printed and checked. Works great!!!
Giving me ideas on how to automate my kitchen garden irrigation system
Green and blue
Interesting test! In order to validate your tests, you should do at least 3 test with each and present the mean and variance. This way it is much clearer what the average case will be as there are a lot of uncertainties in your setup
Ooh a helical (lily) impeller would've been a great one to try.
cool videos. I have been looking for a pump like this for a long time. I want it for my garden pool, can you please measure the current from the motor when it is blue or green. Thanks keep it up
I think, if the gray turbine had four blades, it would have won first place.
Is seems that your rotor was spinning in the wrong direction. and for two turbines the direction plays a role
exactly. I agree
You should have recharged the battery after every test to get a fair result. Great test over all
Exactly what I was thinking!
I'm willing to bet the curved impellers might give worse water flow, but better head pressure
Nice test good to know
Thanks mate
Very interesting!
I found this very interesting. I build automotive waterpumps. The boss thinks your pink one is the best to use, he is the boss after all, LOL.
Hi thank for your efforts I think you should do similar build and test for different viscosity liquids and compare too like oil, water etc
All my small plastic submersible pumps have impellers same as the first one. However my larger pumps have impellers similar to the grey one. These are all commercially made bought online.
You just gave me the idea to make electronic turbocharger for my mini four stroke engine
Amazing ! Thanks a lot
Yo this man should be in school teaching kids
blue and green
Great job thank you bro
Nice idea, but how about sealing the motor shaft? I assume there is a amount of water which slips sooner or later into the motors front bearing.