How To Home Water Pump
One of the reasons that I’m already planning an automatic greenhouse for my garden, in which I, for example, will be measuring the humidity of the air, and to have in order to determine when to water the plants for such a watering system, I would of course require some sort of water pump. And that was the moment I started searching for 12 volts DC one on Amazon. But as you can see, the selection is not that huge, and thus, I was more or less forced to go with this 1240 611, which, according to its product description can. And since the company is trying to make motion control, not only the sponsor of this video, but also produce all kinds of awesome ICS for motor control recently sent me a brand new prototype motor controller boards, along with a powerful bldc motor. I will try to create my own 3d printed water pump who fits in this episode of dry so that at the end, we can determine whether it makes sense to try a water pump, or whether we should stick to the commercial solution and stance. Let’s get started.
First off, we need to understand how the small commercial water pump works in order to create a bigger replica. So, I added adapters onto the two threads of the pump, and then used some sealing tape in order to make everything watertight so that in the end, I could push to 12 millimeter wide PVC tubes onto them. At this point, I hooked up the power wires to a 12 volt power source. And as you would expect the motor draws current and something started rotating inside the pump. That means, it was time for me to get two bolts and fill one up with exactly one liter of water. But the problem was that no matter which PVC tube I placed in the water, the pump never started transporting the water on its own. The reason is that this kind of water pump is not a self priming pump, which means I have to use some of my own energy in order to get the water to the pump. But afterwards, it does a job, without a problem. And it seems like the water can only enter this way and exit this way. Now, after doing some more or less scientific measurements. I calculated, an average flow rate of around 10 per minutes at an average power draw of around 7.4 watts, which means that the product description was pretty accurate and good those tests out have moved the adapters, as well as the screws that held the pump together. After removing the front piece, we can see a wheel, which was being turned by the utilize motor.
So what happens is that the water enters through this hole and fills up the entire space around the wheel. And why do we love spinning it accelerates the water, which flows radially outwards and into a hole, wherever that is it’s because of this functional principle. This kind of pump is known as essentially a fuel pump and, theoretically, we should be able to 3d print the mechanical parts for it. But while I was getting close to finishing the first sketch of my own centrifugal pump. I noticed that was our adult over it, I think it was already created a pretty promising looking design for this one. Of course, I would not require its motor mounts, since I will be using a different motor. But the main components, don’t look very nice. So, I download its files and imported them into the prusa software, in which I obviously slice them. Afterwards, I 3d printed each model of my prusa I free apart three 3d printer, for which I used orange PTV elements to get the pump, a bit more mechanical strength. As soon as the three parts were printed. I removed all of their support material, which was a bit more difficult than expected. But nevertheless, as soon as that was done. We can already see how dogs will fit together later on. So now we need to teach the motor in a way to constantly turn the wheel. For that, I firstly added a motor coupler to the wheel, which coincidentally, also perfectly fits onto the Moto sharps. So, the only measurement, I required was the height of the wheel shafts, which was around six centimeters.
And with the measurement, and through the help of the datasheet of the motor, and it’s given magnetic dimensions. I created a fitting motor moment in one to 3d design. The next step to your 3d printers, which turned out just fine. Now to finish the maker setup. I firstly created a circle shape with silicone tape, which I placed inside the ring cavity, into which I then placed an ice cold Obering that got hammered into position. Next, I add another ceiling on the inside for the wheel. Then poked a hole through both of them. And finally added the wheel to the system. At this point, I started adding up and adding the silicone tape all around the pumps edges, which, in retrospect, was ideal. So, I will not waste time talking about that and just say that the pump was completely. After using empty screws to close everything up next. So, wooden boards, to which I firstly marked the pumps mounting holes in order to drill them, and secure the pump to it with M four bolts and nuts. Afterwards, I flicked the motor inside the motor mounts to edit the motor shaft coupler to the wheel and the motor shaft. In order to determine the position of motor mounts. After then marking its mounting holes and drilling them as well. To compute it with M four bolts and nuts to the wooden boards. And just like that, the mechanical construction that should have been complete. But at this point, I noticed that the silicone pipe the pump in does the movement of the wheel. So, I was more or less forced to remove most of it and instead create a watertight seal without hot glue.
Now finally, we’re gonna do a drive to the DC motor, for which we could use a generic ESC, but like already mentioned, they’ve sent me this new top five prototype boards that combines a RISC five MCU motion control on, which is pretty unique. You can find more information about the boards on the intense, but for now let me tell you that you can configure it with the provided, cidp, or programming directly to the eclipse software. I also need to tell you that I did not run it. Since, you see, it is fairly complex and more of a hardware guy. Instead of trying to mix employment for me. And its function is to basically drive the motor with an adjustable rpm. According to the position of the potentiometer. So, after programming the boards, who put all the required wires and components and poured everything over 12 volt power source. As you can see, the motor rotates without any problems. And it seems like our pump is regulated.
That is why I added two millimeter wide hoses, to the entry and exit hole, and once again got myself to both, but I realized fairly quickly that this big pump, in combination with the big tubes does well with my small bolts. So, I was forced to move to the bathtub, in which the dry pump showcase was desperately trying to pump water. But as soon as I increased the RPM to a certain degree, something went terribly wrong. It seems like the bill is not strong enough for the wheel shaft. And since I was not even going with half power roof. It seems like 3d printing a big and powerful water pump is not such a good idea. Of course, they’re all just promising looking 3d printed micro water pump on Thingiverse.