Inside a Chinese peristaltic pump from ebay.

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This is a quick look inside a cheap plastic peristaltic pump bought from China via ebay. Peristaltic pumps work by rotating rollers so that they pinch a loop of silicone tubing against an outer surface and force pockets of liquid through it. The primary advantages of these pumps is that they are simple, the liquid is pumped in situ in the tube and they are capable of pumping very precise quantities of liquid. They're widely used as dosing pumps for adding chlorine to pools or water supplies, adding detergents into industrial washing machines or dispensing ingredients into drinks.
Up to now they've tended to be very expensive, but ebay has quite a few listings for these pumps at around 10 UK pounds (about $15 US) which is actually very affordable.
This video shows the inside mechanism of these pumps, which in this case is very simple since all the tensioning seems to originate from the springiness of the silicone tube itself. I've not actually run this pump in earnest yet, so I'm now sure how it's going to handle the test of time, but I've got some silicone tube on order for testing purposes. I'd guess the biggest weakness may be the thin plastic spindles on the roller support plate, but then again, they are only there to guide the rollers and not physically drive them.
According to one of the ebay listings they are designed to accommodate 4.7mm outer diameter 2.5mm inner diameter tubing. This is probably an imperial to metric conversion from 3/16ths of an inch. I noticed that there is room for a deeper tube in them so I'm going to try standard 6mm aquarium airline tubing since it's easily available. I reckon as long as the wall thickness is about 1mm it will fit and pump correctly in the unit. (Or it may just turn into a pile of crunchy plastic.)
Quick update... I've tried the standard airline tube in and although it works it doesn't get pinched tight enough by the rollers to form a proper airtight seal, and thus has reduced lifting and pumping capability. However, the thinner silicone tube supplied with the pump is a good tight fit inside the standard silicone airline tube and gives good results.

Опубликовано:

12 окт 2024

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Комментарии : 120

@thekaratekid02 8 лет назад

Your channel is perfect for anyone involved in the maker movement. I wish there were more people like you on youtube. Please keep up the great work.

@BenjaminGoose 9 лет назад

0:16 this looks like a really disturbing self-portrait. On a more serious note, this is a really cool idea for a pump.

@davidfalconer8913 Год назад

Ingenious ! ..... the BIG problem with these pumps is they require a LOT of torque from the motor , most have discrete gears to slow the motor speed ( thus increasing torque ) .... FYI , the Silicone tube size shown is usually used in cheap printers , so must be available ( ? ) , hope that info is of use ( ? ) ............... DAVE™ ............

@golfercab7323 4 года назад

Great video and explanation! Helped me realize why the rollers in my pump weren't turning. The tube on the inside must have been old or have been pinched by the rollers in the same place for a long time so they stayed deformed and took too much force to turn. Also resulting in less friction of the motor shaft so it would only slip. Replacing the tubing fixed it!

@ronplucksstrings7112 8 лет назад

Peristaltic pumps are cute in their simplicity and function...and really only possible with super-flexi silicon tubing which doesn't mind (and returns completely from) repeatedly having the walls crushed to more than being in contact (a completely enclosed cell of payload is then essentially moved along the tube by the rollers...the action is not unlike milking a bovine teet...only in a circle...and you don't have to worry about being stepped on!)...only trouble I see with this one is it is driven by a DC motor which will haul-ass (and relatively uncontrollably) at high speed as soon as power is applied...medial peristaltic pumps typically use a stepper motor because combined with the high accuracy/repeatability of the volume that is trapped and moved between the two rollers in contact with tubing, their highly accurate speed/position (including at dead-slow) control allows a ultra-accurate dosing. You would not get anywhere near that accurate a dosing control with just a DC motor which free-runs at quite a high speed...sure you could time power to it, but power applied for even just a fraction of a second would result in a comparatively huge dosage compared to an accurately controlled stepper. ...not that I like steppers, their complicated control makes them less attractive for the experimenter/hobbyist, but I'd prefer to see this pump outfitted with a gearmotor or at the very least, or a PMW speed-control, so that dose would be a lot less and more precisely controlled. Please perform power-up and volume/on-time tests, without and with a speed controller added. Thanks for another great video BC!

@grassfed7852 9 лет назад

People also use these to dose fertilizer solution to their planted aquariums :)

@bcizzo 7 лет назад

I was looking for exactly this! A take apart of these pumps! Just so happens to be one of my favorite youtubers too, awesome. Cheers Clive!

@Arek_R. 8 лет назад

We can use stepping motor controlled by PC, it will be extremly precision pump. But remember that after some time we must replace tubing, otherwise it will break and leak! Professional pumps will say you when you should replace tubing.

@steggc85 8 лет назад

Used in auto pool chemical maintainer. I wish I could afford to shop for stuff on eBay to take apart lol. Love your vids!

@Tryin2FlyII 6 лет назад

That is the same type of pump (but much smaller) that they used in the water pics back in the 70"s when I took one apart. You remember those things

@webwolf7 8 лет назад

Very cool! I have the sudden urge to make an automatic detergent dosing system for my washing machine now....

@MrBanzoid 9 лет назад

Really handy to hack with a stepper motor and driver board + Ardino or similar for really accurate and repeatable liquid measuring. I once used an instrument with a few of these pumps in to suck up and dispense reagents and samples. It cost £££££££!

@thomfraleigh2499 8 лет назад

Hello. I bought a pump exactly like this from ebay. I build some bio/chem lab equipment as a hobby and was interested in peristaltic pumps as they allow for the sterile transfer of fluids because the fluid never touches the pump components. Mine came pre-loaded with the tube segment like yours. It seemed to function when I first used it but when I tried to change the tube by removing the face plate and adding a longer segment of tubing I could not get the rollers to spin again. I did use some special ordered smaller tubing, it still might have been about 1mm or so larger than the segment that was in there when it arrived so that could have contributed. When I re-assembled the motor I am having issues getting it to spin even on the tubing that was originally included. I'd say that if you're working with an application that you can just use connectors to connect tubing to the piece that's already in there that this pump is a good cheap option (ex. aquarium, laundry, alcohol, as you mentioned). If you are looking for an application where you need to frequently lay a new segment of tube across the rollers that this is not going to be a good fit. Commercial peristaltic pumps that handle sterile fluid have a easy on-off clamping mechanics for changing tubing. There are also a lot of really great posts out there right now on 3D printed peristaltic pumps, I think this may be what I try next. Thanks for the video it helped me understand that it was the pressure of the tube forcing the spinners against the motor shaft, I was initially confused how something that had no threading made them spin.

@bigclivedotcom 8 лет назад

+Thom Fraleigh The rollers inside have to be placed into a little track or spindle holes. If you assemble the unit with the rollers not in their correct position the motor will not be able to drive them. The last bit to be inserted into the roller mechanism is the shaft of the motor itself as it presses against the rollers to drive them.

@nighthawk759 8 лет назад

+bigclivedotcom try looking for nitro rc fuel tubing that's slightly smaller than aquarium tubing

@bigclivedotcom 8 лет назад

+last king They are better suited to slow transfer of liquids.

@Krankie_V 7 лет назад

The first time I saw one of these was at my first job, on a dish washing machine for pumping the detergents and sanitizers.

@ProdigalPorcupine 9 лет назад

It may have already been mentioned, but peristaltic pumps can be found in inkjet printers as part of the head cleaning system. They usually don't have a dedicated motor, though; they're driven by the sheet feed roller shaft iirc. You'd need to be a bit creative to hack one into a project, it's probably not worth the effort.

@44R0Ndin 8 лет назад

+ProdigalPorcupine I concur about "not worth the effort", I've torn apart a printer that had one of those, and it was ABSOLUTELY caked in ink residues. I basically had to chisel the hardened ink out of it. Even tho the one i took apart had seen especially heavy use (classroom printer), I'd think it's a pain to deal with the ink if the printer has seen even a single cartridge thru it. You'd at least need to know what solvent will both dissolve the ink and NOT dissolve the plastic. 3-d printing can probably take care of making an adapter to drive the thing from a stepper motor, as well as adapters for input and output of the fluids. This is just a first-pass at the idea from general principles, but the concepts should be sound.

@PhilXavierSierraJones 7 лет назад

Isopropyl alcohol works wonders on those things. In some cases, Acetone can be used to flush the tube. Wash entire thing in scalding hot water in order to get rid of residues and undissolved ink cruds.

@TechTroppy 4 года назад

RU-vid brings me here at this 6years old video. I am subscribed at this channel why I don't get newer recommendations 😅😂

@bigclivedotcom 4 года назад

Check your notification settings by clicking the bell next to the subscription settings.

@peckelhaze6934 7 лет назад

We had those on the wife's dialysis machine, the older ones. The blood would be drawn through the plastic lines by the rollers. Bit like massaging and squeezing through with the fingers.

@B0M0A0K 7 лет назад

Thanks very much bigclive, just thinking about incorporating it into an electric chain oiler (Motorbike).

@allanleroux5413 8 лет назад

The source of the silicon tube is from any radio control shop (Fuel Tubing for methanol engines NOT petrol tubing)

@peterjf7723 6 лет назад

These pumps were also used in the replenishment systems for photographic processing machines.

@MrBobWareham 6 лет назад

More silicon tube can be found at model shops very cheap

@EastyUK 8 лет назад

I had one of these reducing the fluid in my knee after an operation. They stitched the pipe in, so could't pull it out after. US medical system. You dont get what you pay for.

@sanderd17 8 лет назад

I wonder how precise these pumps still are with that gearing principle. As it's not driven directly, the gear ratio depends on the size of the rubber wheels, and I imagine that can variate a lot between cold (hard) wheels and warm (soft) wheels.

@mohammedshalash7842 10 лет назад

Thanks for this educational vedio, any ide of the motor speed reduction ratio, that is roller dia devided by motor shaft diameter? Thanks

@JorgeCarvalho_web_dev 8 лет назад

Love your reviews, thank you for sharing your work. Channel subscribed! Keep the good job. Cheers from Portugal

@AydinAdn 8 лет назад

"You can actually feel the friction of it going in" lol

@rabbitez 5 лет назад

Damnit clive, show us the thing working!

@stevenraeburn8178 3 года назад

I bought one ( waiting for it ) as I plan to make an automatic humidifier for my egg incubators...lol

@johannesbelin7685 9 лет назад

Great explanation. I'm wondering how high this pump can be used to pump water? I want to be able to pump water about two meter up.

@bigclivedotcom 9 лет назад

+Johannes belin Peristaltic pumps can lift water a modest height, but are designed for low volume applications.

@CrustyBiker 8 лет назад

i don't think it would be thin enough pipe, but my mum's old oxygen machine used something called oxygen bubble tubing, and to make sure it fit any fitting, every 1metre there was a "bubble" or flared bit of tube, so it could be cut at any point in the flared bits to fit any sized fitting, I though it was a fault in manufacture when I 1st saw a flare in it, but when told about what is was really for, I thought, how clever!, I have a nearly new 30m box of it that I'd be prepared to send to you if it's any use for just cost of postage, it says internal diameter 3mm but that might be the flared bits? its made by universal (un8800)

@Petertronic 7 лет назад

Are these used in coffee machines?

@hansdegroot652 Год назад

Hello clive. Maybe some day you could examine a senseo coffee maker.

@DavidNorwoodCCRE 7 лет назад

Thank you for the Video. I bought a pump, but the wheels/rollers do not turn. The space in the middle is larger than the shaft. So, there is no friction between the shaft and the rollers. The tube that was installed is not clear and and kind of compressed . Based on your video, I removed the tube and swished it back, but it did not help. I then replaced the tube with the smallest clear tube I could find, but that did not help. You mentioned you ordered a tube in the video. So, I was wondering if you were able to get the pump to work/ get the rollers to spin? If so, what is the size tube that worked for you?

@bigclivedotcom 7 лет назад

It may be that the rollers aren't sitting in their guide properly. They should grip the motor shaft when it is slid in between them.

@DavidNorwoodCCRE 7 лет назад

Thank you for reply. Based on your video, was able to realized that, but I want I need to know is what size tubing did you use to get it to work? The other issue for it not working is that there is some flex in the sprocket holding the wheels. I was able see what the Tubing the company in china should have provided, which is 2MM ID and 4mm OD. However, because it did not work, I thought I would ask you want size tubing you did use that worked for you. I believe that having the correct tubing size would force the roller sprocket together, but with the wrong size tubing it will never work. The rollers clearly need to be very tight on the shaft, but cannot be too tight. So, the perfect size would be required to work correctly. It may be better for me to just buy another one, but it seems like it would make more sense to buy the correct tubing size, as I only need 3 inches of tubing.

@Synthematix 10 лет назад

What a great video! will this pump work with cpu watercooling?

@bigclivedotcom 10 лет назад

I'm not sure I'd trust it for such a mission critical application as that. Especially given the deliberate low output designed more for dosing chemicals than bulk fluid flow. The best type of pump for that application is probably the re-purposed aquarium style pumps designed to pump the coolant at a high enough speed with minimum noise.

@bitemykrank1970 8 лет назад

I wonder what kind of flow rate the 1/8th tube gives? Scaled down electric version of the Dave Brown Six Shooter peristaltic pump, i wonder how long this would take to pump 32oz of methanol?

@fritzeph6550 6 лет назад

China is really amazing bringing more affordable gadgets to the world.

@softsmoken 4 года назад

Good stuff Clive!

@bcizzo 7 лет назад

I'm fairly new to electrical wiring/soldering, I have a stupid question... What is the safest way to wire up one of these pumps for a project long term. Assuming it will run unattended on a schedule. Would you just buy a 12v power supply and cut the wires and solder then heatshrink? or is there a safer way?

@bigclivedotcom 7 лет назад

I wouldn't expect this pump to put in continuous long term use. But for short bursts of operation it's fine. I'd suggest using a small connector to connect the pump to the power supply as that allows easier maintenance later.

@eddiespencer1 8 лет назад

Isn't this the sort of pump used in blood dialysis systems?

@zedorda1337 8 лет назад

+Edward Spencer Also blood and plasma donations.

@eddiespencer1 8 лет назад

the same principle, though..

@ZeedijkMike 6 лет назад

A smaller version is also used in some ink jet printers.

@jaakkooksa5374 8 лет назад

I wonder what kind of pumps are used in automated paint tinting machines?

@TheT3KO 10 лет назад

Hey, great video. Did you try using other tubes? I was thinking maybe 4x5mm or even 4x6mm. I just want to get the max ml/min and Im trying to get different tubes to test.

@bigclivedotcom 10 лет назад

The pump only works properly with the correct size of tube, so you can only change the flow rate by varying the speed or duty of the motor.

@TheT3KO 10 лет назад

bigclivedotcom Thanks, going to try it with 3x5mm tube because I cant find 2.5x4,7mm. Did you by any chance measure the max Amp draw of the pump?

@bigclivedotcom 10 лет назад

TheT3KO I can't recall the exact current, but I think it was a few hundred milliamps.

@superpomme 9 лет назад

TheT3KO Heya, how did the 3x5mm tube go? I am about to order some tubing :)

@bigclivedotcom 9 лет назад

superpomme I only tried it with the standard aquarium tubing. The only way I could get it to work with that was by keeping the tubing supplied in the unit and pressing the aquarium tubing over it on either side of the pump. Not ideal.

@Big_Loo 7 лет назад

They have them at 7-eleven for pumping chili and cheese onto hot dogs.

@psithikong10 10 лет назад

I'm doing project that have to pump fluid in and out so I wonder if I can use only one pump, pumping in the fluid first then pumping out the fluid? If yes, how can I do that?

@bigclivedotcom 10 лет назад

Reversing the polarity to the DC motor should effectively reverse this pump.

@psithikong10 10 лет назад

thank you so much!

@c.p.mathai626 10 лет назад

Hi ! Thanks for the video. Can you send me a link for where I can buy the pump?

@bigclivedotcom 10 лет назад

Banggood seem to stock them. www.banggood.com/12V-DC-Dosing-Pump-Peristaltic-Pump-For-Aquarium-Lab-Analytical-Water-p-931333.html

@c.p.mathai626 10 лет назад

bigclivedotcom thank you. can the rate of flow be controlled for these pumps?

@bigclivedotcom 10 лет назад

C.P. Mathai Yes. By controlling the speed of the motor or cycling it on and off.

@haranobuhardo5421 5 лет назад

is there any possibilities to change the DC Motor used on the peristaltic pump? Bc i want the pump to work slower (to produce very small flow rate). And im wondering can it be done by replacing the motor with the slower RPM (higher torque)

@bigclivedotcom 5 лет назад

You can get a number of different peristaltic pumps. Some with gears and some using electronic control to vary the motor and pumping speed.

@UmbreWolf 7 лет назад

I know this is an old video but we use this kind of pumps for our color feeders at work. (Work in injection molding, we use parisatic pumps like that to "Measure" the amount of coloring that gets pump in with the pellets of material. www.ptonline.com/knowledgecenter/blending/Liquid-Color-Dosers

@madmanzila 7 лет назад

HI thanks for vieo man ... but do you have a link to buy this ?

@bigclivedotcom 7 лет назад

Just search eBay for peristaltic pump and you will find a variety at different price ranges and voltages.

@marco_mauro 8 лет назад

thank you, it helps !

@alanjohnston5544 8 лет назад

+bigclivedotcom can it be used for hydrolics ? as in a rc vichel with hydrolics for to lifts stuff?

@minxythemerciless 9 лет назад

What tube connectors do you use with this? Any idea where to get more of the same type of tube?

@bigclivedotcom 9 лет назад

+Jeremy Ardley It's a smaller size than the common aquarium tubing. It may vary between models, but the Chinese sellers on ebay do stock a range of silicone tube sizes.

@miguelpires5856 9 лет назад

+bigclivedotcom i belive this is my problem, my tubes are getting air in ... am driving crazy tring to fix this problem , am using normal aquarium tube, and i belive that is the problem :(

@zlotvorx 8 лет назад

+Miguel Pires Plastic tube is not going to work. The basic working principle of the pump uses the fact that a silicone tube springs back to it's previous form after squeezing. Plastic tube tends to flat after some time.

@minxythemerciless 8 лет назад

+bigclivedotcom I haven't found any suitable connectors but I have found that you can slide a bigger tube over the supplied pump tube ends and get a good seal. I've also found that some people sell 'silicone' tube that's actually PVC - and that's not just ebay.

@44R0Ndin 8 лет назад

+Jeremy Ardley Caveat Emptor, as always. I'd bet that sometimes the seller doesn't even know the difference. aka: "I'm no expert, I just sell the stuff".

@THEDRAGONBOOSTER8 9 лет назад

Smart design..

@diegodigedez5914 10 лет назад

What is the dc motor model, is included in the purchase? Thanks¡

@bigclivedotcom 10 лет назад

The pumps are sold with the motor attached. They seem to be available in various voltages.

@HeWrd-fg8gg 4 года назад

Is this motor more silent than regular? Otherwise anyone know which is the most silent kind of motor i can find ?

@bansheemania1692 4 года назад

Brushless hobby motors are Very quite.

@johnbuckingham4568 10 лет назад

How do you power it? Battery or can you plug ii into a wall?

@bigclivedotcom 10 лет назад

It could be powered from a battery pack or a DC mains adaptor. The motor voltage is generally about 12V DC, but it will run at reduced speed with a lower voltage.

@AndromanceD 10 лет назад

bigclivedotcom How low the voltage can be for it to run? I'm between this 12v pump and the 6v pump. I need two for aquarium Co2 and nutrition liquid dosing (about 5-10ml/day). They will be running from two separate battery packs through 12v programmable timers (I couldn't find 6v timers) to a voltage regulator (for speed control). I'm I able to get as minimum as 5 ml/min from these pumps knowing that the min interval time of these DC timers I found on ebay is only 1 min (not seconds)? Many thanks in advance.

@patrickmalone1373 4 года назад

Ah, shitty gas station chili/nacho cheese pump, we meet again.

@joeirasm 8 лет назад

Could anyone provide a link to ebay where i can buy this?

@shimondoodkin 7 лет назад

maybe latex is preferred over silicone

@sitizanariahramli5532 10 лет назад

hello sir, how can i know the polarity?

@bansheemania1692 4 года назад

Soda fountains use these. Also Medical field

@B0M0A0K 7 лет назад

Does this have the power to pump oil?

@bigclivedotcom 7 лет назад

+B0M0A0K Thin oil at low speed.

@conorarmstrong 9 лет назад

do you know what pressure this can pump at?

@npy83 8 лет назад

+Conor Armstrong 1-2 bar , or reducedd flow for up to 7 bar ; some heavy duty may up to 16 bar www.watson-marlow.com/my-en/range/

@cnorris517 10 лет назад

Probably way way too late with this comment but the silicon tubing looks very much like RC fuel line as used in Nitro powered cars and aircraft. Something like this www.blacksmithproducts.co.uk/products.asp?cat=248

@bigclivedotcom 10 лет назад

Thanks, that's a useful link.