Hi,

I want to use an electric pump to dispense the hand sanitizer gel ...

should I use a type pump that gives me a small amount of gel at a few pulses?

can anyone recommend me some model?

do I see if I find peristaltic dosing pump?

 

Hi,

I want to use an electric pump to dispense the hand sanitizer gel ...

should I use a type pump that gives me a small amount of gel at a few pulses?

can anyone recommend me some model?

do I see if I find peristaltic dosing pump?

I'd try to take a look at one of the commercial units and see how they do it. I suspect a positive-displacement, plunger type pump. Like a syringe. But that's just a hunch.

 

Hi,

I want to use an electric pump to dispense the hand sanitizer gel ...

should I use a type pump that gives me a small amount of gel at a few pulses?

can anyone recommend me some model?

do I see if I find peristaltic dosing pump?

Yes. Peristaltic pumps are used in diswashers for exactly that purpose. Controlled dosage. Tpically 230 VAC 3.5W. All you need is a plug and a push button electrically speaking.

 

ok could you indicate some model or link?

 

Yes. Peristaltic pumps are used in diswashers for exactly that purpose. Controlled dosage. Tpically 230 VAC 3.5W. All you need is a plug and a push button electrically speaking.

Those dishwasher pumps are for quite thin liquids, and so they may have a problem with the thick gell stuff. In addition they all have a lot of external plumbing and so the system would be fairly involved.
Please describe the specific goal of creating such a system, and what sort of use is anticipated, that matters quite a bit.
A system to be used by the general public must be far more durable than one used by a household or family. Keep in mind that perhaps 10% of the general public will totally ruin almost everything that they touch.

 

One building I work at has "electric pump to dispense the hand sanitizer gel" in the elevators. They are not near the floor buttons. They are on the far wall about belt high. When the elevator is too full people are forced to push against the wall. The dispenser will fill my back pocket with gel.

 

These things exist already, if you just need one it's surely cheaper to buy one, if you include labor hours in your cost. On second thought, maybe none are available about now with the virus issues in the world..

Or if you want a one-off for a fun project, you could make a fixture to hold a regular pump bottle of sanitizer from the store, get a gear head motor for a few bucks, 3d print a cam lobe for it then add whatever kind of trigger you want to make the motor run. Assemble it all so that the cam lobe pushes down on the bottle dispenser. Presto auto-dispensing sanitizer.

 

Those dishwasher pumps are for quite thin liquids, and so they may have a problem with the thick gell stuff. In addition they all have a lot of external plumbing and so the system would be fairly involved.
Please describe the specific goal of creating such a system, and what sort of use is anticipated, that matters quite a bit.
A system to be used by the general public must be far more durable than one used by a household or family. Keep in mind that perhaps 10% of the general public will totally ruin almost everything that they touch.

Not at all compicated. They can handle thick concentrated washing up liquid comfortably. They are quite robust. All you need, as I said, is 230 VAC power supply and a push button to activate the motor for as long as you like. As for the detergent there are two ports. One with a tube to the detergent bottle (on the right in the picture) and one from where the detergent is dispensed.

 

ok could you indicate some model or link?

Just google "persitaltic pump". They come in all shapes, sizes and prices. If you go for a 230 VAC one then you don't have to bother with a DC adapter. The low voltage DC pumps tend to be a bit cheaper but then theres the adapter cost on top.

This one below looks like a reasonable one. So if you can imagine this mounted inside a box connected to a 13 amp plug with a push button in series and a tube going from the right hand port into the deteregent bottle and the left hand port spitting the detergent into your hand.

https://www.ebay.co.uk/itm/UNIVERSA...TERGENT-CHEMICAL-DOSING-PUMP-KIT/132415065512

 

One approach:

 

Not at all compicated. They can handle thick concentrated washing up liquid comfortably. They are quite robust. All you need, as I said, is 230 VAC power supply and a push button to activate the motor for as long as you like. As for the detergent there are two ports. One with a tube to the detergent bottle (on the right in the picture) and one from where the detergent is dispensed.

The three pumps that I have are functionally similar, but with 120 volt 60Hz motors and they are not nearly as muscular looking as the ones shown. And the connections and enclosures needed to keep the general public from electrocuting themselves would take a serious effort to make. And still we must keep in mind that 10% of the general public. The truly tragic part is that the courts and legal system seem dedicated to the prevention of natural selection.

 

One approach:

The unit shown in the video is cute and it might survive serving a family. It would not last ten minutes in a public environment.

 

I also would look at the peristaltic pump solution, if you obtain the kind with stepper motor drive, it is very easy to meter it via a number of steps.
Max.

 

Amazon has this: and more like it.
Takes four AA batteries.

 

Amazon has this: and more like it.
Takes four AA batteries.

As in #2. Definitely a buy-instead-of-make, in my opinion. I can get one delivered to my door for under $30.

 

The three pumps that I have are functionally similar, but with 120 volt 60Hz motors and they are not nearly as muscular looking as the ones shown. And the connections and enclosures needed to keep the general public from electrocuting themselves would take a serious effort to make. And still we must keep in mind that 10% of the general public. The truly tragic part is that the courts and legal system seem dedicated to the prevention of natural selection.

I'm not suggesting that the OP just twist the wires together and nail the whole thing to the wall near the sink. A certain amount of consideration will have to be given to encasing the assembly in some kind of idiot proof casing. Even in domestic setting.

 

As in #2. Definitely a buy-instead-of-make, in my opinion. I can get one delivered to my door for under $30.

Yeah, I'm sure they can be found cheaper. I just did a quick search and picked one of the first few that popped up. There are lots on the market.

 

I'm not suggesting that the OP just twist the wires together and nail the whole thing to the wall near the sink. A certain amount of consideration will have to be given to encasing the assembly in some kind of idiot proof casing. Even in domestic setting.

Dummy resistant takes some effort, but actually idiot proof is very difficult to achieve.

 

If you want to go the peristaltic pump route, here's a pump and controller together, controlled via. a serial connection, should you want to get that complicated:

https://www.kr4.us/bartendro-dispenser-peristaltic-pump-and-controller.html

 

If you want to go the peristaltic pump route, here's a pump and controller together, controlled via. a serial connection, should you want to get that complicated:

https://www.kr4.us/bartendro-dispenser-peristaltic-pump-and-controller.html

It may also work to add a cam so that each push of the button delivers one revolution worth of the stuff. That could use some really simple control, logic. Just one relay.