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A Homemade Pump. Yes a Pump, not a cylinder.

I have a few components on the way for further testing and will post results here.

Another thread (started in 2011) which is helpful is:
$15 electric vacuum pump for anyone!

A fundamental decision in designing pumping systems is what power (voltage) to use. Typically in industrial applications low voltage (5V, 6V, 12V, 24V) is used for controls and high voltage (120V, 240V) is used for motors. It is possible to build a pumping system that is all high voltage (see the ideas earlier in this thread) or a system that is all low voltage (12vdc). A high voltage system will usually cost more than a low voltage system.

For our purposes we simply do not need the powerful aspects of high voltage. For example, the vacuum pumps mentioned earlier in this thread are capable of 25+”Hg at 4+ amps 120VAC while a low voltage vacuum pump might pull 15”Hg at 0.5 amps 12vdc. The difference will be that the high voltage pump will move more air faster, especially at higher levels of vacuum - which we really don’t need. High voltage pumps and controls are more expensive - about 5-10 times the price of low voltage products.

Finally finished the pump

Been a while

Did make a pump

Bought some used stuff some new

About $250. Invested

The timer and relief valve is industrial on off from seconds to 60 minutes

Works great but it is louder than I would like

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Cruzing - good job and thanks for your post with pics.

You have obviously chosen to use line voltage and high quality industrial parts. I especially like your attention to details like the muffler on the flow controller (min pressure valve) and liquid filled gauge.

How did you mount the timer - to what and how is it attached? I see the socket and the module. For people who may not be familiar with the module used here, it is a repeat cycle timer that plugs into a standard socket for wiring. The modules are available in various ranges such as seconds and/or minutes.

What is the timer controlling? Is the timer just controlling the relief valve? If so, is your pump running all the time?

A schematic might be helpful to anyone wanting to build a similar system. Also helpful would be a parts and vendor list. You have already done a great job by taking time to post pics!

Unfortunately, I don’t have any solutions to the sound problem other than using a box lined with foam over the entire system. Cardboard and open-cell egg crate foam (mattress topper) - use spray adhesive to attach the foam to the inside of the box. However, heat build-up within the box can be a problem. Typically these vacuum pumps have thermal overload protection and when they get too hot they shut down. I suppose you could put a temperature probe in the box to alert you to high temps.

My latest pump project is awaiting parts from China - must be on a slow boat!

Originally Posted by mo1258
How did you mount the timer- to what and how is it attached?

Right now it is temporally mounted with zip ties and tape to the handle

For people who may not be familiar with the module used here, it is a repeat cycle timer that plugs into a standard socket for wiring. The modules are available in various ranges such as seconds and/or minutes.
The timer is a omron
OMRON H3CR-F8-300AC100240
Specifications
Repeat Cycle Timer, Coil Voltage 100-240 VAC, Contact Form DPDT, Contact Current Rating Resistive 5 Amps, Maximum Time Range 300 Hours, Minimum Time Range 1.2 Seconds, Pins 8,

Originally Posted by mo1258
What is the timer controlling? Is the timer just controlling the relief valve? If so, is your pump running all the time?

The timer is to switch the valve for lower pressure setting
The valve is normally closed ( meaning closed until power is applied )
The pump runs constantly

Originally Posted by mo1258
Also helpful would be a parts and vendor list.

Most parts were bought used E*AY
Just waited to get them cheap

The vacuum pump,
Most people don’t look for aspirator pump which is the same thing
But you can buy them cheaper

Originally Posted by mo1258
A schematic might be helpful to anyone wanting to build a similar system.

See pic for wiring
Any other ? Just ask

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Last edited by cruzingratiot : 10-17-2013 at .

The top side of switch red side pos right 2neg left 2

The bottom pos right side, neg left side

The out side posts top bottom operate the vacuum release seloniod

The two top center wires + - power the timer switch

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