How to Make a Venturi Vacuum Pump?

Giovanni Battista Venturi was an 18th-century Italian polymath who did many unusual things. He was an ordained Catholic preacher, a university mathematician, one of the foremost engineers of his day, a politician and a legislator (and a favorite of Napoleon Bonaparte), and a world-class historian. It was Venturi who first paid attention to Leonardo da Vinci’s scientific contributions. Perhaps his most significant influence, however, came from his tracking research on liquid mechanics. His discovery of the Venturi effect – something eponymous physics he first described – is the basis for many essential differences today, from paint sprays to fertilizer installers to gas grills to scuba controllers.

In his 1797 book, Father Venturi described how the movement of one liquid “can stabilize the movement of other liquids, through a process called the equation of fluid.” For example, Venturi found that air or water blowing through a pipe drain could draw water magically and evenly from a second pipe if the geometry of the pipes were correct.

Venturi did not understand the reasons for this event, now known as Venturi. But it is easily explained today using the critical law of the liquid machinery known as the Bernoulli equation. Without going into the calculations, we can say that the fluid under pressure and the speed of the pipeline are slowly decreasing. That is easy enough to understand; since the number of fluid molecules in and out of a pipe remains constant, fluid molecules must accelerate to pass through that concentration.

Venturi’s understanding was that the faster the liquid, the same time the pressure of the liquid decreased. Therefore, if you measure the pressure in various places in the piping system, you will find that it is much lower when the speed and density of the pipes are very high.

Air Compressor as a Vacuum Pump

I liked to employ my air compressor as a vacuum pump. For more details on how that works, see the wiki article on Venturi Effect. I did it at my house. I put up with a chunk of aluminum measuring 1.25×1.25×3 “. I only went to 3” because the longest mill of 0.75 “I have gone to 2” depth. Keep in mind; the long extraction phase will provide a powerful vacuum.
To use the standard 0.25 “NPT shop counter, use 7/16” slightly. Drill one hole at the end with a depth of 0.6 “. Drop the other end at a depth of 2” using the last mill of 0.75 “. 0.2 “in the middle of 1. Drive to the hole made by the 0.75 “end mill.

Now, moreover, start at the end of the “hole” and measure 1.78 “. This is the center point of your next hole. Call this 7/16” bit. Stop when clearing the 0.75 “hole wall. Do not pierce the other wall.
The next step is to tap the holes. Insert the block into the pin and secure it securely. Take your 1 / 4NTP tape and carefully cut the hole. It’s best to use lube & go back regularly to clear chips. Do the same in another hole. You are now ready to install the instant disconnection feature. Be sure to use Teflon tape.
Once you have reached this point, you can test the rig. The hook is a horizontal QD suitable for your store in the air. If you put in enough air pressure, you will free up space at a specific rate. You can check the effectiveness of this setting by connecting the gauge to the vertical.

Making a Venturi-Style Vacuum Pump

The discovery of Venturi can also be used to make a simple but effective pump. While there are many types of opening pumps (read about the Magdeburg Hemispheres and how to do it) Venturi-effect pump is the simplest.

For this type of Remaking History, you will pull out a vacuri-based vacuum pump for less than $ 25. Open pumps are excellent scientific tools and lend themselves to a variety of exciting trials.

Warning:

You will need an air compressor to accelerate the air through the venturi, and air with high pressure must be handled with care. Use your compressor according to the manufacturer’s instructions and wear protective helmets.

If you paint a vacuum in a container, atmospheric pressure can cause it to leak. For plastic soda bottles, that’s pretty good. For some things, it’s not so good. If you put your pump in a glass flask or bottle, make sure it is strong enough to hold air space.

Step 1: Eliminate the Tee Fitting.

Remove the cleaning module from the plastic housing of the pump. Start by using a constant indicator to remove the male air connector, and then remove the tee fit into the copper nipple.

Step 2: Remove the Housing

Use a screwdriver to open the plastic housing. Remove the hose and dispose of it.

Step 3: Reattach

Re-attach the appropriate and industrial air connector to the venturi module. Use a rope tie to the ropes and tie it to the floor to prevent any leakage.

Step 4: Close and Secure

Carefully work one end of a soft plastic tube over a small piece of string inserted into the nipple of the pipe. Safely protect the larger balance with a given paint.

Step 5: Install the Hose Barb.

Insert the hose barb to the other end of the soft tube.

Performance

To use the pump, connect your air supply to the pump air supply. Set your air compressor release pressure between 70 and 90psi. The higher the pressure, the higher your pump will pull. At 90psi, I found a 24 ″ vacuum of mercury (in Hg), equivalent to 11.79psi or 0.8 atmospheres. That’s a lot.

Bottom Line

What will you do with your rest pump? Science! The most straightforward test is to drill a hole in the lid of a plastic soda bottle and insert a hose barb while the pump is working. It’s incredibly satisfying to put bottles in and watch them return.