DIY Vacuum Pump:
Invented by Otto Von Guericke in 1650 the vacuum pump has come a long way. The main function is to remove gas molecules from a sealed volume and leave a partial vacuum behind. Basically, it is used to pull out air and gases from a sealed or confined space due to which space is left out of any gas and air molecules. The vacuum pump functions by removing the molecules of air and other gases from the vacuum chamber (or from the outlet side of a higher vacuum pump if connected in series). A DIY vacuum pump is no longer a wish. It can be made easily at home.
Here is how you can make a DIY vacuum pump:
- Tubing cutter or hacksaw
- Drill with an assortment of bits
- Soldering iron and some 50/50 general-purpose plumbing solder
- 9/16″ wrench
- Pair of pliers
- 6 No. 8 X 1″ flathead wood screws
- 6 X 2″ threaded wood fastener
- 1/4″ pipe tee
- 1/4″ pipe to 1/4″ tube flare coupling
- 1/4″ pipe to 1/4″ hose barb
- 1/4″ male 45° permanent flare coupling
- 1/4″ X 2″ bolt with nut and washer
- 1/4″ stem 0-100 PSI pressure gauge
- A scrap of 2 X 4 about 32″ long
- length of bicycle tire pump hose
- Get an old fridge self-contained hermetic compressor. Remove the mechanism by unbolting its mounting platform from the refrigerator frame and cutting the coolant “feed” lines as far from the drive unit as possible.
- Find the suction hose with a large diameter and the uppermost 3/16” discharge hose. Trim the inlet line to about 6″ in length, and the outlet line to a foot or so, taking care not to collapse either conduit wall as you cut.
- Remove an 8″ section of 1/4″ O.D. flared-end copper tubing from one of the lines left in the main body of the cooler, if not then just 45° flare the tip of a scrounged straight piece of tube), and cut a 2″ stub off the “funneled” end.
- Slip the flare nut over this short segment, and—taking the remaining 6″ piece of 1/4″ line—prepare to fasten the small section to the pump’s outlet pipe, and the longer portion to its “draw” hose.
- Clean all the to-be-joined surfaces with some steel wool and a sliver of fine sandpaper, then solder the respective pieces together. Let it cool.
- Fasten the 1/4″ flare coupling to the exposed end of the vacuum tube.
- Assemble the remainder of the fittings by threading the flare coupling and the hose barb to the tee—on the “arms” opposite each other—and the pressure gauge to the junction’s third outlet.
- Use a thread sealant to prevent leakage.
- Solder the 1/4″ X 2″ bolt to the back of the tee fitting (the side to the rear of the gauge).
- Measure the length of the compressor’s mounting platform, and cut a section of the 2 X 4 to equal that dimension (the remaining scrap of wood can be trimmed to match the structure’s width). Rip the longer plank in half (on its broad side), then mount the pair of wooden skids to the frame’s base—and the crosspiece to its upper surface—by placing the 1″ screws through existing holes and into the wood.
- Drill a 1/4″ hole in the transverse support to hold the gauge and tee in place, tighten the flare nut to its coupling before mounting the brass components.
- Secure the motor’s electric relay box (a self-actuating safety switch) to the 2 X 4 with a 2″ wood screw, and attach the air hose to its barbed nipple with a clamp.
Your DIY vacuum pump is ready to be used. This vacuum pump is capable of delivering over 100 pounds of air pressure.
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