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Questions tagged [vacuum-pumps]

43 questions
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Replace mercury with silicone oil in diffusion pump

We have obtained an old mercury-vapor diffusion pump for high vacuum. However, we do not want to operate it with mercury in our lab due to health concerns (which is presumably the reason it was scrapped by the original owner). Instead, we plan to…
dominecf
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Arduino CNC - which vacuum pump?

I have an arduino powered CNC machine with the Protoneer v3.00 shield. I have a probe setup for auto levelling which works correctly, I get a depth map for the board. But the issue is that this depth map is created to the point at which the bit…
James Elder
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Is there a good way to passively dry air in the input of a vacuum pump?

I'm using an a/c compressor as a vacuum pump for small projects that don't need a good vacuum pump, and I'm looking for a way to dry the air in the input, to prevent water from mixing with the oil inside. One way would be using a Peltier cooler and…
user2934303
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How can I make a vacuum pump to move rocks from one place to another?

I am trying to build a vacuum pump by myself and move rocks from one place to another. After some online search, I came across this video on Youtube. I am trying to build something like this. Can anyone explain the science behind it and tell me how…
Joy Karmoker
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1 answer

What kind of solenoid valve should I use for vacuum?

I'm currently working on a project in which I have to control 2 solenoid valves with arduino to switch the suction of a vacuum pump from one tube to another one (tried to explain it on the photo), I've tried one of those pneumatic 3/2 valves but it…
benjarojas
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How problematic is it to run vapor saturated liquid through a scroll pump?

I see that scroll pumps often have "Vapor ratings" of something like N Liters of water per hour. I know in rotary-vane pumps, it's a big no-no to run any kind of vapour through them and you need a cold trap. On the other hand, I know you can run…
Sargun Dhillon
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What is the formula to work out time to remove water from an open vessel with vacuum?

We have an open container sitting at 1000mm off the ground and a receiver tank sitting one metre above it. Container holds 400l of water and is connected to the receiver by 80mm id pipe. I was planning on using extraction fans sitting in the open…
joe blogs
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Generating a plasma via induction coil

I am trying to see if I can generate a plasma from an induction coil that is wrapped around a glass jar under vacuum. Tons of induction coil heatering circuits are on ebay for forging that can supply up to 1000W and operate at a frequency of 100khz.…
Matt
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How to regulate a vacuum pump?

I need a vacuum pump to provide at least 21" Hg of vacuum. Looking at the cheap rotary pumps on ebay, this one seems to be way more than fit for the job. Is there a way though I can regulate it though to provide lets say around 15-20" Hg? This isn't…
Transistor
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Selecting a vacuum pump for medium/low vaccum (~1000Pa)?

I have selected a lot of pumps/fans/compressors, but for low to medium vacuum (~1000Pa) the kinetic theory of gasses dominates and additionally there are many different types of less encountered pump technologies to select from. How would you select…
ericnutsch
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Vacuum Pump Oil Backflow Prevention Mechanisms

How do rotary vane vacuum pumps that prevent oil backflow do so? It does not seem like they use check valves since check valves require a differential pressure drop to be effective and the rotary vacuum pumps are capable of pumping a vacuum below…
DKNguyen
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Can I use a standard HVAC rotary vane vacuum pump to draw a vacuum on a sealed chamber?

Background I have a beginner question concerning rotary vane vacuum pumps like this one: VIVOHOME 110V 1/3 HP 4CFM Single Stage Rotary Vane Air Vacuum Pump Here are the pump specifications: Voltage: 110V Free Air Displacement: 4CFM Ultimate Vacuum:…
nwsteg
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How do vacuum sealers work on a glass jar?

I came across this video and I don't understand how a vacuum sealer works on a sealed glass jar. In the video, you can see the glass jars are closed tightly with a lid. In this case, how does the air inside the jar get sucked out to create a…
Mac_79
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Extrapolating compressor curves for varying pump speeds

I'm currently working on modeling a vacuum system in which a pump is present. the pump is driven at a varying speed $\omega$. The manufacturer has only given the characteristic curve at a single speed $\omega_{ref}$, which is well-approximated by a…
dirkvwijk
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Balancing suction air flow at different areas on pipe

I have a T-shaped pipe that is connected to a vacuum pump. Along one side, there are 4 areas of 9 holes where air will get sucked in from the surroundings. It's used to pick up some small objects. The problem is the 2 areas of holes that are closer…
Nick LeeJy
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