Questions tagged [vacuum-pumps]

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What is the difference between side-channel/regenerative/ring/vortex blowers?

I am looking to write a Wikipedia article for side-channel blowers, but I have some big confusions that are not being alleviated by my attempts at research. There are certainly two distinct ways that ...
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Vacuum Pump Oil Contamination

I have a vacuum pump that has water in the packing oil. This oil is function as a lubricant and sealant. I have changed the oil 2 times now and it still shows signs of contamination. Is this a telling ...
David Wisniewski's user avatar
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Suction hose or regular PVC hose?

I had a liquid filling machine to which on the suction side I had applied regular PVC hose Some time back I had a problem that after some use the hose was beginning to breathe air. How do I know it ...
John Snow's user avatar
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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 ...
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Calculation of work to create a vaccum

I am trying to calculate the work required to lower the pressure in a box from P1 = 1 bar to P2 = 0.1 bar. The box has volume V. Is this simply VdP work? If not, how do I perform an energy analysis to ...
ellekalle's user avatar
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What is the maximum vacuum level achievable from heating up a metal in a vacuum chamber full of oxygen?

if a chamber were to be completely filled with oxygen gas only (let's say atmospheric presssure in a 1L vacuum chamber) and a piece of metal, maybe iron or maybe steel wool, is heated so it oxidizes, ...
asker's user avatar
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2 answers
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How to calculate the required power to pump out (to vacuum) a container?

Consider I have a cubic container with its volume is 1m cubic as in the simple picture above. It is sealed nicely, it is air proof, no air leaking. I would like to pump out (to vacuum) the container ...
AirCraft Lover's user avatar
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How to build a hydraulic standing desk?

I am trying to build a standing desk but I want it to be wireless (aka - no electricity needed). My idea is: have 4 hydraulic pistons that extend (from 60 cm (25in) to 120 cm (50in)). They will be ...
Miro's user avatar
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How this centrifugal pump works in creating a vacuum?

Stumbled upon this video (vacuum fryer commercial) It obviously using 2 centrifugal pump (large ones, most likely above 700 litres/min) to circulate the water inside condenser But then, these pumps ...
mande's user avatar
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Are vacuum actuated artificial muscles as hard to control as the pneumatic ones?

I was searching for questions on this stack and I found this one asking why pneumatic/hydraulic artificial muscle robots aren't common, TLDR: the reason is that it is incredible hard to control them. ...
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Vacuum pump clanking, pulling oil into line

About 3.5 weeks ago I bought a new vacuum pump (VEVOR 8 CFM Vacuum Pump 2 Stage). It's started sometimes making a rattling noise for a moment on start, like this morning. I also had a problem when I ...
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Peristaltic pump design principles

We're experimenting with 3D printed vacuum pumps, and a peristaltic pump is the leading contender, being shown to reach pressures below 10^-1 Torr. We don't know much about peristaltic pump design and ...
Kenn Sebesta's user avatar
1 vote
1 answer
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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: ...
nwsteg's user avatar
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3 answers
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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 ...
Mac_79's user avatar
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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 ...
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How does fumed silica attain a panel shape when used in vacuum insulated panels?

VIPs are shaped like fairly-flat boxes - cuboids - thick rectangles, for example 20 mm x 400 x 600 mm. If manufacturing started with a sheet of styrofoam - a thick rectangle - I would not be surprised ...
Jonathon Neville's user avatar
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Which of these systems should reach a better vacuum?

I'm trying to find a cheap manual vacuum pump for a sample transportation container that carries oxidizable samples of thin-film magnetic materials. They already have a 15 nm Tantalum layer on top, so ...
user2934303's user avatar
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2 answers
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What contaminant materials should be avoided for reaching ultra-high vacuum?

This question relates to ultra-high vacuum chambers (order of ~10−10 mbar) in experimental setups. [This question was asked at physics.stackexchange.com but removed due to being more about engineering....
Thagusta's user avatar
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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 ...
dirkvwijk's user avatar
1 vote
4 answers
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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 ...
Nick LeeJy's user avatar
2 votes
1 answer
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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 ...
Joy Karmoker's user avatar
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1 answer
1k views

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'...
benjarojas's user avatar
1 vote
1 answer
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Vacuum Pump Specs

I have an airtight rigid chamber of volume V (~500 cu.ft.) I want to remove the air from the chamber such that the internal pressure is equivalent to some P absolute atmospheric pressure (eg 3.46psia) ...
Veldaeven's user avatar
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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 ...
Sargun Dhillon's user avatar
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Why can't I find a small vacuum fryer?

I'm looking for a vacuum fryer and so far the only ones available to buy are large, industrial machines. Is there some technical consideration that makes small scale machines economically unfeasible? ...
O James's user avatar
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Is the silicone oil used in a diffusion pump oil special?

I have obtained two diffusion pump stages from a pair of very old Vacuubrand high vacuum pump. The rotary vane pump in one of them was dead and another overheating. So, I salvaged only the diffusion ...
The_Vintage_Collector's user avatar
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Possible to suck water through manual bilge pump using a transfer pump?

I dug a shallow well (12' deep) on a remote off-grid Florida Property I own. The well is a simple 1-1/4 PVC Sand Point well I hammered in the ground. I then used a rubber coupler to attach a cheap ...
Hell.Bent's user avatar
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1 answer
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How do I increase negative air pressure without inhibiting airflow?

I would like to increase the vacuum power of my desoldering station. It’s a multifunction unit that includes a single vacuum pickup tool, hot air wand and desoldering gun. When using the desoldering ...
user148298's user avatar
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Increasing suction air flow with multiple pumps

I'm trying to build a small pick and place system using a suction cup and a 12V vacuum pump. The problem I'm having is that I'm not getting a good enough seal between the cup and the object, and I ...
John M.'s user avatar
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Are most vaccum pumps isothermal?

Because adiabatic processes would lead to a high temperature rise due to the high reduction in pressure (from 1 atm to roughly 0 atm).
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Energy required to vacuum a cylinder

I'm trying to calculate the energy per unit length the vacuum pumps require to vacuum a cylinder with a diameter D. Which formulas should I use? I used a typical formula for compressors and the ...
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1 answer
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deep vacuum in the 19th century

Nowadays deep vacuum pumps are fairly expensive, so I'm wondering: how could people reach the deep vacuum required for crookes tube or Geissler tubes in the 19th century ? (I'd be interested in ...
Manu de Hanoi's user avatar
1 vote
2 answers
2k views

Inlet/outlet of a fridge compressor

I'm attempting to convert a fridge compressor into a vacuum pump, but it got me confused. There should be one inlet and one outlet I believe, but instead I have three, with the third being connected ...
Peter Poláček's user avatar
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3 answers
82 views

Vacuum Pump Issues

I seem to be having an issue with my little vacuum chamber I am building where I can only reach a base pressure of 6,000mTorr which is pretty high and am trying to figure out what is wrong. I have a ...
Matt's user avatar
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2 votes
1 answer
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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 ...
joe blogs's user avatar
2 votes
0 answers
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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 ...
Matt's user avatar
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Proper way to power/use a vacuum cylinder?

I'm considering using a vacuum cylinder in my project (like these ones) to lift sheets of cardboard, but being new to mechanical engineering I'm not at all sure what I need to attach to operate one, ...
IronWaffleMan's user avatar
4 votes
2 answers
252 views

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 ...
James Elder's user avatar
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2 answers
66 views

Vacuum vessel at 10mbar with a diaphragm pump: do I need a venting valve?

I'm working my way through learning vacuum technology. I have a 10l vessel which I want to evacuate to < 10mbar. I'll use this diaphragm pump. Do I need to add a (manual) venting valve to the ...
Cedric H.'s user avatar
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2 votes
3 answers
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Transfer pump suitable for air, water and their mixture

I need a pump that can remove water from certain volume (~300ml). Water mixed with washing agent (soap) is pumped into this volume using another pump ~5-20L/minute. This volume is not completely ...
wonder.mice's user avatar
2 votes
2 answers
4k views

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 ...
Transistor's user avatar
12 votes
1 answer
378 views

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 ...
dominecf's user avatar
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