Questions tagged [vacuum]
The vacuum tag has no usage guidance.
67
questions
0
votes
1
answer
29
views
what is the purpose of the fiberglass mat we get with some vacuum chambers?
I just bought a vacuum chamber which comes with a little square weaved fiberglass mat with some silicone rubber on it's border, and I can't find any information about it's use. Even in the comment ...
- 127
0
votes
1
answer
9
views
How does the total pressure detector in a quadropole mass spectrometer work?
All quadropole mass spectrometers that I have seen provide a total pressure reading in addition to partial pressure readings for the selected masses.
The mechanism of the total pressure measurement is ...
- 11
0
votes
0
answers
35
views
What type of sealants are used to seal vacuum chambers?
I'm building a vacuum chamber and I want to seal it
It's a 200mm^3 acrylic box
What type of sealant should I use?
For the door I guess it has to be something else then the walls because it need to be ...
- 101
0
votes
1
answer
45
views
Vacuum effect in ansys
May i define vacuum as a negative pressure in ansys? This boiler tested for vacuum of 1520mbar.
- 1
1
vote
3
answers
66
views
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 ...
- 111
0
votes
0
answers
19
views
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 ...
0
votes
0
answers
45
views
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 ...
- 121
0
votes
1
answer
59
views
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 ...
- 1
1
vote
0
answers
19
views
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 ...
- 11
3
votes
2
answers
61
views
Reverse Suspension Spring
So, in a car either a liquid or a gas gets compressed when force is applied to the suspension, and when the force is removed the gas/liquid tries to expand again which makes an effect like a spring,
...
2
votes
1
answer
85
views
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 ...
- 21
1
vote
1
answer
166
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'...
- 13
1
vote
1
answer
31
views
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)
...
- 113
1
vote
4
answers
85
views
Can a vacuum in a room increase the pressure in a tube?
Ok, So I work as a Marine Engineer but I do not have an engineering degree so I am having a hard time wrapping my head around this problem.
So currently on my ship we had a minor spill overboard from ...
- 111
0
votes
0
answers
34
views
Using a thermos flask as a vacuum chamber
I want to create a vacuum chamber (-900 mbar) that can withstand heat (120°C).
I thought about using a pressure cooker similar to most DIY vacuum chambers, but then thought about using a large food ...
- 101
0
votes
0
answers
21
views
How to sanitarily measure vacuum in milk?
I would like to measure the vacuum inside of a tube which will contain air and milk. A vacuum pump attached to the tube will maintain a vacuum of around 15 inHg.
Are there inexpensive sensors I can ...
- 101
-1
votes
2
answers
42
views
Is it possible/practical to mold a single hollow piece of carbon fiber with a sealed vacuum in the middle?
Let's say I design a simple piece of carbon fiber to be manufactured, in the shape of a simple cylinder with a diameter of 2cm and a height of 3cm (pretty small).
Is it possible and/or practical to ...
- 101
1
vote
2
answers
52
views
Diffusion Pump Copper Cooling Coil Repair
I bought a Varian VHS-4 oil diffusion pump off of ebay about a year ago. The pump was stored outside by the people I bought it from so it suffered mostly cosmetic issues. Recently I have acquired all ...
0
votes
1
answer
27
views
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 ...
- 158
4
votes
0
answers
58
views
Need help identifying this vacuum chamber flange
I know this might not be the most ideal place to ask this question, but I couldn't think of any place better.
I recently purchased a high vacuum chamber setup and have been disassembling it for ...
- 41
1
vote
2
answers
497
views
Can I use a NPT fastened device to vacuum or 10^-2 Torr?
I am designing a flange to be use to maintain a pressure of 10-2 Torr for at least 3 months. I am using an o-ring seal from my (device) to the product weldment. I am looking for feedback on using NPT ...
0
votes
0
answers
59
views
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 ...
- 1,033
3
votes
2
answers
923
views
What is the equivalent of a capacitor in pneumatics?
I am building a desoldering gun. While the pump I am using provides decent suction, I would like a quick powerful vacuum burst to prevent the solder from solidifying in the nozzle rather than in the ...
- 158
0
votes
1
answer
49
views
Does a pump like this exist?
I have a need for a pump that can suck a vapor from a 0.1 atm environment, and flow into a 1 atm environment. I know that there are electrical pumps that can do this. But are there any pumps like this ...
- 11
-2
votes
2
answers
1k
views
Why do Nescafe's (and others'?) instant coffee jars have an inner seal with no "grip" for easy removal? [closed]
For a number of years now, I have been buying instant coffee products. Since the main brand has been Nescafe, this question is specifically about their products, even though I vaguely recall that the ...
0
votes
1
answer
350
views
Calculating the Thickness of a Glass Tube which contains a Vacuum
I am looking for borosilicate glass tubes which can be used to contain a vacuum, so the top is sealed and then there is a vacuum pump at the bottom where the edges are also sealed, effectively making ...
- 103
1
vote
2
answers
73
views
How fast could a Mini Cooper go in a vacuum?
Lord Evulz just stole the Earth's atmosphere. Our hero must race his trusty old Mini - which he had already prepared to be airtight, to ensure the tires do not explode, with pre-packaged oxygen to ...
- 113
0
votes
1
answer
37
views
what is the most optimal cost effective diameter of a hyperloop tube ferrying ALL cargo between the US and EU [closed]
what is the most optimal cost effective diameter of a hyperloop housing vacuum tube housing hyperloops that can ferry ALL cargo currently travelling by air and sea to and from the US and Europe? ...
- 111
1
vote
0
answers
32
views
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).
user20096
2
votes
0
answers
18
views
Parts needed for controlling vacuum line pressure with pressurized nitrogen
I'm trying to assemble a simple setup where a line which is typically under vacuum can be pressurized by an external nitrogen supply, with this pressure regulated to less than 1 bar absolute (let's ...
- 21
0
votes
0
answers
39
views
Is it possible design a portable high powered vacuum cleaner from a 12V DC motor?
I am currently designing a device that can pick up 20 kid's plastic balls from one box and transfer them all into another box. I have decided to use a vacuuming method to vacuum up the balls as my way ...
- 1
1
vote
0
answers
113
views
Solid-liquid separation of a crystal slurry
Let me preface my question by saying I am a recent chemical engineering graduate and apologize if my inexperience shows.
I have designed a batch process which results in a water slurry stream ...
- 125
0
votes
0
answers
24
views
giga/tera hertz timer? super fast spinning disc?
How would I go about detecting a very small amount time dilation
I want to accelerate something and measure the time dilation even if I reach 1km/s time dilation is very small but it looks just ...
- 1
2
votes
0
answers
111
views
Dense, non-conductive UHV compatible material?
I'm not sure if this sort of question is appropriate here or not so please let me know if not!
I am designing a UHV vacuum system with a few interesting requirements. Inside of the vacuum chamber ...
- 123
5
votes
1
answer
72
views
Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)
I am preparing a classroom demonstration about heat, including a demo of how a satellite loses heat only radiatively, since it's flying through a vacuum. I'd like to make the vacuum-production ...
0
votes
1
answer
62
views
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 ...
- 241
1
vote
2
answers
128
views
Low cost feedthrough for an acrylic vacuum chamber
I am currently building myself a "hobby" vacuum chamber from 1 inch tickness acrylic sheets (I am very aware that acrylic is not the proper material). Inner dimensions of the the chamber is 40x40x40mm....
- 13
3
votes
2
answers
3k
views
What's the difference between a vacuum regulator and pressure regulator?
When browsing through pneumatic parts, I notice that some vendors specify different components for pressure regulator and vacuum regulators. SMC for example does this.
I'm curious why vendors would ...
- 209
1
vote
0
answers
20
views
Matching Output of Two Old Ring Compressors using Larger Single Unit
Disclaimer: I am new in the design of any fluid systems, however the selection of these units is critical for the electrical design I am responsible for this system, so please excuse me if my approach ...
1
vote
2
answers
1k
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 ...
0
votes
3
answers
65
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 ...
- 31
1
vote
2
answers
74
views
Usticking two glass elements fused by vacuum
I have an interlocking set of parts (1 and 2) which are used under vacuum. The last time I used it, the interface was wet with a mixture of water and ethanol. When the vacuum was removed, the two ...
- 111
2
votes
1
answer
55
views
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 ...
- 23
2
votes
0
answers
63
views
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 ...
- 31
6
votes
2
answers
110
views
Could a vacuum tank ever be light enough to be boyant in air?
Given futuristic materials, could a structure ever be strong enough to contain a vacuum, yet light enough to provide buoyancy under standard atmospheric pressure?
Obviously "futuristic materials" is ...
1
vote
1
answer
444
views
How to backfill vacuum chamber with low pressure gas
I have a vacuum chamber that I would like to backfill with 15 mTorr of argon. The problem with accomplishing this is that most pressure regulators can't do pressures that low. Are there regulators ...
- 400
1
vote
0
answers
28
views
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, ...
- 111
0
votes
4
answers
250
views
How to quickly equalize pressure in a low pressure container?
Background: This is for a science project I'm creating where I use an airpump connected to a sealed 5gal pail bucket to create a vacuum. That vacuum is then connected to water source to "suck" liquid ...
- 1
1
vote
2
answers
124
views
How does electricity flow through this kind of vacuum tube?
Does the current flow from the bottom left pin to the bottom right pin, or from the bottom pins to the cap on top?
- 13
4
votes
2
answers
246
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 ...
- 141