Questions tagged [vacuum]

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Need Ideas: Sci Fi Handgun designed not to over-penetrate spaceship hull [closed]

TLDR: what kind of personal projectile weapons would you expect to see used in a pressurized space station in the near future, something that can have useful terminal effect on a person within 25-50 ...
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1answer
24 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? ...
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12 views

Can a maglev propelled hyper-loop carrying a 30 tonne load travel at 27 000km/h [closed]

a) Can a maglev propelled hyper-loop carrying a 30 tonne load travel at 27 000km/h here on earth and... b) would the forces acting on the materials and its frame render one such structure impossible ...
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9 views

Looking to apply very specific amounts a vacuum to a small chamber in fractions of inches of mercury to manipulate a diaphragm.

I was considering having the container sealed with a one-way valve to apply the vacuum. I then considered that I might have a vacuum Supply chamber connected between the vacuum generator and the ...
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17 views

Proper name for this weld adapter/sleeve/stub

I'm studying the design and construction of viewports for vacuum systems. Usually, the window is bonded to a welding ring, which is then welded to a stainless flange. (See the cross section below for ...
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17 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).
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16 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 ...
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35 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 ...
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63 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 ...
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18 views

Which diffusion pump oil specification indicates pump temperature for max vacuum?

Of the diffusion pump oil specs listed below, which indicates the temperature the diffusion pump needs to operate at for maximum vacuum pull? Flash Point, Open Cup: 220°C Boiling Point @ 0.06 ...
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19 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 ...
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17 views

Technical name for vacuum float liquid shutoff valve?

I am working on a "maker" hobby project involving a vacuum/blower motor. I want to make sure that if the suction pipe is accidentally (or intentionally) placed in water that the liquid will not be ...
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28 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 ...
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1answer
66 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 ...
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1answer
39 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 ...
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2answers
47 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....
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2answers
662 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 ...
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16 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 ...
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2answers
166 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 ...
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3answers
54 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 ...
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2answers
60 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 ...
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1answer
42 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 ...
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54 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 ...
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2answers
93 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 ...
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1answer
202 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 ...
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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, ...
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4answers
147 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 ...
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2answers
79 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?
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2answers
183 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 ...
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3answers
697 views

How to design a vacuum climbing robot

I'm trying to design a mobile robot which has to climb over flat 60° inclined wet glass surfaces. I was thinking to use a large vacuum system composed by a large fan connected to a brushless motor. ...
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2answers
40 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 ...
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1answer
39 views

Are “Imperial Eastman” compression connections sized the same as regular imperial connections?

I have some high pressure and vacuum lines off of a tool from the 1980s and they are labeled as, for example, "3/8 imperial - eastman," which seems to be different from how normal compression ...
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2answers
108 views

PD pump type for vacuum liquid extraction?

I would like to learn what type of positive displacement pumps are used to remove liquids from vacuum applications. I have been searching for an example application, but it seems to be a rare case. ...
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1answer
102 views

Liquid Vacuum Filler machine using Venturi Pump

We are currently using a liquid vacuum filler machine that vacuum fills nail polish. There is a Gast 1/4 horsepower motor and a Gast rotary vane pump that according to the gast website pulls 20" of ...
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1answer
34 views

What are some concepts I can look into to aide in creating a 'compression funnel'(?) without the aide of a motor? [closed]

In short I'm designing a 'Humane fly swatter' for my University application into bachelor of Industrial Design. The idea is to utilise the energy of swatting a fly to capture air through an intake, ...
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2answers
2k 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 ...
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1answer
2k views

Vacuum Pump hg" vs Pa units?

I need a vacuum to provide 21" Hg but looking online many list an ultimate vacuum of 10Pa but 1"Hg = 3300Pa? I know I am missing something and just want to make sure I get it right. Thanks for the ...
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2answers
994 views

Series O-ring in Vacuum Application

I am working with a piece of equipment that has a vacuum sealed chamber. The outer wall (ring) of the chamber is shown in the image below. This ring is bolted to a bottom plate and a top plate is ...
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1answer
382 views

How to protect a pressure gauge from condensation in a vacuum steam boiler?

Pressure gauges are protected from steam condensation in a regular boiler by using a siphon where steam condenses and prevents steam from going further up to the gauge. However in a vacuum steam ...
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1answer
243 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 ...
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1answer
55 views

Spreading vacuum load using stacked perforated sheets

I am thinking of playing around with food in partial vacuum conditions (ie water boiling at room temperature). But, as it is more a curiosity, I'd rather not spend too much money right now. That ...
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1answer
432 views

What options are available to create a vacuum with hydraulics? [closed]

What options are available to create a vacuum using hydraulics? I am working on constructing a small planter which needs a vacuum to operate. Planters operate best at a pressure of 10 PSI. I ...
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1answer
189 views

Are ABS/PLA too volatile to be used in cryo vacuum?

I need to use a custom part inside high vacuum (cryo vacuum), for example as a shadow mask. If PLA/ABS are not volatile, I could just print the part I need. The question is, are ABS or PLA too ...
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1answer
305 views

How thick does an aluminium vacuum cylinder have to be?

Take a hollow aluminium cylinder with outer radius $r$ and length $h$, capped with two circular endcaps. How thick does the aluminium have to be, that is what is the inner diameter of the cylinder, ...
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45 views

What is the reason for the instant loss of a vaccum through the sealed glass tube after shuting off a pump? [closed]

A pump is connected to a glass tube to evacuate it. The reading shows 0.4 mbar when the pump is on because of a vacuum. As soon as the pump is turned off, the pressure in the tube becomes equal to ...
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1answer
7k views

Vacuum Pump Power Calculation

This may be a silly question, but I'm not a mechanical engineering. What's the best way to calculate the energy required to reduce the pressure of a gas stream below atmospheric pressure? Obviously ...