Questions tagged [vacuum]

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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 ...
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1answer
19 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 ...
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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 ...
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2answers
18 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 ...
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25 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 ...
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2answers
557 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 ...
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1answer
42 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 ...
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2answers
285 views

Why do Nescafe's (and others'?) instant coffee jars have an inner seal with no “grip” for easy removal?

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 ...
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1answer
45 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 ...
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2answers
67 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 ...
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1answer
32 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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10 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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19 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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18 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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0answers
17 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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36 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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0answers
88 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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21 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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0answers
45 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
68 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
55 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
56 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
1k 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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0answers
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
436 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
57 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
63 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
49 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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0answers
55 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
94 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
251 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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0answers
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
170 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
98 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
202 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
876 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
47 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
40 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
120 views

What type of positive displacement pump is used for vacuum liquid extraction?

I would like to learn what type of positive displacement (PD) pumps are used to remove liquids from vacuum applications. I have been searching for an example application, but it seems to be a rare ...
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1answer
123 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
1k 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
448 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
285 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
59 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
556 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
205 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
345 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, ...