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seals would still be needed to keep air out. i think this already exists, as you demonstrated. what application would this have? |
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//I assume a vaccum is made with multi-stage pumps to evacuate a vessel //
Wrong - they bring a few un-gallons back each trip with the Shuttle. |
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So, basically, a stirrup pump? |
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It took a few reads, but I get it. You have a cylinder with one way valves at each end. Inside the cylinder is a piston moved by external magnets. You bounce the piston back and forth pressurizing one side then the other. Each time a side gets pressurized the excess gas gets pushed out the one way valve on the ends. |
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I like it (+). You bounce the free piston at resonance to produce the force to pump out the gas. Add in extra one way valves from the vacuum chamber to bleed in air as it is pumped out and you would get a very quick vacuum pump. I like this a lot. |
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Maybe put twin cylinders side by side with opposite piston motion to cancel out some of the vibration because I think you'd want to use a heavy-ish piston. |
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[MB] Yes, a magnetic induction, resonance, free piston stirrup vacuum pump. |
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I'm curious about the intended use for the vacuum. The reciprocating piston would seem to prevent anything useful from being placed within the cylindar (at least before completion of evacuation.) |
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Why do you need to evacuate both sides? Just latch the plunger. (And, as csea says, what do you do with it since you can't get anything into it.) |
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//Why do you need to evacuate both sides?// So you don't waste a stroke. |
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The way I read it, there's only one stroke needed. |
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I am unclear as to why this application would in some way eliminate the need for seals on the piston. How is this really any different than a normal piston vacuum pump? FWIW most vacuum pumps are of the rotary type and have small chambers so that they do not require excessively large power supplies, the larger the chamber the greater the amount of force needed to move the piston. One of the most common types in use is a rotary vane pump which has the benefits of being Oiled and having an wear accommodating seal which allows for long life and cool operation with minimum wear. |
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Your closing question is kind of pointless as you would require the exact same amount of energy to pull a vacuum as any other sort of pump as the energy is consumed in making the vacuum and not in the piston moving. The different types of pumps simply use the energy more or less quickly(your pump uses it very quickly, a rotary vane more slowly) |
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//once a vacuum is formed on both sides how much energy is needed to move the plunger ?// |
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Depends on the mass of the plunger, how far it's moved and how fast, and what friction is present. |
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The only savings of it being in a vacuum is that you are no longer doing additional work to compress the air / evacuate the tube. |
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My initiating idea was the idea of trying to make a space where there wasn't a space before .
A 'sealed' structure that increases in volume . |
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I admit the seal of piston (wall) would be the problem.
I thought the cylinder would only need one stroke but like all cleaning there always alittle bit left over . |
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A central inlet on the cylinder would allow the cylinder as a source of vaccum .
If the cylinder was mounted on a car combustion engine cylinder then the volume and therefore the compression could be fiddled with (diesel/petrol mix anyone) |
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Isn't it fun to imagine what bleeds through the atomic crystalline structures to fill up that space .
I wonder what a boiled off free electrons look like in
in this enviroment . |
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//[MB] Yes, a magnetic induction,
resonance, free piston stirrup vacuum
pump.
// |
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Aha! MrQED, I'm indebted to you for
clarifying the idea. And, once
explained,
it's ingenious! |
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You could even make this a "shakeable
pump", capable of hand-held use, for
creating very high vacuum easily by
hand. |
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Maybe I made this into more than it originally was, but I really liked it when it was done. Vacuum pumps are usually designed for low volume and high pressure, this pump could do both as long as you used a long enough slide. |
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It would start out slow pushing the piston back and forth and as it gained speed, it would gain stroke length then vary the amplitude by the air bleed into the system. |
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I always liked free piston engines and this seems like a good application of the idea. |
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[wjt] all you need is to place a linear array of speaker-like metal bellows of increasing capacity along the length of the cylinder to create high vacuum pressure by differential activation. Each of the electronically activated, synchronized, vibrating bellows have their own valves to seal off each chambers after the evacuation stage, then the exhaust valve is then closed, and the bellows eased down. |
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