The compressor inside the compressor breaks the noise barrier-gunaiyou

Providing compressed air in the workshop can be very helpful. However, owning a compressor is not a joy, because unless it is a very expensive model, it will be one of the noisiest parts of your equipment. Is there a solution to the problem of noise in the overhead line other than placing the compressor outside? [Dominik Meffert] may have found a stand for his CNC plasma cutter in the form of a quieter refrigerator compressor parallel to the receiver.
Of course, the use of refrigerator compressors in the workshop is nothing new. In fact, such devices are even commercially available as compressors for small applications such as nebulizers. But we’ve never seen so many at the same time. It’s not entirely clear how he manages to change any lubricating oil that got into the filter, we want to safely dispose of the coolant, but we can see that he’s up to something.
Refrigerator compressors have been here many times over the years, and not just for compression, we’ve even seen one of them as an engine. They are not always as strong as they should be.
Technically, you can just buy a complete unit without refrigerant, often sold as a replacement, or even buy a product just for that purpose. Note that they are very different and structured differently depending on things like your target market. Plus, they have so many different names for the same product. So be sure to check that you are ordering what you really want.
The downside to this is that you will need to install everything yourself with the right equipment and coolant etc. It’s not difficult, but you must own or use moderately priced equipment, and you must adhere to certain requirements, such as vacuum everything well etc. Some refrigerants used today are highly flammable. Besides being bad for the environment, on top of that, it’s also starting to get quite expensive. All Class 3, Class 2 and Class 2L refrigerants are highly flammable. R32, R290 and R600a are potential hazards.
The other part here is that the compressor tank looks like a cargo superport. Owned many years ago. Not recommended. Not sure what the maximum pressure this unit can put out in general (6 bar or about 87 psi seems to be) but at least they have a relief valve installed. Of all the things to save money on, neither this nor a quality compressor tank will save you a few bucks.
Can’t say electrically, but they use a lot of power so keep that in mind. They also get pretty hot if they work well enough. Let’s say about 2 minutes and 15 seconds to add water from a possibly empty tank.
How about CFM numbers here? Why are so many blocks connected in parallel? Less work time? How much energy do they use while running? How does it compare to your average (and frankly, usually very loud) compressor?
Agree with the filters here too. Not sure how they lubed it, but presumably it was added when they set them in parallel correctly?
Finally, each compressor produces a different pressure, and some newer compressors produce over 150 psi or so. Looking at you, R410-A. What is the output pressure here? What is the maximum rating for plastic tubing used? How well do they actually seal compared to soldering copper? How chemically resistant are plastic pipes to refrigerants/lubricants?
Interesting idea, by no means an expert here, so if anyone has anything else to share, please let us know!
Doesn’t it seem like their intention is that they suddenly want to use them as refrigeration compressors? They still need lubrication to work (for a while), while air compression and fluids are not needed (almost the same, anyway). They generate heat during operation, but usually have large cooling devices attached to them. They are no longer used as an example.
Conventional HVAC compressors are designed to suck liquid and discharge gas in a closed circuit. The unit sucks in compressible gas and discharges compressible gas, which is then used to fill the compressor tank.
Not a meaningless hack, of course, what is the point here, but the question is what has changed, what else needs to be taken into account when assembling, if anything? Just because you’re removing a part doesn’t mean you can’t use it elsewhere or for something else, but at least know that it has the original intent and tries to address those limitations in traditional use cases ( HVAC). Facts here).
This is a very simple traditional HVAC compressor. You basically pull the compressor out and get out of there. The question is not whether they do it. The question is, what exactly does this mean for practical use in this way?
Refrigeration compressors cannot suck in liquid refrigerant. Liquids are incompressible and can quickly damage the compressor. They absorb only steam. These hermetic compressors contain their own oil, just like air compressors, and oil return is very easy. The only issue with the oil is the type used in the factory compressor. Many people use POE oil. These oils absorb water like a sponge, which can cause problems. The new compressor does not contain refrigerant.
At school, we put some POE in a beaker and watched it get cloudy from water vapor in an air-conditioned classroom for a week. We tried vacuuming and heating for a month to remove all the water and bring it back clean before we gave up. I’m really impressed with keeping these things as private as possible. I threw out the oiler after opening, did not install it in the rain, etc.
I suspect there will be problems with this setup, it doesn’t bring these things closer to design pressure.
Well, this shows that you are not an air conditioning service technician. A typical HVAC compressor draws in low pressure, low temperature gas and discharges high pressure, high temperature gas. The condenser then takes the heat and converts it to a high pressure fluid that feeds a thermal expansion valve or piston proportioner into a larger line in the evaporator coil that reduces pressure and temperature to collect heat from the air and then moves it. the compressed gas is returned to the compressor to start the cycle again. If you send liquid back to the compressor, it will overcharge and cause premature failure.
I don’t think you understand what’s going on here after reading your comment. Air conditioning compressors do not suck in liquid and do not release gas. It’s not new and it’s dead. The only unusual part is the parallel execution of so many programs. If you want details, just google DIY silent compressor.
No no no no no no. They honed him in HVAC techniques during their apprenticeship. HVAC compressors are designed to receive and discharge only *vapour* refrigerant. Liquid refrigerant that enters the compressor is called backflow and can damage and then damage the compressor.
You are right, running an HVAC compressor without refrigerant is a bad idea. The refrigerant cools the compressor and supplies oil to it. I can imagine that the HVAC compressors used to compress air shut down quickly when thermally overloaded.
Not properly. HVAC compressors suck in steam and release high pressure hot steam. Liquid refrigerant can and will instantly destroy reciprocating hermetic compressors such as these. HVAC specialists work here.
It leaves a lot of oil, and some refrigeration oils are hygroscopic. However, if you are only compressing air and don’t need (or don’t have) a closed oil return circuit, you can replace it with regular mineral oil. That is why new chlorine-free refrigerants require more special oils.
I have never seen a person so incompetent in information. So many wrong things. From runtime to stress and how things work. I really recommend learning it before typing on the keyboard. If any compressor is rated r410, you will see a maximum pressure of 450 psi and 300s of working pressure all day long. I don’t even have time to consider all the points in your post.
I don’t understand your post at all. Do you just want to rant about amazing knowledge that has absolutely nothing to do with the article itself? This article is about how to misuse them, so this is a hack of the HaD article.
I don’t think anyone is underestimating usage other than “intended”. Seems more about possible differences or potential issues that could cause? There’s a reason you don’t fly on a plane with auto parts.
Planes need a little more security. Faulty compressors immediately do their job. This is not life-threatening in any way, and would be inappropriate for a ventilator. :-) Too much oil.
You probably won’t fly an aircraft with car parts, but many people will fly experimental aircraft. Chevrolet ls snowmobile engine. If there was a power to weight ratio, almost anyone would try it!
The best way to hide a noisy machine is to dig a shallow trench wide enough to accommodate the equipment, leave room for maintenance and airflow, and then surround it with a double wall of overlapping sandbags about 2 feet above the machine. This sends the sound up.
I think you’re missing the point a bit here – the goal is to provide a quieter compressed air source and yes refrigerator compressors have a very low CFM compared to regular air compressors so there are a lot of parallel blocks – you can see the same approach in commercial/industrial “quiet” units such as Clarke “Shhhh Air” compressors, 3-4 units are mounted on top of a tank where traditionally there is only a large motor and a large compressor.
The overall efficiency will be reduced, and although the operating current should be low, the output at start can be greatly increased if start/stop is not interleaved between units.
If starting/stopping is a problem, you can cycle the compressor on and off. It also changes the airflow in the long run, evenly distributing the running time between the compressors (I dare mention the previous comment on this in a different context: hackaday.com/2022/07/25/a-simple-charging-station). -for twelve power banks/#comment-6497242)
These plastic lines are typically rated over 10 bar (~145 psi) and are used in many industrial applications. They are cheap, simple, and malleable (do not harden or break when bent). If the tank is a cargo tank with a 7 gallon port, it is rated at 160 psi. This is a very interesting idea and seems pretty safe to me, especially considering that each compressor is isolated by solenoid valves.
Depending on the line in question, I have used plastic lines in paintball guns to supply unregulated CO2, i.e. up to 1200 psi in the summer.
I’m interested in very good reliability. Everyone I know seems to have at least one that works, but I only know 2 that actually work. The fact that this goes on and on makes me think of them as desktop inkjet printers in the garage (the least reliable piece of equipment in every home). How many times have you had to turn off the refrigerator compressor?
you get what you pay for. Being able to buy a 120 psi compressor for $200 and run it for five years without maintenance is a miracle in itself. There’s a reason why an inexpensive commercial compressor from Ingersoll or any other well-known brand costs $2,000 and requires a six-month maintenance schedule.

I don’t know why you are talking about refrigerants when you compress air? These compressors are partially submerged in oil, so if we don’t want oil to get into the air supply, that’s a bad start. Multiple compressors installed this way can cause starting problems, they draw a lot of current at startup so multiple compressors will exacerbate the problem unless some really fancy staging system is devised. New compressors are not cheap, so installing multiple compressors means more system assembly costs. Other than noise, there is no reason to waste time, effort and money on such a system. When it comes to handling refrigerants, you should not only be trained and qualified to handle them, but also collect them safely for disposal.
R290 and R600(a) are regular propane and butane. Yes, it’s highly flammable, but it’s not actually toxic. R32 is another matter, it is fluorinated and combustible, so a very poor combination of properties, the “worst of the two”, and when burned, it produces very unpleasant toxic products.
I did similar with an old R12 freezer compressor >30 years ago. I did similar with an old R12 freezer compressor >30 years ago. Я сделал то же самое со старым компрессором морозильной камеры R12> 30 лет назад. I did the same with an old R12 freezer compressor 30 years ago. I made something similar to an old R12 refrigeration compressor over 30 years ago. 3 2-liter PET bottles from coke are connected to the tank. These compressors typically range from 60 to 150 watts. Fairly low flow rate, but can handle moderate pressure. So it makes sense a lot of parallelism.
This is usually done by refrigeration. No matter how you compress oxygen at room temperature, it does not become a liquid: its critical point is about -110 degrees Celsius, above which there is no longer a phase boundary between gas and liquid.
Not without compression, and a lot. Also, you may not be able to achieve the pressure required for the task with what is readily available. For example, the high pressure of the Linde process is about 75 bar – https://en.wikipedia.org/wiki/Hampson%E2%80%93Linde_cycle.
My (almost silent) Bambi is basically a refrigerator compressor. https://www.coleparmer.co.uk/i/jun-air-jun-air-oil-lubricated-piston-air-compressor-2-12-cfm-120-psi-4-l-tank-120v/ 1620203 I paid the same price for it and I don’t know why it costs 10 times the price of a similar Bambi. Speaking of Bambi, they have multiple units in the same tank, but not up to the level stated in the cited article. Looks like there could be up to three: https://bambi-air.co.uk/products/md-range-silent-air-compressors/
They write at a high level; air receivers are internally powder coated to prevent corrosion, internal valves are stainless steel and each model is equipped with a 10 micron air filter & outlet pressure regulator as standard. air receivers are internally powder coated to prevent corrosion, internal valves are stainless steel and each model is equipped with a 10 micron air filter & outlet pressure regulator as standard. the air receivers are internally powder coated to prevent corrosion, the internal valves are stainless steel, and each model comes standard with a 10 micron air filter and outlet pressure regulator. The inside of the tank is powder coated to prevent corrosion, the internal valves are stainless steel and each model comes standard with a 10 micron air filter and outlet pressure regulator.
Maybe because they expected that air with water inside (humidity) would corrode steel under pressure and heat? Can they also use a compressor designed or built specifically for this application?
The only silent compressor equipped with piston rings eliminates oil residue in the air supply section, which is also interesting.
Not sure if the piston ring part made sense in the first place. Is it a scroll compressor? He hesitates. So why add piston rings?
A niche product is fine, but it’s still neat because it’s a commercial product and they’re interested in what they think needs to be decided at the design stage.
What a deal! British production will definitely return. Soon we’ll break down on the side of the road.


time: Nov-17-2022