There are many types of dry pumps. Let's discuss a few of the top ones.
Diaphragm Pumps
Diaphragm pumps have many benefits, such as having a long lifespan and not needing oil to ...
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Dry Pumps
There are many types of dry pumps. Let's discuss a few of the top ones.
Diaphragm Pumps
Diaphragm pumps have many benefits, such as having a long lifespan and not needing oil to run. They are perfect for jobs that require a clean and dry rough vacuum. Diaphragm pumps are a popular choice in chemical and laboratory industries, as the pumps allow gases to be pumped without contamination from pump oils or fluids.
Another good thing about the pump is it can be used for research/development, as well as for leak detection. The diaphragm pump is reliable and it doesn't produce much noise or vibration. If someone owns a turbo drag-pump, the diaphragm pump can be used as a backing pump.
Scroll Pumps
The scroll pump contains spiral-shaped scrolls that are found in the vacuum housing. At the center of the scroll is an exit valve. One spiral moves without rotating, while another spiral is fixed. At the end of the spirals is where gas enters, and the gas gets trapped before entering the center.
The gas eventually becomes compressed before it exits via the non-return valve. None of the moving parts in the chamber needs to be lubricated, but there are PTFE tip seals. These seals will need to be changed over a period of time because they are prone to wear and tear.
Multi-Stage Roots Pumps
These types of pumps are capable of operating at high speeds and they are known for their low pressure. Multistage roots pumps operate with two counter-rotating rotaries operating without contact within a housing. Gas is compressed from the inlet and moved to the exhaust.
These pumps don't require lubrication to create vacuum (there is lubrication for the bearings). This means that certain things can be avoided, such as hydrocarbon vapor backstreaming. Multistage roots are popular in many applications due to their relatively low cost to buy and maintain, compact size, and versatility for many applications.
Screw Pumps
These pumps consist of two screw rotors, which traps the medium that will be pumped between the screw chambers and the cylinder. After it does this, the medium heads to the gas discharge. Screw pumps are designed in a way that produces low energy, especially when compared to traditional screw designs. Not only that, but the heat load of the gas is lowered.
Cooling water or indirect methods of cooling are not required for these pumps, and this is thanks to the high-performance method used for cooling. In turn, cold spots are eliminated. The design is advanced, which also allows for high capabilities in regards to hydrogen pumping. Furthermore, air-cooled heat exchangers are used to aid the pump.
Hook & Claw Pumps
These types of pumps contain rotors that are claw-shaped, and they turn in opposite directions of each other. The rotors are shaped in a way that allows the air or gas to be compressed before it's discharged. Not only that, but the rotors don't touch each other, nor do they touch the cylinder.
There are tight clearances between the rotors, which is why the pump is capable of performing at high speeds. Furthermore, claw pumps contain a motor that is flange-mounted. One of the best things about claw vacuum pumps is that they come in various sizes, which makes it easy to find one suitable for specific projects.
Also, some of these pumps are made in a specific way. This includes applications such as gas tightness, dust protection, and high steam contents. There's also ones designed to increase oxygen content.
Vane Pumps
These types of pumps are equipped with rotary vane technology. The graphite vanes self-lubricate, so it's not necessary to use operating fluid. Compression naturally occurs due to the dry process.
Dry vane pumps work with a similar principle to an oil-sealed vane pump, but without the sealing liquid. Heat is removed via a cooling fan. In turn, heat from the pump and the motor will be removed.