If you wish to find a quality vacuum pump, you should consider a few factors beforehand. The first step you should take is to determine what you wish to use it and technology, chemical resistance, lubrication, flow rate, and vacuum levels, among other things.
Of course, the primary concern should be the desired vacuum level and quality of what you wish to achieve. We can differentiate various types of vacuum, including an ultrahigh, high, and low vacuum.
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The difference lies in the number of obtained molecules, which is something that we measure by using the pressure of residual gases. Therefore, the weaker pressure you get, the fewer molecules you can pump and vice versa.
Features To Consider When Choosing a Vacuum Pump
We decided to present you features and characteristics you should consider before finding the best pump for your particular requirements.
- Flow Rate – The flow rate depends on the draining time of the machine. Therefore, you should determine the capacity of the pump to create a volume flow rate or pumping speed, as well as the mass flow rate based on the requirements you wish to handle. In most situations, the higher the flow rate you get, the draining time will be shorter.
- Chemical Compatibility – You should also consider the compatibility of the gases that you wish to use for the application. Therefore, you should analyze all potential issues that may happen along the way.
- Lubrication – You need to ask yourself whether you should lubricate the pump or not. However, if you wish to maintain overall resistance and efficiency, you need to do it frequently. Of course, it requires regular maintenance, while you should use a dry pump within the lab environment.
- Expenses and Maintenance – Similarly, as we have mentioned above, you should analyze the maintenance cycles and their frequency. That way, you will be able to determine overall expenses that come with the installation and maintenance costs and initial investment you need to make.
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Different Types of Vacuum Pump
1. Rotary Vane Vacuum Pump
The best solution for high-performance tasks and assignments for affordable price tag are rotary vane vacuum pumps. You can rest assured because they are both compact and small, which means that they can reach the narrow areas with ease.
It can easily capture vapors before they reach into contact with the surroundings, which is an important consideration you should remember.
Of course, they operate on oil, which will provide you the exceptional airtightness, efficient and constant lubrication of moving parts, and cooling and heat dissipation during the operation.
Of course, you need to maintain it regularly, especially if you wish to use it for years after purchase. One of the most significant downsides of this particular type of vacuum pump is the need to change oil frequently so that you can reduce the chances of tear and wear.
You should change the oil after three thousand hours of usage.
2. Diaphragm Vacuum Pump
The best solution on the market that will provide you resistance to chemicals and corrosion is diaphragm vacuum pumps. That is the main reason why you can use them for corrosive, acidic, and viscous products.
This particular characteristic means that you will be able to use it in fields, including the food industry for pumping syrups, chocolate, and water, for instance. However, it is also a common choice in chemical and cosmetics industries, among others.
They are perfect for handling volatile compounds and rotary evaporation, which is an important consideration you should remember. You can use them continuously, which is not something that you can do with other types that you can find on the market.
Another important consideration is that they are dry, which means that you do not have to lubricate them similarly as the ones that operate on oil. As a result, you can rest assured because you will spend less money on maintenance; however, they are expensive to purchase.
3. Liquid Ring Vacuum Pump
Similarly, as the name suggests, liquid ring vacuum pumps use a centrifuged liquid within the pump walls, and as a result, the ring will maintain the airtightness of the process.
Remember that these pumps come with numerous advantages, and they are highly useful in petroleum refineries, distilleries, mines, power plants, sugar factories, and many more.
They are great because you will not get a device sensitive to vapors, solids, and liquids. Besides, they come with isothermal compression, which is perfect for heat-sensitive and explosive products.
You can also use this particular type of vacuum pump for moisture extraction, vacuum filtration, mineral recovery, ash handling, and removal of water during the paper processing.
They can reach the maximum flow rate of 30 thousand m³/h, which means that you will increase and decrease pressure depending on your needs and requirements. Of course, you need to pay attention to saturated vapor pressure within the liquid ring
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In theory, the minimum pressure of the pump should not be lower than the saturation pressure of the ring because that may lead to ring vaporization, which is not something you should allow to happen.
4. Scroll Vacuum Pump
Scroll pumps are perfect for dry and clean vacuum pumping, which means they are common choices in laboratories and research fields. They come with two spiral-shaped scrolls that can compress and pump gaseous and liquid materials.
The first spiral can orbit around it, while the second one is fixed, which means that you will achieve the movement that will compress the gas while pumping. They are compact, noiseless, and you do not have to use oil for lubrication purposes.
The joint spiral is responsible for the overall airtightness. However, you need to conduct regular maintenance by replacing a seal frequently to ensure the airtightness.
Besides, they are vulnerable to particles that can erode the spiral seal and debris, which is something you should remember.