There are several factors you need to take into consideration when choosing a VP. The main thing to look at is the intended use because the necessary flow rate, vacuum level, chemical resistance, lubrication and technology differ from model to model. This is also great because there are numerous benefits of a vacuum pump system for any industry where it is needed.
You can divide them in many ways but when it comes to quality and vacuum level, they can be rough or low, high and ultrahigh. This is connected with the number of molecules obtained. The quality is better when there is a high number of molecules per cm³. In most cases, you won’t be able to figure this out by looking at some specifications that manufacturer placed in a catalog so it’s better to ask them directly about the product.
Factors to Consider When Choosing a Pump
Flow rate is the first thing most people will mention when talking about specifications and it is linked to the draining time which is essential to evaluate the capacity. You will have a shorter draining time when you have a higher flow rate but it doesn’t always have to be the case. The second factor would be chemical compatibility which is important in order to avoid any issues. You will decide which one to get based on the gases used in your application.
Another factor is the lubrication and you will use it or not which can increase resistance and efficiency but for some industries, you won’t be able to do it. For example, in a laboratory, you will need to use a dry vacuum instead. Cost and maintenance are the last thing to place on the list. This will be determined by the type including rotary vane, diaphragm, liquid ring, scroll and turbo molecular pumps. Click here to read more.
Rotary Vane VP
The most common suggestion for a high-performance VP with a low price would be rotary vane VP. They are mostly rough level but are small and compact. More importantly, they are used for high-boiling solvents and aqueous samples. Before even coming in contact with the pump, vapors can be captured.
One disadvantage they have is that you need to maintain it by using oil because it can’t operate without it. It ensures that all parts are working smoothly and to distribute the heat. How often you change the oil depends on the model and it can be from one day to every 3000 hours of use.
The main feature of this type is that they are extremely resistant to chemicals and corrosion. So, they are great when coming in contact with corrosive, viscous and acidic products. The food industry uses this type the most for pumping fluids like syrups, chocolate, water and similar liquids. It’s also used in the chemical and cosmetic industry for gels and creams.
This means that it is great to work with volatile compounds and continuous operation. It is also a dry pump so there’s less maintenance and the cost will be lower. If you compare it to the rotary type, you will have a lower level model so it’s not proper for freeze-drying.
This type of VP function by providing a liquid that is centrifuged on its walls. This process keeps its airtightness and forms a liquid ring. They have a lot of advantages especially if you are in the industry like sugar factories, mines, power plants, petroleum refineries and distilleries. Another great this is that it isn’t very sensitive to the passage of vapors, small solid particles or fluids.
On the other hand, because of the isothermal compression, it can work with heat-sensitive and explosive products on a high safety level. Some of the uses include removing water from the pump while paper processing, ash handling, mineral recovery, moisture extraction and filtration. Some of them can have a flow rate of up to 30000 m³ per hour. You will need to have a professional operate on them considering the power they can have. One of the most important things is to keep the saturation pressure of the liquid ring higher than the minimum pressure of the VP. Find more information here: http://www.mechanicalengineeringsite.com/liquid-ring-vacuum-pump-working-principle-and-pumping-system/
If you work in a laboratory, you will probably find a scroll vacuum that is used for dry and clean pumping. It’s very helpful in research centers and can be very pricy depending on the manufacturer. It uses two spiral-shaped scrolls to compress and pump gases or fluid where one of them is fixed and the second is orbiting around it.
The gas is compressed by this eccentric movement and they won’t rely on oil. The airtightness that is needed is provided by the joint spiral which makes it compact and quiet. An issue can be that you have to replace the seal to be sure it stays airtight. Another problem is that they are vulnerable to debris that can erode the seal.
Turbo molecular VP
You will need to do deeper research in order to understand the difference in power and ability in some of these products. When it comes to turbo molecular type, the flow rate goes from 50 to 5000 liter per second and works as same as compressors. It uses rotating blades that are powered by an electric motor that pushes the air.
These types of vacuums don’t use oil and are clean pumps. Similar to the scroll model, they are great for laboratory analysis and analytical instrumentation. They are more complex than other kinds which make them more expensive and can require extra maintenance. You will need to have a bigger budget so consider other options with similar capabilities.
Before buying you will need to understand what is the perfect solution for your needs looking at the many types that are available. It’s always beneficial to have a professional to assist you because it is expensive and you don’t want to make a wrong purchase. Manufacturers are constantly working on improving them and it is expected to make a big advancement in the near future.