Rotary Screw Vs Rotary Vane Compressor
Published: 30/05/
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Rotary screw vs rotary vane compressor: choosing the right air compressor
When choosing an air compressor for any application, it&#;s important to understand how it will meet the needs of your business. Two common air compressors you can choose from are rotary screw compressors and rotary vane compressors.
Both air compressors were developed around the same time and they&#;re designed to produce the same end result but they do differ slightly so it&#;s important to be aware of the differences and which is best for your application.
We&#;ll take a look in more detail in this guide.
What is a rotary vane air compressor?
A rotary vane compressor is made up of a rotor inside a cylindrical housing and the rotor has slots for the vanes. As the rotor moves, the vanes are thrown out by centrifugal force until they touch the housing. As the air enters the compressor, it is trapped between the vanes and the volume of trapped air becomes gradually reduced as the rotor turns. This compressed air exits the outlet to power the processes it&#;s required for.
Benefits of a rotary vane air compressor
The key benefits of a rotary vane air compressor include:
What is a rotary screw compressor?
Rotary screw compressors are made up of two helical screws, or rotors. The rotors rotate towards each other in opposite directions and compress the air between them as they turn. The air becomes trapped between the two rotors which reduces the volume of the trapped air and results in compressed air that can be used within a wide range of applications.
If you&#;d like to know more about how a rotary screw air compressor works, please read our guide.
Benefits of a rotary screw air compressor
The benefits of rotary screw air compressors include:
How do rotary screw and rotary vane compressors compare?
There are a few key ways in which these two compressors differ and knowing the differences can help you to choose the right compressor for your application.
Energy efficiency
Energy efficiency is a key factor for many businesses and industrial applications. An inefficient air compressor can affect the bottom line and cause unwanted ongoing maintenance costs.
Rotary Vane air compressors
This type of air compressor has very minimal internal air leakage which makes them more energy efficient than other types of air compressor. Lubrication inside the compressor means the rotor vanes stay in contact with the cylinder surface constantly so the air seal is nearly perfect.
Rotary Screw air compressors
Rotary screw compressors have a &#;blow hole&#; which contributes to internal air leakage and will never be completely eliminated which makes rotary screw air compressors less energy efficient than rotary vane compressors.
To compensate for this leakage, screw compressors run at high speeds. On the other hand, vane compressors operate at low speeds which leads to lower power consumption.
A compressor that operates efficiently has minimal air leakage because losing air during compression means lost energy. If internal leakages are kept to a minimum, the volumetric efficiency of the air compressor is increased which reduces the power required to deliver a unit of compressed air.
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Additional reading:The Complete Guide To High-Pressure Air Compressor ...
Performance
Both rotary vane and rotary screw air compressors are designed to run continuously. This makes them the perfect solution for highly demanding industrial or manufacturing environments that need long term and high volumes of air.
Longevity and maintenance
If a rotary vane air compressor is looked after properly, the operating life can be unlimited. Some air compressors can last for up to 100,000 hours without experiencing any wear. However, it&#;s important to have your compressor regularly serviced to make sure it operates properly throughout its lifetime.
Screw compressors can run for up to 20,000 hours but will need roller bearings to be replaced after this time to continue operating at full capacity.
The compressor you choose will depend on the needs of your business and the maintenance you can provide on a regular basis to keep the compressor running as well as you need it to.
Whilst rotary screw air compressors may not operate as long as rotary vane compressors, they offer better energy saving qualities. Rotary screw compressors produce less heat than other compressors which helps to reduce the costs of maintenance and provides optimum performance throughout the lifetime of the compressor.
If you&#;d like more information on how a rotary screw air compressor could benefit your application, please contact our expert team.
You may also be interested in some of our other blogs:
Advantages and Disadvantages of Sliding Vane Compressor
1. What is sliding vane compressor?
Sliding vane compressor belongs to a kind of rotary compressor, its axial slide does radial sliding in the rotor (cylindrical cylinder eccentric), the air intercepted between the slides is compressed and discharged. Rotary compressor has two cases: one is the slide installed in the slot on the cylinder, because the slide does not rotate with the rotor to do rotary motion, called the fixed slide (vane) compressor, that is, the rolling piston compressor ; the other is the slide is installed in the groove of the rotor, with the rotor to do rotary motion, called rotary sliding vane compressor, abbreviated as sliding vane, or rotary lobe, rmpotary vane coressor.
2. How does a sliding vane compressor work?
What is the Working principle of this compressor? Sliding vane compressors are mainly composed of three parts: the body (i.e., cylinder), rotor, and sliding vane. The outer surface of the rotor and the inner surface of the cylinder are circular, and the rotor is mounted eccentrically in the cylinder so that the two are tangent, forming a crescent-shaped space between the inner wall of the cylinder and the outer surface of the rotor. The rotor has a few sliding slots, each slot is equipped with a free sliding slider, rotor rotation, the slider by the centrifugal force from the groove thrown out, the end of which is tightly attached to the inner surface of the cylinder, the crescent-shaped space is divided into several fan-shaped chambers, which called the base element. With the continuous rotation of the rotor, the volume of the base element changes cyclically from small to large.
3. What are the advantages of sliding vane compressor?
&#; Simple structure, few parts, easy to realize processing and assembly, convenient maintenance.
&#; Smooth running, low noise, low vibration, small start-up impact.
&#; Compact structure, small volume, light weight, easy to install in narrow space.
&#; Large gas delivery, even flow, small pulsation, no need to install large gas tank.
4. What are the disadvantages of sliding vane compressor?
&#; The mechanical friction between the slide and the rotor and cylinder is more serious, and the wear and energy loss are larger.
&#; Lower service life and efficiency due to greater wear.
5. Application and development trend of sliding vane compressors
The sliding vane compressor is mainly used as an air compressor, with a discharge capacity of 0.3 to 40m3/min, and a low market share. According to different lubrication methods, they can be divided into three categories: drip oil, oil injection and oil-free. Sliding vane compressors are widely used in various compressed air units, small refrigeration and air conditioning units and automobile air conditioning systems. In the chemical industry and food industry, oil-free machines can be used to transport or pressurize various gases, but also as an air source for solid particulate material transport. Sliding vane machines can also be used as vacuum pumps.
Rotary lobe compressor is a modified structure of the sliding vane compressor, because of its starting performance is better, the torque change of compression process is not big, at present is mainly used for mini cars and some smaller displacement tool car air conditioning system. High-speed power characteristics of the sliding vane compressor is the main direction of technical research.
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