Inverter Air Compressor Saves Electricity Over Industrial Frequency Explained
2022-06-18
An article completely solves the problem of selecting the industrial frequency/true inverter/pseudo inverter/permanent magnet inverter/bipolar compression and other models of air compressors
For people who want to buy a screw air compressor, the process of purchase is mostly like this: first, search for suppliers on the Internet, select a few, and then start to call and ask one by one. What kinds of screw compressors are there, how much each one costs, etc.? Received a variety of responses, some say you want ordinary or inverter, you want industrial frequency? I have a permanent magnet inverter ...... I have an inverter here that is slightly more expensive than commercial frequency but saves power, I have a bipolar compressor that is more energy efficient ...... Also, you don't have a situation where you need it inverter or IF both ...... I think any buyer would not know who to trust. If you want to solve this problem, you need to identify them one by one.
If you assume that I am a buyer, my boss gives me a purchase condition: air compressor with 20 cubic meters and 8 kilograms of displacement. If you ask the manufacturer's model, even if each manufacturer's model is different, they will tell you that your industrial frequency and inverter are both machines, and here is the default common model, this default value is still set to single-stage compression. The reason is simple. In the current screw air compressor market, single-stage compression is still the mainstream, because the technology is mature and cheap. So at this time you should know. The ordinary machine that everyone is talking about is the industrial frequency machine and the single-stage compressor. These names are linked together, and a common screw air compressor is an IF single-stage compression air compressor.
Let me explain why. For the use of air compressors, the parameters given to me by my boss are usually scaled up, which means that in reality the air consumption of the equipment is usually lower than that. That is, the actual air consumption of the equipment is 17 cubic meters, not 20 cubic meters. When purchasing an air compressor, you need to "scale up" this airflow value to ensure that you are purchasing an air compressor safely. Some companies will consider adding equipment in the future and inflate this value. This results in the air compressor producing more air than the actual unit consumes once it is in use. Screw air compressors have a hibernation feature. If the front-end equipment consumes a small amount of air, the air compressor is about to go into hibernation when it is idle and the motor stops turning. This is done to save power. The design of this type of industrial frequency machine also has a lot of energy-saving consciousness. Many manufacturers have set the "idle rate" to measure the proportion of idle start time, that is, the longer the machine is dormant, the greater the "idle rate".
At this point, the question arises. Although industrial frequency machines use hibernation to solve part of the power consumption problem, but the machine is always frequent shutdown and startup, will also cause a lot of power waste. For air compressors Electrical components also have this situation is also a test. It is generally believed that the ordinary delta start and direct start frequency conversion air compressor than industrial frequency power saving, instantaneous starting current can reach more than 7 times the rated current, such a large impact, the components will be used for a long time in advance of the end of life, the power is equal to the product of current and voltage. It can be seen that frequent start-up is also caused by a large power loss (this issue is even broadcast on CCTV Science Channel, "toilet energy-saving lamps are always on or often on and off") has been aired). So manufacturers have come up with a way, that is, with inverter. So some people are going to say, so build inverters, why do you want to keep industrial inverters? In ** one paragraph, I mentioned the term "no-load ratio". There is an assumption here that the airflow of the compressor is chosen "too large". If you buy an air compressor that does not have enough capacity, then I will tell you that an industrial frequency machine is enough, and it is always in use anyway, so you don't need to sleep. In this case, if you choose an inverter, you will not only not save electricity, but also consume it. What is the principle of electricity usage? I think the simplest reason is that if you add an inverter, not to mention the increase in cost.
Inverter air compressor saves electricity than industrial frequency
Some people see this and ask, so the inverter is suitable for a large no-load rate, why is there a true or false inverter? Well, it involves the cost of the machine. True inverter is inverter motor + host + inverter, false inverter is industrial frequency motor + host + inverter. The difference comes out. The real inverter motor uses a higher priced inverter motor inverter air compressor than industrial frequency power saving interpretation, while the fake inverter motor is an ordinary industrial frequency motor. Of course, the saving point effect also comes out, the real inverter is better than the fake inverter machine.
This concept is clear. Some manufacturers like to innovate and improve. They are still not happy with their current inverters. They felt they didn't go far enough and the power saving effect was still limited. So they invented a new permanent magnet inverter. The meaning of permanent magnet inverter is that the host and the motor use the same shaft body, saving the friction between the front end bearing of the motor and the bearing of the connection, link loss and other energy consumption host end, coupling, transmission gear. Of course, energy is a more energy efficient model. By the way, there are some half ** magnets, that is, the coupling still exists, power saving effect is slightly worse. The emergence of permanent magnet inverters is really a good example of "real" manufacturers who want to make energy-saving products. Later appeared rare earth permanent magnet inverter. The rotor of this model contains only rare earth materials, which is more conducive to energy saving and consumption reduction.
The appearance of permanent magnet motors is a good improvement for energy saving. Now some domestic manufacturers have a better model, which is a bipolar compressor. Simply put, the industrial frequency inverter models we mentioned above are single-stage compression hosts, that is, hosts containing a pair of yin and yang rotors. Its compression efficiency still needs to be improved. If the new quad-rotor host is used, it becomes a two-stage compressor, and the efficiency is of course higher. To quote the example just mentioned, with bipolar compression, a motor is no longer needed. If you switch to 90kw, you can achieve an air output of 20 cubic meters per minute, and you can save on electricity costs in terms of power. Bipolar compression reduces the power of a commonly used single-stage machine by one stage.
The development of energy-saving models is not over yet. **Incoming is a bipolar compression permanent magnet frequency conversion screw air compressor, which should be a very energy-efficient model. Looking forward to more and better screws in the future. The emergence of air compressors air compressor, to the entire machinery manufacturing industry to bring the gospel!