The energy-saving and environmental protection air-conditioning industry has high demand for NdFeB
Pubdate: 2019-12-31 08:38 pageviews:
① Technology status of air conditioning industry Air conditioners are divided into fixed frequency air conditioners and variable frequency air conditioners. The working and technical principles of fixed-frequency and variable-frequency air conditioners are quite different. Fixed-frequency air-conditioning refers to that the air-conditioning compressor rotates at a fixed frequency (generally 50 valences) during work. Generally, there is only “on and off,” regulation mode, compressor output power Immutable, temperature adjustment can only rely on the compressor's repeated start and stop, not only the noise and temperature fluctuations are large, and frequent switching on the air conditioning compressor is very damaging. Variable frequency air conditioning refers to the use of a microcontroller to make the compressor operating frequency can Change within a certain range (such as 20Hz ~ 100MHz). The principle of frequency conversion technology is to control the speed of the motor by changing the frequency of the input voltage, and the change of the speed of the motor will cause the change of the compressor's air delivery volume and the circulating flow of the refrigerant. It also changes accordingly, so that the cooling capacity or heat supply of the air conditioner changes to reach the mouth that regulates the ambient temperature. Compared with the fixed frequency air conditioner, the inverter air conditioner has the following advantages:
| Characteristic | Comparison between inverter air conditioner and fixed frequency air conditioner |
| Temperature control | Compared with the fixed temperature air conditioner's 2 ℃ temperature control range, the variable frequency air conditioner operates at high frequency when it is turned on, and then switches to low frequency operation after reaching the set temperature within a few minutes. The temperature control range is 0.5 ℃ and the temperature control is accurate. |
| Cooling and heating speed | Because the inverter air conditioner operates at high frequency when it is turned on, it can reach the set temperature in a short time, which is generally only the normal time of the fixed frequency air conditioner. |
| Energy saving | Inverter air conditioners do not need to be turned on and off frequently, and they operate at low frequencies most of the time, which can save more than 30% of energy compared with fixed frequency air conditioners. |
| Noise | The whole machine noise is about 2 ~ 3 decibels lower than the fixed-frequency air conditioner of the same power. |
| Operating life | Frequent start and stop of fixed-frequency air conditioners cause great damage to the compressor. The life of the compressor is 8-12 years, while the inverter air conditioner usually operates at low frequency, and the compressor and air-conditioning system operate stably, and the life span generally reaches 12-15 years. |
| Low voltage start | When the inverter air conditioner starts, the voltage is small, and it can be started under low voltage and low temperature conditions.It realizes stepless speed change of the compressor, and it can adapt to large area heating requirements. |
| Starting current | When the fixed-frequency air conditioner is turned on, the starting current assembly will cause an impact on the power grid, and it will also have an impact on household appliances. Impact and impact on the normal operation of household appliances. |
Inverter air conditioners are energy-saving and environmentally-friendly air conditioners in front-of-mouth air-conditioning industry. They have rapidly developed into the upper class of the world's air-conditioning industry with the characteristics of energy saving, high efficiency and environmental protection. Japan introduced the world's first inverter air conditioner in 1983, and by 2007 it had accounted for more than 99% of the Japanese market.
② Energy-saving and environmental-friendly air-conditioning industry policies
③ Demand for high-performance neodymium-iron-boron permanent magnet materials in the energy-saving and environmental-protection air-conditioning industry. The magnets used in compressors for inverter air conditioners are divided into two types: ferromagnetic permanent magnets and high-performance neodymium-iron-boron permanent magnets. Ferrite permanent magnetic materials have low magnetic properties and are relatively cheap. They are mostly used in the production of low-end inverter air conditioners. High-performance Qin Fe-B permanent magnet materials are the permanent magnet materials with the highest magnetic properties. They are mainly used to produce high-end inverter air conditioners. .
Ferrite permanent magnets take up a lot of space in the compressor due to their low magnetic properties and large usage. With the improvement of the performance of inverter air conditioner compressors, the requirements for the magnetic properties of its magnets are becoming higher and higher. If ferrite materials are used, the amount will be doubled, and the consumption of other materials such as copper in the motor will also be required. The corresponding increase will not only occupy the space of the compressor, but its low-cost advantage will gradually weaken. Therefore, in the future trend of miniaturization of air conditioners, the application of ferrite permanent magnet materials in inverter air conditioners will gradually be replaced by high-performance neodymium iron boron permanent magnet materials. According to the China Magnetic Materials and Device Industry Association, in the next few years, the proportion of inverter air conditioners using high-performance neodymium-iron-boron permanent magnet materials will rise rapidly from 2008 to 2014 and will reach 20%, 30%, and 40%, respectively. , 50%, 60%, 70%, 80%, according to the air-conditioning industry manufacturers' experience, each inverter air conditioner requires an average of about 0.25 kg of high-performance neodymium-iron-boron permanent magnet materials. Based on this proportion, it is estimated that energy conservation and environmental protection in 2006 ~ 2014 The air-conditioning industry has a huge demand for high-performance hinged boron permanent magnet materials.
