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[Special Topics] Maglev Refrigeration Compressor: Let Central Air Conditioning Enter the Era of High Energy Efficiency and Low Operation

2019-09-21 09:10

With the development of electronic technology, control engineering, signal processing components, electromagnetic theory and new electromagnetic materials and rotor dynamics, magnetic levitation technology has been greatly developed in recent years. Magnetic levitation uses the principle of magnetic "same-sex repulsion, opposite-sex attraction" to add a corresponding electromagnetic field between the rotor and stator of the bearing, and control the electromagnetic field to make it in a relatively "suspended" state. Magnetic levitation system, which is composed of rotor, sensor, controller and actuator 4The actuator includes two parts: electromagnet and power amplifier. Magnetic bearing is a kind of magnetic field to suspend the rotor, so that it will not produce mechanical contact and mechanical friction when rotating, and no longer need mechanical bearings and lubrication systems necessary for mechanical bearings. Using magnetic bearings in refrigeration compressors, all the troubles caused by lubricating oil no longer exist. Maglev refrigeration compressor is the application of magnetic bearing technology.

in 2015The two sessions of the year"Increase energy conservation and emission reduction efforts"Under the call of the maglevRefrigerationThe significance of technology for building a conservation-oriented society is obvious. Magnetic levitation technology has broken the long-standing foreign brandCentral air conditioningChillerThe monopoly of high-efficiency energy-saving technology has enabled my country to make a revolutionary breakthrough in the field of energy-saving chillers, marking that my country's central air-conditioning is about to establish a milestone from China's manufacturing to China's intelligent manufacturing. The next 10The central air-conditioning industry will also belong to the maglev era.

1. magnetic suspension refrigerationCompressorPrinciple:
 

With the development of electronic technology, control engineering, signal processing components, electromagnetic theory and new electromagnetic materials and rotor dynamics, magnetic levitation technology has been greatly developed in recent years. Magnetic levitation is the use of magnetic"Same sex repel each other, opposite sex attract each other"The principle of, in the bearing rotor and stator between the corresponding electromagnetic field, by controlling the electromagnetic field, so that it is in a relatively"Suspended "state.

Magnetic levitation system, which is composed of rotor, sensor, controller and actuator 4The actuator includes two parts: electromagnet and power amplifier. Magnetic bearing is a kind of magnetic field to suspend the rotor, so that it will not produce mechanical contact and mechanical friction when rotating, and no longer need mechanical bearings and lubrication systems necessary for mechanical bearings. InRefrigeration compressorWith the use of magnetic bearings, all the troubles caused by lubricating oil no longer exist. Maglev refrigeration compressor is the application of magnetic bearing technology.

Main components of 2. magnetic suspension compressor

The main components of the magnetic levitation compressor are aluminum alloy precision casting compressor body, two-stage compression centrifugal impeller, integrated motor rotor and drive shaft made of permanent magnet material, permanent magnet synchronous motor, electromagnetic bearing, adjustable inlet guide Vane, AC/DCPower conversion system, electromagnetic bearing control system and soft start control system.

The magnetic levitation frequency conversion centrifuge is discharged from the air conditioner compressor through high temperature and high pressure freon, enters the condenser, releases heat to the copper tube cooling water, condenses into medium temperature and high pressure freon liquid, and then depressurizes into low temperature and low pressure liquid through a throttle valve to enter the evaporator, absorbs heat from the chilled water flowing through the copper tube in the evaporator shell, gasifies into low temperature and low pressure gas, and sucks into the compressor, and discharges into the compressor after secondary compression in the compressor, z *Finally achieve the purpose of cooling.



Characteristics of 3. magnetic suspension refrigeration compressor

 

  1High operating efficiency: especially in partial load conditions than other brands of the same type of compressor energy saving 48%. This special performance can be monitored on site or remotely through a network-based monitoring and diagnostic system.

  2No need of lubricating oil,Maintenance costs are 50% lower than oil-containing compressors: oil-free is achieved after decades of struggle in industry. The oil-free design not only eliminates the possibility of reducing efficiency due to oil contamination, but also eliminates oil management accessories: oil heaters, oil pumps, oil separators, oil filters, etc.

  3Ultra-light body design: a 120The cold-ton compressor weighs only 295 pounds, which is 1/5 the weight of some traditional machines.

  4Ultra-quiet operation process: the sound during operation is less than 70Decibels, the compressor is so quiet that if you are in the background of typical equipment, you can't hear it running at all.

5Redefined soft start: The compressor redefines the soft start, only 2Amperes of starting current, while the traditional compressor needs 500~600Ann.

 

Comparison of 4. Traditional Refrigeration Compressor and Magnetic Suspension Refrigeration Compressor


  1Principle aspect
In traditional refrigeration compressors, mechanical bearings are necessary components, and there must be a lubricating oil circulation system to ensure that the mechanical bearings work.
The magnetic suspension refrigeration compressor uses a magnetic field to suspend the rotor in the air without mechanical contact and mechanical friction during rotation. Therefore, the magnetic suspension bearing no longer needs mechanical bearings and the lubrication system necessary for mechanical bearings.


  21. Redundancy function of cooling system;

The redundancy function of the cooling system is very important, but often due to the limitation of space scope and cost, the traditional refrigeration compressor cannot install multiple compressors in one machine to realize the redundancy function of the cooling system.
The magnetic levitation refrigeration compressor product enables multiple magnetic levitation compressors to be installed in a common unit to achieve redundant functions. If a single compressor fails, other compressors can still operate normally.

3Operational efficiency:
The cooling capacity of traditional refrigeration compressor needs at least 500-600
A starting current.
Maglev refrigeration compressor than the traditional compressor operating efficiency 30
%. The adaptive control logic in the automatic control system allows a 450-ton chiller to provide cooling capacity z * as low as 0.33 kW/ton and cooling time as long as 40-50h. This super adaptive control logic can meet the cooling needs of the whole day, no special settings are required.

 

Development History of 5. Maglev Central Air Conditioning

Maglev Centrifugal Refrigeration Compressors from z *Up to now, there have been 18The time of the year. At present, the magnetic suspension refrigeration compressor has begun to be put into practical application in large quantities.
Magnetic Levitation Refrigeration Compressor z *Early in the 1993RON CONRY, who invented the M-ULTISTACK modular chiller, led the research in Melbourne, Australia.Mr.
from 1993With the progress of research, the technology of maglev compressor has evolved and developed, and the project itself has undergone many changes, z *As early as Melbourne, Australia as a part of the MULTISTACK, and later received funding from the Government of Quebec, Canada, the entire project was relocated to Montreal, Canada to continue;
And then later, magnetic levitation compressor technology has been basically mature, DANFOSSjoined in the form of a joint venture and z *Eventually evolved into DANFOSS.TURBOCORCompany, began the large-scale production and manufacture of magnetic levitation compressors.
  DANFOSSThe joint venture, in turn, has contributed to the further upgrading of maglev compressor technology and product variety, from z *At the beginning of a single specification of the compressor, has been developed to be used in water-cooled chillers and air-cooled chillers, respectively, a variety of specifications of the compressor series.

  Development of Maglev Central Air Conditioning in China

In the field of domestic central air conditioning, Haier z *Early development of magnetic levitation central air conditioning enterprises. At present, Haier has successfully realized the product serialization of magnetic levitation central air conditioning, and has become the leader of magnetic levitation central air conditioning in China and the world.
  2003Year: q * s *The birth of magnetic levitation compressor
  2006Year: China's first magnetic levitation central air conditioner was born in Haier
In fact, domestic and foreign manufacturers have gradually matured their research on the technology related to maglev units, such as foreign-funded enterprises McVille, Danfoss, etc., and domestic enterprises Haier, Midea, Gree, etc. have also made continuous efforts in this field and made breakthroughs in technology. Promoted the technological upgrading of the entire industry.












 

Future Development Space of 6. Maglev Central Air Conditioning

Magnetic levitation refrigeration compressor turned out, not only for q *The HVAC industry provides a new way of applying technology, as well as a central air conditioning technology z *Cutting-edge, energy-efficient z * high product applications, which subvert the U.S. 4The monopoly of big brands in the domestic market and technology makes the national enterprises represented by Haier stand out in the irreversible tide of "intelligent manufacturing in China" and become the leader of magnetic levitation central air conditioning technology. Under the active promotion of Haier, the industrial pattern and market pattern of domestic central air conditioning have undergone a great change.
With Haier magnetic levitation central air conditioning as s *The steady rise of domestic brands, China's American Department 4The market monopoly pattern of big brands has been broken, and the technical threshold for industry entry has been further improved. The overall share of European and American brands has shown a slight downward trend, but the pattern of confrontation will not change in the short term.
At the same time, the industrial structure of central air-conditioning has also been further adjusted, China's central air-conditioning enterprises are currently inMulti-OnlineModule machines, screw machines, centrifuges have made rapid breakthroughs, the overall industry technical threshold to improve, a considerable number of enterprises will be eliminated, brand concentration will be further improved.
At present, energy conservation and environmental protection have become an irreversible development trend in the air-conditioning industry. It is understood that Haier magnetic levitation central air-conditioning has created 26The industry z *High energy efficiency ratio, and in terms of energy saving, according to monitoring, compared to traditional products Haier maglev central air conditioning energy saving coefficient of up to 50%. A data shows that at present, the area of office buildings and commercial real estate in China is about 12According to this calculation, if all magnetic levitation air conditioners are used, 32.2 billion kwh of electricity consumption for cooling can be saved in a year, which is equivalent to the annual power generation of 1/3 Three Gorges power stations and the consumption of 13 million tons of standard coal per year.
Some people think that maglev is a machine that will change the world, but experts say it is more like a machine that will change Haier. It enables Haier and other domestic central air-conditioning brands to compete with foreign brands in the high-end technology field of the industry by virtue of technological innovation advantages, which also fundamentally changes the traditional pattern of China's central air-conditioning industry with backward technology and foreign brands as the mainstay. Drive China's central air-conditioning industry to get rid of the traditional competition model, create a market core competitiveness centered on technological innovation, and seize the valuable market in the field of refrigeration and air-conditioning.





 

 

 

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