Because the head of the main engine is the core component of the screw air compressor, the quality of the main engine directly determines the quality of the brand products, competitive advantage.So we need to talk about it a little bit more.In the past decade, China has gradually become the global manufacturing center of screw mainframe.Through the following points of detailed analysis of the current small domestic market air compressor host fashion basic situation, so that we have some understanding.
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Basic information of screw compressor hosts on the market at present
The main engine of atlas air compressor is manufactured in wuxi, Ingersoll rand is manufactured in Shanghai, GHH is manufactured in wujiang, suzhou, GD is OEM in China, etc.At present, the real host imported are three or four line brands, such as RC host, EU host, TMC host, aerzen host, yuzhen host and so on.Still have host of a few brands, wait for compaq ai, ailiwei, shouli, import rotor, bearing and shaft seal, other component is processed in home, assemble in home.In today's domestic screw machine market, the basic use of the original imported host is a low-end brand.
The figure below shows the 4th generation high-efficiency screw rotor of hand air compressor:
Basic information of German main engine
German screw host entered China earlier, with higher visibility, its representative is GHH host.Technically, GHH host is very suitable for the climate and geographical environment in Europe. It is an environment with low humidity, small annual temperature difference and low extreme temperature.The production scale of screw machine in Germany is small, so the German main engine is mainly used as the master engine to provide supporting machine for small and medium-sized assembly plants in Western Europe, so the German main engine has a high degree of commercialization.It is characterized by high speed, small volume, light weight and few specifications.Even at 60Hz, gears or belts must be used to cover the whole spectrum by increasin
Basic information of British host
British host entered China late, but the speed of popularization is very fast, its representative is SKK host.Britain is the research center of rotor profile of screw engine.It is also the r&d and manufacturing center of screw sub-processing equipment worldwide.SKK tooth shape is a new generation of rotor tooth shape produced in the context of the world energy crisis, so energy saving is its outstanding characteristics.Clearance is the most important factor affecting the performance and efficiency of screw compressor.SKK tooth using surface to surface seal, in the same gap value, the sealing effect is much greater than the early tooth line seal.The higher the rotor machining accuracy, the smaller the transfer clearance of the host, so SKK profile is based on the grinding profile.After 2000, the main screw pair of processing equipment manufacturers have shifted the focus of research and development to the rotor grinder.Low speed is the only effective means to perfect the compression process.SKK engine design speed is low, providing enough time for heat exchange between oil and gas, make the compression process close to isothermal, reduce the compression work to the theoretical minimum value.
For large screw compressors that must adopt gear change, the British main engine sticks to the speed limit of 2200 RPM, because beyond this speed limit, under the action of centrifugal force, lubricating oil is difficult to adhere to the metal surface, and gear lubrication is affected.Multi-stage compression is not recommended for British main engine under the exhaust pressure of 1.3mpa.Because the screw compressor mainly depends on the injection of oil cooling to improve the compression efficiency.The temperature rise of screw compressor is small, and the temperature is very close to the dew point temperature under the corresponding pressure.If multistage compression is adopted, the result of interstage cooling will inevitably lead to the precipitation of a large amount of water in the interstage, the drainage water and lubricating oil mixed into the next level, will inevitably deteriorate the lubrication of the next level of parts, causing excessive wear.Without interstage cooling, the effect of multistage compression is the same as that of single-stage compression.The publicity of two-stage compression energy saving in universal pressure screw compressor is based on the pseudoscience of commercial hype.Due to a large number of parts and components, the reliability of two-stage compression screw compressor is greatly reduced, and the service life of the machine is significantly shortened.
The LU type screw compressor of guangdong hand air compressor with its advanced X tooth makes the impact, vibration and noise of the machine reduced to the maximum extent, thus effectively extending the life of the moving parts.For example, the noise of 100HP is only 68 db (less than 1 meter), which indicates that the moving parts of the compressor have high machining accuracy, low noise, good material, small impact and vibration, and long service life of the machine, which actually reflects the design and processing level of the machine.Noise is not only an important indicator for the performance of mechanical equipment, but also a necessary indicator for environmental protection.