Comparison of Advantages and Disadvantages of Mechanical Management Development of Single Screw Air Compressor and Twin Screw Air Compressor Yan Fengwei (Zhaoyuan City Lushan Gold Mining Engineering Co., Ltd., Shandong Zhaoyuan 265400) Screw air compressor is widely used in mines, but According to the mine operating environment, some parts of the air compressor will be lost. The article takes the development history of screw air compressor as the research background. After comparing the structure and performance of single screw air compressor and twin screw air compressor, it shows the superiority of screw air compressor. This can solve some confusions and problems when some customers choose and use the screw air compressor.
Air compressor; single and double screw; advantages and disadvantages; maintenance and repair 1 single, twin screw air compressor introduction screw air compressor is very simple in structure, operability is relatively strong, reliable performance, it is due to screw air compressor Some of the advantages made it attract the attention of the industry after its birth. With the continuous development of technology, the share of screw air compressors in many western countries such as the United States, Japan and Europe is almost 100%. The technical parameters of screw air compressors are: the flow rate is between l~60M3/min, and the pressure is 0.7/0.8mpa. After statistics, 99% of the users chose screw air compressors.
1.1 Twin-screw air compressors Twin-screw air compressors are widely used in the mining, metallurgy, construction and refrigeration industries. Their wide capacity and operating range have replaced other types of air compressor operations. According to detailed data, in the domestic sales use, the twin-screw air compressor is 80% higher than the volumetric air compressor, and half of all the volumetric compressors that have been put into use. The machine is a twin screw air compressor.
1.2 Single-screw air compressor If the single-screw air compressor is constructed by a single screw, the industrial technical equipment originating in the middle of the 20th century is composed of three rotating shafts, including A screw rotor, two planetary gears perpendicular to the screw rotor. It is also a kind of screw air compressor, its performance is almost the same as that of twin-screw air compressor, most of Yan Fengwei (1971-), male, Shandong Zhaoyuan, undergraduate, intermediate mechanical engineer, research direction: mine Machinery, now working for Zhaoyuan City Lushan Gold Mining Engineering Co., Ltd.
The refrigeration industry is happy to accept this single screw air compressor operation.
2 Comparison of single and twin screw air compressors 2.1 Working principle 2.1.1 Single screw air compressor The single screw rotor is coordinated with the two planetary gears of the vertical distribution, which are formed by the screw groove and the inner wall of the machine. The closed mode allows the gas to produce the desired pressure value in this elementary volume. The advantages are low-cost manufacturing cost, simple machine structure, ideal balance of force, and no gap in volume. However, since the main body of the single-screw air compressor is small in size and the area occupied by the auxiliary machine is too large, the indium is formed into a whole machine. 2.1.2 twin-screw air compressor The twin-screw air compressor is an average distributed and intermeshing pair of rotors. The working principle is that the pair of rotors are clockwise and counterclockwise at the start. Rotating in both directions produces the required pressure gas in the counter-rotating meshing rotor. The utility model has the advantages of high mechanical reliability, excellent dynamic balance, wide application range and stable operation process.
2.2 Mechanical Technology 2.2.1 Single Screw Air Compressor During the operation of single screw air compressor, the single screw has contact friction with the planetary gear. Because the material of the planetary gear is made of resin, it will lead to the relationship between the rotor and the planetary gear. Loss, the resin powder consumed will fall into the oil, which will cause high temperatures to stop the machine, which is often said to be short-lived, large internal leakage, and reduced exhaust. In order to improve the specifications of this type of machine, the development goal is to start from the two aspects of large capacity and small capacity, but the machining accuracy of the meshing part of the single screw air compressor has very high standards, so I want to The development of the specifications for the capacity-polarization of the varieties has been technically limited.
2.2.2 Twin-screw air compressor The twin-screw air compressor is technically engaged by the male and female rotors. After starting, the two rotors are separated by oil film and do not directly rotate. Therefore, the mechanical friction of the machine is relatively small, and the loss of components is also reduced. The displacement does not change according to the time.
2.3 Core motor 2.3.1 Single-screw air-shrinking machine The core main motor of this specification is a common type of motor. The bearing part is easy to generate friction during operation and then cause loss, which will cause a certain degree of weight-bearing feeling on the running cost of the machine.
2.3.2 Twin-screw air compressor The core main motor of this specification is a motor with energy-saving mode. According to statistics, the air compressors of the first-line brand in the market are all in the form of twin-screw. The energy-saving structure of the motor is durable for the machine itself. Foundation. As far as the current situation is concerned, some national machine manufacturers such as Sweden, Japan, and the United States are not manufactured using single-screw air compressors.
2.4 Maintenance costs 2.4.1 Maintenance form The technology of single-screw air compressor is relatively mature without twin-screw air compressor. The existing industry standards and national standards do not include the technical scope of single-screw air compressor, so once the machine fails Then, only the manufacturer of the machine can explain the repair. The manufacturing cost of a single-screw air compressor is relatively low, but in actual operation, the friction generated between the planetary gear and the rotor causes the loss of the parts to reach the highest point, then the cumulative cost of replacement parts, maintenance and repair, the single screw air The cost of using the compressor will increase.
The share of twin-screw air compressors in the sales market is much larger than that of single-screw air compressors. The main factor is that the production and use technology of twin-screw air compressors is very mature. The manufacturing structure of single-screw air compressors As a result, the performance of the fuselage and the processing technology have plummeted, so it will be slightly inferior in technology. Although the twin-screw air compressor is high in price and the purchase cost is relatively high, the machine itself has strong operability, reliability, practicability, stability and applicability, so that the maintenance and repair costs in the later period are less. The frequency of machine failures is extremely low and will not substantially delay production.
2.4.2 Working parts The internal structure of the single-screw air compressor is composed of three rotating shafts, but the rigidity of the screw and planetary gear manufacturing materials is quite different. The deformation caused by the moving bow I is inevitable during operation. Uniform deformation causes the precision of the meshing between the screw and the gear to be out of control, resulting in a loss of volumetric efficiency. According to the current market situation, the planetary gears of the basically sold single-screw air compressors are made of resin, which is made of non-metallic materials. The sexual characteristics of October 2013 were poor wear resistance. In high-speed and high-efficiency sports, a large amount of mass loss occurs, causing an increase in internal leakage. In general, the applicability and economy of single-screw air compressors in industrial applications are poor, and the accuracy of the meshing is not high, which will cause the operation stability of the machine itself to be affected. , the cost is superimposed.
The twin-screw air compressor is structurally isolated by oil film, and there is no need to worry about the economic loss caused by the low precision of the meshing during use.
In summary, the maintenance cost of single-screw air compressor maintenance in daily use is much higher than the cost of twin-screw air compressor. In actual operation, the stability of single-screw air compressor is not high, and it is easy to cause failure; Because the twin-screw air compressor is mature in its own production technology and the internal parts are reasonable in structure, the probability of failure is very small, the daily maintenance work is very simple, and the maintenance cost is not high.
The single-screw air compressor has a unique working principle, but the single-screw type line is to pursue more perfect optimization. Because the machine itself still has certain operational problems and there is no better way to deal with the problem at present, resulting in a single Screw compressors have been somewhat restrained in the sales market. Therefore, for the R&D organization of single-screw air compressors, research investment should be increased. Manufacturers should also increase the production cost of single-screw air compressors and promote the development of single-screw air compressors in the market competition.
In the 20th century, twin-screw air compressors have been valued by many research institutes, and the machines produced by the manufacturers have been relatively stable, and have been successful in development and production. The market share is also very impressive. The screw air compressors used by domestic and foreign industrial enterprises are twin-screw, and the initial statistical market share is 99%. With the improvement of technology, the mechanical stability of the twin-screw air compressor is getting higher and higher, the power balance is better, and the maintenance and repair are convenient. As far as the current technology is concerned, the twin-screw air compressor is the most advanced and stable, and in practice, the application effect is very good, which also proves the maturity of the production technology. So far, the twin-screw air compressor has received extensive attention and application since its inception.
Zheng Jiaqiang, Chen Xiangdong, Zhao Yuejin. Analysis of the new national standard "Generally used fuel injection single screw air compressor". Compressor technology. 2010 (4): 64-67. P Cha Qian, Deng Qian, Cha Shi. Significant progress in single and twin screw compressor technology. Compressed the world. New progress in energy-saving long-life single-screw compressor technology |. General machinery. 2006 (1): 34-36. New developments in single and twin screw compressors. Compressor technology. 2005(1):27-.(Go down to page 33) Mechanical management development completed sound and light alarm.
Conclusion This is a brief set of electronic control system for mine ventilation equipment. In actual application, it can be adjusted according to actual conditions. Practice has proved that the set of electronic control. In October 2013, the system has reliable protection devices, which are convenient and reliable to operate. It can ensure the continuous benign operation and utilization of the fan, the number of maintenance is small, and the maintenance cost is low. It can fully meet the requirements of high efficiency ventilation and safe ventilation of coal mines. Worth promoting.
Mechanical management development (continued from page 24) (continued from page 28)
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