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选择空压机的基本准则是经济性、可靠性与安全性

(2009-04-08 08:09:27)
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      应考虑排气压力的高低和排气量大小。一般用途空气动力用压缩机排气压力为0.7MPa,老标准为0.8MPa。目前社会上有一种排气压力为0.5MPa的空压机,从使用角度看是不合理的,因为对风动工具而言其压力余量太小,输气距离稍远一些就不能使用。另外,从设计角度看,这种压缩机设计为一级压缩,压比太大,易引起排气温度过高,造成气缸积炭,导致事故发生。如果用户所用的压缩机大于0.8MPa,一般要特别制造,不能采取强行增压的办法,以免造成事故。  
   排气量是空压机的主要参数之一,选择空压机的气量要和所需的排气量相匹配,并留有10%的余量。如果用气量大而空压机排气量小,风动工具一开动,会造成空压机排气压力的大大降低,而不能驱动风动工具。当然盲目追求大排气量也是错误的,因为排气量越大压缩机配的电机越大,不但价格高,而且浪费购置资金,使用时也会浪费电力能源。
   另外,在选排气量时还要考虑高峰用量和通常用量及低谷用量。如果低谷用量较大,而通常用量和高峰用量都不大,国外通常的办法是以较小排气量的空压机并联取得较大的排气量,随着用气量增大而逐一开机,这样不但对电网有好处,而且能节约能源。   二是要考虑用气场合和条件。如用气场地狭小(船用、车用),应选立式;如用气场合有长距离的变化(超过500米),则应考虑移动式;如果使用场合不能供电,则应选择柴油机驱动式;如果使用场合没有自来水,就必须选择风冷式。
  在风冷、水冷两种冷却方式上,用户常有错误的认识,认为水冷好,其实不然。国内外小型压缩机中风冷式大约占到90%以上,这是因为在设计上风冷简便,使用时无需水源。而水冷式压缩机的致命缺点有四:必须有完备的上下水系统,投资大;水冷式冷却器寿命短;在北方冬季还容易冻坏气缸;在正常的运转中会浪费大量的水。

Should consider the level of exhaust pressure and engine size. General-purpose use of air power for the compressor discharge pressure 0.7MPa, the old standard of 0.8MPa. At present, there is a discharge pressure up to 0.5MPa of air compressor, from the use of point of view is not justified because of the stress风动工具in terms of their margin is too small, a little far away from a number of gas will not be able to use. In addition, from the design point of view, this compressor is designed to level compression, compression ratio too easy to cause the exhaust temperature is too high, resulting in the cylinder of carbon deposition, resulting in the accident. If the user of the compressor used in more than 0.8MPa, the general would like to manufacture, can not be pressurized to force the approach taken to avoid accidents.
Emissions are one of the main parameters of air compressor, air compressor selection and the capacity to match the requirements of displacement and 10% of headroom left. If displacement用气量large and small air compressor, one风动工具start, air compressor discharge pressure will cause the substantially reduced, and should not drive风动工具. Blind pursuit of large displacement of course is wrong, because the greater the displacement of the motor compressor with greater, not only high prices, but funding the purchase of waste, the use of electricity will also be a waste of energy.
In addition, the displacement at the election should also be considered when the peak usage and a low dosage and the amount usually. If the low amount of larger than usual amount of usage and the peak is not large, the usual approach abroad is relatively small displacement of the compressor to obtain a larger displacement in parallel, with each increase用气量boot, so that not only Power is good, but also save energy. Want to consider are two occasions and the conditions of gas. Venues such as small gas (ship, vehicle), elections should be vertical; occasions, such as gas changes have long-distance (over 500 meters), should be considered mobile; if the occasion should not use electricity, it should be diesel-driven selection style; If there is no occasion to use tap water, it is necessary to select air-cooled.
In air-cooled, water-cooled cooling method on two types of users often recognize the wrong that the water well, is not true. Small compressor at home and abroad in the air-cooled around 90% accounted for, this is because the design of simple air-cooled, use no water. The water-cooled compressor has four fatal disadvantage: It is necessary to have a complete water system from top to bottom investment; short life of water-cooled chillers; winter in the north also easily frozen cylinder; in the normal functioning of many waste water will be.

  

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