空壓機選擇的基本準則有三條，可靠性、安全性與經濟性。 一、機器的使用環境和條件。在場地無供水，場地狹小的情況下，選擇立式空壓機;場地有長距離的變動(超過500米)，須考慮移動式空壓機;場地不能供電，則必須選擇風冷式。客戶們經常錯誤的認為水冷式比較好，其實在國內外小型空壓機中風冷式占百分之九十以上。原因是風冷式空壓機在設計上更加簡潔，無需水源。水冷式空壓機必須具備完善的供水系統，投資大;水冷卻器壽命較短;運行過程中大量浪費水資源;北方冬季易凍壞氣缸。 二、所需壓縮空氣的質量。一般的空壓機都含有一定的潤滑油，且含有水分，在禁油禁水的場合不僅要注意空壓機的選型，在必要的時候還要增加附屬裝置。此時可選擇無油空壓機。無油空壓機基本不含油，但潤滑不良，因此故障率高;此種空壓機因含有聚四氟乙烯，食品及制藥行業不能使用，無油空壓機只能做到不含油，但無法做到不含水。也可在空壓機后添加凈化裝置或干燥機，這種裝置能夠使空壓機不含油和水分，使含油水量在5ppm以下。 三、空壓機的排氣壓力及排氣量。常用的空壓機排氣壓力為0.7MPA，0.8MPA，目前社會上還有排氣壓力為0.5MPA的空壓機，輸氣距離過近。這種空壓機為一級壓縮，壓力比太大，易排氣溫度過高，造成氣缸積炭，導致事故的發生。大于0.8MPA的空壓機一般要特別制造，不可強行增壓。空壓機氣量的選擇要匹配所需的排氣量(并留有百分之十的余量)，
There are three basic criteria for selecting an air compressor: reliability, safety, and economy. 1、 The operating environment and conditions of the machine. When there is no water supply on the site and the site is narrow, choose a vertical air compressor; Long distance changes to the site (exceeding 500 meters) require consideration of mobile air compressors; If the site cannot be powered, it must be air-cooled. Customers often mistakenly believe that water cooling is better, but in fact, wind cooling accounts for more than 90% of small air compressors both domestically and internationally. The reason is that air-cooled air compressors are designed more simply and do not require water sources. The water-cooled air compressor must have a complete water supply system and a large investment; The lifespan of the water cooler is relatively short; A large amount of water resources are wasted during operation; The cylinders in northern winter are prone to freezing and damage. 2、 The quality of compressed air required. Generally, air compressors contain a certain amount of lubricating oil and moisture. In situations where oil and water are prohibited, it is not only important to pay attention to the selection of air compressors, but also to add auxiliary devices when necessary. At this point, an oil-free air compressor can be selected. Oil free air compressors generally do not contain oil, but their lubrication is poor, resulting in a high failure rate; This type of air compressor cannot be used in the food and pharmaceutical industry due to the presence of polytetrafluoroethylene. Oil free air compressors can only be oil-free, but cannot be water free. Purification devices or dryers can also be added after the air compressor, which can make the air compressor free of oil and water, and keep the oil and water content below 5ppm. 3、 The exhaust pressure and volume of the air compressor. The commonly used air compressors have exhaust pressures of 0.7MPA and 0.8MPA. Currently, there are also air compressors with exhaust pressures of 0.5MPA in society, and the gas transmission distance is too close. This type of air compressor is a first stage compression, and if the pressure ratio is too high, it is prone to high exhaust temperature, causing carbon deposits in the cylinder and leading to accidents. Air compressors larger than 0.8MPA generally need to be specially manufactured and cannot be forcibly pressurized. The selection of air compressor volume should match the required exhaust volume (with a 10% margin),
