總結(jié)而言，空壓機(jī)選擇的基本準(zhǔn)則有三條，可靠性、安全性與經(jīng)濟(jì)性。 一、機(jī)器的使用環(huán)境和條件。在場(chǎng)地?zé)o供水，場(chǎng)地狹小的情況下，選擇立式空壓機(jī);場(chǎng)地有長(zhǎng)距離的變動(dòng)(超過500米)，須考慮移動(dòng)式空壓機(jī);場(chǎng)地不能供電，則必須選擇風(fēng)冷式?？蛻魝兘?jīng)常錯(cuò)誤的認(rèn)為水冷式比較好，其實(shí)在國內(nèi)外小型空壓機(jī)中風(fēng)冷式占百分之九十以上。原因是風(fēng)冷式空壓機(jī)在設(shè)計(jì)上更加簡(jiǎn)潔，無需水源。水冷式空壓機(jī)必須具備完善的供水系統(tǒng)，投資大;水冷卻器壽命較短;運(yùn)行過程中大量浪費(fèi)水資源;北方冬季易凍壞氣缸。 二、所需壓縮空氣的質(zhì)量。一般的空壓機(jī)都含有一定的潤滑油，且含有水分，在禁油禁水的場(chǎng)合不僅要注意空壓機(jī)的選型，在必要的時(shí)候還要增加附屬裝置。此時(shí)可選擇無油空壓機(jī)。無油空壓機(jī)基本不含油，但潤滑不良，因此故障率高;此種空壓機(jī)因含有聚四氟乙烯，食品及制藥行業(yè)不能使用，無油空壓機(jī)只能做到不含油，但無法做到不含水。也可在空壓機(jī)后添加凈化裝置或干燥機(jī)，這種裝置能夠使空壓機(jī)不含油和水分，使含油水量在5ppm以下。 三、空壓機(jī)的排氣壓力及排氣量。常用的空壓機(jī)排氣壓力為0.7MPA，0.8MPA，目前社會(huì)上還有排氣壓力為0.5MPA的空壓機(jī)，輸氣距離過近。這種空壓機(jī)為一級(jí)壓縮，壓力比太大，易排氣溫度過高，造成氣缸積炭，導(dǎo)致事故的發(fā)生。大于0.8MPA的空壓機(jī)一般要特別制造，不可強(qiáng)行增壓?？諌簷C(jī)氣量的選擇要匹配所需的排氣量(并留有百分之十的余量)，空壓機(jī)最重要的參數(shù)之一就是排氣量。 四、運(yùn)行的可靠性?？諌簷C(jī)運(yùn)行時(shí)伴有升溫和壓力，運(yùn)行的安全性是最重要的，現(xiàn)在國家對(duì)空壓機(jī)的生產(chǎn)進(jìn)行規(guī)范化的“兩證”制度化管理，即空壓機(jī)生產(chǎn)許可證和壓力容器生產(chǎn)許可證。因此，在選擇空壓機(jī)時(shí)，一定要嚴(yán)格審查“兩證”，通常具備完善的產(chǎn)品質(zhì)量保證系統(tǒng)。
Analytical summary of the basic criteria for air compressor selection, there are three basic criteria for air compressor selection, reliability, safety and economy. 1. The working environment and conditions of the machine. In the case of no water supply and narrow site, vertical air compressor should be chosen; if the site has long-distance change (more than 500 meters), mobile air compressor should be considered; if the site can not supply electricity, air-cooled air compressor must be selected. Customers often mistakenly think that water-cooled type is better, in fact, air-cooled type accounts for more than 90% of small air compressors at home and abroad. The reason is that the air-cooled air compressor is more concise in design and does not need water source. Water-cooled air compressor must have perfect water supply system with large investment, short life of water cooler, a large amount of waste of water resources during operation, and easy to freeze cylinders in winter in North China. 2. The quality of compressed air required. General air compressors contain a certain amount of lubricating oil and water. In the case of oil prohibition and water prohibition, attention should be paid not only to the selection of air compressors, but also to the addition of ancillary devices when necessary. At this time, oil-free air compressor can be selected. Oil-free air compressor basically does not contain oil, but the lubrication is poor, so the failure rate is high; this kind of air compressor contains PTFE, food and pharmaceutical industry can not use, oil-free air compressor can only do without oil, but can not do without water. It is also possible to add a purifying device or a dryer after the air compressor, which can make the air compressor free of oil and water, so that the oil and water content is less than 5 ppm. 3. Exhaust Pressure and Exhaust Volume of Air Compressor. Commonly used air compressor exhaust pressure is 0.7 MPA, 0.8 MPA. At present, there are still air compressors with exhaust pressure of 0.5 MPA in society, and the distance of gas transmission is too close. This kind of air compressor is one-stage compression, the pressure ratio is too large, and the exhaust temperature is too high, resulting in carbon deposition in the cylinder, leading to accidents. Air compressors larger than 0.8MPA are usually specially manufactured and cannot be pressurized by force. The selection of air compressor volume should match the required exhaust volume (with a 10% margin). One of the most important parameters of air compressor is the exhaust volume. 4. Reliability of operation. Air compressor operation is accompanied by heating and pressure, the safety of operation is the most important. Now the state carries out standardized "two certificates" institutionalized management of the production of air compressor, that is, air compressor production license and pressure vessel production license. Therefore, when choosing air compressor, we must strictly examine the "two certificates", usually with a perfect product quality assurance system.
