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。在場地?zé)o供水，場地狹小的情況下，選擇立式空壓機(jī);場地有長距離的變動(超過500米)，須考慮移動式空壓機(jī);場地不能供電，則必須選擇風(fēng)冷式。客戶們經(jīng)常錯誤的認(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。空壓機(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)檢查井鋼模具 隔離墩模具 隔離墩鋼模具 流水槽模具 U型槽模具 螺桿啟閉機(jī) 卷揚(yáng)式啟閉機(jī) 銅雕佛像 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
