選擇空壓機的基本準則是什么？

一、是應考慮排氣壓力的高低和排氣量大小。一般用途空氣動(dòng)力用壓縮機排氣壓力為

1、 It should consider the level of exhaust pressure and exhaust volume. The discharge pressure of general purpose air power compressor is

0.7MPa，老標準為0.8MPa。目前社會(huì )上有一種排氣壓力為0.5MPa的空壓機，從使用角度看是不合理的，因為對風(fēng)動(dòng)工具而言其壓力余量太小，輸氣距離稍遠一些就不能使用。另外，從設計角度看，這種壓縮機設計為一級壓縮，壓比太大，易引起排氣溫度過(guò)高，造成氣缸積炭，導致事故發(fā)生。如果用戶(hù)所用的壓縮機大于0.8MPa，一般要特別制造，不能采取強行增壓的辦法，以免造成事故。

7 MPa, the old standard is 0. 8 MPa. At present, there is an air compressor with the exhaust pressure of 0.5MPa in the society, which is unreasonable from the point of view of use, because for the pneumatic tools, the pressure margin is too small, and the gas transmission distance is a little longer, so it can't be used. In addition, from the design point of view, this kind of compressor is designed as one-stage compression. If the pressure ratio is too large, it is easy to cause the exhaust temperature to be too high, resulting in carbon deposition in the cylinder and accidents. If the compressor used by the user is greater than 0.8MPa, it should be specially manufactured, and the forced pressurization method should not be adopted to avoid accidents.

排氣量是空壓機的主要參數之一，選擇空壓機的氣量要和所需的排氣量相匹配，并留有

Exhaust volume is one of the main parameters of the air compressor. The air volume of the air compressor should match the required exhaust volume, and there should be enough space

10％的余量。如果用氣量大而空壓機排氣量小，風(fēng)動(dòng)工具一開(kāi)動(dòng)，會(huì )造成空壓機排氣壓力的大

10% margin. If the air consumption is large and the air compressor exhaust volume is small, once the pneumatic tool is started, the air compressor exhaust pressure will be large

大降低，而不能驅動(dòng)風(fēng)動(dòng)工具。當然盲目追求大排氣量也是錯誤的，因為排氣量越大壓縮機配的電機越大，不但高，而且浪費購置資金，使用時(shí)也會(huì )浪費電力能源。

Large reduction, but not drive pneumatic tools. Of course, it is also wrong to blindly pursue large exhaust volume, because the larger the exhaust volume is, the larger the motor of the compressor is, which is not only expensive, but also a waste of purchase funds and electric energy.

另外，在選排氣量時(shí)還要考慮高峰用量和通常用量及低谷用量。如果低谷用量較大，而通

In addition, the peak consumption, the normal consumption and the low consumption should be considered when selecting the exhaust volume. If the low consumption is large, and pass

常用量和高峰用量都不大，國外通常的辦法是以較小排氣量的空壓機并聯(lián)取得較大的排氣量，

The commonly used quantity and peak consumption are not large, and the common way abroad is to use air compressors with smaller exhaust quantity in parallel to obtain larger exhaust quantity,

隨著(zhù)用氣量增大而逐一開(kāi)機，這樣不但對電網(wǎng)有好處，而且能節約能源。

With the increase of gas consumption, start up one by one, which not only benefits the power grid, but also saves energy.

二、是要考慮用氣場(chǎng)合和條件。如用氣場(chǎng)地狹小(船用、車(chē)用)，應選立式；如用氣場(chǎng)合有長(cháng)

2、 It is necessary to consider the conditions of gas field. If the gas field is narrow (for ships and vehicles), it should be vertical; if the gas field is long, it should be vertical

距離的變化(超過(guò)500米)，則應考慮移動(dòng)式；如果使用場(chǎng)合不能供電，則應選擇柴油機驅動(dòng)式；如果使用場(chǎng)合沒(méi)有自來(lái)水，就必須選擇風(fēng)冷式。

If the distance changes (more than 500 meters), the mobile type should be considered; if the use of occasions can not supply power, the diesel engine driven type should be selected; if there is no running water in the use of occasions, the air-cooled type must be selected.

在風(fēng)冷、水冷兩種冷卻方式上，用戶(hù)常有錯誤的認識，認為水冷好，其實(shí)不然。國內外小

In terms of air cooling and water cooling, users often have a wrong idea that water cooling is good, but it is not. Small enterprises at home and abroad

型壓縮機中風(fēng)冷式大約占到90％以上，這是因為在設計上風(fēng)冷簡(jiǎn)便，使用時(shí)無(wú)需水源。

The air-cooled type accounts for more than 90% of the total air-cooled compressors. This is because the air-cooled compressor is simple in design and no water source is needed in use.

而水冷式壓縮機的致命缺點(diǎn)有四：必須有完備的上下水系統，投資大；水冷式冷卻器壽命

The fatal shortcomings of water-cooled compressor are four: it must have a complete water supply and drainage system, large investment; the service life of water-cooled cooler

短；在北方冬季還容易凍壞氣缸；在正常的運轉中會(huì )浪費大量的水。

Short; in the north, it is easy to freeze the cylinder in winter; a lot of water will be wasted in normal operation.

三、是要考慮壓縮空氣質(zhì)量。一般空壓機產(chǎn)生的壓縮空氣均含有一定量潤滑油，并有一定量

3、 Is to consider the quality of compressed air. Generally, the compressed air produced by air compressor contains a certain amount of lubricating oil and a certain amount of oil

的水，有些場(chǎng)合是禁油和禁水的，這時(shí)不但對壓縮機選型要注意，必要時(shí)要增加附屬裝置。

In some cases, oil and water are forbidden. At this time, attention should be paid not only to the selection of compressor, but also to the addition of auxiliary devices when necessary.

解決的辦法：一是選用無(wú)潤滑壓縮機。這種壓縮機氣缸中基本上不含油，其活塞環(huán)和填料

The solution: one is to choose non lubricated compressor. This kind of compressor cylinder basically does not contain oil, its piston ring and packing

一般為聚四氟乙烯。但這種機器也有缺點(diǎn)，潤滑不良，故障率高；聚四氟乙烯也是一種有害物質(zhì)，食品、制藥行業(yè)不能使用；無(wú)潤滑壓縮機只能做到輸氣不含油，不能做到不含水。第二種也是常用的方法，是將空壓機(無(wú)論哪種)再加一級或二級凈化裝置或干燥器。這種裝置可使壓縮機空氣既不含油又不含水，使壓縮空氣中的含油水量在5ppm以下，可滿(mǎn)足工藝要求。

It is usually polytetrafluoroethylene. But this kind of machine also has some disadvantages, such as bad lubrication and high failure rate; PTFE is also a harmful substance, which can not be used in food and pharmaceutical industries; the unlubricated compressor can only transport gas without oil, and can not do without water. The second is also commonly used method, is the air compressor (no matter which) plus one or two purification device or dryer. This device can make the air of the compressor contain neither oil nor water, and the oil and water content in the compressed air is less than 5ppm, which can meet the process requirements.

四、是要考慮壓縮機運行的性?？諌簷C是一種帶壓工作的機器，工作時(shí)伴有溫升和壓

4、 It is necessary to consider the safety of compressor operation. Air compressor is a kind of machine with pressure, which is accompanied by temperature rise and pressure drop

力，其運行的性要放在首位。對壓縮機的生產(chǎn)實(shí)行規范化的“兩證”制度，即壓縮機生產(chǎn)許可證和壓力容器生產(chǎn)許可證(儲氣罐)。因此，在選購壓縮機產(chǎn)品時(shí)，要嚴格審查“兩

The safety of its operation should be put in the first place. The State implements the standardized "two licenses" system for the production of compressors, i.e. compressor production license and pressure vessel production license (gas storage tank). Therefore, in the purchase of compressor products, it is necessary to strictly review the "two aspects"

證”。通常有證廠(chǎng)家的產(chǎn)品質(zhì)量保證系統是完善的，不會(huì )出現大的質(zhì)量問(wèn)題， 即使出現一些問(wèn)題，也會(huì )由廠(chǎng)家負責三包。

This is the first time that we have been able to find the evidence. Generally, the product quality assurance system of a certified manufacturer is perfect, and there will be no major quality problems. Even if there are some problems, the manufacturer will be responsible for the three guarantees.