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真空泵在真空優(yōu)先域的作用是從真空容器中抽出氣體分子，降低真空容器內(nèi)的氣體壓力，使之達(dá)到要求的真空度。隨著真空行業(yè)的應(yīng)用的迅速發(fā)展，很多廠商已經(jīng)研制出很多種類的真空泵，其抽氣速率從每秒零點(diǎn)幾升到每秒幾十萬(wàn)、數(shù)百萬(wàn)升。概括地講從大氣壓力到極高真空度是一個(gè)很大的范圍，至今為止還沒(méi)有一種真空系統(tǒng)能覆蓋這個(gè)范圍。有時(shí)為達(dá)到不同產(chǎn)品的工藝指標(biāo)、工作效率和設(shè)備工作壽命要求，不同的真空區(qū)段需要選擇不同的真空系統(tǒng)配置。

醫(yī)療器械、儀器儀表優(yōu)先域常常使用微型真空泵、氣體采樣泵，流量多在20L/min以下。微型真空氣泵種類繁多，常見(jiàn)的有旋片式泵、柱塞泵、薄膜泵等。為達(dá)到比較好的配置，選擇微型真空氣泵時(shí)，應(yīng)考慮以下各點(diǎn)：

1、確定工作真空范圍。每一個(gè)行業(yè)都有其適應(yīng)的真空度范圍，必須確定該行業(yè)所要求的真空度。對(duì)于氣體采樣泵而言，若是采集的氣體本身有一定負(fù)壓，那么真空度參數(shù)也必須考慮。

2、確定極限真空度。在確定了行業(yè)要求的真空度的基礎(chǔ)上檢查真空泵系統(tǒng)的極限真空度，因?yàn)闃O限真空度決定了真空泵的工作真空度。一般來(lái)講，系統(tǒng)的極限真空度比系統(tǒng)的工作真空度低20%，比前級(jí)泵的極限真空度低50%。儀器常用的微型真空氣泵一般真空度可以達(dá)到10kPa。

3、確定抽氣的種類、性質(zhì)與抽氣量。如果輸送高溫、腐蝕性的氣體需要特制的隔膜泵。各款微型真空泵的結(jié)構(gòu)原理不同，有的微型真空泵需要使用潤(rùn)滑、密封液體，可能與輸送的氣體發(fā)生反應(yīng)，有的則可能產(chǎn)生磨損，還得考慮被抽氣體的污染問(wèn)題。微型隔膜泵運(yùn)動(dòng)機(jī)構(gòu)與輸送介質(zhì)完全隔離，具有不污染介質(zhì)，無(wú)泄漏的突出優(yōu)點(diǎn)，但抽氣量不如旋片式真空泵。

綜上，微型泵、采樣泵的性價(jià)比。泵的價(jià)格與性能密切相關(guān)。生產(chǎn)高真空度、大流量、可靠性好、壽命長(zhǎng)的微型泵，需要廠家具有先進(jìn)的流體技術(shù)和豐富的經(jīng)驗(yàn)、優(yōu)質(zhì)的材料、高精度的機(jī)械加工和裝配，還要經(jīng)過(guò)長(zhǎng)期的實(shí)驗(yàn)、嚴(yán)格的檢驗(yàn)挑選。過(guò)高的技術(shù)指標(biāo)會(huì)導(dǎo)致泵的成本大幅度上升。真空度越高，抽氣速率越大、壽命越長(zhǎng)的真空泵價(jià)格也就越貴，所以選擇真空泵時(shí)一定要根據(jù)儀器的實(shí)際情況來(lái)選擇！

The role of vacuum pump in the vacuum field is to extract gas molecules from the vacuum container, reduce the pressure of the gas in the vacuum container, and make it reach the required vacuum degree. With the rapid development of the application of vacuum industry, many manufacturers have developed many kinds of vacuum pump, its pumping rate from a few tenths of a liter per second to hundreds of thousands of liters per second, millions of liters. Generally speaking, there is a wide range from atmospheric pressure to extremely high vacuum, and so far no vacuum system can cover this range. Sometimes in order to meet the requirements of different product process indicators, working efficiency and equipment working life, different vacuum sections need to choose different vacuum system configuration.

Micro vacuum pump and gas sampling pump are often used in the field of medical instruments and instruments, with the flow rate below 20L/min. There are many kinds of micro vacuum air pumps, common rotary vane pumps, plunger pumps, film pumps and so on. In order to achieve the best configuration, the following points should be considered when selecting the micro vacuum air pump:

1. Determine the working vacuum range. Each industry has its own suitable vacuum range, the industry must first determine the vacuum required. For the gas sampling pump, if the gas itself has a certain negative pressure, then the vacuum parameters must also be considered.

2, determine the ultimate vacuum degree. Check the limit vacuum of vacuum pump system on the basis of determining the vacuum degree required by the industry, because the limit vacuum degree determines the best vacuum degree of vacuum pump. In general, the ultimate vacuum of the system is 20% lower than the operating vacuum of the system and 50% lower than the ultimate vacuum of the front stage pump. Instrument commonly used micro vacuum air pump vacuum degree can reach 10kPa.

3, determine the type, nature and pumping gas. If the delivery of high temperature, corrosive gas needs special diaphragm pump. The structure principle of each miniature vacuum pump is different. Some miniature vacuum pumps need to use lubrication and sealing liquid, which may react with the gas transported. Some may produce wear and tear, and also have to consider the pollution problem of the gas pumped. Micro diaphragm pump movement mechanism and transmission medium completely isolated, with no pollution medium, no leakage outstanding advantages, but the pumping volume is not as rotary vane vacuum pump.

To sum up, the cost performance of micro pump and sampling pump. Pump price is closely related to performance. The production of high vacuum, large flow, good reliability, long life of micro pumps, manufacturers need to have advanced fluid technology and rich experience, high-quality materials, high-precision machining and assembly, but also through long-term experiments, strict inspection selection. High technical indicators will lead to a substantial increase in pump costs. The higher the vacuum, the higher the pumping rate, the longer the life of the vacuum pump price is more expensive, so the choice of vacuum pump must be based on the actual situation of the instrument to choose!