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在實(shí)際使用中，一些無油真空泵用戶會(huì)發(fā)現(xiàn)無油真空泵對密閉容器抽氣，發(fā)現(xiàn)實(shí)際抽氣速率與泵說明書的抽氣速率存在差異，甚至有較大的差異。從原理上看，作為體積泵的一種，微型真空泵的抽氣速率僅由泵自身構(gòu)造決定。在排除泵工作故障、容器泄漏的情況下，其原因多來自抽氣管路。

In actual use, some non oil vacuum pump users will find no oil vacuum pump for airtight container pumping, found that the actual pumping rate and pump specifications of the pumping rate differences, and even greater differences. In principle, as one of the volume pumps, the pumping rate of the micro vacuum pump is determined only by the pump itself. In the case of pump failure and leakage of the container, the reasons are mostly from the gas extraction pipeline.

密閉容器的抽氣速率是被抽氣體在離開密閉容器處的速率，其影響因素有：

The extraction rate of a closed vessel is the rate at which the extracted gas moves away from the closed vessel, and the influencing factors are:

1、漏入密閉空間的外界空氣量。雖然有些密閉空間可以做到只有極低的空氣泄漏量，但幾乎沒有一個(gè)能達(dá)到完全氣密。必須考慮到空氣泄漏量。壓差越大泄漏泄漏也越大。

1. The amount of external air leaking into the confined space. Although some confined spaces can be operated with very low air leakage, almost none of them can be completely airtight. The amount of air leakage must be taken into account. The greater the pressure difference, the greater the leakage and leakage.

2、密閉空間中的可凝蒸氣量。對一個(gè)存在氣液兩相的密閉空間，在抽真空時(shí)，其液面上的可凝蒸氣也將被抽走，所以必須考慮這些可凝蒸氣的量。

2. Condensable steam in confined space. For a confined space with gas-liquid two-phase, the condensable vapor on the liquid surface will also be evacuated when the vacuum is evacuated, so the amount of condensable steam must be considered.

3、生產(chǎn)過程中釋放的氣體量。

3, the amount of gas released during the production process.

真空泵抽氣速率與密閉容器實(shí)際抽氣速率的關(guān)系如下。

The relationship between the pumping rate of vacuum pump and the actual pumping rate of airtight container is as follows.

真空泵與密閉容器之間一般均用管道連接。管道對氣體流動(dòng)有阻力，形成了壓降。

The vacuum pump and the airtight container are generally connected by pipes. The pipeline has a resistance to gas flow and a pressure drop is formed.

P1為密閉空間的壓力；

P1 is the pressure in confined space;

P2為真空泵入口的壓力;

P2 is the inlet pressure of the vacuum pump;

Q1，Q2分別為密閉空間和真空泵的抽氣流量，mmHg·m3/h；

Q1, Q2 is the pumping volume of confined space and vacuum pump, mmHg / m3/h;

S1，S2分別為密閉空間和真空泵的抽氣速率，m3/h。

S1 and S2 are the pumping rate of confined space and vacuum pump, respectively, m3/h.

其中，S1=Q1/P1，S2=Q2/P2。

Among them, S1=Q1/P1, S2=Q2/P2.

穩(wěn)定狀態(tài)時(shí)，Q1=Q2，故S1×P1=S2×P2，可知，S2=S1×（P1/P2）。

When stable, Q1=Q2, so S1 x P1=S2 x P2, knowable, S2=S1 x (P1/P2).

在任何操作情況下，要抽氣必然密閉空間的壓力大于空泵入口的壓力， P1>P2，（P1/P2）>1，故，S2>S1。

In any operation, the pressure in the confined space must be greater than the pressure at the inlet of the air pump, P1>P2, (P1/P2) >1, so S2>S1.

引入管道流體阻力（W）或流體通導(dǎo)能力（U）并分別定義為：W=（P1-P2）/Q，U=1/W，已知封閉空間抽氣速率S1，則推出：S2=S1/（1-S1/U）=S1/（1-WS1）。抽氣管道的壓力損失越小，S1和S2之差越小。只有當(dāng)管道阻力無限小或流體通導(dǎo)能力無限大時(shí)，真空泵的抽氣速率才等于密閉空間的抽氣速率。

The pipeline fluid resistance (W) or the fluid conductivity (U) are defined as W= (P1-P2) /Q, U=1/W, and the S2=S1/ (1-S1/U) =S1/ (1-WS1) is introduced when the pumping rate is S1 in the enclosed space. The smaller the pressure loss of the suction pipe, the smaller the difference between S1 and S2. The pumping rate of vacuum pump is equal to the pumping rate in confined space only when the pipeline resistance is infinite or the fluid conduction capacity is infinite.

抽氣管路的阻力對抽氣速率影響較大，實(shí)際使用中不可忽視。技術(shù)人員對各種型號(hào)微型真空泵的抽氣速率進(jìn)行了測試，連接11m長的抽氣管道時(shí)，抽氣速率甚至?xí)陆档竭B接1m長抽氣管道時(shí)的50-60%。真空泵性能說明書的抽氣速率是在標(biāo)準(zhǔn)實(shí)驗(yàn)條件下進(jìn)行的，而用戶實(shí)際的使用條件是千差萬別。為了保證抽氣速率，客戶使用時(shí)應(yīng)盡量縮短抽氣管道長度，增大管道口徑，減少彎頭、閥門等阻力元件。用戶在選用無油真空泵時(shí)，如果抽氣管路阻力較大，應(yīng)選用流量較大的型號(hào)。

The resistance rate of gas pumping exhaust pipe affect the actual use can not be ignored. The pumping rate of various types of micro vacuum pumps was tested by technicians. When the gas pipeline with 11m length was connected, the pumping rate would even drop to 50-60% when connecting 1m long suction pipe. The pumping rate of the performance specifications of vacuum pumps is carried out under the standard experimental conditions, while the actual conditions of users are varied. In order to ensure the pumping speed, customers should shorten the length of the gas extraction pipeline, increase the caliber of the pipeline, reduce the elbow, valve and other resistance components. In the selection of oil-free vacuum pump, if the suction pipe resistance is larger, the larger flow type should be selected.