工程上，為了與各種各樣的工作要求相適應，通過改變噴嘴、擴張管的尺寸、形狀及組合方法，使真空發生器的到達真空度、排氣量、壓縮空氣流量有差異。而在本體上組合控制系統、防塵系統、消音系統中諸如電磁閥、真空開關、過濾器、消音器等，它會使之性能更趨完善。圖3 為日本（株）妙德會社CDE 型真空發生器結構示意圖。
圖3 VCD型真空發生器結構示意圖 圖4真空吸著過程示意圖
2種用途的吸著過程如圖4所示。圖中t1為真空發生時間；t2 為工件吸著時間；t3 為搬運時間；t4為真空破壞時間；ts 為搬運周期。裝在自動機械上的真空吸盤與工件接觸形成密閉空間，然后真空發生器開始工作，壓縮空氣流量開始急劇上升；同時密閉腔的空氣迅速排出，隨著密閉腔空氣量的減少，排氣量迅速下降；密閉腔內真空度很快提高，達到一定真空度后，自動機械運動，帶動真空吸盤和工件到達所需工位。
In engineering, in order to adapt to a variety of work requirements, by changing the size, shape and combination method of nozzle and expansion tube, the vacuum degree, exhaust volume and compressed air flow of vacuum generator are different. The combination of control system, dust-proof system and silencing system, such as solenoid valve, vacuum switch, filter and muffler, will improve its performance. Fig. 3 is the structural diagram of CDE vacuum generator of miaodee society of Japan.
Fig. 3 structure diagram of VCD vacuum generator Fig. 4 vacuum suction process diagram
Vacuum generator is widely used in electronics, steel, chemical industry, construction, food and other industries. It mainly plays the following roles in automatic machinery
Vacuum suction handling. The vacuum generator is combined with the vacuum sucker, and the workpiece is adsorbed by the generated vacuum, and the workpiece is sent to the required station.
Vacuum suction fixation. The thin workpieces which are easy to produce elastic deformation are fixed by vacuum suction for grinding.
The sorption process of the two uses is shown in Figure 4. In the figure, T1 is the vacuum occurrence time; T2 is the workpiece suction time; T3 is the handling time; T4 is the vacuum failure time; ts is the handling cycle. First, the vacuum suction cup installed on the automatic machine contacts with the workpiece to form a closed space, and then the vacuum generator starts to work, and the compressed air flow begins to rise sharply; at the same time, the air in the closed cavity is discharged rapidly, and with the reduction of the air volume in the closed cavity, the exhaust volume decreases rapidly; the vacuum degree in the closed cavity increases quickly, and after reaching a certain vacuum degree, the automatic machine moves to drive the vacuum The suction cup and workpiece arrive at the required position.
At the end of transportation, in order to make the workpiece out of the suction cup as soon as possible, the method of blowing compressed air into the vacuum suction cup is adopted to quickly destroy the vacuum. The vacuum generator consumes a certain amount of compressed air in the process of suction transportation from the occurrence of vacuum to the destruction of vacuum. For fully automatic continuous operation machinery, compressed air consumption is very large. In this paper, from the perspective of energy-saving use of vacuum generator, we discuss how to find the best energy-saving scheme under certain conditions.