What factors affect the performance of vacuum generators

What factors can affect the performance of vacuum generators? The following together to understand.

1. Analysis of the characteristics of the pressure Pv at the suction inlet: the more ideal Pv characteristics of the vacuum generator, required in the commonly used supply pressure range (P01 = 0.4 – 0.5MPa), Pv in the minimum value, and with Pv1 changes gently.
2. The relationship between the pressure at the suction inlet Pv and the suction flow rate under specific noisy and closed suction inlet conditions. To get an ideal matching relationship between the pressure at the suction inlet and the suction flow, it can be designed as a multi-stage vacuum generator combined in series.
3. Vacuum generator should reduce their air consumption (L/min) to meet the requirements of use. Air consumption is related to the supply pressure of compressed air. The higher the pressure is, the larger the air consumption of the vacuum generator is.

1. The length of the diffusion pipe should ensure that the various wave systems at the nozzle outlet are fully developed so that an approximate uniform flow can be obtained at the outlet section of the diffusion pipe. But the pipe is too long, and the friction loss of the pipe wall increases. General pipework for the pipe diameter of 6 – 10 times more reasonable. To reduce energy loss, it can be added to the outlet of the diffusion pipe straight pipe expansion angle of 6 ° – 8 ° expansion section.
2. Suction response time is related to the volume of the adsorption chamber (including diffusion chamber, adsorption pipe, and suction cup or closed chamber volume, etc.), and the amount of leakage from the adsorption surface is related to the size of the required pressure at the suction inlet. For a specific pressure requirement at the suction inlet, the smaller the volume of the adsorption chamber, the shorter the response time; if the pressure at the suction inlet is higher, the smaller the adsorption volume, the smaller the surface leakage, the shorter the suction response time; if the adsorption volume is large, and the suction speed should be fast, the nozzle diameter of the vacuum generator should be more significant.