Air jet vacuum pump

Air injection vacuum pump of working principle

Purpose of air jet vacuum pump According to the performance of air jet vacuum pump, in a variety of applications of vacuum systems, can be used as the following pumps. Main pump: Used in a vacuum system to obtain the required vacuum.

Air jet vacuum pump

Crude pumping: Starting at atmospheric pressure, reducing the pressure of the system to the level at which the other pumping system begins to operate. Forestage pump: a vacuum pump used to maintain the forestage pressure of another vacuum pump below the maximum allowable forestage pressure. The front pump can also be used as a crude pumping pump. Maintenance pump: when the pumping volume is very small, the main front stage pump cannot be effectively used.

A auxiliary front stage pump with a small capacity is needed in the vacuum system to maintain the normal operation of the main pump.

The internal components of the jet vacuum pump are mainly composed of Laval nozzle and diffuser. The structure of the single-stage steam jet pump is basically the same as that of other levels. Its working process can be divided into three stages: adiabatic expansion stage, mixing stage and compression stage.

1. In the adiabatic expansion stage, after the working steam passes through the zoom nozzle, the pressure can be converted into velocity energy and enters the diffuser at a very high speed. At the same time, the working steam pressure drops at the exit of the nozzle, forming a vacuum to suck in the pumped gas;

2. In the mixing stage, the pumped gas enters the diffuser. In the diffuser, the steam collides and mixes with the pumped gas for energy exchange.

3. In the compression stage, after passing through the throat of the diffuser, the mixture velocity decreases and the pressure rises further. At the outlet of the diffuser reaches atmospheric pressure or the inlet pressure of the rear stage injector, the pumped gas is discharged;

The jet vacuum pump can better withstand temperature changes, so the pump can withstand higher temperature than the same type of pump without affecting its service life. The pump is widely used in the electronic industry, such as tube, picture tube, X-ray tube, as well as the refining and purification of semiconductor monocrystalline silicon, high boiling point oil distillation and purification separation, fluorescent lamp, vacuum flask high vacuum exhaust instrument.

(The article comes from the Internet. If reprinting is not allowed, please contact our company to delete it.)

Contact us

If possible, kindly suggest please your working industry/process, working pressure, working medium, etc. Given detailed request helps to gain better-matched customized solution. Thanks for your patience.

your request will be responsed within 3 hours, kindly pay attention to your email please.


dry screw vacuum pump in wood processing industry

Posted on Tue, 01 Feb 2022 07:02:47 +0000

Explosion proof and high temperature resistant vacuum unit

Posted on Wed, 10 Nov 2021 07:30:11 +0000

vacuum pumps for chemical industry has high requirements

Posted on Mon, 08 Nov 2021 08:52:52 +0000

What are the applications of roots vacuum units in medicine?

Posted on Wed, 03 Nov 2021 07:57:18 +0000

The advantages of dry screw vacuum pumps make up for the disadvantages of oil-sealed vacuum pumps

Posted on Tue, 02 Nov 2021 09:05:35 +0000

dry vacuum pump for measures to avoid oil return

Posted on Thu, 28 Oct 2021 09:03:25 +0000