Nanguang vacuum

The classification of vacuum pump

According to the work principle of vacuum pump, vacuum pump can be basically divided into two types, namely gas transmission pumps and gas capture pump. Along with the vacuum application technology in production and scientific research in the field of the application scope of the pressure needs more and more wide, mostly by several of the vacuum pump to vacuum suction system common suction to meet after production and scientific research process requirements, so choose different types of vacuum pump suction vacuum ChouQiJi group the situation more. For convenience, will these pump according to the work principle and the structure characteristic of some specific detailed classification is necessary. Now points above are as follows:

Gas transmission pumps
Gas transmission pump is a kind of gas continuously inhaling and exhaling, so as to achieve the purpose of the suction vacuum pump, the pump there are basically two types:

1) transfiguration vacuum pump

Transfiguration of vacuum pump is the periodical change of pump chamber volume to complete breathe in and exhaust the process of a vacuum pump. Gas discharge in before be compressed. This pump is divided into two kinds: reciprocating and rotational

(1) reciprocating pump is using vacuum pump: inside the cavity piston do reciprocating motion, inhaled, the gas compression and exhaling. Therefore, also called piston vacuum pump.

(2) the rotating vacuum pump is using pump chamber: the piston do the rotary motion, inhaled, the gas compression and exhaling. Rotating vacuum pump and the following three types:

(1) the vacuum pump oil seal: it is the use of oil seal all moving parts of the gap between, reduce harmful space of a revolving transfiguration vacuum pump. This usually with gas pump device, the town and say the vacuum pump gas. According to the structure characteristics are divided into the following five types.

A) spin chip vacuum pump: with certain rotor eccentricity installed in the pump housing and with the pump housing surface of fixed surface close to, in the rotor slot (with two or more than two) rotary-vane, as the rotor turns rotary-vane along the radial groove can reciprocating pump casing wall with sliding and always contact, the rotary-vane together with the rotor rotating, can be divided into several variable pump chamber volume.

B) rotary piston vacuum pump: in eccentric rotor external is equipped with a slide, rotor rotary pump driven along the wall sliding and rolling, shell and the upper part of the rotary piston rod can slide in can swing in the slide guide rail, and sliding pump chamber is divided into two variable volume.

C) will chip vacuum pump: in the pump housing is equipped with a and pump inside surface to the eccentricity of the rotor, near the pump housing is fitted with a always and rotor surface contact radial sliding-vane, as the rotor turns, sliding-vane can move on down, will pump chamber is divided into two variable volume.

D) cycloid vacuum pump more than in pump chamber eccentric with a type line more than for the rotor, it cycloid along the pump chamber wall rolled and will pump chamber is divided into two variable volume.

E) more spin room in a chip vacuum pump: the pump housing parallel by a the same motor drives DuoGe independent studio rotary-vane vacuum pump.

(2) the dry vacuum pump: it is a kind of need not oil (or liquid) seal of the transfiguration vacuum pump.

(3) liquid ring vacuum pump with many of the rotor blades: eccentric installed in the pump housing, when it turns, the liquid (normally water or oil) into the pump shell of concentric shells make pump liquid ring, with liquid ring rotor blades formed the volume cycles of several small volume, so also say the rotating transfiguration vacuum pump.

(4) the ROM watts vacuum pump: pump is placed in the two opposite direction synchronization double leaf form or more leaf form of rotor, between rotor and rotor pump shell wall all maintained between a space. It belongs to the rotating become vacuum pump. Machinery for this type of mudline booster pump that vacuum pump.

2) momentum transmission pumps

This pump is rely on high speed rotating blade or the jet, the momentum for gas or gas transmission molecules that gas continuously from the entrance of the pump transmission to export. Concrete can be divided into the following several types.

(1) the molecular vacuum pump: it is using high speed rotating rotor energy transmission give gas molecules, make of compressed, exhaust of a vacuum pump. It has the following three types:

(1) the traction molecular pump: gas molecules with high speed and movement of the rotor collide and gain momentum, and was sent to export, therefore, is a kind of momentum transmission pumps.

(2) the turbine molecular pump: pump is placed in the disk or with slot with the leaves of the rotor stator, it set pieces) disc (or between rotation. The circumference of the linear high rotor. This pump is usually in the molecules flow state work.

(3) : it is a complex molecules pump by turbine and traction type two kinds of molecular series pump combined a complex molecular vacuum pump.

(2) the spray vacuum pump: it is to use Venturi (Venturi) effect of the pressure drop of the gas jet produce high speed conveyor to export a momentum transmission pumps, suitable for stagnation in sticky and transitional flow state work. This pump and can be divided into the following several kinds: detailed

(1) the liquid injection vacuum pump, in liquid, normally water for work medium spray vacuum pump.

(2) the gas jet vacuum pump: to not condensable gases as medium of the spray vacuum pump.

(3) steam spray vacuum pump: to steam (water, oil or mercury and other steam) as a working medium spray vacuum pump.

(3) diffusion pump with low steam flow: high speed (such as oil or mercury vapor) as a working medium spray vacuum pump. Gas molecules spread to steam jet, was sent to export. In the jet of gas molecule density are still very low, this pump is suitable for molecular flow state work. Can be divided into:

(1) the purification diffusion pump: easy liquid pump volatile impurities of the special mechanical conveyor to export and not back to one of the boiler pump oil diffusion.

(2) the fractionation type pump: this pump has spread fractionation device, to allow the steam pressure lower working liquid steam into the high vacuum work, and steam pressure of nozzle higher working liquid steam into the vacuum of low, it is work nozzle a multi-level oil pump spread.

(4) diffusion jet pump is: it is a kind of spread of the single stage or pump characteristics of multistage spray nozzle with spray vacuum pump characteristics of the single stage or multistage spray nozzle of series a momentum transmission pumps. Oil that belong to this type mudline booster pump.

⑸ ion transport pump: it will be the gas in the electromagnetic field ionization or electric field, the function of transportation to export a momentum transmission pumps.

Gas capture pump
This pump is a kind of that gas molecular adsorption or condensed in the inner surface of the pump, thus reduce the tank of gas molecular number and achieve the purpose of the suction