Composite molecular pump manufacturer

NegotiableUpdate on 01/15

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Overview

ZYFB-1200 Composite Molecular Pump Manufacturer: The composite molecular pump is a mechanical vacuum pump that obtains ultra-high vacuum by carrying gas molecules with a high-speed rotating rotor. It is composed of a turbo molecular pump and a disc traction pump. It has the characteristics of high pumping speed and compression ratio when the turbo molecular pump is used for molecular flow, and high pumping speed and compression ratio when the traction pump is under high pressure, which expands the application range of composite molecular pumps. The $n composite molecular pump has no selectivity or memory effect on the gas being pumped. Due to its high compression ratio for gases with large molecular weights, the pump does not require a cold trap or oil baffle to achieve clean high vacuum and ultra-high vacuum.

Product Details

ZYFB-1200Composite molecular pump manufacturer

classification

This type of pump can be specifically divided into:

1) The gas molecules of the traction molecular pump collide with the high-speed rotor to obtain momentum, and are driven to the outlet of the pump.

2) Turbomolecular pumps rely on the cooperation between high-speed rotating moving blades and stationary fixed blades to achieve pumping. This type of pump typically operates in a molecular flow state.

3) A composite molecular pump is a type of molecular vacuum pump that is composed of two types of molecular pumps, turbine type and traction type, connected in series.

structural characteristics

Composite molecular pump is a series combination of turbo molecular pump and traction molecular pump, integrating the advantages of both pumps. The pump has a high pumping speed and compression ratio over a wide pressure range (10-6~1Pa), greatly increasing the outlet pressure of the pump. A composite molecular pump produced by Alcatle in France, which uses gas static and dynamic seals, can achieve oil-free operation and directly exhaust to the atmosphere without the need for a front-end pump.

working conditions

(1) The rotor speed reaches 20000r/min, so the start-up time of the molecular pump is relatively long.

(2) The gas is in a molecular flow state, so a front-end pump is required, usually using a rotary vane pump as the front-end pump.

ZYFB-1200Composite molecular pump manufacturer

Design Key Points

In the design of composite molecular pumps, it is necessary to handle the matching and connection relationship between the turbine stage and the traction stage. Due to the large pumping area and high pumping speed of the turbine stage, while the groove pumping area of the traction stage is relatively small, the flow mode of gas molecules compressed by the turbine blades suddenly changes at the junction of the two structures, causing the movement of gas molecules to change from order to disorder at the junction, resulting in increased reflux and decreased pumping capacity. Therefore, a transition stage structure should be added at the transition between the turbine stage and the traction stage during design to improve the pumping performance of the pump.

With the continuous improvement of composite molecular pumps, their application fields are becoming more and more extensive. In some pumping systems, they can replace diffusion pumps, shorten the pumping time of the system, and obtain a clean vacuum environment without oil pollution.