Pumping method in a system for pumping and system of vacuum pumps

Abstract

The present invention relates to a pumping method in a pumping system (SP, SPP) comprising: a primary lubricated rotary vane vacuum pump (3) with a gas inlet port (2) connected to a vacuum chamber (1) and a gas outlet port (4) leading into a conduit (5) before coming out into the gas outlet (8) of the pumping system (SP, SPP), a non-return valve (6) positioned in the conduit (5) between the gas outlet port (4) and the gas outlet (8), and an ejector (7) connected in parallel to the non-return valve (6). According to this method, the primary lubricated rotary vane vacuum pump (3) is set into action in order to pump the gases contained in the vacuum chamber (1) through the gas outlet port (4). Simultaneously the ejector (7) is fed with working fluid, and the ejector (7) continues to be fed with working fluid all the while that the primary lubricated rotary vane vacuum pump (3) pumps the gases contained in the vacuum chamber (1) and / or all the while that the primary lubricated rotary vane vacuum pump (3) maintains a defined pressure in the vacuum chamber (1). The present invention also relates to a pumping system (SP, SPP) able to be used to implement this method.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to a pumping method making it possible to reduce the consumption of electrical energy as well as improve the performance in terms of flow rate and final vacuum in a pumping system in which the main pump is a lubricated rotary vane vacuum pump. The invention likewise relates to a pumping system which can be used to achieve the method according to the present invention.PRIOR ART[0002]The general tendencies to increase the performance of vacuum pumps, to reduce the costs of installations and the consumption of energy in industries have brought significant developments in terms of performance, energy economy, bulkiness, in the drives, etc.[0003]The state of the art shows that to improve the final vacuum and to reduce the consumption of energy supplementary stages must be added in vacuum pumps of the multi-stage Roots or multi-stage claw type. For screw vacuum pumps there must be additional turns of the screw and / or the ...

AI Technical Summary

Benefits of technology

The present invention provides a pumping method that reduces the energy and temperature of exhaust gas in a pumping system. The system requires minimal components, is simple and less expensive than existing systems. The method uses a primary lubricated rotary vane vacuum pump and an ejector, which works by reducing the difference in pressure between the chamber and the conduit. The ejector uses the residual pressure from the vacuum pump to suck in gas from the atmosphere or the gas exit conduit. A compressor can be used to provide the necessary gas flow, and the system can be controlled according to different parameters. The invention also reduces the space between the gas outlet of the vacuum pump and the non-return valve to lower the pressure more quickly.

Problems solved by technology

This type of systems is bulky, operates either with by-pass valves presenting problems of reliability or by employing means of measurement, control, adjustment or servo-control.

However, these means of control, adjustment or servo-control must be controlled in an active way, which necessarily results in an increase in the number of components of the system, its complexity and its cost.

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