Flow quantity self-adjusting jetting stream vacuum generator

Abstract

The invention discloses a flow auto-adjustment jet flow vacuum generating device, comprising a section of flow auto-adjustment and a vacuum generating section. A needle valve used for adjustment is positioned at the front of a jet nozzle throat of the vacuum generating section. Meanwhile the needle valve can feed back the vacuum pressure to a right cavity of an active cylinder of the vacuum generating device to make a pressure difference between the right cavity and a left cavity of the active cylinder which is communicated with the atmosphere to drive the active valve and to drive the passive valve through magnetic driving, finally to drive the needle valve which is fixedly connected with the passive valve to move. The invention not only realizes the dual purposes of fast response in vacuum and saving energy sources, but also realizes the auto adjustment to the flow of air supply for the position of the needle valve can be adjusted according to vacuum level. Meanwhile, if the vacuum level changes, the needle valve can look for a new balance point automatically. Thus the vacuum generating device has the function of automatic adjustment of the air supply flow and is suitable for various working conditions.

Description

a technical field [0001] The invention relates to a vacuum generating device, in particular to a flow self-regulating jet vacuum generator. Two background technology [0002] At present, there are two types of vacuum generators commonly used: vacuum pumps and vacuum generators. The vacuum generator is composed of a Laval nozzle that contracts first and then expands, a vacuum chamber and a receiving tube, and has an air supply port, an exhaust port and a vacuum port. When the gas supply pressure is higher than a certain value, a supersonic jet is ejected from the Laval nozzle, and under the effect of gas viscosity, the high-speed jet entrains the gas in the vacuum chamber to form a very low vacuum degree in the vacuum chamber. When the air supply pressure is constant, it can be approximately considered that the flow rate of the air supply is directly proportional to the effective cross-sectional area of ​​the nozzle. Compared with vacuum pumps, vacuum generators have been w...

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Problems solved by technology

However, this parallel vacuum generating device cannot adapt to various complex working conditions in production because there are only two sizes of nozzles.

Although the patent application CN200510050203 proposes a reconfigurable modular design, it is proposed to obtain the same series of vacuum generators with different specifications by replacing the nozzle and expansion tube, but this method increases the cost of the user

At the same time, this dual-nozzle parallel vacuum generator cannot adjust the flow rate of the vacuum nozzle in real time according to the value of the vacuum degree

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