Vacuum generation system for sealed cavity

Abstract

The vacuum generation system is installed on a vacuum bin body, an air extraction opening and two air inlets are formed in the outer surface of one side of the vacuum bin body, the inner walls of the ends, close to the interior of the vacuum bin body, of the air extraction opening and the air inlets are each provided with a flange part extending inwards in the radial direction, and the flange parts are connected with the air extraction opening and the air inlets. A first flange plate is embedded in the air extraction opening, a second flange plate is embedded in the air inlet, a connecting base is installed on the air extraction opening, a piston rod of the first air cylinder is connected with the first flange plate through a first core shaft, and an elastic piece is arranged on the first core shaft in a sleeved mode. The end, close to the first flange plate, of the elastic piece makes contact with the outer flange part located at the tail end of the first mandrel, and the other end of the elastic piece is in extrusion connection with a shell of the first air cylinder. The sealing performance of the first flange plate to the extraction opening in the long-term use process can be improved, impact caused by too fast contraction can be prevented in the opening process of the first flange plate, and the service life of the mechanism is prolonged.

Description

technical field [0001] The invention relates to the technical field of vacuum cavity sealing, in particular to a vacuum generating system for sealing a cavity. Background technique [0002] The vacuum chamber is mainly used in the field of product dispensing and packaging. Using the force of negative pressure, the air in the vacuum box is first pumped away during the pouring process, and then the product is poured, which can quickly penetrate the glue into the product and inject shock. And the bubbles generated by the contact between the glue and the product can also be quickly removed under the action of negative pressure, thus ensuring the high performance of the product. In the prior art, when the cavity is evacuated, due to the large pressure difference between the air pressure in the cavity and the outside air pressure, and the time delay when the valve is closed, the vacuum value in the cavity is unstable. In addition, the adsorption force generated by the large inter...

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Problems solved by technology

In the prior art, when the chamber is evacuated, due to the large pressure difference between the air pressure in the chamber and the outside air pressure, and the time delay when the valve is closed, the vacuum value in the chamber will be unstable.

Moreover, the adsorption force generated by the large internal and external pressure difference has a high output power requirement for the valve closing mechanism, and the valve opening and closing mechanism with large kinetic energy will cause impact on the cavity and reduce its service life.

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