The structure of the pressure equalizing angle valve of the nitrogen making device

Abstract

The invention discloses a pressure equalizing bevel angle valve structure of a nitrogen-making device. The pressure equalizing bevel angle valve structure comprises a valve element, a valve rod and an air cylinder, the air cylinder comprises a cylinder body, a piston, a piston rod and a return spring, the piston, the piston rod and the return spring are arranged in the cylinder body, the two ends of the valve rod are fixedly connected with one end of the valve element and one end of the piston rod respectively, and the other end of the piston rod is fixedly connected with one end of the piston; the air cylinder further comprises a piston rod extension portion, the cylinder body is divided into two cavities through the piston, the cavity close to the valve element is a compressed air containing cavity, the return spring is arranged in the other cavity, a part of the piston rod extension portion is located in the cavity where the return spring is arranged, one end of the piston rod extension portion is fixedly connected with the piston, the other end of the piston rod extension portion is located outside the air cylinder, the valve element is further provided with a through hole penetrating through the two end faces of the valve element, and the end, away from the air cylinder, of the valve element is further provided with a rubber layer. The pressure equalizing bevel angle valve structure is beneficial for judging the piston movement situation of a bevel angle valve, prolonging the service life of the bevel angle valve and enhancing the regeneration effect of an adsorption tank.

Description

technical field [0001] The invention relates to the technical field of pressure swing adsorption nitrogen production equipment, in particular to a pressure equalizing bevel valve structure of a nitrogen production device. Background technique [0002] The pressure swing adsorption method is a new gas separation technology, which has been developed rapidly abroad since the late 1960s and early 1970s. Its principle is to separate the gas mixture by using the difference in the "adsorption" performance of molecular sieves for different gas molecules. Using air as raw material, nitrogen and oxygen in the air are separated by using a high-efficiency, high-selection solid adsorbent to selectively adsorb nitrogen and oxygen. [0003] The core equipment of the existing pressure swing adsorption nitrogen production device mostly adopts two pressure swing adsorption towers, and activated carbon molecular sieves are installed in the adsorption towers, and the two pressure swing adsorpti...

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Problems solved by technology

[0004] In view of the above prior art, the spool and the piston at both ends of the valve stem are respectively located in the valve seat and the cylinder body, which makes it difficult to judge the stroke of the spool, and at the same time, the bevel valve for pressure equalization generally has a high fault frequency. The structural form is not convenient for judging the fault of the bevel valve, and the oxygen will always stay in the gap in the regenerative adsorption tower, which is not conducive to the problem of the adsorption capacity of the next adsorption process. The invention provides a nitrogen making device with uniform Angle valve structure

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