Screw ring pre-tightening structure for molecular sieve bed assembly of helicopter

Abstract

The invention discloses a screw ring pre-tightening structure for a molecular sieve bed assembly of a helicopter, which comprises a sieve bed cover plate, a screw ring and a tool body. The sieve bed cover plate is mounted on a sieve bed, and the screw ring is in threaded connection with the sieve bed to fix the sieve bed cover plate. A stepped mounting groove is formed in the sieve bed, and an internal thread is arranged on the stepped mounting groove. An external thread is arranged on the screw ring. The sieve bed cover plate is arranged on a step surface of the stepped mounting groove. The screw ring is screwed into the stepped mounting groove through the internal thread and the external thread. In actual use, the structure has the advantages of being high in strength and uniform in stress, meanwhile, the screw ring pre-tightening force can be accurately controlled, torque application is more accurate, and the situation that the screw ring loses efficacy due to the fact that threads of the screw ring are damaged by too large torque can be prevented. The structure is convenient to use in actual use, the assembly efficiency is improved, meanwhile, precise installation of the screw ring is achieved, precise control over the pre-tightening force and loosening force of the screw ring is achieved, and normal work of the molecular sieve bed assembly is guaranteed.

Description

technical field [0001] The invention relates to the technical field of oxygen making equipment, in particular to a spiral ring pretensioning structure used for a helicopter molecular sieve bed assembly. Background technique [0002] At present, although pressure swing adsorption oxygen production technology is also adopted in medical oxygen production and household oxygen production, although the function and principle of oxygen production can meet the demand for oxygen consumption, many performances of its molecular sieve oxygen production system cannot meet the national military standards. Relevant requirements for environmental tests and reliability tests of airborne products (such as molecular sieve oxygen generation systems recorded in helicopters). [0003] The structural design of the molecular sieve bed has a great influence on the performance. The existing technology only makes a simple reaction volume based on the filling volume of the molecular sieve, and does not...

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Problems solved by technology

Moreover, the weight of the molecular sieve is relatively large, which is more than double the weight of the entire molecular sieve bed. Its movement will cause the entire molecular sieve oxygen generation system to vibrate, and the collision and wear between the molecular sieve particles will cause the particle size to become smaller and smaller. , when it is smaller than the pore size of the filter, it will be brought into the oxygen flow channel of the finished product by the flowing air flow, causing airborne personnel to inhale, causing great bodily injury, and the molecular sieve dust mixed into the finished oxygen will also reduce the oxygen concentration of the finished product, affecting the production Oxygen effect, the continuous reduction of molecular sieves reduces the service life of oxygen generators, and also brings huge economic losses

[0004] At present, there is no oxygen generation and supply system installed on helicopters in China, which uses the helicopter's own power supply. Some helicopters use two high-pressure oxygen cylinders and other oxygen supply methods, which have the problems of heavy weight, large volume, and high-voltage danger.

In addition, due to the influence and constraints of regular pressure testing of oxygen cylinders, oxygen filling after use, and the lack of special oxygen-generating equipment in remote areas, the shortcomings of using oxygen cylinders for oxygen supply are prominent

Through research and comparison, technologies such as molecular sieve oxygen generation were introduced into the helicopter, and the equipment composition was optimized according to the design requirements of the "six characteristics", and an oxygen generation and supply system for helicopters was designed to provide safe and reliable delivery to the transported personnel. and helicopter pilots; however, it is very inconvenient for the staff to assemble the molecular sieve bed assembly onboard the helicopter

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