Gas bearing device for free piston type refrigerating machine

Abstract

The invention discloses a gas bearing device for a free piston type refrigerating machine. The gas bearing device comprises a cylinder, a piston body, an inflation cavity, a flow limiting mechanism and a one-way air inlet mechanism, wherein the air inflation cavity is formed inside the piston body, and a flow limiting mechanism embedded on the outer surface of the piston body communicates with theair inflation cavity; the side, close to the top of the piston body, of the inflatable cavity communicates with a compression cavity formed by the piston body and the air cylinder through the one-wayair inlet mechanism, and the one-way air inlet mechanism comprises a valve seat provided with an air inlet hole, a lift-range self-control reed capable of covering the air inlet hole and a filter element arranged in the air inlet hole; and the two ends of the lift-range self-control reed are fixedly connected to the two sides of the air outlet end of the air inlet hole correspondingly, and the filter element is arranged in the air inlet hole. According to the gas bearing device for the free piston type refrigerating machine, the lift-range self-control reed is arranged, the two ends of the the lift-range self-control reed are fixed, the one-way opening and closing degree of the filter element is limited, the lift-range limiter does not need to be additionally arranged, the filter elementis arranged to promote the operation due to blockage, the device is simple in structure, easy to machine and convenient to maintain, and the service life of the gas bearing device can be prolonged.

Description

technical field [0001] The invention relates to a gas bearing device, in particular to a gas bearing device for a free-piston refrigerator, and belongs to the technical field of fluid circulation equipment. Background technique [0002] The free-piston refrigerator adopts advanced technologies such as linear motor drive, leaf spring support, gap seal, and air pressure drive. motor driven. Therefore, it has the advantages of compact structure, light weight, no oil, less moving parts, high reliability, low noise, low vibration, not easy to wear and easy to adjust the cooling capacity. [0003] Although the free-piston refrigerator has the above advantages, its service life is a major bottleneck restricting its use. The use of gas bearings reduces friction between moving parts and increases the life of free-piston refrigerators. It forms a pressure film between the piston and the cylinder to support the load and reduce the contact friction between them, so that the refrigera...

AI Technical Summary

Problems solved by technology

[0004] The air inlet of the air-filled chamber of the existing gas bearing is controlled by a one-way valve to enter and exit the gas in one direction. Specifically, it is realized by a tongue-shaped valve plate fixed on one side and a lift limiter that controls the opening degree of the valve plate. Obviously, this kind of check valve with a lift limiter increases the complexity of the structure and increases the probability of gas bearing clogging. In the absence of a lift limiter, the opening degree of the valve plate is determined by the valve plate. It is determined by the force of the valve and the stiffness of the valve plate. Because there is no lift limiter, this type of valve plate is prone to fatigue with the increase of service time, and the control accuracy drops significantly.

Moreover, when the gas in the gas bearing contains impurities, it will affect the operating state of the piston, causing problems such as clogging of the air supply hole, reduction of work efficiency and motion accuracy, and shortening the service life of the gas bearing.

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