Free lubrication centrifugal refrigerant compressor and lubricating method thereof

Abstract

The invention discloses a free lubrication centrifugal refrigerant compressor and a lubricating method thereof, which are used for compressing low-pressure refrigerant into high-pressure refrigerant. The free lubrication centrifugal refrigerant compressor comprises a shell, a refrigerant runner, a compression module, a radial bearing, a first guide member, a collection groove and a first discharging member, wherein the compression module is provided with a rotating shaft, a compression member and a drive member, the radial bearing is rotatably sleeved on the rotating shaft, the first guide member is used for guiding lubrication refrigerant fluid into the surface of the radial bearing so as to enable the lubrication refrigerant fluid to provide proper lubricating effect for the radial bearing and the rotating shaft when the drive member drives the rotating shaft to rotate for driving the compression member to compress the low-pressure refrigerant into the high-pressure refrigerant, andthe first discharging member is used for discharging the lubrication refrigerant fluid. Therefore, the problem of pollution generated by using grease lubrication in the traditional compressor can be solved.

Description

technical field [0001] This case involves a centrifugal refrigerant compressor and its lubrication method. More specifically, this case involves an oil-free centrifugal refrigerant compressor that does not use lubricating oil to lubricate the shaft and its lubrication method. Background technique [0002] For a pressurizing device such as a centrifugal compressor, the impeller is driven by the rotating shaft and is matched with components such as a volute, which can work on the fluid while sucking in the fluid (such as refrigerant, air, water, etc.), thereby achieving Efficacy of fluid pressurization and delivery. The key to improving the operating performance of the compressor is how to provide proper lubrication and support for the shaft so that it can rotate stably and quickly. Therefore, various bearing designs have emerged accordingly. [0003] As disclosed in U.S. Patent No. 7240515, the centrifugal compressor is a magnetic bearing type compressor, which suspends the ...

AI Technical Summary

Problems solved by technology

The use of liquid refrigerant as a lubricant can avoid environmental pollution caused by lubricating oil, but since the viscosity of liquid refrigerant is usually not enough for balls, it cannot provide the shaft of a ball bearing compressor as lubricating oil. Good lubricating effect is easy to cause undue wear on the balls and the shaft in the ball bearing compressor, which in turn increases the failure rate of the ball bearing compressor

Secondly, although the buffer layer laid between the rotating shaft and the outer wall of the rotating shaft can reduce the probability of damage to the rotating shaft, the buffer layer will increase the damping coefficient between the rotating shaft and the shaft tube, making the elastic dynamic pressure bearing unsuitable for high-speed compression machine, resulting in greatly reduced practicability

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