Oil surface lifting device of rotary compressor

Abstract

An oil surface lifting device of a rotary compressor. The compressor includes a closed shell, an electrical machine mechanism arranged in the closed shell, a compression mechanism located under the electrical machine mechanism, and an oil tank arranged on the bottom of the closed shell. A reservoir for gas-liquid separation is arranged outside the compressor, and a connecting pipe is connected between the reservoir bottom and the internal oil pool of the compressor. The connecting pipe for oil return is arranged between the reservoir bottom and the oil tank of the compressor, and the connecting pipe is also provided with a control device to control the conducting and closing of the connecting pipe. When the compressor runs, the control unit closes the connecting pipe to ensure the normal operation of the compressor; and when the compressor is in an unsteady shutdown state, the control device opens the connecting pipe; because of the suction-exhaust pressure balance, lubricating oil stored in the reservoir directly returns to the oil tank of the compressor through the connecting pipe, thereby increasing the oil surface level of the oil tank, and improving oil supply capacity of the compressor in starting. The oil surface lifting device has advantages of simple structure and reliable operation.

Description

technical field [0001] The invention relates to a rotary compressor, in particular to an oil level raising device for a rotary compressor. Background technique [0002] R22 refrigerant has been listed as a phase-out refrigerant by the "Montreal Protocol". Europe and Japan have already begun to switch to R410A refrigerant replacement, and the United States will also ban the use of R22 in new refrigeration products in 2010. China has also accelerated the pace of R22 phase-out, which will be frozen at the average level from 2009 to 2010 in 2013, and the requirement of 10% of the baseline level must be reduced in 2015. And some major domestic brands have also begun to launch environmentally friendly air conditioners with R410A as the refrigerant. However, the GWP value of R410A is larger than that of R22. The "Kyoto Protocol" has listed R410A as a greenhouse gas for controlled emissions. All R410A is by no means a long-term alternative. [0003] As an alternative refrigerant ...

AI Technical Summary

Problems solved by technology

[0004] However, the reduction of the amount of lubricating oil inside the compressor will lead to the reduction of the oil level inside the compressor. Although some measures can be taken, such as reducing the lower space to ensure the oil level, due to the reduction of the total oil amount, the system is unstable. For example, when the compressor is stopped and started, or during defrosting, the oil level of the compressor will suddenly drop, which will cause insufficient oil supply to the moving parts, which will affect the reliability of the compressor, and even cause the moving parts to run out of oil in severe cases. Lubrication causes compressor to freeze

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