Oil pump and control method thereof

Abstract

The invention discloses an oil pump and a control method thereof. The oil pump comprises a compressor, a water tank heat exchanger, a flash evaporator and an evaporator which are sequentially connected in series to form a loop, the flash evaporator is provided with a liquid inlet, an air supplementing outlet and a liquid outlet, the liquid inlet is connected with the water tank heat exchanger, theliquid outlet is connected with the evaporator; and the compressor is provided with an air supplementing inlet, the air supplementing inlet is connected with the air supplementing outlet through an enthalpy increasing pipe, an oil supplementing outlet is formed in the lower end of the side wall of the flash evaporator, and the oil supplementing outlet is connected with the air supplementing inletthrough an oil return pipe. According to the oil pump and the control method thereof, due to the fact that the pressure in the flash evaporator is higher than the pressure in the compressor, in the presence of the pressure difference between the flash evaporator and the compressor, oil in the flash evaporator can sequentially pass through the oil return pipe and the air supplementing inlet and then enter the compressor to supplement oil to the compressor, so that the oil shortage phenomenon of the compressor during operation in a low-water-temperature environment is avoided.

Description

technical field [0001] The invention relates to the technical field of oil pumps, in particular to an oil pump and a control method thereof. Background technique [0002] With the increasing awareness of environmental protection in the society, the disadvantages of central heating by boilers in the past have become more and more obvious. Coal-to-electricity has developed rapidly in recent years. It has won the favor of the people, and the oil pump heater is the main force of coal-to-electricity transformation, and the reliability design of its system is the top priority of air-conditioning manufacturers. [0003] For the oil pump system, the unit operates at low water temperature, the system refrigerant circulation is small, the flow rate is slow, and the return air carries liquid and other factors, all of which will cause the compressor to lack oil, which will lead to abnormal operation of the system, and even the compressor burns out. On the one hand, it affects Unit reli...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an oil pump and its control method aiming at solving the problem that the compressor is prone to lack of oil when the existing oil pump system operates at low water temperature.

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