Heat recovery air-cooled heat pump cold and hot water machine and oil return control method thereof

Abstract

The invention provides an oil return control method of a heat recovery air-cooled heat pump cold and hot water machine. The heat recovery air-cooled heat pump cold and hot water machine comprises a hot water side heat exchanger, an air side heat exchanger, an air conditioner side heat exchanger and a compressor. The oil return control method includes the following steps that whether the heat recovery air-cooled heat pump cold and hot water machine meets the oil return condition or not is judged; if it is judged that the heat recovery air-cooled heat pump cold and hot water machine meets the oil return condition, the current operating mode of the heat recovery air-cooled heat pump cold and hot water machine is acquired; the heat recovery air-cooled heat pump cold and hot water machine is controlled to execute oil return actions according to the current operating mode of the heat recovery air-cooled heat pump cold and hot water machine. The oil return control method can accurately and efficiently control refrigerant oil in a unit, it is guaranteed that the compressor is always in a safe lubricating state, and it is guaranteed that the unit is safely and reliably operated. The invention further discloses the heat recovery air-cooled heat pump cold and hot water machine.

Description

technical field [0001] The invention relates to the technical field of heat pump water heaters, in particular to an oil return control method of a heat recovery air-cooled heat pump water heater and a heat recovery air-cooled heat pump water heater. Background technique [0002] With the improvement of people's living standards, the heat recovery module unit has gradually become the first choice of the customer's air conditioning module unit because of its energy saving, environmental protection, comfort and other characteristics. The full heat recovery air-cooled heat pump cold (hot) water machine includes four main operating modes, namely cooling mode, heating mode, heat recovery mode, and heat pump hot water mode, which can ensure that air conditioning and hot water can be satisfied throughout the year. The centralization of functions will lead to relatively complex control logic for the two aspects of domestic hot water. [0003] Since the full heat recovery air-cooled ...

AI Technical Summary

Problems solved by technology

The full heat recovery air-cooled heat pump cold (hot) water machine includes four main operating modes, namely cooling mode, heating mode, heat recovery mode, and heat pump hot water mode, which can ensure that air conditioning and hot water can be satisfied throughout the year. Requirements for both domestic hot water and centralization of functions will lead to relatively complex control logic

[0003] Since the full heat recovery air-cooled heat pump cold (hot) water machine is composed of three heat exchangers, one of the heat exchangers will always be in an idle state during operation, so if one mode of operation is maintained for a long time, it will lead to the deposition of refrigerated oil in the system In the wheel heat exchanger, it will cause the system (compressor) to lack oil, which can lead to a series of problems such as compressor wear, cylinder sticking, overheating and demagnetization

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