Heat source tower heat pump air conditioning unit with ice storage function

Abstract

The invention discloses a heat source tower and heat pump air-conditioning unit with an ice storage function. The heat source tower and heat pump air-conditioning unit comprises a heat source tower, a heat pump host and a control system; the heat pump host comprises a compressor, a secondary oil separator, a condenser, a dry filter, an electronic expansion valve and an evaporator which are connected in sequence and form a loop; the evaporator comprises a refrigeration heat exchanger and an ice storage heat exchanger; the compressor and the secondary oil separator are connected through a primary oil return line; the primary oil return line is provided with an oil filter used for impurity filtration; moreover, a secondary oil return line is arranged, and the secondary oil return line is provided with an injection pump; the heat pump host is controlled by the control system to run under alternative of a refrigeration working condition, an ice storage working condition and a heating working condition. According to the heat source tower and heat pump air-conditioning unit disclosed by the invention, the traditional heat source tower and heat pump air-conditioning unit can have the ice storage function, and therefore ice storage is performed by fully utilizing summer urban valley electricity, and the operating cost is greatly reduced; moreover, oil return from the evaporator to the compressor is realized, so that the goal that the whole system can run stably and reliably is achieved.

Description

technical field [0001] The invention relates to the technical field of air conditioning units, in particular to a heat source tower heat pump air conditioning unit with ice storage function. Background technique [0002] The heat source tower heat pump air conditioning unit is a combined supporting equipment device that absorbs the heat in the outdoor air to provide heat for the system in winter, and discharges the heat of the system to the outside in summer. The heat source tower heat pump air conditioning unit is mainly composed of a heat source tower, a heat pump (small temperature difference water source heat pump) and a defrosting machine. The heat pump is mainly composed of an evaporator, a compressor, an expansion valve, a secondary oil separator, and a condenser. The working fluid circulates in the five parts in turn, constantly changing its state, and completing heat absorption and heat release. In summer, the heat source tower uses evaporative cooling to provide a...

AI Technical Summary

Problems solved by technology

However, despite the use of a secondary oil separator with an efficiency of 99.9%, 0.1% of the compressor lubricating oil passes from the secondary oil separator into the downstream condenser, and then into the evaporator, the evaporator shell What flows is a mixture of refrigerant and compressor refrigeration oil. During the process of evaporating the liquid refrigerant into gas, only a small part of the refrigerant oil returns to the compressor with the gas refrigerant to participate in the cycle, while most of the refrigerant oil will accumulated in the evaporator

A large amount of refrigerating oil accumulates in the evaporator shell, which will not only make the compressor unable to work normally due to lack of refrigerating oil, but also affect the evaporation efficiency of the refrigerant in the evaporator

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