Variable-flow multi-cycle heat pump system

Abstract

The invention discloses a variable-flow multi-cycle heat pump system, and aims at providing a system which is simple in structure and low in cost. The variable-flow multi-cycle heat pump system comprises a refrigerating compressor unit, a three-way valve, a heat exchanger, an indoor unit, an outdoor unit, a first throttle valve and a second throttle valve; the refrigerating compressor unit comprises multiple compressors and four-way reversing valves of which the number is the same as that of the compressors, and each compressor and the corresponding four-way reversing valve form a compressingunit; in each compressing unit, the exhaust end of the compressor is connected with a first port of the corresponding four-way reversing valve, and the suction end of the compressor is connected witha third port of the corresponding four-way reversing valve; and in each compressing unit, second ports of the four-way reversing valves are connected in parallel and then divided into second ports andthird ports of the refrigerating compressor unit, and fourth ports of the four-way reversing valves are connected in parallel and then divided into first ports and fourth ports of the refrigerating compressor unit. The system is simple in structure and flexible and convenient to switch.

Description

technical field [0001] The invention relates to the technical field of heat pumps, and more specifically relates to a heat pump system capable of realizing single-stage parallel connection of variable flow, double-stage compression and cascade cycle. Background technique [0002] With the increasing pressure of environmental protection, the country vigorously promotes coal-to-electricity products. Air source heat pumps are widely used due to their energy saving and environmental protection features. [0003] For heating in winter, a single-stage compression heat pump cycle is usually used. The single-stage compression heat pump cycle system is simple and low in cost. However, when the difference between the condensing temperature and the evaporating temperature is large, the pressure difference between the condensing pressure and the evaporating pressure is also large, and one-time throttling can no longer satisfy the working conditions with a large pressure difference. For...

AI Technical Summary

Problems solved by technology

At present, the corresponding refrigeration cycle method is generally adopted according to the main needs, which cannot be changed according to the change of working conditions, and the operating cost is high and the temperature fluctuates greatly.

Especially for the comparative experiments of the experimental system, they are designed separately, and the experimental results are affected by the system composition.

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