Bidirectional auto-cascade heat pump system

Abstract

The invention relates to a bidirectional auto-cascade heat pump system, and belongs to the technical field of heating. The bidirectional auto-cascade heat pump system comprises a compressor, an indoorheat exchanger, a rectification column, a first heat regenerator, a second heat regenerator, an auxiliary throttle device, a main throttle device, an outdoor heat exchanger, a first four-way valve and a second four-way valve. Through the combination of the ports of the double four-way valves in a communication state, the compressor, the indoor heat exchanger, the rectification column, the first heat regenerator, the second heat regenerator, the auxiliary throttle device, the main throttle device and the outdoor heat exchanger are combined into a heating loop and a defrosting loop which are anauto-cascade flow path separately, so that defrosting can be carried out when the running efficiency of the system is influenced due to frosting of the outdoor heat exchanger; moreover, heating witha high temperature difference of greater than 75 DEG C can be realized; and the bidirectional auto-cascade heat pump system can be widely applied to the technical field of heating.

Description

technical field [0001] The invention relates to the technical field of heating systems, in particular to a bidirectional self-cascading heat pump system. Background technique [0002] The traditional heating method that consumes coal resources for heating has caused people's concerns because of its high pollution, low efficiency, and non-renewable problems. One of the feasible ways to solve these problems is to fully use air source heat pump technology to replace traditional technology for heating, although Air source heat pump technology has made rapid progress, but heat pump equipment is still dominated by low-temperature heat pumps, usually with an output temperature lower than 55°C. [0003] In the process of using heat pump technology to transform the coal-fired heating system, in order to match the indoor terminal equipment in the original heating system, hot water at a higher temperature must be output, but the commonly used vapor compression air source heat pump is a...

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Problems solved by technology

[0002] The traditional heating method that consumes coal resources for heating has caused people's concerns because of its high pollution, low efficiency, and non-renewable problems. One of the feasible ways to solve these problems is to fully use air source heat pump technology to replace traditional technology for heating, although Air source heat pump technology has made rapid progress, but heat pump equipment is still dominated by low-temperature heat pumps, usually with an output temperature lower than 55°C

[0003] In the process of using heat pump technology to transform the coal-fired heating system, in order to match the indoor terminal equipment in the original heating system, hot water at a higher temperature must be output, but the commonly used vapor compression air source heat pump is applied to cold There will be the following defects in the area: heating capacity decay, heating efficiency reduction, compressor exhaust temperature rises, resulting in heat pump inoperability or reduced operation reliability, low air temperature, which seriously affects the comfort of the indoor environment

However, due to its operation based on non-azeotropic mixed working fluid, there are steps such as gas-liquid separation in the intermediate heat exchange process, and the simple reverse operation like ordinary heat pump air conditioners cannot be realized. serious adverse consequences

Since the outdoor heat exchanger is responsible for heat absorption and heat exchange, the heat exchange performance will be seriously reduced under frosting conditions, which will lead to deterioration of the performance and operating conditions of the heat pump, which is not conducive to the long-term use of the heat pump. Therefore, self-cascading heat pumps usually require Another set of electric defrosting equipment is added, which not only consumes a lot of energy for defrosting, but also has poor effect

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