Transcritical carbon dioxide heat pump device

Abstract

The invention discloses a transcritical carbon dioxide heat pump device, comprising a compressor, a high-pressure oil separator, a gas cooler, a heat regenerator, a throttling gear, an air cooling evaporator, and a gas-liquid separator connected in a carbon dioxide circulation pipeline in sequence according to a flow direction of carbon dioxide. A hand valve A, a filter A, and a solenoid valve A are connected between the heat regenerator and the throttling gear in sequence through a pipeline. A hand valve B and a filter B are connected between the gas-liquid separator and the compressor in sequence through a pipeline. The device is characterized in that a carbon dioxide outlet pipeline position in the gas-liquid separator is provided with an oil return hole. A solenoid valve B, a capillary tube, a filter C, a hand valve C, an oil storage tank, and an oil level controller are connected between the an oil outlet of the high-pressure oil separator 2 and an oil inlet of the compressor in sequence through a pipeline. The product has functions of low pressure liquid storage, defrosting, and backheating, and operation of a unit in low temperature environment is safer, more reliable, and more efficient.

Description

technical field [0001] The invention belongs to the field of heat pump systems, and in particular relates to a transcritical carbon dioxide heat pump device. Background technique [0002] The destruction of the ozone layer and climate warming are the main environmental problems facing the world. Because the CFC and HCFC refrigerants widely used in refrigeration, air conditioning, heat pump and other industries have problems such as destroying the ozone layer and causing greenhouse effects, coupled with the improvement of people's living standards, the demand for refrigeration, air conditioning, heat pump and other systems in various countries continues to increase. Substitution of refrigerants has become a worldwide concern. [0003] As a natural working substance, carbon dioxide has been paid attention by researchers at home and abroad because of its good environmental performance, no damage to the ozone layer, and small greenhouse effect. In addition, when the carbon dio...

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Problems solved by technology

[0005] In order to solve the problems existing in the existing technology, overcome the single low-pressure low-temperature gas-liquid separator oil return mode of the traditional air-source carbon dioxide heat pump system, and solve the problem of oil shortage in the compressor due to poor oil return fluidity during compressor operation, this paper The invention provides a transcritical carbon dioxide heat pump system with high-pressure oil separation, low-pressure oil return and double oil return. The specific implementation plan is as follows:

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