Carbon dioxide internal heat exchanger and carbon dioxide heat pump circulation system

An internal heat exchanger, carbon dioxide technology, used in refrigeration and liquefaction, lighting and heating equipment, refrigeration components, etc., can solve the problems affecting the application of carbon dioxide heat pump air conditioners, insufficient gas-liquid separation, difficult to achieve oil return, etc. The effect of cruising range, reducing energy consumption and improving cooling performance

CN113405271APending Publication Date: 2021-09-17HANGZHOU YICHAO NEW ENERGY AUTOMOBILE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-09-17

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Abstract

The invention discloses a carbon dioxide internal heat exchanger and a carbon dioxide heat pump circulating system. The carbon dioxide internal heat exchanger comprises a shell, a heat insulation pipe, a barrel, a first pipeline, a second pipeline and a gas-liquid separation and oil return assembly; the shell comprises an outer pipe, an upper end cover and a lower end cover, the upper end cover is provided with a low-pressure inlet and a high-pressure outlet, and the lower end cover is provided with a high-pressure inlet and a low-pressure outlet; the heat insulation pipe is arranged in the shell; the barrel is arranged in the shell, and a spiral groove is formed in the cylindrical surface of the outer contour of the barrel; the first pipeline is arranged in the barrel, the top end of the first pipeline is connected with the low-pressure inlet, and the bottom end of the first pipeline is located at the position about 1 / 6 of the upper portion of the barrel; the second pipeline is spirally wound on the barrel, and the two ends of the second pipeline are connected between the high-pressure outlet and the high-pressure inlet; and the gas-liquid separation and oil return assembly is arranged in the barrel, gas-liquid separation is realized under the action of gravity, separated liquid drops drop on an oil storage chamber on the inner surface of the barrel, and gas flows through the oil storage chamber to realize oil return.
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Description

technical field

[0001] The invention belongs to the field of automobile heat exchangers and gas-liquid separators, in particular to a carbon dioxide internal heat exchanger and a carbon dioxide heat pump circulation system. Background technique

[0002] In recent decades, the rising trend of global temperature has obviously intensified, among which vehicle emissions and leakage of air-conditioning refrigerants have contributed to global warming.

[0003] As the world accelerates the development of new energy vehicles, the problem of refrigerant leakage needs to be solved urgently. At present, the refrigerant used in vehicle air conditioners is generally R134a, but its unique molecular structure will increase the greenhouse effect. Therefore, CO 2 As an alternative refrigeration, it has entered the sight of refrigeration researchers in various countries.

[0004] However, the use of carbon dioxide as an air-conditioning system has major defects, such as low cooling efficie...

Examples

Embodiment Construction

[0033] The present invention will be further explained and described in conjunction with the accompanying drawings and specific embodiments below. However, the explanation and illustration do not limit the technical solution of the present invention.

[0034] Such as figure 1 As shown, a carbon dioxide heat pump circulation system of the present invention includes a carbon dioxide internal heat exchanger 1 , an expansion valve 2 , an evaporator 3 , a compressor 4 , and a gas cooler 5 . In this embodiment, when the carbon dioxide heat pump cycle system is working, the high-temperature and high-pressure gas from the compressor 4 is first cooled by the gas cooler 5, and then enters the carbon dioxide internal heat exchanger 1, where heat exchange is performed in the carbon dioxide internal heat exchanger 1 Outflow, through the expansion valve 2 to achieve throttling, the throttled low-temperature and low-pressure gas-liquid enters the evaporator 3 to evaporate, forming a low-temp...