Air source heat pump system

By using a shell and tube heat exchanger and a liquid separation device in the air source heat pump system, combined with a four-way valve and a one-way valve, the problems of liquid refrigerant backflow and low suction pressure are solved, and the operating efficiency and reliability of the system are improved. , achieving efficient operation in cooling mode.

CN110274408AInactive Publication Date: 2019-09-24SHANGHAI COMER MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI COMER MACHINERY
Filing Date
2018-11-22
Publication Date
2019-09-24
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the existing air source heat pump system, the liquid refrigerant flows back to the compressor after the defrost mode ends, and the suction pressure is low in the cooling mode, resulting in poor system efficiency and high cost.

Method used

Design an air source heat pump system that uses a shell-and-tube heat exchanger as the heat exchanger and gas-liquid separator in cooling and heating mode, combined with a four-way valve, a one-way valve and a liquid separation device to ensure that the refrigerant does not flow out after defrosting. Return the compressor and avoid suction superheat in cooling mode to improve suction pressure and efficiency.

Benefits of technology

This achieves cost savings without adding a liquid refrigerant reservoir, avoids the backflow of liquid refrigerant, and improves the operating efficiency and system reliability of the refrigeration mode.

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Abstract

The invention provides an air source heat pump system. The air source heat pump system comprises a compressor, a fin heat exchanger, a shell tube heat exchanger and a gas-liquid separator, wherein the shell tube heat exchanger comprises a gas tube, a liquid tube, a heat exchange tube and a liquid separating device, the air source heat pump system further comprises a four-way valve, the four-way valve is correspondingly communication with the compressor, the gas-liquid separator, the fin heat exchanger and the gas pipe, the fin heat exchanger is in communication with the liquid separating device through a orifice plate and a first one-way valve; the fin heat exchanger is in communication with the liquid tube through an expansion valve and a second one-way valve; the first one-way valve is used for the one-way conduction of the fin heat exchanger to the liquid separating device; the second one-way valve is used for the one-way conduction of the liquid pipe to the fin heat exchanger. By the adoption of the system, a liquid storage device of the liquid refrigerant does not need to be added in the system, so that the cost is saved; a large amount of liquid refrigerant cannot flow back to the compressor after defrosting is finished; during the refrigeration mode, the refrigerant running shell pass does not need to be subjected to suction superheat, so that the air suction pressure and the operation efficiency of the refrigeration mode are improved; and the overall use valve of the system is less, and the reliability is high.
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