A heat pump system and its control method

Abstract

The invention provides a heat pump system and a control method thereof. The heat pump system comprises a compressor (1), an outdoor heat exchanger (6) and a gas-liquid separator (5); and a bypass branch circuit (11) is connected between the outdoor heat exchanger (6) and the gas-liquid separator (5), a fluoride pump (8), a heating part (9) and a control valve (7) are arranged on the bypass branchcircuit (11), and a refrigerating agent in the outdoor heat exchanger (6) can be introduced into an air suction port of the compressor (1) after passing through the bypass branch circuit (11) and being heated. According to the heat pump system and the control method thereof, when a heat pump is started and the compressor is started, the refrigerating agent can be pumped out from the outdoor heat exchanger, heated and delivered to the air suction port of the compressor through the fluoride pump, the control valve and the heating part, therefore, a refrigerant entering the air suction port of the compressor is a gaseous refrigerant, and the technical problems that when the compressor is started to run under the low-temperature heating work condition, the refrigerant flow is small, and the air suction pressure of the compressor is low are solved.

Description

Technical field [0001] The invention belongs to the technical field of air conditioners, and specifically relates to a heat pump system and a control method thereof. Background technique [0002] At present, the installation and use of various heat pump air-conditioning devices from small to large can be seen everywhere, and the heating demand of units in the northern region is becoming more and more important. However, during low-temperature heating operation, almost all heat pump units will operate under many other conditions. For example, the most common start-up flooding, abnormal four-way valve reversal, slow heating speed, etc. due to low refrigerant flow and low suction pressure at the initial stage of heating start-up operation, and even compressor failure Start-up and other problems, these problems will affect the heating effect and people's comfort, but will greatly shorten the life of the unit. Now manufacturers basically add electric heating belts to the compressor. ...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the heat pump unit in the prior art that the refrigerant flow rate is small and the suction pressure of the compressor is low when the compressor is started and operated at low temperature heating conditions, thereby providing a heat pump System and its control method

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