Air conditioner

Abstract

The invention discloses an air conditioner, comprising a throttling device. The throttling device is provided with a cooling capillary tube and a heating capillary tube, the heating capillary tube is parallelly connected with a one-way valve and then serially connected with the cooling capillary tube, the direction of the one-way valve is the same with the flow direction of the refrigerant in the cooling capillary tube; the throttling device also comprises at least one auxiliary heating throttling branch which is provided with an auxiliary heating capillary tube and a controllable valve connected with each other in parallel; the heating capillary tube is serially connected with the auxiliary heating capillary tube branch and then parallelly connected with the one-way valve. By adopting the invention, the air conditioner can improve the low temperature heating performance under the prerequisite of satisfying the cooling and heating performance of the air conditioner at the same time.

Description

technical field [0001] The invention relates to an air conditioner, in particular to an air conditioner capable of improving low-temperature heating performance, and belongs to the technical field of air conditioners. Background technique [0002] The low-temperature heating performance of air conditioners is one of the important indicators of heating and cooling air conditioners, and it is also one of the difficulties. When the outdoor temperature is very low, the difference between the evaporating temperature and the outdoor temperature is small, and the heat transfer performance of the evaporator becomes poor. In this case, although the double pressure of the condensing pressure and the evaporating pressure (that is, the ratio of the condensing pressure to the evaporating pressure) is large, the condensing pressure is relatively low, the condensing temperature is low, and the temperature difference with the room is small. The performance is also relatively poor. As a re...

AI Technical Summary

Problems solved by technology

However, for heating and cooling air conditioners using capillary fixed throttling, both cooling and heating performances need to be met, and the improvement of condensing pressure is limited by performance parameters such as cooling capacity, energy efficiency ratio, maximum operating cooling, and maximum operating heating.

Therefore, the capillary cannot be made too long in order to increase the condensation pressure

When the outdoor temperature of the inverter air conditioner is below zero, the heating capacity can reach more than 80% of the rated heat output, while the fixed-frequency air conditioner with capillary fixed throttling generally only has about 45% of the rated heat output. The major domestic brands on the market There are complaints about the poor heating effect of the air conditioners

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