Heat pump type air-conditioning heat exchanger with heat exchange working medium flow direction and flow path number in synchronous change

Abstract

The invention discloses a heat pump type air-conditioning heat exchanger with a heat exchange working medium flow direction and a flow path number in synchronous change. The heat pump type air-conditioning heat exchanger comprises a heat exchanger with 2n flow paths, first and second branch pipes at a leeward side, first and second branch pipes at a windward side, a header pipe at the leeward side and a header pipe at the windward side, wherein the header pipe at the leeward side is separately connected with the first branch pipe and the second branch pipe at the leeward side; the header pipe at the windward side is separately connected with the first branch pipe and the second branch pipe at the windward side; the branch pipes at the leeward side and the branch pipes the windward side are correspondingly arranged, and are separately connected with end openings at the leeward side and the windward side of the n flow paths in the heat exchanger; the second branch pipe at the leeward side and the first branch pipe at the windward side are provided with one-way valves; the inlet end of the one-way valve of the second branch pipe at the leeward side and the outlet end of the one-way valve of the first branch pipe at the windward side are connected through a pipeline to form a refrigerating branch pipe; and the refrigerating branch pipe is provided with an electronic valve. The number of the flow paths of the heat exchanger is changed with the switching of a refrigerating working condition and a heating working condition while the flow direction of the heat exchange working medium is changed with the switching of the working condition, so that the performances of an air conditioner are optimal.

Description

technical field [0001] The invention relates to a technology in the field of air conditioning, in particular to a heat pump type air conditioner heat exchanger in which the flow direction of heat exchange working fluid and the number of flow paths change synchronously with the change of working conditions. Background technique [0002] The heat pump air conditioner has two working conditions of cooling and heating. When the working conditions are switched, the heat exchanger in the air conditioner is also switched from "evaporator" to "condenser" and "condenser" to "evaporator". change. Taking the outdoor unit as an example, the outdoor unit acts as a "condenser" under cooling conditions, and switches to an "evaporator" under heating conditions. However, in this technology, the optimal number of flow paths between the evaporator and the condenser is different, so that the performance of the heat exchanger with a fixed number of flow paths cannot be optimized under both cool...

AI Technical Summary

Problems solved by technology

When this technology is applied to the condenser, the refrigerant first divides into two branches and flows into the heat exchanger, and then merges into one flow path to flow out of the heat exchanger; the number of heat exchange tubes in the combined flow path accounts for One-third, the flow path is long and the refrigerant flow rate is high, resulting in a sharp increase in the pressure drop of the two-phase refrigerant in the combined flow path, which reduces the heat transfer performance; at the same time, the three electronic expansion valves in this technology require complex electrical Signal control, high cost, unstable control

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