Evaporator

Abstract

The invention relates to an evaporator, which comprises a heat exchanger pipe group on an entrance side, a heat exchanger pipe group on an exit side and a water chamber. The water chamber comprises an upper water chamber (4a) on the exit side and a lower water chamber (4b) on the exit side, wherein the upper water chamber (4a) and the lower water chamber (4b) are arranged at two ends of the heat exchanger pipe group on the exit side and communicated with the heat exchanger pipe group (1b) on the exit side; a lower water chamber (3b) on the entrance side is communicated with the lower water chamber (4b) on the exit side; an upper water chamber (3a) on the entrance side is communicated with a liquid inlet pipe (10); the upper water chamber (4a) on the exit side is communicated with a liquidoutlet pipe (11); and fins (6) are welded between the heat exchanger pipes. The key point of the evaporator lies in that flow distributing devices capable of uniformly distributing refrigerant mass flow rate are arranged in the water chambers. Because a liquid refrigerant is uniform in the evaporator, the evaporator has a good refrigerating effect. The evaporator has the advantages of convenient manufacturing and assembling and small volume.

Description

technical field [0001] The invention relates to an evaporator used for an air conditioner, in particular to a microtube evaporator applied to an automobile air conditioner. Background technique [0002] Extruded porous microtubes are widely used in compact heat exchangers such as automotive evaporators and condensers. Microtube evaporators, as the main challenger of cascading evaporator technology, have become mainstream in automotive industry applications . However, due to the gravity of the existing evaporator, the introduced two-phase flow will produce stratification, and because the microtube protrudes into the flow channel, the resistance of the flow from the inlet to the far end will increase, and at the same time, the fluid will continue to flow into the microtube along the way. The flow tends to decrease gradually along the water chamber, thus resulting in an uneven mass flow distribution in the water chamber. The inhomogeneity of the mass flow distribution in the ...

AI Technical Summary

Problems solved by technology

However, due to the gravity of the existing evaporator, the introduced two-phase flow will produce stratification, and because the microtube protrudes into the flow channel, the resistance of the flow from the inlet to the far end will increase, and at the same time, the fluid will continue to flow into the microtube along the way. The flow tends to decrease gradually along the water chamber, so the mass flow distribution in the water chamber is uneven

Inhomogeneity of mass flow distribution in the water chamber is the main reason for the performance degradation of the microtube evaporator

To solve this technical problem, add a refrigerant distribution device in the water chamber to make the refrigerant evenly distributed along the longitudinal direction of the water chamber; or add several partitions in the water chamber to form multiple flow channels, thus dividing the water chamber into several An independently closed water chamber section, because the length of the water chamber section and the number of microtubes in a single flow channel is only a part of the entire water chamber and the number of tubes, the unevenness of the flow can be significantly improved by adding flow channels , but this design makes the performance of the evaporator poor under the same core thickness, and in order to reduce the pressure drop loss, the microtube needs to be thicker and wider. At the same time, because the size of the core and the microtube is relatively large, the air Higher lateral pressure drop

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