Heat exchanger structure and its assembly method

Abstract

The invention discloses a heat exchanger structure, which comprises fins provided with pipe grooves and flat tubes connected with the fins, and the fins are arranged between the fins and can be sleeved on the outside of the flat tubes and A sheet ring separating two adjacent fins, the sheet ring is composed of low-temperature welding material. The invention also discloses a method for assembling the heat exchanger, which includes the following steps: 1) fixing the flat tube at intervals, 2) sequentially inserting fins and sheet rings into the flat tube at intervals; 3) placing the assembled finished product Put it into a low-temperature furnace, perform low-temperature welding with the aid of flux, weld the fins to the flat tubes, and then connect the flat tubes and headers to complete the assembly of the heat exchanger. The heat exchanger structure of the present invention adopts non-flanged fins, which reduces complex processes such as pre-punching and punching, and reduces the cost of stamping dies; The connection between the sheet and the flat tube adopts low-temperature welding, and the cost is relatively low.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a heat exchanger welding material setting method and an assembly method thereof. Background technique [0002] When the room air conditioner is running in cooling mode, the indoor air flows through the evaporator to reduce the temperature. At the same time, because the temperature of the surface of the evaporator is generally significantly lower than the dew point temperature of the air, when the air flows through the surface of the evaporator, part of the moisture in the air will be precipitated, thereby forming condensed water on the surface of the evaporator. Condensed water on the surface of the evaporator should be drained in time. If the condensed water accumulates on the surface of the evaporator, it will block the air passage, increase the flow resistance of the air, and reduce the efficiency of the evaporator: water droplets may also be blown into the room, resulting in unqualified q...

AI Technical Summary

Problems solved by technology

[0005] However, when the heat transfer requirement is large, the thickness of the tube-fin heat exchanger is limited, and the size of the windward side of the tube-fin heat exchanger is required to be large, resulting in a longer serpentine coil, longer refrigerant circulation channels, and refrigerant flow in the coil. The flow heat exchange in the tube, the length ratio of the formed gas phase area, gas-liquid two-phase area, and liquid phase area is unreasonable. Due to the long process, the liquid phase formed after the refrigerant passes through the gas phase area and the gas-liquid two-phase area is heat exchanged. The area is longer, and the heat transfer efficiency of the liquid phase area with a lower refrigerant temperature is low, resulting in a waste of heat transfer area, and the longer liquid phase area increases the cold resistance, which seriously affects the performance of the heat exchanger

[0006] At the same time, the fins need to be flanged, and the process of stamping fins and flanging is complicated. The connection between the fin flanging and the flat tube is brazed, and it is difficult to set the welding materials for brazing uniformly, which results in high welding costs and the overall The production process is complex, and the welding process is not easy to control and prone to poor welding

Images