Double-flow microchannel evaporator with double liquid supply tubes and gas guide thin tube

Abstract

The invention discloses a double-flow microchannel evaporator with double liquid supply tubes and a gas guide thin tube. The double-flow microchannel evaporator comprises a confluence header and a main header which are arranged left and right at intervals, the opposite sides of the confluence header and the main header communicate with each other through a plurality of flat tubes which are transversely distributed, the main header is internally provided with a horizontally distributed flow-separation baffle, the flow-separation baffle is used for dividing the main header into two cavities, namely an inlet header body and an outlet header body, a liquid separation baffle is arranged in the inlet header body, the liquid separation baffle divides the inlet header body into two cavities, namely the upper cavity and the lower cavity, the upper cavity of the inlet header body communicates with the upper liquid supply tube, the lower cavity of the inlet header body communicates with the lowerliquid supply tube, the upper part of the right side of the outlet header body communicates with an exhaust tube through a one-way valve, and the top of the confluence header communicates with the exhaust tube through the gas guide thin tube. According to the double-flow microchannel evaporator with the double liquid supply tubes and the gas guide thin tube, the problem of mutual interference between the gas phase flow and the liquid phase flow in a microchannel can be effectively relieved, the heat exchange effect of the microchannel evaporator is improved, and the heat exchange performanceof the microchannel evaporator is guaranteed.

Description

technical field [0001] The invention relates to the technical field of evaporators, in particular to a double-flow micro-channel evaporator with double liquid supply pipes and thin gas guide pipes. Background technique [0002] At present, the evaporators in the refrigeration system are mostly sleeve-type evaporators, shell-and-tube evaporators, and fin-type evaporators. Disadvantages such as low thermal efficiency. [0003] In contrast to this, the microchannel heat exchanger has been widely used as a condenser, and has the advantages of low overall cost, high efficiency and energy saving, so it has been promoted and applied to the field of air conditioning and refrigeration in recent years. [0004] However, for the microchannel evaporator in the refrigeration system, the gas-liquid two-phase flow in the microchannel interferes with each other, and the vaporized refrigerant easily hinders the flow of the liquid refrigerant, thereby easily affecting the performance of the ...

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to solve the problem of uneven liquid supply in existing dual-flow microchannel evaporators, the accumulation of refrigerant in the lower part of the inlet header and the lower flat tube due to gravity, and the influence of gas-liquid two-phase flow in the microchannel on microchannel evaporation. The heat exchange effect of the device, especially the large amount of gas in the second process, seriously reduces the technical problem of the effective heat exchange area of ​​the second process, and provides a dual-process micro-channel evaporation with dual liquid supply pipes and gas guide tubes The device can improve the uniformity of liquid refrigerant supply, and at the same time, it can increase the flow rate and flow rate of the upper part of the inlet header, thereby improving the flow rate, flow rate and uniformity of the liquid refrigerant in the flat tubes of the first process of the micro-channel evaporator. At the same time, the liquid enters the In the microchannel of the flat tube in the second process, the flow rate of the refrigerant in the second process can be increased, the uniformity of liquid supply in the second process of the refrigerant can be improved, and the heat exchange area of ​​the second process of the microchannel evaporator can be fully utilized. The heat transfer area of ​​the micro-channel evaporator enhances the heat transfer, thereby improving the heat transfer efficiency of the micro-channel evaporator and ensuring the heat transfer performance of the micro-channel evaporator, which is conducive to wide application and has great practical significance in production

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