Heat exchanger for heat pump, and heat pump applying same

Abstract

The invention discloses a heat exchanger for a heat pump. The heat exchanger comprises an auxiliary heat exchange cabin, a buffer cabin and a main heat exchange cabin which are sequentially connected, wherein the main heat exchange cabin comprises a main heat exchange cabin shell, a main heat exchange tube bundle is arranged in the main heat exchange cabin shell, one end of the main heat exchange tube bundle is communicated with the buffer cabin through a first main heat exchange tube plate, and the other end of the main heat exchange tube bundle is communicated with a refrigerant drainage tube through a second main heat exchange tube plate; the auxiliary heat exchange cabin comprises an auxiliary heat exchange cabin shell, a capillary tube bundle is arranged in the auxiliary heat exchange cabin, one end of the capillary tube bundle is communicated with a refrigerant supply tube through a capillary tube liquid distributor, and the other end of the capillary tube bundle is communicated with the buffer cabin through a capillary tube plate; the buffer cabin comprises a buffer cabin shell, the main heat exchange cabin is provided with a main water inlet tube and a main water outlet tube, the auxiliary heat exchange cabin is provided with a water absorption tube connected to the main heat exchange cabin and an auxiliary water outlet tube connected to the main water outlet tube. The invention further discloses a heat pump applying the heat exchanger above. A refrigerant in the main heat exchange tube of the heat pump disclosed by the invention is balanced, and the heat exchange efficiency is high.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a heat pump heat exchanger and a heat pump using the heat exchanger. Background technique [0002] In the existing heat pump heat exchanger, the liquid (air supply) nozzle is directly aligned with the tube sheet of the heat exchange tube in the heat exchanger, and the heat exchange tube is connected through the tube sheet to perform evaporation or condensation. [0003] When the existing heat exchanger is used as an evaporative heat exchanger, the liquid supply nozzle is directly aligned with the tube sheet of the heat exchange tube in the evaporative heat exchanger, and the equivalent cross-sectional area of ​​the heat exchange tube bundle is generally larger than that of the liquid supply The cross-sectional area of ​​the tube. However, in the manufacturing process of the existing heat exchanger, due to the limitation of the process size, the distance between the liquid ...

AI Technical Summary

Problems solved by technology

However, in the manufacturing process of the existing heat exchanger, due to the limitation of the process size, the distance between the liquid supply pipe and the tube sheet is very short, causing the refrigerant liquid to directly hit the tube sheet after entering the evaporative heat exchanger, causing the refrigerant to churn and vortex and collide. generate large amounts of refrigerant foam

In this way, first, the refrigerant liquid enters the heat exchange tube bundle at an uneven flow rate, resulting in unequal temperature at each point in the heat exchanger, which reduces the energy efficiency ratio of the heat exchanger system; second, the refrigerant is divided into liquid parts, gas part and gas-liquid mixing part

Under these two conditions, the liquid part of the refrigerant is evaporated to obtain heat, the gas part will not evaporate again, and the gas-liquid mixed part has a very low evaporation due to flash evaporation, which eventually leads to the heat transfer efficiency of the evaporative heat exchanger being lower than the theoretical situation. very low, even as low as 50%

[0004] In addition, the refrigerant enters the heat exchange tube bundle at an uneven flow rate, and the temperature at each point in the heat exchange tube is uneven. During the evaporation process, it is easy to cause incomplete evaporation and the phenomenon of liquid droplets after evaporation.

The evaporated refrigerant enters the compressor with liquid droplets, which is not allowed by the operating conditions of the compressor and will cause damage to the compressor

[0005] When the existing heat exchanger is used as a condensing heat exchanger, the gas supply nozzle is directly aligned with the tube sheet of the heat exchange tube in the condensing heat exchanger, which will also cause the refrigerant gas to directly hit the tube after entering the condensing heat exchanger plate, causing the refrigerant to churn and vortex, causing the refrigerant gas to enter the heat exchange tube bundle at an uneven flow rate, causing the temperature at each point in the heat exchanger to be unequal, reducing the energy efficiency ratio of the heat exchanger system, and affecting the condensing heat exchanger heat transfer efficiency

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