Efficient and compact capillary tube heat exchanger

The invention discloses an efficient and compact capillary tube heat exchanger. The heat exchanger comprises a barrel body, first-stage capillary tubes, second-stage collecting tubes and third-stagering tubes, wherein the first-stage capillary tubes are connected with the second-stage collecting tubes through brazing, and the second-stage collecting tubes are converged into the third-stage ringtubes; and a heat exchange tube pass adopts three-stage tube bundles and is finally converged into an inlet tube and an outlet tube. According to the novel, compact and efficient capillary tube heat exchanger, the heat exchange efficiency of the heat exchanger is greatly improved, the heat exchange coefficient is large under the same working condition, and the same heat can be exchanged with a small heat exchange area needed; the structure of the heat exchanger is compact, and thus the size and the weight of the heat exchanger are greatly reduced; meanwhile, due to the novel tube distributionmode, the lengths of the cap