Heat exchanger

The invention discloses a heat exchanger which comprises an evaporation chamber. The input end of the evaporation chamber is in sealing connection with a gas pre-cooling chamber, and one half of compressed air inlet pipe is arranged in the gas pre-cooling chamber. Meanwhile, one end of the compressed air inlet pipe is connected with one input end opening of the evaporation chamber, the other end opening of the compressed air inlet pipe is formed in the bottom of the gas pre-cooling chamber, and a liquid pre-cooling chamber is arranged on the outer surface of the other half of compressed air inlet pipe. A cold air outlet is formed in one end of the gas pre-cooling chamber, and meanwhile an energy-storage piece is arranged in the gas pre-cooling chamber. The input end of the evaporation chamber is in sealing connection with the gas pre-cooling chamber, and one end, connected with the evaporation chamber, of the compressed air inlet pipe is arranged in the gas pre-cooling chamber, so that pre-cooling of compressed air output by a compressor is achieved, pre-cooling and evaporating integration is also achieved, and the occupied space of equipment is reduced.