Shell and tube heat exchanger with liquid storage function and air source heat pump hot water system

The invention relates to the technical field of shell and tube heat exchangers, and discloses a shell and tube heat exchanger with a liquid storage function and an air source heat pump hot water system.The shell and tube heat exchanger comprises a shell and tube heat exchanger body, the shell and tube heat exchanger body comprises an outer barrel, an inner barrel is arranged on the inner side of the outer barrel, and a heat exchange tube located on the outer side of the inner barrel is inserted into the inner side of the outer barrel; according to the shell and tube heat exchanger, the inner barrel with the liquid storage function is used, redundant refrigerants of a refrigerating system are stored in an inner cavity of the inner barrel, namely, the inner cavity of the inner barrel has the function of a liquid storage device, the through hole with the diameter being 5 mm is machined in the lower portion of the inner barrel through a drilling machine, and the inner cavity of the inner barrel communicates with